oss-301_2014-01

OFFSHORE SERVICE SPECIFICATION

DET NORSKE VERITAS AS

The electronic pdf version of this document found through http://www.dnv.com is the officially binding version

DNV-OSS-301

Verification and Certification of Submarine Pipelines

JANUARY 2014

© Det Norske Veritas AS January 2014

Any comments may be sent by e-mail to [email protected]

This service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this document, and is believed to reflect the best ofcontemporary technology. The use of this document by others than DNV is at the user's sole risk. DNV does not accept any liability or responsibility for loss or damages resulting fromany use of this document.

FOREWORD

DNV is a global provider of knowledge for managing risk. Today, safe and responsible business conduct is both a licenseto operate and a competitive advantage. Our core competence is to identify, assess, and advise on risk management. Fromour leading position in certification, classification, verification, and training, we develop and apply standards and bestpractices. This helps our customers safely and responsibly improve their business performance. DNV is an independentorganisation with dedicated risk professionals in more than 100 countries, with the purpose of safeguarding life, propertyand the environment.

DNV service documents consist of among others the following types of documents:

— Service Specifications. Procedural requirements.

— Standards. Technical requirements.

— Recommended Practices. Guidance.

The Standards and Recommended Practices are offered within the following areas:

A) Qualification, Quality and Safety Methodology

B) Materials Technology

C) Structures

D) Systems

E) Special Facilities

F) Pipelines and Risers

G) Asset Operation

H) Marine Operations

J) Cleaner Energy

O) Subsea Systems

U) Unconventional Oil & Gas


Offshore Service Specification DNV-OSS-301, January 2014

CHANGES – CURRENT –

CHANGES – CURRENT

General

This document supersedes DNV-OSS-301, October 2000.

Text affected by the main changes in this edition is highlighted in red colour. However, if the changes involve

Det Norske Veritas AS, company registration number 945 748 931, has on 27th November 2013 changed itsname to DNV GL AS. For further information, see www.dnvgl.com. Any reference in this document to“Det Norske Veritas AS” or “DNV” shall therefore also be a reference to “DNV GL AS”.

a whole chapter, section or sub-section, normally only the title will be in red colour.

Main changes January 2014

• General

This document has been totally revised with focus on scope for verification and requirements for certificationduring fabrication and operation. In addition the following have been done:

— Alignment with DNV-OSS-300 and last edition of DNV-OS-F101.— Implementation of “Code Manager” for experience recording and future updates.

In addition to the above stated main changes, editorial corrections may have been made.

Editorial corrections



Contents –

CONTENTS

CHANGES – CURRENT ................................................................................................................... 3

1 Introduction ............................................................................................................................... 6

1.1 General............................................................................................................................................................ 6

1.1.1 Introduction ........................................................................................................................................ 61.1.2 Objectives........................................................................................................................................... 61.1.3 Verification service ........................................................................................................................... 61.1.4 Certification service .......................................................................................................................... 61.1.5 Structure of this document ................................................................................................................. 7

1.2 Definitions....................................................................................................................................................... 7

1.2.1 General ............................................................................................................................................... 71.2.2 Verbal forms....................................................................................................................................... 71.2.3 Definitions.......................................................................................................................................... 7

1.3 References....................................................................................................................................................... 9

2 Principles of Risk-Differentiated verification....................................................................... 10

2.1 General.......................................................................................................................................................... 10

2.1.1 Objectives......................................................................................................................................... 10

2.2 Verification principles ................................................................................................................................. 10

2.2.1 Purpose of verification ..................................................................................................................... 102.2.2 Verification as a complementary activity ........................................................................................ 102.2.3 Verification management ................................................................................................................. 102.2.4 Risk-differentiated levels of verification involvement .................................................................... 10

2.3 Selection of level of verification involvement ............................................................................................ 12

2.3.1 Selection factors ............................................................................................................................... 122.3.2 Overall safety objective.................................................................................................................... 122.3.3 Risk assessment................................................................................................................................ 122.3.4 Technical innovation and contractor experience.............................................................................. 132.3.5 Quality management systems........................................................................................................... 13

2.4 Defining a verification plan / scope of work.............................................................................................. 13

2.4.1 Risk based verification planning ...................................................................................................... 13

2.5 Information flow .......................................................................................................................................... 14

2.5.1 Communication lines ....................................................................................................................... 142.5.2 Obligations ....................................................................................................................................... 142.5.3 Notification of level of verification involvement............................................................................. 15

3 Verification activities .............................................................................................................. 16

3.1 General.......................................................................................................................................................... 16

3.1.1 Objectives......................................................................................................................................... 163.1.2 Scope of work .................................................................................................................................. 16

3.2 Project phases............................................................................................................................................... 16

3.2.1 General principles ............................................................................................................................ 16

3.3 Project initiation .......................................................................................................................................... 16

3.3.1 Verification during conceptual design ............................................................................................. 16

3.4 Project realisation ........................................................................................................................................ 17

3.4.1 General ............................................................................................................................................. 173.4.2 Verification of overall project management .................................................................................... 173.4.3 Verification during design................................................................................................................ 173.4.4 Verification during construction ...................................................................................................... 18

3.5 Operation...................................................................................................................................................... 21

3.5.1 Verification during operation........................................................................................................... 21

4 Verification service requirements .......................................................................................... 23

4.1 General.......................................................................................................................................................... 23


4.2 Verification service documents................................................................................................................... 23

4.2.1 General ............................................................................................................................................. 234.2.2 Statement of conformity................................................................................................................... 234.2.3 Verification report ............................................................................................................................ 244.2.4 Intermediate documents ................................................................................................................... 24



Contents –

5 Certification service requirements......................................................................................... 25

5.1 General.......................................................................................................................................................... 25


5.2 Certification service documents ................................................................................................................. 25

5.2.1 General ............................................................................................................................................. 255.2.2 Certificate of conformity.................................................................................................................. 265.2.3 Statement of conformity................................................................................................................... 275.2.4 Verification report ............................................................................................................................ 275.2.5 Intermediate documents ................................................................................................................... 27

5.3 Retention of pipeline certificate.................................................................................................................. 27

5.3.1 General ............................................................................................................................................. 275.3.2 Certificate of conformity with maintenance conditions................................................................... 275.3.3 Requirements for pipeline certificate retention................................................................................ 28

App. A Guideline on selection of verification involvement level based on simplified verification planning...................................................................................................... 29

A.1 General ............................................................................................................................................ 29A.2 Trigger Questions............................................................................................................................ 29

App. B Generic description of project sub-phases................................................................... 31

B.1 General ............................................................................................................................................ 31B.2 Initial studies ................................................................................................................................... 31B.3 Design ............................................................................................................................................. 31B.4 Other phases .................................................................................................................................... 32

App. C Examples of verification and certification documents ............................................... 33

C.1 General ............................................................................................................................................ 33

App. D Detailed scope of work tables for verification and certification ................................ 40

D.1 General ............................................................................................................................................ 40D.2 Description of terms used in the scope of work tables.................................................................... 40D.3 Overall project management ........................................................................................................... 41D.4 Design ............................................................................................................................................. 42D.5 Construction .................................................................................................................................... 47D.6 Operation......................................................................................................................................... 63

CHANGES – HISTORIC ................................................................................................................. 67



Sec.1 Introduction –

SECTION 1 INTRODUCTION

1.1 General

1.1.1 Introduction

1.1.1.1 This DNV Offshore Service Specification (DNV-OSS-301) describes the DNV verification service forsubmarine pipelines and defines the additional requirements for obtaining and retaining a DNV pipeline systemCertificate of Conformity.

1.1.1.2 This OSS falls under the top level document DNV-OSS-300 Risk Based Verification and applies risk-differentiated levels of verification involvement.

1.1.1.3 This OSS identifies and describes verification activities for a pipeline system during design,construction and operation.

1.1.1.4 This OSS is tailor-made for verification and certification of pipeline systems designed and constructedin accordance with DNV-OS-F101.

1.1.1.5 The identified and described verification activities in this OSS are generic. Based on the scope of worktables in Sec.3, the detailed verification scope of work tables in App.D should be subject to project specifictailoring based on risk assessments.

1.1.2 Objectives

1.1.2.1 The objectives of this document are to:

— describe DNV’s verification and certification services for submarine pipeline systems— describe DNV’s approach to risk differentiated levels of verification involvement— provide guidance for the selection of the level of DNV verification involvement— provide guidance on how to establish a verification plan— provide a common communication platform for describing the extent of verification activities required for

DNV certification of submarine pipelines.

1.1.3 Verification service

1.1.3.1 The objective for the verification service is generally the verification of the pipeline integrity. Otheraspects, such as the verification of the environmental impact of the pipeline system, or its suitability withrespect to flow capacity and flow assurance, may be included in DNV’s scope of work, if desired by thecustomer.

1.1.3.2 The verification service is described in Sec.4. Scope of work definition based on risk-differentiatedlevel of verification involvement is described in Sec.2. Sec.3 describes different project phases and givesgeneric scope of work tables.

1.1.3.3 For verification services the customer may stipulate the verification scope of work and the level ofverification involvement to be applied. The selection of the level of verification involvement should be basedon a risk assessment. The verification scope of work may impact the type of DNV deliverables.

1.1.3.4 For verification services this OSS may be adopted for the verification of parts of a pipeline system and/or selected project phases.

1.1.3.5 For verification to other technical standards than DNV-OS-F101 or to customer’s specifications, thisOSS may still be used as a communication platform and as a starting point for preparation of project specificscope of work tables.

1.1.4 Certification service

1.1.4.1 The objective for the certification service is the verification of the pipeline integrity.

1.1.4.2 For certification services this OSS identifies and describes the verification activities required to obtaina DNV pipeline system Certificate of Conformity and how to retain the certificate during operation if the scopeof work covers a certificate with maintenance conditions.

1.1.4.3 For certification services the verification scope of work is defined in Sec.5. DNV shall independentlyof the customer stipulate the level of verification involvement to be applied.

1.1.4.4 The certification service is based on the principles described in Sec.2. The project specific verificationplan requested in [2.4] shall be developed based on the generic scope of work in Sec.3 and in accordance withthe requirements in Sec.5.




1.1.4.5 Statutory certification of pipeline systems to the requirements of national authorities is not includedspecifically in the scope of application of this OSS. Such certification shall be governed by the regulations ofthe national authorities. However, if detailed procedures are not given by these authorities, this OSS shall beused by DNV as a guideline for DNV’s work.

Guidance note:

The certificate issued shall state that it is issued under authorisation of the relevant authorities, including reference tothe relevant certification scheme.

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1.1.5 Structure of this document

1.1.5.1 This document consist of five sections and four appendices:

1.2 Definitions

1.2.1 General

1.2.1.1 The definitions in DNV-OS-F101 Sec.1 C200 also apply to this OSS.

1.2.1.2 The most important definitions from DNV-OS-F101 applied in this OSS are repeated. They are marked“(DNV-OS-F101)” between the word and its definition, ref. e.g. verification.

1.2.2 Verbal forms

1.2.2.1 Shall: verbal form used to indicate requirements strictly to be followed in order to conform to thedocument.

1.2.2.2 Should: verbal form used to indicate that among several possibilities one is recommended asparticularly suitable, without mentioning or excluding others, or that a certain course of action is preferred butnot necessarily required.

1.2.2.3 May: verbal form used to indicate a course of action permissible within the limits of the document.

1.2.3 Definitions

1.2.3.1 Certification: (ISO 17000:2004): Third-party issue of a statement, based on a decision followingreview, that fulfilment of specified requirements has been demonstrated related to products, processes orsystems. Review shall in this context mean verification of the suitability, adequacy and effectiveness ofselection and determination activities, and the results of these activities, with regard to fulfilment of specifiedrequirements by an object of conformity assessment.

1.2.3.2 Certification service: The process of performing certification. The certification service includes theissuing of a DNV Certificate. The certification service requires a service specification as reference.

Guidance note:

A certification service may be regarded as a verification process which fulfils certain formal requirements. The scopeof work is normally standardized and shall be pre-defined in the form of a publicly available service description, eithera DNV service specification or a nationally or internationally recognized standard which stipulates certification

Sec.1 gives the general scope of the document, definitions and references.

Sec.2 describes the principles of verification based on risk differentiated levels of verification involvement, how to define the level of verification involvement, and how to develop a verification plan/scope of work for a particular project.

Sec.3 describes generic verification activities for each of the project phases.

Sec.4 describes the verification service; scope of work definition and documents issued by DNV as a result of the verification service process.

Sec.5 describes the certification service; requirements for obtaining and retaining a DNV pipeline system Certificate of Conformity, and documents issued by DNV as a result of the certification service process.

App.A poses trigger questions for the selection of level of verification involvement.

App.B contains generic descriptions of project sub-phases.

App.C gives examples of DNV verification and certification service documents.

App.D gives detailed scope of work tables for all project phases and all levels of verification involvement. These tables are generic and the basis for the development of project specific scope of work tables.




requirements. The final deliverable DNV document shall be a certificate. The type of certificate that may be issueddepends on the nature of the certification scope of work.


1.2.3.3 Commissioning (DNV-OS-F101): Activities associated with the initial filling of the pipeline systemwith the fluid to be transported, part of operational phase.

1.2.3.4 Commissioning, Pre- (DNV-OS-F101): Activities after tie-in/connection and prior to commissioningincluding system pressure-testing, dewatering, cleaning and drying.

1.2.3.5 Construction phase (DNV-OS-F101): The construction phase will typically include manufacture,fabrication and installation activities. Manufacture activities will typically include manufacture of linepipe andcorrosion protection and weight coating. Fabrication activities will typically include fabrication of pipelinecomponents and assemblies. Installation activities will typically include pre- and post-intervention work,transportation, installation, tie-in and pre-commissioning.

1.2.3.6 Customer: DNV’s contractual partner. It may be the purchaser, the operator, the owner or a contractor.

1.2.3.7 Design (DNV-OS-F101): All related engineering to design the pipeline including both structural aswell as material and corrosion.

1.2.3.8 Fabrication (DNV-OS-F101): Activities related to the assembly of objects with a defined purpose ina pipeline system.

1.2.3.9 Hazard: A deviation (departure from the design and operating intention) which could cause damage,injury or other form of loss (Chemical Industries Association HAZOP Guide).

1.2.3.10 HAZOP (HAZard and OPerability study): The application of a formal systematic critical examinationto the process and engineering intentions of new or existing facilities to assess the hazard potential of mal-operation or mal-function of individual items of equipment and their consequential effects on the facility as awhole (Chemical Industries Association HAZOP Guide).

1.2.3.11 Installation (activity) (DNV-OS-F101): The operations related to installing the equipment, pipelineor structure, e.g. pipeline laying, tie-in, piling of structure etc.

1.2.3.12 Manufacture (DNV-OS-F101): Making of articles or materials, often in large volumes. In relation topipelines, refers to activities for the production of linepipe, anodes and other components and application ofcoating, performed under contracts from one or more contractors.

1.2.3.13 Operations (phase): The phase when the pipeline is being used for the purpose for which it wasdesigned.

1.2.3.14 Pipeline integrity (DNV-OS-F101): Pipeline integrity is the ability of the submarine pipeline systemto operate safely and withstand the loads imposed during the lifetime cycle.

1.2.3.15 Risk (DNV-OS-F101): The qualitative or quantitative likelihood of an accident or unplanned eventoccurring, considered in conjunction with the potential consequences of such a failure. In quantitative terms,risk is the quantified probability of a defined failure mode times its quantified consequence.

1.2.3.16 Risk Reduction Measures: Those measures taken to reduce the risks to the operation of the pipelinesystem and to the health and safety of personnel associated with it or in its vicinity by:

— reduction in the probability of failure— mitigation of the consequences of failure.

Guidance note:

The usual order of preference of risk reduction measures is:

1) Inherent safety

2) Prevention

3) Detection

4) Control

5) Mitigation

6) Emergency response.


1.2.3.17 Safety Objectives (ref. DNV-OS-F101 Sec.2 B200): The safety goals for the construction, operationand decommissioning of the pipeline including acceptance criteria for the level of risk acceptable to the owner.




1.2.3.18 Verification (ISO 9000:2005): Confirmation, through the provision of objective evidence, thatspecified requirements have been fulfilled.

Guidance note:

The term “verified” is used to designate the corresponding status. Verification can comprise activities such as:

— performing alternative or additional calculations

— comparing a new design specification with a similar proven design specification

— undertaking validation tests

— reviewing documents.


1.2.3.19 Verification service: The verification service includes, in addition to performing verification, theissuing of a deliverable DNV document in which the conclusion of the verification activity is stated.

Guidance note:

The scope of work shall be agreed, and described in a contract, between DNV and the customer. The scope of workmay be described by reference to an object specific DNV service specification or technical standards specified bycustomer. In the case of an object specific DNV service specification forming the basis for verification scopedefinition, any deviation or amendment to the scope of work outlined in the DNV service specification shall beaddressed in the contract. The deliverables shall be agreed in the contract. The type of DNV document(s) that may beissued depends on the extent and nature of the verification scope of work.


1.3 References

DNV-OS-F101 Submarine Pipeline Systems, 2012, Det Norske Veritas, Høvik.

DNV-OSS-300 Risk Based Verification, 2012, Det Norske Veritas, Høvik.

DNV-RP-F105 Free Spanning Pipelines, 2006, Det Norske Veritas, Høvik.

DNV-RP-F109 On-Bottom Stability Design of Submarine Pipelines, 2011, Det Norske Veritas, Høvik.

DNV-RP-F110 Global Buckling of Submarine Pipelines due to High Temperature/High Pressure, 2007, Det Norske Veritas, Høvik.

DNV-RP-F111 Interference Between Trawl Gear and Pipelines, 2010, Det Norske Veritas, Høvik.

DNV-RP-F116 Integrity Management of Submarine Pipeline Systems, 2009, Det Norske Veritas, Høvik.

Chemical Industries Association Limited, London

A Guide to Hazard and Operability Studies, 1979.

ISO 9000:2005 Quality management systems – Fundamentals and vocabulary, International Organization for Standardization, Geneva.

ISO 9001:2008 Quality management systems – Requirements, International Organization for Standardization, Geneva.

ISO 17000:2004 Conformity Assessment—Vocabulary and general principles, International Organization for Standardization, Geneva.



Sec.2 Principles of Risk-Differentiated verification –

SECTION 2 PRINCIPLES OF RISK-DIFFERENTIATED VERIFICATION

2.1 General

2.1.1 Objectives

2.1.1.1 The objectives of this section are to provide:

— introduction to the principles of verification of submarine pipeline systems— introduction to the principles of risk differentiated levels of verification involvement— guidance on the selection of levels of verification involvement— information on how to develop a verification plan— information on involved parties, communication and obligations.

2.2 Verification principles

2.2.1 Purpose of verification

2.2.1.1 Verification constitutes a systematic and independent examination of the various phases in the lifecycleof a pipeline system to determine whether it fulfils the specified requirements.

2.2.1.2 Verification activities are expected to identify errors or failures in the work associated with the pipelinesystem and to contribute to reducing the risks to the operation of the pipeline system and to the health and safetyof personnel associated with it or in its vicinity.

2.2.1.3 Verification is primarily focused on pipeline integrity, but business risk (e.g. cost and schedule) mayalso be addressed.

2.2.2 Verification as a complementary activity

2.2.2.1 Verification shall be complementary to routine design, construction and operations activities and not asubstitute. Therefore, although verification will take into account the work, and the quality assurance andquality control of that work, carried out by the owner and his contractors, it is inevitable that verification willduplicate some work that has been carried out previously by other parties involved in the pipeline project.

2.2.3 Verification management

2.2.3.1 The verification philosophy and verification methods used shall be described to ensure satisfactorycompletion of the verification activities.

2.2.3.2 The philosophy and the methods shall ensure that the verification:

— has a consistent and constructive approach to the satisfactory completion and operation of the pipelinesystem

— is available world-wide wherever the owner or his contractors operate— applies up-to-date methods, tools and procedures— employs qualified and experienced personnel.

2.2.3.3 All verification activities shall be carried out by competent personnel. Competence includes having thenecessary theoretical and practical knowledge and experience of the activity being examined. An adequateverification of some activities may require access to specialised technical knowledge.

2.2.3.4 As well as demonstrating competence of individuals, the verification organisation shall be able to showcompetence and experience in pipeline verification work.

2.2.4 Risk-differentiated levels of verification involvement

2.2.4.1 The approach of risk-differentiated levels of verification involvement shall be applied to the definitionof verification plan/scope of work, as outlined in the general risk based verification service overview in DNV-OSS-300.

2.2.4.2 The level of verification involvement is differentiated according to the risk associated with thepipeline. If the risk associated with the pipeline is higher, the level of verification involvement is higher.Conversely, if the risk associated with the pipeline is lower, the level of verification involvement can bereduced, without reducing the verification effectiveness.

2.2.4.3 The verification involvement is categorised into low, medium and high. A summary of the levels ofinvolvement is given in Table 2-1. This table covers verification during the project phase, for verificationduring operation of a pipeline the verification involvement should be categorised into levels based on the sameprinciples.




2.2.4.4 The selection of level of verification involvement shall be based on a risk based verification planningprocess.

2.2.4.5 The basis for the selection of level of verification involvement shall be documented.

2.2.4.6 Different levels of verification involvement can be chosen for different phases of the pipeline system,or even parts of the pipeline system within the same phase.

Guidance note:

For example, pipeline design may be innovative and considered high risk whereas the installation method is wellknown and considered low risk. The converse might also be the case.

Additionally, linepipe production from a well-known mill may be considered low risk, whereas, production from anunknown mill may be considered high risk.


2.2.4.7 The level of verification involvement can be reduced or increased during a phase if the originallychosen level is considered too rigorous or too lenient, as new information on the risks associated with thepipeline system becomes available.

Medium is the customary level of verification involvement and is applied to the majority of pipelines.

High is the level of verification involvement applied where the risks associated with the pipeline are higher because, for example, it has highly corrosive contents, it is in adverse environmental conditions, it is technically innovative or the contractors are not well experienced in the design and construction of similar pipelines.

Low is the level of verification involvement applied where the risks associated with the pipeline are lower because, for example, it has benign contents, it is located in congenial environmental conditions, or the contractors are well experienced in the design and construction of similar pipelines.

Table 2-1 Summary of verification involvement and guidance for their applicability – project phase

Level Description of verification involvement Guidance for typical application for each level of involvement

Low — Review of general principles and production systems during design and construction.

— Review of principal design documents, construction procedures and qualification (e.g. MPQT) reports.

— Visit-based attendance during system testing and start-up activities.

— Less comprehensive involvement than level Medium.

— Proven pipeline designs with benign contents and/or installed in benign environmental conditions.

— Straightforward pipelines designed and constructed by experienced contractors.

— Low consequences of failure from a safety, environmental or commercial point of view.

— Relaxed to normal completion schedule.

Medium — Review of general principles and production systems during design and construction.

— Detailed review of principal and other selected design documents with support of simplified independent analyses.

— Full time attendance during (procedure) qualification (e.g. MPQT) and review of the resulting reports.

— Visit-based or intermittent presence at site.

— Pipelines in moderate environmental conditions.— Projects with a moderate degree of novelty.— Medium consequences of failure from a safety,

environmental or commercial point of view.— Ordinary completion schedule.

High — Review of general principles and production systems during design and construction.

— Detailed review of most design documents with support of simplified and advanced independent analyses.

— Full time attendance during (procedure) qualification (e.g. MPQT) and review of the resulting reports.

— Full time presence at site for most activities.— More comprehensive involvement than level

Medium.

— Projects with a high degree of novelty or large leaps in technology.

— Pipelines in extreme environmental conditions.— Inexperienced contractors or exceptionally tight

completion schedule.— Very high consequences of failure from a safety,

environmental or commercial point of view.




2.3 Selection of level of verification involvement

2.3.1 Selection factors

2.3.1.1 The selection of the level of verification involvement shall depend on the criticality of each of theelements that have an impact on the management of hazards and associated risk levels of the pipeline system.This is illustrated by Figure 2-1.

The contribution of each element shall be judged qualitatively and/or quantitatively and shall use, wherepossible, quantified risk assessment data to provide a justifiable basis for any decisions made.

Appendix A gives a guideline on selection of level of verification involvement based on a simplified riskassessment.

2.3.1.2 Selection factors are the:

— overall safety objectives for the pipeline system— assessment of the risks associated with the pipeline and the measures taken to reduce these risks— degree of technical innovation in the pipeline system— experience of the contractors in carrying out similar work— quality management systems of the owner and his contractors.

Guidance note:

These factors are addressed in DNV-OS-F101 Sec.2 B.


Figure 2-1 Selection of the level of verification involvement based on risk assessment

2.3.2 Overall safety objective

2.3.2.1 An overall safety objective covering all phases of the pipeline system from design to operation shouldbe defined by the customer. The safety objective should address the main safety goals as well as establishingacceptance criteria for the level of risk acceptable to the owner. Depending on the pipeline and its location therisk could be measured in terms of human injuries as well as environmental, political and economicconsequences.

2.3.3 Risk assessment

2.3.3.1 A systematic review, i.e. a detailed analytical risk assessment, a simplified risk assessment based ontrigger questions (ref. App.A), or a combination thereof; shall be carried out to identify and evaluate theprobabilities and consequences of failures in the pipeline system. The extent of the review shall reflect thecriticality of the pipeline system, the planned operation and previous experience with similar pipeline systems.This review shall identify the risks associated with the operation of the pipeline system and to the health andsafety of personnel associated with it or in its vicinity.

2.3.3.2 Once the risks have been identified their extent can be reduced to a level as low as reasonablypracticable by means of one or both of:

— reduction in the probability of failure— mitigation of the consequences of failure.




Guidance note:

The term “as low as reasonably practicable (ALARP)” has come into use through the United Kingdom’s “The Healthand Safety at Work etc. Act 1974”. Reasonable Practicability is not defined in the Act but has acquired meaning byinterpretations in the courts.

It has been interpreted to mean that the degree of risk from any particular activity can be balanced against the cost,time and trouble of the measures to be taken to reduce the risk.

It follows, therefore, that the greater the risk the more reasonable it would be to incur substantial cost, time and effortin reducing that risk. Similarly, if the risk was very small it would not be reasonable to expect great expense or effortto be incurred in reducing it.


2.3.3.3 The result of the systematic review of these risks is measured against the safety objectives and used inthe selection of the appropriate verification involvement level.

2.3.4 Technical innovation and contractor experience

2.3.4.1 The degree of technical innovation in the pipeline system shall be considered. Risks to the pipeline arelikely to be greater for a pipeline with a high degree of technical innovation than with a pipeline designed,manufactured and installed to well-known criteria in well-known waters.

2.3.4.2 Similarly, the degree of risk associated with the pipeline system should be considered wherecontractors are inexperienced or the work schedule is tight.

2.3.4.3 Factors to be considered in the selection of the appropriate verification involvement level include:

— degree of difficulty in achieving technical requirements— knowledge of similar pipelines— knowledge of contractors’ general pipeline experience— knowledge of contractors’ experience in similar work.

2.3.5 Quality management systems

2.3.5.1 Adequate quality management systems shall be implemented to ensure that gross errors in the work forpipeline system design, construction and operations are limited. The adequacy of the quality managementsystem should influence the selection of the level of verification involvement.

2.3.5.2 Factors to be considered when evaluating the adequacy of the quality management system include:

— whether or not an ISO 9001 or equivalent certified system is in place— results from external audits— results from internal audits— experience with contractors’ previous work— project work-force familiarity with the quality management system, e.g. has there been a rapid expansion

of the work force or are all parties of a joint venture familiar with the same system.

Guidance note:

Most organisations have quality management systems certified by an accredited certification body. However, whenbusiness increases, they expand their staff quickly by taking on contract personnel often for a fixed period or for theduration of a particular contract.

This influx of new personnel can lead to problems of control of both the whole organisation and of particular projectsbeing undertaken. Quality problems may then occur, as these new personnel have no detailed knowledge of theorganisation’s business methods, its ethos or its working procedures. New organisations may experience qualityproblems for similar reasons.


2.4 Defining a verification plan / scope of work

2.4.1 Risk based verification planning

2.4.1.1 Based on the pipeline system specifications, the risk assessment and the selection of level ofverification involvement, a verification plan shall be developed.

2.4.1.2 The verification plan is the scope of work for DNV’s verification. It should be re-visited, re-evaluatedand revised if required as the project progresses and new information becomes available.

2.4.1.3 Generic scopes of work for verification at the three levels of verification involvement, Low (L),Medium (M) and High (H), are given in the tables in Sec.3.




2.4.1.4 Typical detailed scope of work descriptions, which are based on the generic scopes of work and whichshow the activities to be verified, are given in App.D.

2.4.1.5 A specific scope of work description shall be made for each particular project, and shall be included inthe final DNV verification report.

2.5 Information flow

2.5.1 Communication lines

2.5.1.1 Communication lines are illustrated in Figure 2-2. Which lines that are open for communicationdepends on the particular contractual agreements.

2.5.1.2 Where DNV’s customer is the designer/constructor and not of the owner (operator) of the pipelinesystem, DNV strongly recommends that the owner secures a direct communication line from DNV to ownerand vice versa.

Guidance note:

The recommendation stems from DNV’s experience with projects where communications difficulties between theparties have jeopardised the issue of the pipeline verification statement.


Figure 2-2 Communication Lines

2.5.2 Obligations

2.5.2.1 In order to achieve the purpose and benefits of verification the involved parties shall be mutuallyobliged to share and act upon all relevant information pertaining to the verification involvement.

2.5.2.2 The customer shall be obliged to:

— Give DNV full access in due time to all information concerning the verification scope for the pipelinesystem and ensure that clauses to this effect are included in contracts for parties acting on behalf of theowner and parties providing products, processes and services covered by the verification scope.

— Ensure that DNV is involved in the handling of deviations from specified requirements within theverification scope.

— Act upon information provided by DNV with respect to events or circumstances that may jeopardise thepipeline system and/or the purpose and benefit of verification.

— Ensure that the safety and integrity objectives established for the pipeline project are known and pursuedby parties acting on behalf of the customer and parties providing products, processes and services coveredby the verification scope.

2.5.2.3 The customer shall further be obliged to ensure that the designer and/or contractor:

— Perform their assigned tasks in accordance with the safety and integrity objectives established for thepipeline project.

— Provide the owner and DNV in due time with all relevant information pertaining to the verification scope.

Owner/

operator

DNV

Designer/

constructor




2.5.2.4 DNV shall be obliged to:

— Inform the customer of events or circumstances that, in the opinion of DNV, may jeopardise the pipelinesystem integrity and/or the purpose and benefit of verification.

— Effectively perform all verification work and adjust, through a formalised change to the contract, the levelof verification involvement according to the actual performance of parties providing products, processesand services.

2.5.3 Notification of level of verification involvement

2.5.3.1 An assessment of the required level of verification involvement for a project may be made by the ownerbefore preparing tender documents for design and construction activities. The owner can then specify this levelin Invitation to Tender (ITT) if a verification service is part of the scope of work. This will give contractorsguidance and reference when estimating the extent and cost of efforts associated with verification activities.

Guidance note:

For determination of the verification scope of work for certification based on this OSS, DNV shall independently ofthe customer stipulate the level of verification involvement to be applied.


2.5.3.2 The required level of verification involvement may be assessed by the owner using this OSS. If theowner requires the contractor to carry out this assessment as part of his response to an ITT the owner shouldprovide the necessary information to enable the contractor to carry out this work. This information shouldinclude overall safety objectives for the pipeline system as well as particulars, such as temperatures, pressures,contents and environmental criteria, commonly contained in a design brief.

Guidance note:

Frequently, ITTs contain the statement “…. the contractor shall arrange 3rd party verification.” The use of theinformation contained in this OSS should assist the owner to specify the required level of verification involvementmore precisely.

On other occasions where the verification is arranged by the owner, it is be important that contractors are informed ofthe level of verification involvement planned.




Sec.3 Verification activities –

SECTION 3 VERIFICATION ACTIVITIES

3.1 General

3.1.1 Objectives


— an overview of verification activities relating to offshore pipeline systems— generic scope of work tables for verification at the three levels of verification involvement, Low (L),

Medium (M) and High (H).

3.1.2 Scope of work

3.1.2.1 The process of defining a verification plan with a scope of work is described in [2.4]. Responsibilitiesand requirements to the definition of the verification plan are addressed in [1.1.3] and [1.1.4] for verificationservice and certification service, respectively.

3.1.2.2 The verification activities described in the scope of work tables are generic. Their relative risk rating,represented by the type of involvement at the different verification involvement levels, is experienced basedand does not take into account the specifics or differences between flow-line and export lines, sweet and sourgas, etc.

3.2 Project phases

3.2.1 General principles

3.2.1.1 DNV’s verification scope for pipeline systems is based on distinct project phases and the recognitionof key milestones.

3.2.1.2 The verification process may follow the project phases:

3.2.1.3 Project initiation:

— conceptual design— basic design / FEED (Front End Engineering Design).

3.2.1.4 Project realisation:

— detail design— construction/fabrication— construction/installation— pre-commissioning— project completion.

3.2.1.5 Project operation:

— commissioning, operations, maintenance and repair.

Guidance note:

The above phases generally follow the main sections of DNV-OS-F101. Where projects or other standards use otherterms, these can be used provided they are well defined and agreed.

Appendix C includes some generic descriptions of typical sub-phases. This may be used as guidance when agreeingthe content or completeness of a sub-phase.


3.3 Project initiation

3.3.1 Verification during conceptual design

3.3.1.1 Verification during early stages of a project can reduce the need for verification during the design andconstruction phases. The scope of work shall be agreed in each case.

3.3.1.2 It is advisable to combine the design verification during conceptual design with additional review of:

— environmental aspects— project schedule— project cost.




3.4 Project realisation

3.4.1 General

3.4.1.1 All design and construction aspects relevant to pipeline integrity may be covered by the verificationservice. During design the specifications (requirements) are developed, while the construction proceduresdescribe how the requirements shall be satisfied and implemented during construction.

3.4.2 Verification of overall project management

3.4.2.1 Verification of the overall project management is the examination of the means of controlling thepipeline project.

3.4.2.2 This verification is to confirm that the necessary controls are in place to ensure information flowsacross the various interfaces. This is especially important where separate contractors have been employed fordifferent phases of the project such as design and installation.

3.4.2.3 Typically, it is expected that the quality management documentation is in line with ISO 9001requirements.

3.4.2.4 Definition of scope of work for verification of overall project management at the different levels ofverification involvement should follow Table 3-1.

3.4.3 Verification during design

3.4.3.1 Design verification is the examination of the assumptions, methods and results of the design processand is performed at the specified level of verification involvement to confirm that the requirements to thespecific pipeline system will be fulfilled.

3.4.3.2 Design verification shall consist of one, or more, of:

— reviewing the design process

— reviewing specifications for design

— reviewing design reports and drawings

— performing independent parallel calculations

— reviewing specifications for construction and operation, resulting from design.

3.4.3.3 The documents that should be produced in the design phase are given in DNV-OS-F101 Sec.12 B100-B600.

3.4.3.4 Definition of scope of work for verification of design at the different levels of verification involvementshould follow Table 3-2.

Table 3-1 Scope of work for verification of overall project management

Verification activityLevel of involvement

L M H

Review of the project management process by:

— review of project quality management documentation x x x

— audit of project quality management system x x

— review of sub-contractor control x x

— review of interface controls x x

— review of methods of information flow x x

Table 3-2 Scope of work for verification of design


L M H

Review of the design process by:

— review of design quality management documentation x x x

— audit/attend owner’s audit of design quality management system x

Review of specifications for design by:

— review of the design basis with emphasis of the survey results and environmental data. Evaluation of the design criteria

x x x

— review of pipeline routing1) x x




Guidance note:

Design verification activities may be split between Basic Design (sometimes called FEED, and which may performedas a part of the Project Initiation phase) and Detailed Design, or other sub-phase, depending on type of contract.


3.4.4 Verification during construction

3.4.4.1 Verification during construction shall be carried out by means of full time attendance, audits,inspections or spot checks of the work, as appropriate, in sufficient detail to confirm that the specifiedrequirements of the pipeline system will be fulfilled.

3.4.4.2 Verification of these activities relates not only to the contractor’s work, but also to the monitoring ofthis work carried out by others.

3.4.4.3 During construction verification shall consist of one, or more, of:

— reviewing the construction engineering— reviewing construction procedures— reviewing qualification process— surveillance during construction activities— reviewing final documentation.

3.4.4.4 The documents that should be produced in the project are given in DNV-OS-F101 Sec.12 C100, C200,C300, D100 and D200.

3.4.4.5 Definition of scope of work for verification of construction at the different levels of verificationinvolvement should follow Table 3-3 and Table 3-4 for manufacturing and fabrication, Table 3-5 forinstallation, Table 3-6 for final testing and project completion, and Table 3-7 for pipeline control and safetysystems.

Review of design reports and drawings by2):

— review of the main pipeline documentation to confirm that the main load conditions have been accounted for in design, that the governing conditions are identified, and that the chosen design philosophies including pipeline safety system are in accordance with specified codes and standards

x x x

— evaluation of the main methods used and spot checks of the input data and the calculation results

x x

— detail review of main design reports x

Performing independent parallel calculations by:

— check of wall thickness x x x

— simplified independent analyses/ calculation(s) performed by spot checks x x

— advanced independent analyses/ calculation(s) performed by spot checks x

Review of specifications for construction and operation by:

— spot check of critical aspects x x x

— review of main specifications x x

— detailed review of main specifications x

Review of flow assurance (non-integrity aspects3)) by:

— general principles x x x

— review of main documents supported by simplified analyses x x

Notes:

1) Verification activity to be agreed case by case considering aspects as

— general knowledge of the area— criticality of the results.

2) If the pipeline system is designed for different pressures along the pipeline (segmented design) this should be reflected in the verification scope of work regarding flow assurance, in addition to wall thickness, safety systems, etc.

3) These are optional certification services.

Table 3-2 Scope of work for verification of design (Continued)


L M H




Guidance note:

Line pipe and other materials may be ordered with certificates (e.g. 3.2 according to EN 10204). This can be integratedin the overall verification activities, so as not to duplicate work.


Table 3-3 Scope of work for verification of manufacturing and fabrication of linepipe, incl. external linepipe coating, and other pressure containing components


L M H

Review of the manufacturing & fabrication process by:

— review of manufacturing and fabrication management systems x x x

— audit or attend owner’s audit of the quality management system x

Review of manufacturing & fabrication procedures by:

— review manufacturing, fabrication and inspection procedures for confirmation of compliance with the manufacturing specifications

x x x

Review of qualification process by:

— review the manufacturing procedure specification, (MPS), and manufacturing procedure qualification test (MPQT), if applicable

x x x

— full time attendance during MPQT, if applicable, or first day production x x

Surveillance during manufacturing and fabrication activities by:

— visit-based attendance during testing, to confirm, based on spot checks, that the delivered products have been produced in accordance with the manufacturing specification

x x x

— visit-based or full-time attendance during manufacturing and fabrication to confirm, based on spot checks, that the delivered products have been produced in accordance with the manufacturing specification

x

— full-time attendance during manufacturing and fabrication to confirm, based on spot checks, that the delivered products have been produced in accordance with the manufacturing specification

x

Review of final documentation x x x

Table 3-4 Scope of work for verification of manufacturing and fabrication of coatings (internal coating and concrete coating), anodes and other non-pressure containing components


L M H

Review of the manufacturing & fabrication process by:

— review of manufacturing and fabrication management systems x x x

— audit/attend owner’s audit of the quality management system x

Review of manufacturing & fabrication procedures by:

— review manufacturing, fabrication and inspection procedures for confirmation of compliance with the manufacturing specification

x x


— review the manufacturing procedure specification, (MPS), manufacturing procedure qualification test (MPQT), if applicable

x x x

— full time attendance during MPQT, if applicable, or first day production x

Surveillance during manufacturing and fabrication activities by:

— visit-based attendance during testing, manufacturing and fabrication to confirm, based on spot checks, that the delivered products have been produced in accordance with the manufacturing specification

x x





Table 3-5 Scope of work for verification of installation


L M H

Review of the installation process by:

— review of installation management systems x x x

— audit/attend owner’s audit of the quality management system x x

Review of installation engineering documentation by:

— spot check of installation manual (IM)1) x x x

— review of installation analyses x x

— for critical operations (identified from the FMEA and HAZOP studies) review the IM

x x


— for critical operations, review the qualification of the IM x x x

— full time attendance during qualification tests, if applicable, or production start-up

x x

Surveillance during installation activities by:

— visit based (one shift) attendance during start up of each operation (i.e. pipelaying, riser installation, onshore sections installation, intervention works, etc.)

x x x

— full time attendance during tension trials and associated lay tests: visit based (one shift) attendance during installation

x x

— full time attendance at each operation (i.e. pipelaying, onshore section installation, riser installation, intervention works, etc.)

x


Note:

1) Installation Manual (IM) is defined as a document or collection of documents required for performing the project specific installation work including normal operations and contingency handling/operations and acceptance criteria.

Table 3-6 Scope of work for verification of pre-commissioning, as-built survey and project completion


L M H

Review of the process by:

— review of management systems x x x


Review of procedures by:

— review of the procedures for pre-commissioning x x x

Surveillance during testing and completion activities by:

— full time attendance during pressure testing x x x

— visit based attendance during cleaning, gauging, de-watering and drying. x x


Table 3-7 Scope of work for verification of pipeline control and safety systems


L M H

Review of the process by:

— review of management systems x x x


Review of procedures by:

— review of the procedures and test plans x x

Surveillance during testing and validation by:

— visit based attendance x

— full time attendance x x





3.5 Operation

3.5.1 Verification during operation

3.5.1.1 Verification during operation shall be carried out by audits or spot checks of the work and records insufficient detail to confirm that the specified requirements of the pipeline system continue to be fulfilled andthereby confirming that the pipeline system integrity is maintained.

3.5.1.2 Assessment of these activities shall relate to the owner’s, as well as any contractor’s, work.

3.5.1.3 These assessments shall consist of:

— review of operations processes:

— review of operations management systems— audit of the quality management system, if necessary— risk assessments— implementation of commissioning, operation and inspection philosophies.

— review of operations manual, specifications and procedures:

— commissioning procedures— confirmation of design assumptions— method statements— inspection plans— inspection methods— procedures for evaluation of inspection results.

— attendance during operations activities:

— attendance during inspections, e.g. by modifications and repairs.

— review of monitoring and inspection records and assessments.

3.5.1.4 The documents that shall be produced in the project are given in DNV-OS-F101 Sec.12 E, F.

3.5.1.5 Scope of work for verification in the operations phase at the different levels of verification involvementshould follow Table 3-8 for commissioning, Table 3-9 for operation and Table 3-10 for modifications andrepairs.

Table 3-8 Scope of work for verification of commissioning


L M H

Review of the preparation process by:

— review of main documents to check compliance with applicable design documentation

(x) x x

Surveillance during commissioning by:

— audit attendance (x) x


Table 3-9 Scope of work for verification of operation of the pipeline


L M H


— review of main operating documents in the Integrity Management System1) x x x

Review during operation by:

— start-up review of implementation of the Integrity Management System; operational and safety philosophy, risk assessment and integrity management plan

x x x

— review of regular assessment reports from operational records x x

— review of preparation for periodical surveys x x

— review of reports from periodical surveys x x

Surveillance during operation by:

— audit during start-up of periodical surveys x x




3.5.1.6 Annual assessments shall be carried out to confirm that any deterioration of the pipeline system iswithin acceptable limits and that the pipeline continues to comply with the design code requirements. Theassessments shall include review of records confirming that the pipeline has been operated within its designlimits.

3.5.1.7 Additional assessments shall be carried out in case of damage, deterioration or modification to thepipeline system to confirm that it continues to comply with the design code requirements.

— audit in control room of procedures and quality management x x

Review of final documentation:

— Review of annual integrity assessment reports x x x

Note:

1) Ref. DNV-RP-F116 Sec.2

Table 3-10 Scope of work for verification of modification and repairs


L M H


— review of main modifications or repairs documents x x x

Surveillance during modification and repair by:

— audit during start-up for significant modifications or repairs x x x

— visit based attendance during modifications or repairs x x

— full time attendance during significant modifications or repairs x

Review of final documentation:

— Review of modification and repair reports x x x

— Review of resulting updates to the pipeline system documentation x x

Table 3-9 Scope of work for verification of operation of the pipeline (Continued)


L M H



Sec.4 Verification service requirements –

SECTION 4 VERIFICATION SERVICE REQUIREMENTS

4.1 General

4.1.1 Objectives


— details of DNV’s verification services for submarine pipeline systems — details of DNV’s deliverables for verification service for submarine pipeline systems.

4.1.2 Scope of work

4.1.2.1 The verification service is described in [1.1.3].

4.1.2.2 The scope of work is determined by and shall be described in a contract between DNV and thecustomer.

4.1.2.3 [2.4] describes the process of defining a risk-differentiated verification plan / scope of work. Thecustomer may stipulate the level of verification involvement.

4.1.2.4 The scope of work may refer to DNV-OS-F101 or to other recognized technical standards orregulations.

4.1.2.5 The scope of work may be amended as agreed between DNV and the customer.

4.2 Verification service documents

4.2.1 General

4.2.1.1 The type of DNV documents that may be issued depends on the extent and nature of the verificationscope of work.

4.2.1.2 DNV may issue verification service deliverables during the execution of the verification scope, and atits completion.

The purpose of the deliverables is to document the scope of work performed, and the conclusions reached, byDNV. The verification documents typically follow the hierarchy shown in Figure 4-1 below.

Figure 4-1 Typical document hierarchy for verification service

4.2.2 Statement of conformity

4.2.2.1 A Statement of Conformity may be issued by DNV as a statement confirming that verification ofdocuments and/or activities has concluded that the pipeline system complies with specified requirements. Inorder for DNV to issue a Statement of Conformity the following requirements apply:

— The scope shall cover the complete pipeline system or a major self-contained part of it. Major self-contained part shall mean a complete system, or the integration of more systems, to which risk basedverification is or may be applied.



Sec.4 Verification service requirements –

— DNV shall have accepted the level of verification involvement to be satisfactory in relation to the risksassociated with the pipeline system or self-contained part of it.

— It may be issued upon completion of the total verification scope, or at completion of logical phases, e.g.design or fabrication.

— There shall not be omissions in the verification scope which may lead to misinterpretation of the Statementof Conformity, e.g. in the design verification scope aspects like safety or structural integrity may not beomitted from individual components or systems.

— There shall be no unresolved deviations, i.e. no open verification comments, which inherently infringe theintegrity of the pipeline system. In case of unresolved deviations, these shall be clearly identified in theVerification Report, ref. [4.2.3.6].

— The statement is valid on the date of issue.

4.2.2.2 Alternatives to detailed requirements/solutions specified in DNV Offshore Standards may be acceptedby DNV provided the pipeline integrity and reliability level is documented to be equivalent or better than thespecified requirements/solutions. This principle of equivalence does not apply to verification against non-DNVreference documents.

4.2.2.3 The Statement of Conformity shall be supported by a Verification Report, which shall be referencedfrom the Statement of Conformity.

4.2.3 Verification report

4.2.3.1 A Verification Report may be issued by DNV as a statement confirming the conclusion of theverification process. A Verification Report may in principle be issued at any stage of the verification process.

4.2.3.2 A Verification Report shall be issued in conjunction with a Statement of Conformity.

4.2.3.3 A Verification Report may be in the form of a close-out report covering the completion of a self-contained part of the verification of a pipeline system.

4.2.3.4 A Verification Report may be the final deliverable if the requirements to a Statement of Conformityare not fulfilled or a Statement of Conformity is not required.

4.2.3.5 Deviations from requirements shall be highlighted in the Verification Report. In the summary and/orin the introduction, it shall be stated if there are unresolved deviations, with a reference to where in the reportthey are addressed in detail. Deviations that are addressed through alternative solutions shall be included in thelist. Such solutions may imply e.g. operational limitations.

4.2.3.6 In summary, the Verification Report shall include:

— Reference to the contract under which the work has been carried out.— Product or service description and item number, if relevant.— Application (operational limitations and conditions of use) for which the product is intended.— Verification scope of work, including level of verification involvement, if applicable.— Codes and Standards which the product or service has been verified against.— Clear statement of the conclusion from the verification (does it or does it not meet the specified

requirements).— List of documentation on which the verification report is based (reports, drawings, correspondence etc.).— Unresolved deviations/non-conformities (open comments).

4.2.4 Intermediate documents

4.2.4.1 DNV may issue intermediate documentation of progress or conclusion related to individualverification elements:

— a document review— a site visit— a test.

4.2.4.2 Intermediate deliverables may be in the form of:

— verification comments (may be listed in VerCom [C.1.4], letter, email or other agreed communication type)— visit report

— audit report— survey report— project progress reports.



Sec.5 Certification service requirements –

SECTION 5 CERTIFICATION SERVICE REQUIREMENTS

5.1 General

5.1.1 Objectives


— an overview of certification service relating to submarine pipeline systems— details of DNV’s certification services for submarine pipelines systems.

5.1.2 Scope of work

5.1.2.1 The certification service is described in [1.1.4] and is part of the certification requirements.

5.1.2.2 The process of defining a verification plan with a scope of work is described in [2.4].

5.1.2.3 For a DNV Certificate of Conformity for the design and construction phase, at project completion, thescope of work shall include the verification activities described in the scope of work [3.4], Table 3-1 to Table3-6 and, if relevant, Table 3-7. The scope of work is further defined by the result of the DNV risk assessmentand the resulting conclusion with regard to applicable level of involvement. During the project the correctnessand relevance of the DNV risk assessment shall be revisited by DNV and if applicable the level of involvementfor parts of the scope shall be adjusted. Additional verification activities may also result from the updated riskassessments. Changes to the scope of work and level of involvement shall be reflected in the formal verificationplan.

5.1.2.4 The verification plan shall state clearly the physical boundaries of the pipeline system covered by theverification scope of work. The certificate shall not extend significantly beyond the pipeline system designedaccording to DNV-OS-F101, neither shall it include major components not covered in the scope of work tablesin Sec.3.

Guidance note:

Other non-pressurised components and structures like pipeline manifolds, riser bases and valve protections structuresmay be part of the verification scope. Guidance for verification involvement is given in other offshore servicespecifications in the OSS series.


5.1.2.5 The verification scope of work for certification service shall be in accordance with the scoperequirements of this OSS. Generally, this verification scope of work should not be amended.

Guidance note:

The objective of the certification service is pipeline integrity (ref [1.1.4]) and the generic scope of work tables aredefined for meeting this objective.

Other objectives and other aspects, such as the verification of the environmental impact of the pipeline system, or itssuitability with respect to flow capacity and flow assurance, may be included in DNV’s scope of work, if desired bythe customer. However, this work shall then be undertaken as a verification service and defined and reportedseparately from the certification work.


5.1.2.6 For a DNV Certificate of Conformity to be retained in the operation phase, a certificate withmaintenance conditions, ref. [5.2.2], the additional scope of work shall include the verification activitiesdescribed in the scope of work [3.5], Table 3-8 to Table 3-9 and, if relevant, Table 3-10. The scope of work isfurther defined by the result of the DNV risk assessment and the resulting conclusion with regard to applicablelevel of involvement. During the certificate maintenance period the correctness and relevance of the DNV riskassessment shall be revisited by DNV and if applicable the level of involvement for parts of the scope shall beadjusted. Additional verification activities may also result from the updated risk assessments. Changes to thescope of work and level of involvement shall be reflected in the formal verification plan.

5.1.2.7 Conditions and scope of work for retention of certificate during pipeline operation is further describedin [5.3].

5.2 Certification service documents

5.2.1 General

5.2.1.1 DNV may issue certification service deliverables during the execution of the verification scope, and atits completion. The purpose of the deliverables is to document the scope of work performed, and theconclusions reached, by DNV. The deliverables pertaining to certification services consist in principle of the




same type of documents as the verification service deliverables, however, with an overlying Certificate ofConformity. Hence, the general hierarchy of documents is typically as illustrated in Figure 5-1.

Figure 5-1 Typical document hierarchy for certification service

5.2.1.2 The types of documents issued by DNV for the different stages of the certification process areillustrated in Table 5-1.

5.2.2 Certificate of conformity

5.2.2.1 A Certificate of Conformity may be issued by DNV as a formal statement confirming that verificationof documents and activities has concluded that the pipeline system has been designed and constructed inaccordance with specified requirements, i.e. with a positive conclusion on the verification work and withoutpending verification comments. The Certificate of Conformity shall, as a main rule, cover the complete pipelinesystem and be issued upon successful completion of the verification scope of work for the certification.

5.2.2.2 A Certificate of Conformity may be issued with maintenance conditions for retention of the certificateduring the operation phase of a pipeline system, ref. [5.3].

5.2.2.3 The Certificate of Conformity shall be supported by Statements of Conformity and/or one or moreVerification Reports, which shall be referenced from the Certificate of Conformity.

5.2.2.4 In cases where only one Statement of Conformity would be required, the Statement of Conformityshould be omitted.

Table 5-1 Pipeline certification – Documents provided by DNV

Reference Standard for certification

Offshore Standard DNV-OS-F101 Submarine Pipeline Systems

Project Phases

DESIGN CONSTRUCTION OPERATION

Co

nce

ptu

al

Des

ign

Det

ail

Des

ign

Man

ufa

ctu

rin

g o

f L

inep

ipe

Man

ufa

ctu

rin

g o

f P

ipel

ine

Co

mp

on

ents

an

d A

ssem

bli

es

Man

ufa

ctu

rin

g o

f C

orr

osi

on

P

rote

ctio

n a

nd

Wei

gh

t

Inst

alla

tio

n

Pro

ject

Co

mp

leti

on

Co

mm

issi

on

ing

,O

per

atio

n,

Mo

dif

icat

ion

s an

d

rep

air

Types of Certification

Documents Provided

Verification Report

Statement of Conformity for individual phaseor natural part thereof

Certificate of

Conformity

Certificate of Conformity (retention)




5.2.2.5 The Certificate of Conformity is valid on the date of issue, unless it has been issued with maintenanceconditions and specified validity period, ref. [5.3].

5.2.3 Statement of conformity

5.2.3.1 A Statement of Conformity may be issued by DNV as a statement confirming that verification ofdocuments and/or activities has concluded that the object complies with specified requirements. In order forDNV to issue a Statement of Conformity the following requirements apply:

— It shall cover the complete, integrated installation/facility or a major self-contained part of it. Major self-contained part shall mean a complete system, or the integration of more systems, to which risk basedverification is or may be applied.

— It may be issued upon completion of the total verification scope, or at completion of logical phases, e.g.design or fabrication.

— There shall not be omissions in the verification scope which may lead to misinterpretation of the Statementof Conformity, e.g.; in the design verification scope aspects like safety or structural integrity may not beomitted from individual components or systems.

— There shall be no unresolved deviations, i.e.; no open verification comments, which inherently infringe thesafety and/or integrity of the pipeline system.

— The statement is valid on the date of issue.

5.2.3.2 Alternatives to detailed requirements/solutions specified in DNV Offshore Standards may be acceptedby DNV provided the pipeline integrity and reliability level is documented to be equivalent or better than thespecified requirements/solutions. This principle of equivalence does not apply to verification against non-DNVreference documents.

5.2.3.3 The Statement of Conformity shall be supported by a Verification Report, which shall be referencedfrom the Statement of Conformity.

5.2.3.4 In case a Statement of Conformity, according to the contract, shall not be issued, other documentsissued by DNV, like the accumulated Verification Reports, Verification Letters, status reports etc. mayconstitute the appropriate supporting documentation for the Certificate of Conformity. Such documents shallthen be referenced from the Certificate of Conformity, e.g. in the form of an attached list of relevant documents.Traceability shall be ensured.

5.2.4 Verification report

5.2.4.1 Verification as part of a certification service shall be documented by a Verification Report, ref. [4.2.3].A Verification Report may be issued by DNV as a statement confirming the conclusion of the verification.

5.2.4.2 A Verification Report shall be issued in conjunction with a Statement of Conformity and/or aCertificate of Conformity.

5.2.5 Intermediate documents

5.2.5.1 DNV may issue intermediate documentation of progress or conclusion on individual verificationelements. For description of intermediate documents see [4.2.4].

5.3 Retention of pipeline certificate

5.3.1 General

5.3.1.1 The certification service may include verification in order to retain the pipeline certificate during theoperations phase.

5.3.1.2 A prerequisite for the retention of validity of pipeline certificate in the operations phase is that an in-service contract has been established between the owner and DNV.

5.3.1.3 Retention of the pipeline certificate may only take place if the certificate is issued with maintenanceconditions.

5.3.2 Certificate of conformity with maintenance conditions

5.3.2.1 A DNV Certificate of Conformity with maintenance conditions may be issued by DNV as a formalstatement confirming that verification of documents and activities has concluded that the pipeline system hasbeen designed, constructed, commissioned and is operated in accordance with specified requirements. Inaddition to this statement, the pipeline certificate with maintenance conditions shall contain:

— conditions of validity— signature positions for confirmation of annual assessment.




5.3.2.2 The period of validity of a pipeline certificate shall not exceed 5 years. After that period the pipelinecertificate may be reissued, provided a satisfactory overall condition assessment has been carried out.

5.3.3 Requirements for pipeline certificate retention

5.3.3.1 A pipeline systems in operation may retain the pipeline certificate provided:

— the owner provides documentation from commissioning, operation, inspection and maintenance activitiesto demonstrate continued compliance with the design assumptions

— the owner maintains any installed systems for condition monitoring and carries out condition evaluationsas applicable

— information about damages, repairs and modifications, which may affect the certification, is promptlyreported to DNV

— any nonconformity report issued by DNV is acted upon within the specified time.

5.3.3.2 The customer (operator/owner) shall provide DNV with the plans, specifications and proceduresconcerning operation, inspection and maintenance activities for acceptance. DNV acceptance is required for:

— operating and maintenance procedures and revisions to them— inspection programmes and requirements— inspection scopes of work— condition monitoring programmes.

5.3.3.3 The customer shall provide DNV with:

— relevant operation reports— inspection results — condition monitoring report findings.

5.3.3.4 The customer shall notify DNV immediately if:

— the pipeline system is damaged, or is suspected of having been damaged in a manner likely to impair thepipeline integrity

— the pipeline system demonstrates signs of deterioration likely to impair its integrity— the pipeline system is to be subjected to any modifications or repairs, which may impair its integrity— the pipeline is abandoned.

5.3.3.5 The pipeline certificate may be withdrawn if the customer fails to:

— comply with the operational procedures accepted by DNV— carry out the regular in-service inspection and maintenance programme according to the procedures

accepted by DNV— comply with any nonconformity report issued by DNV.— inform DNV as required by [5.3.3.3] and [5.3.3.4], and/or the pipeline integrity is assessed by DNV to be

or become impaired.

5.3.3.6 Once a nonconformity report is issued by DNV, the validity of the Certificate of Conformity isconditional upon successful completion of the required corrective action within a specified time limit. Thecustomer shall notify DNV upon the implementation of corrective actions, to enable DNV to verify the work.

5.3.3.7 A verification report shall be issued upon verification of any modification or repair of the pipelinesystem. No new pipeline certificate will be issued.

5.3.3.8 Pipeline systems that are temporarily out of service shall be subject to periodical inspections if thepipeline certificate is to be retained. The inspection requirements and re-commissioning procedures shall besubject to DNV’s acceptance prior to re-start.

5.3.3.9 If the conditions leading to withdrawal of the pipeline certificate no longer exists, the pipelinecertificate may be reinstated. The pipeline system may be subject to special assessment or monitoring prior toand following reinstating of the pipeline certificate.



App.A Guideline on selection of verification involvement level based on simplified verification planning –

APPENDIX A GUIDELINE ON SELECTION OF VERIFICATION INVOLVEMENT LEVEL

BASED ON SIMPLIFIED VERIFICATION PLANNING

A.1 General

A.1.1 General principles

A.1.1.1 The selection of the level of verification involvement depends on the criticality of each of the elementsthat have an impact on the management of risks to the pipeline system.

A.1.1.2 The verification process shall direct greatest effort towards those elements of the pipeline systemwhere the risk is highest and whose failure or reduced performance will have the most significant impact on:

— pipeline integrity— safety risks— environmental risks— business risks.

A.1.1.3 Suitable selection factors include, but are not limited to, the:

— overall safety objectives for the pipeline system— assessment of the risks associated with the pipeline and the measures taken to reduce these risks— degree of technical innovation in the pipeline system— experience of the contractors in carrying out the work— quality management systems of the owner and its contractors.

A.1.1.4 Due to the diversity of various pipeline systems, their contents, their degree of innovation, thegeographic location, et cetera, it is not possible to give precise instructions on how to decide what level ofverification involvement is appropriate for each particular pipeline system.

A.1.1.5 Therefore, guidance is given as a series of questions that should be answered when deciding theappropriate level of verification involvement for a pipeline system. This list is not exhaustive and otherquestions should be added to the list if appropriate for a particular pipeline system.

A.1.1.6 It must be emphasised that the contribution of each element should be judged qualitatively and/orquantitatively. Preferably quantified risk assessment data should be used to provide a justifiable basis fordecisions.

A.1.1.7 Depending of the stage of the project, the activities may not have taken place yet, in which case thequestions can also be posed in another form, i.e. “Is …. planned to be?”

A.2 Trigger Questions

A.2.1 Overall safety objective

— Does the safety objective address the main safety goals?— Does the safety objective establish acceptance criteria for the level of risk acceptable to the owner?— Is this risk (depending on the pipeline and its location) measured in terms of human injuries as well as

environmental, economic and political consequences?

A.2.2 Assessment of risk

— Has a systematic review been carried out to identify and evaluate the probabilities and consequences offailures in the pipeline system?

— Has this review judged the contribution of each element qualitatively and quantitatively and used, wherepossible, quantified risk assessment data to provide a justifiable basis for any decisions made?

— Does the extent of the review reflect the criticality of the pipeline system, the planned operation andprevious experience with similar pipeline systems?

— Does this review identify the risks associated with the operation of the pipeline system and with the healthand safety of personnel associated with it or in its vicinity?

— Has the extent of the identified risks been reduced to a level as low as reasonably practicable by means ofone or both of:

— reduction in the probability of failure— mitigation of the consequences of failure?

— Has the result of the systematic review of the risks been measured against the owner’s safety objective?



App.A Guideline on selection of verification involvement level based on simplified verification planning –

— Has the result of this review been used in the selection of the appropriate verification involvement level?

A.2.3 Technical innovation

— Has the degree of technical innovation in the pipeline system been considered?— Has it been considered that risks to the pipeline are likely to be greater with a high degree of technical

innovation than with a pipeline designed, manufactured and installed to well-known criteria in well-knownwaters?

— Have factors been considered in the selection of the appropriate level of verification involvement such as:

— degree of difficulty in achieving technical requirements— knowledge of similar pipelines— effect of the new pipeline on the surrounding area?

A.2.4 Contractors’ experience

— Has the degree of risk associated with the pipeline system been considered where design, construction orinstallation contractors are inexperienced?

— Has the degree of risk been considered where the contractors are experienced but not in similar work?— Has the degree of risk been considered where the work schedule is tight?

A.2.5 Quality management systems

— Have all parties involved in the pipeline system implemented an adequate quality management system toensure that gross errors in the work are limited?

— Do these parties include the:

— owner— design contractor— construction contractors— installation contractor— operator?

— Do the factors considered when evaluating the adequacy of the quality management system include:

— whether or not an ISO 9001 or equivalent certified system is in place— results from external audits— results from internal audits— experience with contractors’ previous work— project work force familiarity with the quality management system?



App.B Generic description of project sub-phases –

APPENDIX B GENERIC DESCRIPTION OF PROJECT SUB-PHASES

B.1 General

B.1.1 Introduction

B.1.1.1 A great deal of confusion can occur in projects over the precise definition of the various project phases.The terms are not, by themselves, important provided that everybody working on a particular project has aconsistent understanding of the definitions of the project sub-phases.

B.1.1.2 Some examples of descriptions of project sub-phases or milestones are given below. Thesedescriptions are not intended to be universal definitions, but are given as suggestions as to how particularproject specific definitions may be formulated.

B.2 Initial studies

B.2.1 Feasibility study

B.2.1.1 A feasibility study is a study directed at evaluation of the feasibility of one or more concepts.

B.2.1.2 The feasibility study is an evaluation of one or more proposed technical concepts against project costand schedule. It should identify special technical problems and indicate the solution or solve these to the degreenecessary to confirm the feasibility of the project cost and schedule.

B.2.1.3 The feasibility study shall address all essential cost and schedule aspects, and should conclude on whatthe most uncertain factors are and how they should be approached. It should preferably also address aspectssuch as environmental impacts, special legislation etc. that are peripheral to pipeline integrity.

B.2.2 Concept study

B.2.2.1 A concept study is a design made to establish the main dimensions and data of the pipeline.

B.2.2.2 These include, for example, diameter, wall thickness, design pressure segmentation, stabilityrequirements, material type, corrosion protection and operation philosophy. Other aspects includeestablishment of a route corridor and identification of possible needs for major intervention works and/or(additional) surveys. In short, the study has to establish the basic parameters for the work to be performed inthe next stages of design and a means for more detailed cost estimation and possibly comparison of a numberof concepts detailed to the same level.

B.2.2.3 It is expected only to indicate the preferred/possible methods or solutions of how to solve landfallzones, connection, installation, dropped object/trawl protection, expansion, major intervention etc. On thisbasis it is expected that the concept study documentation identifies how far the design has reached, what needsto be further detailed/investigated and how the designer foresees the use of the given information as part of thesubsequent design.

B.3 Design

B.3.1 FEED / Basic design

B.3.1.1 Basic design is a design made to establish the main dimensions and data of the pipeline to a level whereit is possible to make a detailed cost estimate and to place fabrication orders without taking any significanteconomic risk.

Guidance note:

The design phase is typically be split into FEED-phase, basic design and detail design. For each design phase, thesame design tasks are repeated, but to a successively increasing specific and detailed level.


B.3.1.2 The following should be defined; approximate route, diameter, wall thickness, design pressuresegmentation if applicable, stability requirements, isolation/cooling requirements, corrosion protection,material type and total length of required linepipe, type and number of buckle arrestors, number and depth ofcrossings, required seabed preparations, landfall design, dropped object/trawl protection requirements, numberand type of tie-ins and installation requirement, pre-commissioning and commissioning philosophies, safetysystems and operation philosophies.

B.3.1.3 On this basis, it is expected that a large part of the basic design documentation will be the final design



App.B Generic description of project sub-phases –

documentation and that it identifies what needs to be further detailed/investigated and how this shall be doneby the designer.

B.3.2 Detail design

B.3.2.1 Detail design means the finalisation of design. It can entail all stages of design, as it does notnecessarily have to be preceded by another distinct phase. It shall address all design issues for all items of thepipeline system and finalise all the specifications for the subsequent production phases.

B.4 Other phases

B.4.1 General

B.4.1.1 Descriptions of other project phases, such as construction (manufacturing, fabrication, installation andpre-commissioning), commissioning and operations are not given, as there is rarely any confusion of theirmeaning or extent.



App.C Examples of verification and certification documents –

APPENDIX C EXAMPLES OF VERIFICATION AND CERTIFICATION DOCUMENTS

C.1 General

C.1.1 Introduction

C.1.1.1 This appendix includes example forms for use by DNV relating to verification and certificationservices pertaining to pipeline systems.

C.1.1.2 The following forms are included:

— certificate of conformity— statement of conformity— verification comments sheet— audit report— visit report.




C.1.2 Certificate of conformity

Certificate No.:

DET NORSKE VERITAS

CERTIFICATE OF CONFORMITY

Owner:

Name of system/installation:

Location:

Description:

Main Operational Limitations:Pressure: Temperature: Service:

THIS IS TO CERTIFY:That the above mentioned system/installation has been verified, by appropriate methods, to comply with the requirements of

, for the main operational limits stated above, and further outlined in the Reference documents listed below.

Certification Involvement:The certification of the above mentioned system/installation has been performed in accordance with DNV Offshore Service Specification for Cerification of , DNV-OSS-3 with the detailed scope of work described in the Reference documents mentioned below.

The certification of the above mentioned system/installation has included:- (list of scope)

The detailed scope of work is described in the appended DNV Verification report.

Validity:This certificate is valid on the date of issue.

This certificate is not valid for systems/installations which are subject to classification by DNV.

Reference documents: (appended)

Issued at (place) on (yyyy-mm-dd)

for Det Norske Veritas AS

(name)

Project Sponsor

DET NORSKE VERITAS AS, Veritasveien 1, NO-1322 Høvik, Norway, Tel.: +47 67 57 99 00, Org.No. NO 945 748 931 MVA. www.dnv.com

Form No.: VER 02a Issue: 2013-10 Page 1 of 1

ILLUSTRATION ONLY

system/installation has been verified, by appropriate methods, to comply with the requirements of system/installation has been verified, by appropriate methods, to comply with the requirements of , for the main operational limits stated above, and further outlined in the Reference documents listed below., for the main operational limits stated above, and further outlined in the Reference documents listed below.

The certification of the above mentioned system/installation has been performed in accordance with The certification of the above mentioned system/installation has been performed in accordance with Specification for Cerification of , DNVSpecification for Cerification of , DNV OSSmentioned below.mentioned below.

The certification of the abovThe certification of the abov(list of scope)(list of scope)

This picture is provided solely for illustration. It

may deviate somewhat from the current version of th

e illustrated form


The certification of the above mentioned system/installation has been performed in accordance with The certification of the above mentioned system/installation has been performed in accordance with with the detailed scope of work described in the Reference documents with the detailed scope of work described in the Reference documents

e mentioned system/installation has included:e mentioned system/installation has included:

The detailed scope of work is described in the appended DNV Verification report.The detailed scope of work is described in the appended DNV Verification report.

Validity:Validity:




C.1.3 Statement of conformity

Statement No:

DET NORSKE VERITAS

STATEMENT OF CONFORMITY

Owner:

Name of system/installation:

Location:

Description:

Main Operational Limitations:Pressure: Temperature: Service:

THIS IS TO VERIFY:That the above mentioned system/installation has been verified, by appropriate methods, to comply with the requirements of

, for the main operational limits stated above, and further outlined in the Reference documents listed below.

Verification Involvement:The verification of the above mentioned system/installation has been performed in accordance with DNV Offshore Service Specification for Verification of , DNV-OSS-3 with the detailed scope of work described in the Reference documents mentioned below.

The verification of the above mentioned system/installation has included:- (list of scope)

The detailed scope of work is described in the appended DNV Verification report.

Validity:This statement is valid on the date of issue.

Reference documents: (appended)

Issued at (place) on (yyyy-mm-dd)

for Det Norske Veritas AS

(name)

Project Sponsor

DET NORSKE VERITAS AS, Veritasveien 1, NO-1322 Høvik, Norway, Tel.: +47 67 57 99 00, Org.No. NO 945 748 931 MVA. www.dnv.com

Form No.: VER 01a Issue: 2013-10 Page 1 of 1

ILLUSTRATION ONLY


The verification of the above mentioned system/installation has been performed in accordance with The verification of the above mentioned system/installation has been performed in accordance with Specification for Verification of , DNVSpecification for Verification of , DNV-OSSmentioned below.mentioned below.

The verification of the above mentioned systThe verification of the above mentioned syst(list of scope)(list of scope)

This picture is provided solely for illustration. It

may deviate somewhat from the current version of th

e illustrated form


The verification of the above mentioned system/installation has been performed in accordance with The verification of the above mentioned system/installation has been performed in accordance with with the detailed scope of work described in the Reference documents with the detailed scope of work described in the Reference documents

The verification of the above mentioned systThe verification of the above mentioned syst

The detailed scope of work is described in the appended DNV Verification report.The detailed scope of work is described in the appended DNV Verification report.

Validity:Validity:




C.1.4 Verification comments sheet




C.1.5 Audit report




C.1.6 Visit report



App.D Detailed scope of work tables for verification and certification –

APPENDIX D DETAILED SCOPE OF WORK TABLES FOR VERIFICATION

AND CERTIFICATION

D.1 General

D.1.1 Introduction

D.1.1.1 This appendix gives the format of the detailed scope of work tables that should be made for eachparticular project.

D.1.1.2 The detailed project-specific scope of work tables for the chosen level of verification involvementshould be based on these tables. For pipeline project scenarios or components not covered in this Appendix,similar tables with the same degree of details shall be made.

D.1.1.3 If any of the activities are moved from one phase to another, then this must be identified in the tablewhere it is removed. Similarly, the detailed table for the phase to where it is moved shall be amended.

Guidance note:

Typically, contractual boundaries may give natural splits of activities between phases. However, then it is even moreimportant to ensure that there is traceability as to which phases what activity belong and that this is conveyed to allinvolved parties.


D.2 Description of terms used in the scope of work tables

D.2.1 General

D.2.1.1 The following abbreviations and definitions have been used:

— X is part of scope; attendance at meeting, issue report, etc.— A is Audit— S is Surveillance— I is For Information— R is Review.

D.2.1.2 These abbreviations are DNV’s preferred terms and should be used in DNV-generated documents.However, other terms, for example monitoring or witnessing, may be used by DNV if these are the termscommonly used in documents, such as Inspection and Test Plans, generated by others. In that case, it isexpected that these other terms are defined in these documents.

D.2.2 Audit

D.2.2.1 Systematic, independent and documented process for obtaining audit evidence and evaluating itobjectively to determine the extent to which audit criteria are fulfilled. (ISO 9001: 2008).

Guidance note:

This activity differs from the Surveillance by being focused on the adherence to and completeness and robustness ofthe procedures and not on the actual result of the procedure (although this is not ignored). Further, the audit isnormally a ‘one-off’ activity as opposed to the continuity in monitoring.


D.2.3 Review

D.2.3.1 Systematic examination of reports and documentation. The depth of review will depend on the type ofdocument, any independent analyses/calculations performed by DNV, project phase and the level ofverification involvement. In principle, it is the solutions for the design, construction and operation elementsdescribed in the documents that shall be verified.

D.2.3.2 The documents shall be divided into verification documents and reference documents. Verificationdocuments are the documents DNV shall verify. Reference documents are the documents against which theverification documents are verified. DNV may rely on the information in the reference documents and shallhave no obligation to review, evaluate or verify this information. DNV may notify the customer of an error ina reference documents, however, this does not mean that DNV reviewed, evaluated or verified the referencedocument.




D.2.3.3 The following shall be used to describe the extent of the examination if not otherwise specifically

defined:

Guidance note:

Dependent on the project phase and kind of document, a comprehensive review (R2) may constitute review of details

of the document, and/or a verification of the interaction between conclusions from different documents and the totality

of the design.

Review of production records does not guarantee their correctness. It is a confirmation to DNV that the manufacturer

and/or sub-contractor has performed the required activity and issued a report.


D.2.3.4 Reports that are reviewed by DNV shall, unless otherwise agreed, not be signed and stamped.

D.2.4 Surveillance

D.2.4.1 Continual monitoring and verification of the status of an entity and analysis of records to confirm thatspecified requirements are being fulfilled.

Guidance note:

Other commonly used terms for surveillance are monitoring or witnessing.


D.2.4.2 The amount of work involved in surveillance is not described in detail in the tables. This shall be partof the final contractual scope of work which shall define the frequency of surveillance based on the overallsurveillance and the quality control performed by other parties as well as DNV’s experience.

D.2.4.3 The following shall be used to describe the frequency if not otherwise specifically defined:

— S1 = Surveillance on a visit basis, e.g. once per week

— S2 = Surveillance frequency minimum once per day

— S3 = Surveillance frequency minimum once per shift.

Guidance note:

These surveillance frequencies should be modified to correspond with production work flow.


D.3 Overall project management

D.3.1 General

D.3.1.1 The project quality management system documentation shall be available at the early stages of theproject, preferably before design is underway, to ensure that the necessary controls are in place.

D.3.2 Detailed scope of work for overall project management

D.3.2.1 A detailed scope of work for verification the overall project management at different levels ofinvolvement is given in Table D-1.

— I = for information only

— R1 = for review of principles and general aspects, spot checks of input/output data

— R2 = for comprehensive review.

Table D-1 Overall Project Management

Item DescriptionLevel of involvement

Low Medium High

1 Review of project quality management documentation R1 R2 R2

2 Audit of project quality management system - A A

3 Review of sub-contractor control - I R1

4 Review of interface controls - I R1

5 Review of methods of information flow - I R1




D.4 Design

D.4.1 General

D.4.1.1 For design verification a list similar to that given in Table D-2 and Table D-4 should be made forspecification of the minimum documentation requirement for each pipeline system.

D.4.1.2 The documentation of the items under General in Table D-2 shall be available at the early stages ofthe design. All the remainder of the documentation listed in Table D-2 and Table D-4 should be completed andbe made available to DNV, if requested, before a Statement of Conformity on the design can be issued.

D.4.2 Design verification

D.4.2.1 DNV-OS-F101 Sec.3 B105 and Sec.12 A104 specifies that the design and planning for a pipelinesystem shall cover all development phases including construction, operation and abandonment, and that alldocumentation requirements shall be reflected in a document register. The documentation to be produced andissues to be covered during design are given in DNV-OS-F101 Sec.12 B.

D.4.2.2 For certification of pipeline systems, the document register shall be made available to DNV foridentification of documents to be submitted for review for all project phases.

D.4.2.3 Table D-2 describes the issues to be verified and Table D-3 identifies the extent of independentanalyses/calculations included for the different levels of verification involvement.

D.4.2.4 Table D-4 and Table D-5 describe the issues to be verified in relation to flow assurance. This, if notbeing an integrity matter, is offered as an additional verification/certification service.

Guidance note:

If the pipeline system is designed for different pressures along the pipeline (segmented design) this should be reflectedin the verification scope of work regarding flow assurance, in addition to wall thickness, safety systems, etc.


D.4.3 Low level design verification

D.4.3.1 The initial Low level of design verification involvement consists of a detailed document review of thedesign basis, risk assessment/analysis documentation, quality management system documentation and (if theyexist) method or design philosophy documents. The presumed critical aspects of the project should beidentified by DNV from the initial review and conveyed to the customer for discussion and agreement oncorrect understanding.

D.4.3.2 The subsequent verification consists of document review of the calculations/analysis methods used toconclude the critical aspects. Other design documents are used as information and a few should be spot checkedfor confirmation of the quality control.

D.4.3.3 Verification of implementation of the conclusions from design calculations/reports into specificationsand drawings is not included.

D.4.4 Medium level design verification

D.4.4.1 Medium level of design verification involvement consists of a review of all main design documentsrelated to pipeline safety and integrity. Less critical aspects shall be spot checked. The review shall be detailedfor all critical aspects and independent checks shall be performed.

D.4.4.2 Verification of implementation of the conclusions from design calculations/reports into specificationsand main drawings shall be included on a spot check basis.

D.4.5 High level design verification

D.4.5.1 High level of design verification involvement consists of a full review of most of the produceddocuments related to pipeline integrity. The review shall be detailed for all critical aspects and independentchecks shall be performed.

D.4.5.2 Verification of implementation of the conclusions from design calculations/reports into specificationsand main drawings shall be included.

D.4.5.3 The main specifications shall also be checked for clearness and unambiguity.




D.4.6 Scope of work for design

D.4.6.1 Detailed scope of work for design is given in Table D-2, Table D-3, Table D-4 and Table D-5.

Table D-2 Pipeline integrity design


Low Medium High

General

1 Safety objective I I I

2Confirmation that the different contractors and sub-contractors’ quality systems meet the requirements of ISO 9001 (or approved equivalent system)

I R1 R2

3 Overall project organisation I I R1

4 Risk assessment and identification of critical aspects R2 R2 R2

5 Document register I I R1

Structural (main)

6 Design basis R1 R2 R2

7 Pipeline routing I R1 R2

8 Geohazards I R1 R2

9 3rd party interference assessment I R2 R2

8 Physical and chemical characteristics of fluid I I R1

9Materials selection including internal corrosion assessment (linepipe and components)

R1 R1 R2

10 Temperature/pressure profile (hydraulic/thermal analyses) I R1 R2

11 Wall thickness calculations R2 R2 R2

12 Stability R1 R2 R2

13 Pipeline expansion R1 R1 R2

14 Free span assessment R1 R2 R2

15 Upheaval buckling assessment R1 R2 R2

16 Lateral snaking assessment R1 R2 R2

17 Crossing design R1 R1 R2

18 Tie-in design, expansion spool calculations R1 R2 R2

19 Shore crossing assessment R1 R1 R2

20 Trawl interaction R1 R2 R2

21 Preliminary installation analyses R1 R2 R2

22 Trenching assessment - I R1

23 Spare philosophy - I R1

24 Fixed riser strength analyses R1 R2 R2

25 Fixed riser supports design - I R1

Structural (components)

26 Pig launcher/receiver design I R1 R1

27 Flange calculations I R1 R2

28Valves design I R1 R2

— Finite element analysis - I R2

29 T-joints, isolation joints, etc. I R1 R2

Structural drawings

30 Pipeline route drawings I R1 R1

31 Detailed pipeline crossing drawings I R1 R1

32 Platform layout drawings I R1 R1

33 Spool drawings I R1 R2

34 Pipeline protection drawings I R1 R2

35 Riser and riser clamp drawings I R1 R1




Linepipe and pipeline components (including welding)

36 Linepipe specifications R1 R1 R2

37 Welding specifications I R1 R2

38 Material take off/data sheets - I R1

Corrosion control systems and weight coating

39 Cathodic protection design report R1 R1 R2

40 Anode manufacturing and installation specifications I R1 R1

41 Coating manufacturing specifications I R1 R1

42 Field joint coating specification(s) I R1 R1

43 Corrosion monitoring system specification I R1 R1

44 Material take off/data sheets - I R1

Pipeline control and safety systems

45 Pipeline Control and Safety System Philosophy R1 R1 R2

46 Functional Safety Management Plan R1 R1 R2

47SIL (Safety Integrity Level) Allocation Report for the Pipeline Safety System

I R1 R2

48 Safety Requirements Specification I R1 R2

49 SIL Verification Report I R1 R1

50 Pipeline Control System (PCS) Functional Design Specification I R1 R1

Flow assurance, if not specified according to Table D-4 and Table D-5

51 Flow assurance, including internal corrosion assessment - I R1

Table D-3 Independent analyses/calculations for pipeline integrity design

Item Activity DescriptionLevel of involvement

Low Medium High

1Wall

thicknessWall thickness design calculations performed according to the applicable code

x x x

2

Stability

Spot check simplified calculations according to DNV-RP-F109

(x) x

3Dynamic non-linear FE analyses and assessment according to DNV-RP-F109

(x) x

4Free span

assessment

Spot check simplified calculations according to DNV-RP-F105

(x) x

5Free span assessment according to DNV-RP-F105 based on non-linear FE analyses

(x) x

6Expansion

Simple hand calculations assuming uniform input along the pipe

(x) x

7 Non-linear FE analyses (x) x

8Upheaval buckling

Simple calculations according to DNV-RP-F110 (x) x

9Non-linear FE analyses and assessment according to DNV-RP-F110

(x) x

10Lateral

buckling

Simple calculations according to DNV-RP-F110 (x) x


(x) x

12

Trawling

Simple calculations based on DNV-RP-F111 (x) x


(x) x

14

Installation

Static FE analysis and assessment of load effects (x) x

15Static and dynamic FE analysis and assessment of load effects

(x) x

16Spool

analysesFE analysis (x)

Table D-2 Pipeline integrity design (Continued)


Low Medium High




17Riser

analysesStatic FE analysis (of fixed risers only) (x) x

18Soil

assessmentCalculate pipe-soil characteristic to be used in other design calculations

(x) x

19Corrosion protection

Cathodic protection analysis according to applicable code and project specifications

(x) x

20Internal

corrosionAssessment of internal corrosion mechanisms (x) x

x = analysis/check should be included in the scope of work (as applicable)(x) = analysis/check should be included in the scope of work if the issue is identified as critical or highly utilised. Then

final decision of inclusion in scope of work will be a result of the document review of simple analysis.

Table D-4 Flow assurance design


Low Medium High

Design Basis

1 Pipeline topography I I R1

2 Pipe dimension, wall thickness, internal roughness I R1 R1

3 Insulation (thickness), trenching, embedment I R1 R1

4Material properties for soil, insulation, pipe, weight coating (thermal conductivity, heat capacity, density)

R1 R1 R1

5 Environmental conditions (meteocean data) I I R1

6 Production profiles (along the pipeline if segmented design) I I R1

7 Hydrocarbon composition, water cut, Equation of State (EoS) R1 R1 R1

8Operational requirements (arrival pressure and/or temperature, inlet pressure and/or temperature, cool-down time, slug sizes, WDP, HDP, capacity)

R1 R1 R1

9 Subsea templates/expansion loops I I R1

Steady State Thermo-hydraulic Report

10 Pipeline model I R1 R1

11 Pipe dimension/capacity of pipeline R1 R1 R1

12 Steady state pressure and temperature profiles R1 R1 R1

13 Flow regimes/slugging1) R1 R1 R1

14 Anode temperatures I R1 R2

15 Heating R1 R1 R1

16 Pipeline insulation system R1 R1 R2

17 Overall heat transfer coefficient R1 R1 R2

18 Hydrate analysis R1 R1 R1

19 Wax formation analysis R1 R1 R1

20 Sizing of methanol/glycol injection system R1 R1 R2

21 Effect of pipeline trenching and soil properties R1 R1 R2

Other Aspects

22 Sand accumulation R1 R1 R1

23 Erosion in piping system R1 R1 R1

24 Erosion of chokes and valves R1 R1 R2

25 Internal corrosion R1 R1 R1

26 Asphaltenes1), scale1), black/white/red powder2) I R1 R1

Transient Thermo-hydraulic Report

27 Terrain slugging1) R1 R1 R2

28 Shut-down of pipeline R1 R1 R1

29 Pressure surges/water hammer R1 R1 R1

30 Cool-down time at shut-down R1 R1 R2

31 Liquid hold-up during shut-down R1 R1 R1

Table D-3 Independent analyses/calculations for pipeline integrity design (Continued)


Low Medium High




32 Initial and warm start-up of pipeline R1 R1 R1

33Flowrate variation (ramp up and ramp down), packing and unpacking, blowdown)

R1 R1 R1

34 Heating of pipeline R1 R1 R2

35 Liquid surging at transient operation R1 R1 R1

36High integrity pressure protection system (HIPPS) or Pipeline Safety System

R1 R1 R1

37Update of Steady State Report and Transient Report based As-laid Survey.

I R1 R2

Notes:1) Applicable for multiphase pipelines2) Applicable for gas pipelines

Table D-5 Independent analyses/calculations for flow assurance


Low Medium High

1

Capacity/ pipe

dimension

Checking of input values, program system used and brief assessment of results

x x x

2Simple calculations based on empirical formulae/spread-sheet models

x x

3Independent calculations with appropriate multi-phase program

x

4 Pressure/ temperature

profiles

Anode temperature


x x x


x x

6Independent calculations with appropriate multi-phase program system

x

7Hydrate/ wax

analysis


x x x

8Independent calculations with appropriate process simulation and multi-phase program systems

(x) x

9Insulation

system

Over-all U-value,Effect of trenching


x x x


x x

11Independent calculations with appropriate multi-phase program

(x) x

12Corrosion assessment

Independent calculations with appropriate multi-phase program

(x)

13

Erosion assessment

Piping system, chokes

Independent calculations with appropriate program system

(x)

14Sand

accumulationIndependent calculations with appropriate multi-phase program

(x)

15Transient analysis

Start up, shut down, flow

rate variation, packing,

blowdown


x x x

16Independent calculations with appropriate transient multi-phase program system

(x) x

Table D-4 Flow assurance design (Continued)


Low Medium High




D.5 Construction

D.5.1 General

D.5.1.1 Construction consists of a number of different site activities and their associated documentation.

D.5.1.2 Table D-6 and Table D-7 give summaries of the scope of work tables included in this section forvarious construction activities.

D.5.1.3 For construction, verification lists similar to those shown hereafter shall be made for the specifics ofthe particular project.

D.5.2 Construction verification

D.5.2.1 DNV-OS-F101 Sec.12 C100-300 and D100-200 specifies the documentation to be submitted before,during and after construction.

D.5.2.2 For verification of pipeline systems construction activities are considered as:

— initial activities— inspection activities— final activities.

D.5.2.3 The initial activities include the review of procedures, attendance during qualification of procedures(e.g. MPQT, WPQT) and personnel (e.g. welders) and other start-up activities. The inspection activities are thesite or vessel attendance and the final activities are the (continuous) review of production results/records andthe completion of documentation and reports.

D.5.3 Low level construction verification involvement

D.5.3.1 For Low level verification involvement, the procedure review consists of a review of the constructionmanagement procedures and confirmation that the most important aspects of the main specifications have beenincluded in the procedures. For the qualification of procedures and personnel DNV will not attend the actualqualification, but shall review the results.

D.5.3.2 During the construction, DNV’s verification will be performed during site or vessel visits. Theverification shall focus on the critical items/aspects identified in the detailed scope of work tables.

D.5.3.3 The subsequent verification of the final activities should be by spot-checks of the production recordsincluding nonconformity logs, and results from audits, both contractors internal audits or audits performed byother parties.


Cool-down,heating

Independent calculations with appropriate transient multi-phase program system

(x) x


(x) x


Pressure surges,HIPPS


(x) (x) x


(x)


Terrain slugging,

liquid hold-up,

liquid surges


x x x


(x) x

x = analysis/check should be included in the scope of work (if relevant)(x) = analysis/check should be included in the scope of work if the issue is identified as critical or highly utilised. Then

final decision of inclusion in the scope of work shall be a result of the document review of simple analysis.

Table D-5 Independent analyses/calculations for flow assurance (Continued)


Low Medium High




D.5.4 Medium level construction verification involvement

D.5.4.1 For Medium level verification involvement, the procedure review consists of a detailed review ofconstruction management procedures. Other procedures and analysis documents shall be spot checked toconfirm that the most important aspects of the specifications have been included.

D.5.4.2 For the qualification of procedures and personnel DNV shall visit the main qualifications and reviewthe results.

D.5.4.3 During construction, DNV’s verification shall be performed by attendance at the main sites or vessels,normally limited to one shift per day. The verification should focus on the critical items/aspects as identifiedin the detailed scope of work tables.

D.5.4.4 Verification of the final activities shall be by review of the production records includingnonconformity logs, and results from audits, both contractor’s internal audits or audits performed by otherparties, from the main sites and spot checks of the same from other important sites.

D.5.5 High level construction verification involvement

D.5.5.1 For High level verification involvement, the procedure review consists of a detailed review ofconstruction management procedures. Other procedures and analysis documents, if relevant, shall be checkedto confirm that important aspects of the specifications have been included.

D.5.5.2 For qualification of procedures and personnel DNV shall attend the main qualifications, visit otherqualifications and review the results.

D.5.5.3 During construction, DNV’s verification shall be performed by full time (all shifts) attendance at themain sites or vessels and by visits to the other important sites. Verification should focus on the critical items/aspects as identified in the detailed scope of work tables.

D.5.5.4 Verification of the final activities shall be by review of the production records including thenonconformity logs, and results from audits, both contractors internal audits or audits performed by otherparties, from the main sites and spot checks of the same from other important sites.

D.5.6 Verification of work in progress

D.5.6.1 The monitoring by the owner during construction typically relates to the activities of the contractor.The monitoring of these activities by DNV relates not only to the contractor’s activities but also to themonitoring of these activities carried out by the owner.

D.5.6.2 The emphasis placed on the various activities in the verification plan varies depending on:

— any areas of concern revealed during design verification

— any areas of concern revealed during the audit of the owner’s or contractor’s quality management systems

— the progress of construction

— the findings of the contractor surveillance personnel.

D.5.6.3 Many contractors have adequate quality control systems and quality control departments, withcompetent personnel to perform, for example, inspection at mills and coating plants and specialist materialengineers competent to review and verify the performance of mills. In that case, not all verification work needsbe done by DNV personnel. Where applicable, the various inspections may be carried out by competent personsother than DNV personnel. In that situation DNV’s verification activities can be confined to:

— reviewing the competence of the contractor’s personnel

— auditing their working methods and their performance of that work

— reviewing the documents produced by them.

D.5.6.4 DNV personnel shall focus on areas where problems have occurred, or are considered likely to occur.Conversely, less effort is spent in areas where the likelihood of problems is considered lower.

D.5.7 DNV final verification report

D.5.7.1 The scope of work tables for construction normally include a last item entitled “Issue of DNV close-out report”. This item is not related to the production process, but intended as a reminder to the DNV (or others)inspection personnel that a final report of their verification activities is required to finish the work.




D.5.8 Detailed scope of work for construction

Table D-6 Construction summary table - fabrication

Table no. Table description

D-8 Steel making

D-9 Plate rolling

D-10 Linepipe production

D-11 Buckle arrestor fabrication

D-12 Coating application (external)

D-13 Isolating joint fabrication

D-14 Valves

D-15 Fabrication of pressure containing components, e.g. bends, Tees, pig-traps

D-16 Fabrication of non-pressure containing components e.g. anodes, concrete coating

Table D-7 Construction summary table - installation

Table no. Table description

D-17 Surveys; Pre-installation, As-laid, As-built

D-18 Qualification of lay barge, marine spread and installation equipment

D-19 Qualification of welding, NDT, field joint coating, procedures and personnel

D-20 Pipe storage yard

D-21 Fabrication of temporary equipment, e.g. A&R heads, pulling heads, test heads

D-22 Pipeline installation, incl. onshore pipe jointing and stalk welding as applicable

D-23 Seabed intervention and pipeline protection

D-24 Pre-commissioning

D-25 Pipeline control and safety system

Table D-8 Steel making


Low Medium High

Initial activities

1 Quality management system documents. - R1 R2

2Quality system audit / attend owner’s audit, at relevant manufacturers and sub-suppliers.

- - A

3 Specifications and procedures. R1 R2 R2

4 Attend kick-off meeting / Initial technical meetings. X X X

5 Verify performance and testing during qualifications. - X X

Inspection activities

6 Steel making and slab casting. S1 S1 S1

7 Slab inspection macro, non-metallic inclusion verification. - S1 S1

8 Slab identifications heat number. - S1 S1

9 Chemical analysis (ladle). - S1 S1

Table D-9 Plate rolling


Low Medium High

Initial activities

1 Quality management system documents - R1 R2

2Quality system audit / attend owner’s audit at relevant manufacturers and sub-suppliers

- - A

3 Specifications and procedures R1 R2 R2

4 Attend kick-off meeting / Initial technical meeting X X X

5 Verify performance and testing during qualifications - X X

6 Technical meetings - S1 S1





7 Slab re-heating, rolling and accelerated cooling processes S1 S2 S3

8Automatic ultrasonic inspection Calibration of equipment

S1 S2 S3

9 Visual inspection S1 S2 S3

10 Identification of test coupons S1 S2 S3

11 Loading and handling - S1 S1

Final activities

11Review of steel making and plate rolling manufacturing and testing records

R1 R2 R2

12 Issue of DNV close-out report X X X

Table D-10 Linepipe production


Low Medium High

Initial activities

1 Quality management system documents R1 R1 R2

2Quality system audit / attend owner’s audit at relevant manufacturers and sub-suppliers.

- - A






7 Material identification (pipe list) and tracking S1 S2 S3

8 Check pipe-forming and bevel S1 S2 S2

9 Welding and consumable handling S1 S2 S2

10 Weld repairs - S1 S2

11 View and interpret X-rays of repairs S1 S2 S3

12 Expanding, review record of expansion ratio - S1 S2

13 Check calibration of gauge R1 R2 R2

14 Hydrostatic test S1 S2 S3

15 End facing and squareness - S1 S1

16 View and interpret X-rays of pipe ends S1 S2 S3

17 Calibration of UT equipment R1 R2 R2

18 Automatic ultrasonic on pipe (longitudinal and transverse) S1 S2 S3

19 MPI - Equipment and sensitivity check R1 R2 R2

20 MPI - For pipe ends S1 S2 S3

21 MPI - After repair of pipe body by grinding S1 S2 S3

22 Dye penetrant - Check procedures R1 R2 R2

23 Dye penetrant - For pipe ends S1 S2 S3

24 Dye penetrant - After repair of pipe body by grinding S1 S2 S3

25 Wall thickness measurement after repair by grinding S1 S2 S3

26 Ultrasonic of pipe ends - Calibration of equipment R1 R2 R2

27Ultrasonic of pipe ends - Ultrasonic inspection of pipe-end (circumference). Both 90 ° and angle probes shall be used.

S1 S2 S3

28 Dimensional inspection S1 S2 S3

29 Visual external inspection, including cleanliness of inside pipe body S1 S2 S3

30 Weighing of pipe - S1 S1

31 Bevel protectors (if required) - S1 S1

32Marking - Check tracking records, Die stamp weld bevel, Paint mark internal, Colour code external

S1 S2 S3

33 Storage of finished pipes - S1 S2

Table D-9 Plate rolling (Continued)


Low Medium High




34 Cutting and identification of test coupons S1 S1 S2

35 Mechanical testing of production test pieces S1 S1 S2

36 Check material certificates R1 R2 R2

Final activities

37 Review of manufacturing and testing records R1 R2 R2


Note:This table defines the scope of work for the verification of longitudinally welded linepipe production. However, it may be used for seamless linepipe production by omitting all items related to the welding of the longitudinal seam.

Table D-11 Buckle arrestor fabrication


Low Medium High

Initial activities


2Quality system audit / attend owner’s audit, at relevant manufacturers and sub-suppliers

- - A






7 Material identification (Pipe list) R1 R2 R2

8 Check pipe- forming (forging), heat treatment (Q/T) and machining S1 S2 S2

9 Welding and consumable handling S1 S1 S2

9 Welding of pup-pieces (if required) - S1 S2

10 NDT S1 S2 S3

11 Check calibration of gauge R1 R2 R2

12 Hydrostatic test S1 S2 S3

13 Dimensional inspection as per specification. S1 S2 S3

14 Visual external inspection, including cleanliness of inside pipe body S1 S2 S3

15 Weighing of buckle arrestors - S1 S1


17Marking - Check tracking records, Die stamp weld bevel, Paint mark internal, Colour code external

- S1 S2

18 Storage of finished buckle arrestors - S1 S2

19 Removal and identification of test coupons S1 S2 S3

20 Mechanical testing of production test pieces S1 S1 S2


22 Loading and handling - S1 S2

Final activities

23 Review of manufacturing and testing Records R1 R2 R2


Table D-12 Coating application (external1)


Low Medium High

Initial activities


2 Quality system audit / attend owner’s audit,at relevant manufacturers and sub-suppliers

- - A


Table D-10 Linepipe production (Continued)


Low Medium High








7 Testing of coating materials R1 R2 R2

8 Examination of pipe prior to surface preparation S1 S2 S3

9 Examination of grit - S1 S1

10Pre-treatment - temperature, steel temperature humidity during pre-treatment, surface condition

S1 S1 S2

11

Visual inspection after blast-cleaning for cleaning standard, roughness, surface imperfections, contamination as dust and chlorides, cleanliness, segregation, repair and re-instalment of rejected pipes

S1 S2 S3

12Coating application - temperature, steel temperature humidity during painting application, surface condition

S1 S2 S3

13 Curing conditions - S1 S1

14 Paint thickness measurements S1 S2 S3

15 Final inspection and marking of coated pipes S1 S2 S3

16 Coating repair S1 S2 S3

17 Storage and handling of coated pipes - S1 S2

Final activities

18 Review of fabrication and testing records R1 R2 R2

19 Review of testing records R1 R2 R2


Note:

1) As internal coating and concrete coating do not affect the integrity of the pipe, the follow up should be limited to visit based (S1). Concrete coating is covered by Table D-16

Table D-13 Isolation joint fabrication


Low Medium High

Initial activities


2Quality system audit / attend owner’s audit,at relevant manufacturers and sub-suppliers

- - A






7Verify chemical composition for carbon steel to ensure sufficient hardenability

R1 R2 R2

8 Forging and heat treatment - S1 S2

9 Machining - S1 S2

10 Welding and consumable handling - S1 S2

11 NDT - S1 S2

12 Check calibration of gauge - R2 R2

13 Hydrostatic test - S1 S3

14 Hydraulic fatigue testing - S1 S2

15 Electrical resistant test - S1 S2

16 Dielectric strength test - S1 S2

17 Visual inspection - S1 S2

18 Dimensional inspection as per specification - S1 S2

Table D-12 Coating application (external1) (Continued)


Low Medium High




19 Weighing of insulating joints - S1 S2

20 Marking - S1 S2

21 Storage of finished insulating joints - S1 S2

22 Removal and identification of test coupons - S1 S2

23 Mechanical testing of production test specimen - S1 S2


25 Insulating joint conservation and storage - S1 S2

Final activities

26 Review of fabrication records and testing records R1 R2 R2

27 Issue of DNV Close-out report X X X

Table D-14 Valve fabrication (applies to all pressure containing parts)


Low Medium High

Initial activities


2Quality system audit/attend Owner’s audit at relevant manufacturers and sub-suppliers

- - A



5 Verify performance and testing during qualification - X X




R1 R2 R2

8 Forging/casting and heat treatment - S1 S2

9 Removal and identification of test coupons S1 S1 S2

10 Mechanical testing of production test specimen S1 S1 S2

11 Machining - S1 S1


13 NDT - S1 S2

14 Hydrostatic test (including check calibration of gauges) - S1 S2

15 Visual inspection - S1 S2

16 Dimensional inspection - S1 S2

17 Weighing of valve - S1 S2

18 Marking - S1 S2

19 Factory acceptance test (FAT) S1 S1 S2


21 Valve conservation and storage - S1 S2

Final activities

22 Review of fabrication records and testing records R1 R2 R2

23 Issue of DNV Close-out report X X X

Table D-15 Fabrication of other pressure containing components, e.g. bends, tees, pig-traps


Low Medium High

Initial activities


2Quality system audit / attend Owner’s audit,at relevant manufacturers and sub-suppliers.

- - A


Table D-13 Isolation joint fabrication (Continued)


Low Medium High









R1 R2 R2

8 Check forming (forging), heat treatment (Q/T) and machining - S2 S2


10 NDT - S2 S2

11 Check calibration of gauge - R2 R2

12 Hydrostatic test - S2 S2

13 Dimensional inspection as per specification - S2 S3

14 Visual external inspection, including cleanliness of inside pipe body - S2 S2

15 Weighing of final product - S1 S1


17Marking - Check tracking records, Dye stamp weld bevel, Paint mark internal, colour code external etc.

- S1 S1

18 Storage of final product - S1 S1

19 Cutting and identification of test coupons S1 S1 S3

20 Mechanical testing of production test specimen S1 S1 S3


Final activities


23 Issue of DNV close-out report - X X

Table D-16 Fabrication of non-pressure containing components, e.g. anodes, concrete coating


Low Medium High

Initial activities


2Quality system audit / attend owner’s audit, at relevant manufacturers and sub-suppliers

- - A

3 Specifications and procedures - R2 R2

4 Attend kick-off meeting / Initial technical meeting. - X X




7Verify chemical composition for carbon steel to ensure sufficient hardenability (if relevant)

- R2 R2

8 Welding and consumable handling, if applicable - S1 S2

9 NDT, if applicable - S1 S2

10 Dimensional inspection - S1 S2

11 Visual inspection, - S1 S2

12 Weighing of final product - S1 S2


14Marking - Check tracking records, Dye stamp weld bevel, Paint mark internal, colour code external etc.

- S1 S2

15 Storage of final product - S1 S2

16 Cutting and identification of test coupons - S1 S2

17 Mechanical testing - S1 S2

Table D-15 Fabrication of other pressure containing components, e.g. bends, tees, pig-traps (Continued)


Low Medium High




18 Check material certificates - S1 S2

Final activities



Table D-17 Surveys; pre-installation, as-laid, as-built


Low Medium High

Initial activities

1 Quality management system documents - I R1

2 Quality system audit / attend owner’s audit - - A

3 Specifications and procedures I R1 R2

4 Attend kick-off meeting / Initial technical meeting. - - X

5 Verify performance and testing during qualifications - - X


6 Pre-installation survey:

— Attend survey - - S1

— Review of survey reports R1 R1 R2

7 As-laid survey:

— Touch Down Monitoring (via installation vessel) - S2 S2



8 As-built survey:



Final activities

9 Issue of DNV close-out report - - X

Table D-18 Qualification of lay barge, marine spread and installation equipment


Low Medium High

Initial activities


2 Quality system audit / attend Owner’s audit - - A

3 Review of specifications and procedures R1 R2 R2

4 Attend kick-off meeting / Initial technical meeting - X X


5 DP Systems (Equipment Class II and III) - R1 S1

6 Anchoring System - S2 S2

7

Combined DP / anchoring system - tensioner tests (Pull-Stop):

— simulate barge pull and tensioner failures - S2 S2

— miscellaneous other redundancy testing during barge pull - S2 S2

8

Tension system test/ calibration:

— calibration R1 S2 S2

—testing of combinations of tensioner testing of single tension failures when running two or three tensioners

- S2 S2

—testing redundancy for single tensioners (brakes, tension motors, squeeze pressure system)

- S2 S2

— simulate main power loss - S2 S2

— simulate loss of signal power - S2 S2

Table D-16 Fabrication of non-pressure containing components, e.g. anodes, concrete coating (Continued)


Low Medium High




9

Abandonment and retrieval winch test/calibration:

— calibration R1 S2 S2

— simulate to test fail safe action - S2 S2

— simulate main power loss - S2 S2

— simulate loss of signal power - S2 S2

10

Test of friction clamps:

— test fail safe actions - S2 S2

— test clamps during barge pull - S2 S2

11 Test of remote operated buckle detector - S2 S2

12 Calibration of measuring devices used for configuration control R1 S2 S2

13 Stinger configuration and control devices R1 S2 S2

14 Maintenance records of critical/essential equipment - R1 R2

Final activities

15 Review of reports and documentation R1 R2 R2


Table D-19 Qualification of welding, NDT, field joint coating, procedures and personnel


Low Medium High

Initial activities




4 Attend kick-off meeting / Initial technical meeting - X X


5

Qualification of welding procedure (including repair):

— pWPS, WPQR, WPS R1 R2 R2

— welding equipment type and identification - S1 S2

— base material identification and certificates R1 R2 R2

— bevelling and bevel shape - S1 S2

— line-up and fit-up - S1 S2

— excavation and grinding of repair welds - S1 S2

—welding consumables identification and certificates, re-cycling of welding flux, mixture of new and re-cycled welding flux

- S1 S2

— preheat and interpass temperatures - S1 S2

— recording and control of welding parameters - S1 S2

— NDT of test welds S1 S2 S2

— removal and identification of test pieces S1 S2 S2

— mechanical testing S1 S2 S2

6

Welding consumable batch qualification:


— welding consumables identification and certificates R1 R2 R2

—re-cycling of welding flux, mixture of new and re-cycled welding flux

- S1 S2

— preheat and interpass temperatures - S1 S2

— control of welding parameters - S1 S2

— removal and identification of test pieces S1 S2 S2

— mechanical testing S1 S2 S2

7

Review of NDT procedures:

— final AUT procedure R1 R2 R2

— manual UT procedures R1 R2 R2

— MPI procedures R1 R2 R2

Table D-18 Qualification of lay barge, marine spread and installation equipment (Continued)


Low Medium High




8

AUT equipment qualification:

— qualification programme R1 R2 R2

— detailed system description and operation manual R1 R2 R2

—AUT procedure and reporting levels proposed for the qualification programme

- S1 S2

— sound velocity measurements (material from all plate mills) - S1 S2

— calibration block(s) dimensions and tolerances - S1 S2

—welding of test welds with defects and RT/UT to confirm presence of defects

- S1 S2

— scanning of SAW, GMAW and repair test welds - S1 S2

— AUT report and selection of areas to be sectioned - S1 S2

— sectioning and defect height/length/location determination R1 R2 R2

—statistical treatment of data and the defect sizing error determined

R1 R2 R2

— proposed threshold levels R1 R2 R2

9

Qualification of field joint coating procedures:

— procedure R1 R2 R2

— identification of materials - S1 S2

— surface preparation, temperature check - S1 S2

— application of coating - S1 S2

— testing of coating R1 S2 S2

10

Qualification of external coating repair procedure:





— testing of coating repair R1 S2 S2

11

Qualification of internal coating repair procedure:





— testing of coating repair R1 S2 S2

12 Welders’ qualification/certification records R1 R2 R2

13 Welding inspectors’ qualification/certification records R1 R2 R2

14 NDT operators’ qualification/ certification records R1 R2 R2

15 Coating inspectors’ qualification/certification records R1 R2 R2

Final activities



Table D-19 Qualification of welding, NDT, field joint coating, procedures and personnel (Continued)


Low Medium High




Table D-20 Pipe storage yard


Low Medium High

Initial activities

1 Specifications and procedures I R1 R2

2 Attend kick-off meeting / Initial technical meeting - - X


6

Inspection of pipes and key products at assembly yards before load out for transportation:

— pipe stacking heights in accordance with specification - S1 S1

— pipe ends for damage and end protectors - S1 S1

— condition of coating, degradation and damage - S1 S1

— pipe identification legible, complete and correct - S1 S1

— marking and proper segregation/quarantine of rejected pipe - S1 S1

— “repaired pipe” and “rejected pipe” records R1 R2 R2

— internal cleanliness of pipe during storage and prior to shipping - S1 S1

7

Pipe tracking system:

— Implementation of pipe tracking system - S1 S1

— Spot check on recording correctness - S1 S1

8 Receiving inspection of pipe returned from offshore: - S1 S1

9 Storage of repairable pipe in segregated area: - S1 S1

10

Repair of repairable pipe:

— repair according to accepted procedures - S1 S1

— acceptability of repair - S1 S1

— check of status for repaired pipe in the pipe tracking system - - R2

Final activities

11 Review of reports and documentation - R1 R2

12 Issue of DNV visit report - X X

Table D-21 Fabrication of temporary equipment, e.g. A&R heads, pulling heads, test heads


Low Medium High

Initial activities


2 Attend kick-off meeting / Initial technical meeting. - - X


3

Fabrication of temporary equipment:

— material and component certificates - R1 R2

— welding procedure qualification record (WPQR), WPS - R1 R2

— welder qualification - R1 R2

— machining - S1 S2

— welding and consumable handling - S1 S2

— NDT - R1 R2

— visual and dimensional inspection as per specification - S1 S2

— testing - S1 S2

— marking - S1 S2

Final activities






Table D-22 Pipeline installation, incl. onshore pipeline jointing and stalk welding as applicable


Low Medium High

Initial activities

1 Quality management system documents I R1 R2

2 Quality system audit / attend owner’s audit - A A

3

Installation engineering documents, specifications and procedures, as applicable:

— Analysis design brief documents R1 R2 R2

— Static pipelay analysis I R1 R2

— Dynamic pipelay analysis I R1 R2

— Abandonment and recovery analysis I R1 R2

— Vessel positioning / mooring analysis I R1 R2

— Shore pull analysis I R1 R2

— ECA (engineering critical assessment) I R1 R2

— Welding repair analysis I R1 R2

— Pipe pull analysis I R1 R2

— Pipe stacking analysis I R1 R2

— Welding procedures I R2 R2

— NDT procedures I R2 R2

— Field joint coating procedures I R2 R2

—Installation procedures; start up, normal lay, abandonment and recovery, lay down, shore pull

R1 R2 R2

— Failure Mode Effect Analysis (FMEA) and HAZOP studies I R1 R2

— Contingency procedures I R2 R2

— ITP (inspection and test plan) I R2 R2

4 HAZID-, HAZOP-meetings - X X

5 Kick-off meeting onboard installation vessel, at site - X X


5 All major equipment tested, qualified and ready for use R1 R2 R2

6 All procedures approved and available R1 R2 R2

7 Valid certification for welding, inspection and NDT personnel R1 R2 R2

8 Pipe tracking system – recording of data - S1 S1

9

Pipe unloading, receiving inspection and storage:

— pipe identification legible, complete and correct - S1 S2

—conditions of pipes acceptable according to specification, pipe ends undamaged and end protectors in place, coating without degradation and damage.

- S1 S2

—identification, marking, segregation and return onshore of rejected pipes

- S1 S2

— pipe stacking heights in accordance with specification - S1 S2

—certification, documentation and status of pipes in contractor’s tracking system

- S1 S2

10

Receipt of welding consumables and key products:

—condition acceptable according to specification, packaging undamaged

- S1 S2

— identification and certification of welding consumables S1 S1 S2

— storage conditions for welding consumables S1 S1 S2

11Repairs of damage to external and internal coating

— correct repair R1 S1 S2




12

Bevelling, cleaning, line-up and welding at welding stations:


— internal cleaning - S1 S2


—welding consumables identification, re-cycling of welding flux, mixture of new and re-cycled welding flux

S1 S1 S2

— welding procedures, control of welding parameters S1 S1 S2

— sequence of anode pipe and buckle arrestors - S1 S2

— pipe tracking system entries - - S1

13

Non-destructive testing:

— equipment calibration - S1 S2

— scanning S1 S1 S2

— interpretation of indications S1 S1 S2

— documentation filing S1 S1 S2

— equipment maintenance - S1 S2

14

Excavation, welding and NDT of repairs:

— excavation length and depth, grinding - S1 S2

— NDT of excavation - S1 S2

— welding consumables identification - S1 S2

— welding procedures, control of welding parameters - S1 S2

— NDT of repairs S1 S1 S2

15

Production tests:

— welding of production tests R1 S1 S2

— NDT of production tests R1 S1 S2

— marking and shipping - S1 S2

16

Field joint coating:

— material and procedure - S1 S2

— testing of field joint coating - S1 S2

Pipelaying activities

19 Monitoring and recording of laying parameters:

— vessel position - S1 S2

— DP system operation - S1 S2

— anchor pattern - S1 S2

— pull speed - S1 S2

— Tension, settings including dead band S1 S1 S2

— roller loads S1 S1 S2

— vessel trim and draft - S1 S2

— ramp configuration - S1 S2

— water depth - S1 S2

— pipeline catenary configuration - S1 S2

—touch down point monitoring; within route, curves,free spans, pipe supports, crossings, etc.

S1 S1 S2

— buckle detection - S1 S2

— operating limit condition parameters - S1 S2

20

Abandonment and recovery operations:

— removal of internal equipment - S1 S2

— welding of A&R head - S1 S2

— winch tension and wire length - S1 S2

— inspection of pipeline prior to resuming laying - S1 S2

Table D-22 Pipeline installation, incl. onshore pipeline jointing and stalk welding as applicable (Continued)


Low Medium High




21

Shore pull:

— verify adequate seabed preparation - S1 S2

— installation of pulling head - S1 S2

— pulling force - S1 S2

— tension and wire length - S1 S2

— twisting - S1 S2

— ROV monitoring - S1 S2

22

Tie-in operations:

— pre tie-in survey of seabed - S1 S2

— winch tension and wire length during lifting and lowering - S1 S2


—welding, consumables identification, welding procedures, control of welding parameters

- S1 S2

— Inspection, NDT - S1 S2

— field joint coating - S1 S2

— ROV survey on both sides of tie-in after lowering - S1 S2

Final activities:



Table D-23 Seabed intervention and pipeline protection

ItemDescription

Level of involvement

Low Medium High

Initial activities

1 Quality management system documents - I R1


3 Specifications and proceduresAttend Kick-off meeting / Technical meeting / HAZOP meeting

R1 R1 R2

4 - X X


5 Rock installation:

— Rock installation schedule R1 R1 R2

— Rock grading check - S1 S1

— Rock installation operations - S1 S1

— Pre- and post-installation surveys - S1 S1

6 Trenching:

— Trenching equipment monitoring system calibration - S1 S2

— Trenching trials, test trench - S1 S2

— Trenching operation parameters - S1 S2

— Operations monitoring - S1 S2

— Post trench survey - S1 S2

7Other intervention work; grout bags, concrete mattresses, boulder removal, dredging, etc.:

— Equipment. function testing, lifting certificates - - S1

— Operations monitoring - - S1

— Pre- and post-operation surveys - - S1

Final activities



Table D-22 Pipeline installation, incl. onshore pipeline jointing and stalk welding as applicable (Continued)


Low Medium High




Table D-24 Pre-commissioning


Low Medium High

Initial activities

1 Quality management system documents - I R



4 Attend Kick-off meeting / Technical meeting / HAZOP meeting - X X


5

Flooding, cleaning and gauging operations:

— Water sampling - S1 S2

— Inhibitor injection - S1 S2

— Pumping pressure and volume - S1 S2

— Gauge plate dimensional check R1 S1 S2

— Calliper pigging, if applicable - S1 S2

— Debris assessment - S1 S2

6

System pressure test:

— Instrumentation and equipment calibration certificates R1 R2 R2

— Pressurisation, pressure and temperatures log - S1 S2

— Air content measurements - S1 S2

— Pressure test / holding period - S1 S2

— Depressurisation - S1 S1

7

Dewatering and drying:

— Dewater pigging - - S1

— Drying, if applicable - - S1

Final activities



Table D-25 Pipeline control and safety systems


Low Medium High

Initial activities

1 Detailed Design Specification and Module Design Specifications I R1 R2

2 Verification test plans I R1 R2

3 FAT plans (if applicable) I R1 R2

4 Site validation plans I R1 R2

5 Proof tests plans I R1 R2

6 Functional Safety Management Plan for Operations and Maintenance R1 R1 R2


7 Witnessing of verification tests - S1 S3

8 Witnessing of FAT (if applicable) S1 S3 S3

9 Witnessing of site validation tests S1 S3 S3

10 Witnessing of proof tests S3 S3 S3

Final activities






D.6 Operation

D.6.1 General

D.6.1.1 Verification during operation is carried out by means of:

— audits

— reviews

— site visits.

D.6.2 Verification in operation

D.6.2.1 The documentation to be produced and issues to be covered during operation are given in DNV-OS-

F101 Sec.12 E100, F100 and F200.

D.6.2.2 The document register shall be made available to DNV for identification of documents for submission

for review.

D.6.2.3 For retention of pipeline certificate, the main activities and timing within a five (5) year cycle consist

of regular follow-up, yearly assessments and 5 yearly update of pipeline certificate.

D.6.2.4 Table D-26 describes the issues to be verified and Table D-27 to Table D-32 identify the extent of

DNV involvement included in the three levels of verification involvement.

D.6.2.5 Recommended practice for integrity management of submarine pipeline systems is given in DNV-RP-

F116.

D.6.3 Low level of verification involvement during operation

D.6.3.1 Low level verification involvement consists of general review of the main document(s) to check

compliance with design documentation.

D.6.3.2 Audit during repair and modification.

D.6.4 Medium level of verification involvement during operation

D.6.4.1 Medium level verification involvement consists of detailed review of the main document(s) to check


D.6.4.2 Audit attendance during commissioning, start-up of periodical survey, modification and repair

activities. For critical aspects, as identified by the requirement for maintenance of certificate, audit attendance

throughout the activities. Review of contractors' documentation of any survey/modification.

D.6.4.3 Audit attendance during normal operation. Spot check of operational records and assessments.

D.6.5 High level of verification involvement during operation

D.6.5.1 High level verification involvement consists of detailed review of the main document(s) to check


D.6.5.2 Audit attendance during commissioning, start-up of periodical survey, modification and repair

activities. For critical aspects, as identified by the requirement for maintenance of certificate, audit attendance

throughout the activities. Review of contractors' documentation of any survey/modification.

D.6.5.3 Audit attendance during normal operation. Detailed review of operational records and assessments.

D.6.5.4 Review of the main document(s) to check compliance with applicable codes and standards. Audit

attendance during start-up and performance of periodical survey, modification and repair activities. For critical

aspects, as identified by the requirement for maintenance of certificate, full attendance throughout the

preparations of and during the activities.

D.6.6 F 600 Scope of work for operation

D.6.6.1 Detailed scope of work for operation is given in Table D-27 to Table D-32 and is summarised in Table

D-26.




Table D-26 Summary Table - Operation

Table No. Table Description

D-27 Commissioning

D-28 Integrity management and Quality Systems

D-29 Risk Assessment and IM planning

D-30 Inspection, Monitoring, Testing

D-31 Integrity Assessment

D-32 Mitigation, Intervention and Repair

Table D-27 Commissioning


Low Medium High

Initial activities


2 Quality system audit / attend owner’s audit. - - A


4 Attend Kick-off meeting /Technical meeting / HAZOP meeting - X X


8 Filling of product/fluid - S1 S2

9

Base-line external survey (start-up inspection):



9

Base-line internal inspection (if applicable):

— Attend inspection, calibration of tool - - S1

— Review of inspection and assessment reports I R1 R2


Final activities

11 Issue of DNV visit report X X

12 Issue of DNV close out report X X X

Table D-28 Integrity Management (IM) and Quality System


Low Medium High

Identify and review of governance / management and planning

1 Design, Fabrication and Installation (DFI) document R1 R2 R2

2Philosophy documents (operation, inspection, maintenance and repair/emergency philosophies)

R1 R2 R2

3Supporting philosophy documents (reporting and communication, management of change, organization and personnel)

I R1 R2

4Integrity management system (PIMS) and interfaces between activities

I R1 R1

5 Main operating specifications and procedures R1 R2 R2

6 Audit of control room to review the day to day operation S1 S1 S2

Final activities

10 Issue of DNV visit report X X X

11 Input to annual assessment report X X X




Table D-29 Risk Assessment and IM Planning


Low Medium High

Risk Assessment review

1 Attend risk assessment meeting/workshop - - X

2 Risk Assessment reporting

— Risk assessment according approved specifications R1 R2 R2

— Documentation of that the risk assessment covers all items which failure may jeopardise the integrity of the pipeline system

I R1 R2

— For each item, documentation shall show that all threats have been identified and evaluated

I R1 R2

— Review that the risk assessments are properly documented and updated as appropriate, e.g. findings from integrity assessment included (inspection, monitoring and testing)

I R1 R2

Review of integrity management planning

3 Integrity management plan

— Review of integrity management plan (inspection, monitoring and testing) to confirm that the plans are updated to reflect the outcome of the risk assessments

R1 R2 R2

4 Inspection, monitoring and testing strategy R1 R2 R1

Final - Reporting


Table D-30 Inspection, monitoring and testing


Low Medium High

Review of Inspection plans and reports (external and internal inspection)

1 Inspection plans

— Long term and short term inspection plans R1 R2 R2

— Document that the pipeline system has been inspected according to plans

I R1 R2

— Deviations from inspection plans shall be properly documented and approved

I R1 R2

— Review that inspections are done and documented in accordance with approved procedures

I R2 R1

2 Inspection procedures I I R2

3 Site visits - S1 S1

4 Inspection reports

— Review that the results from the inspections been evaluated by qualified personnel.

— Implementation of findingsI R1 R2

Review of Monitoring & Test plans and procedures

5 Monitoring plans and procedures

— Documentation shall detail that the monitoring has been performed according to plans

R1 R1 R2

— Deviations from monitoring plans shall be properly documented and approved

I R1 R2

— Review that monitoring are done and documented in accordance with approved procedures

I R1 R2

— The results from the monitoring shall be evaluated by qualified personnel

I R1 R2

Review of testing (corrosion testing, function testing of valves, pig launcher/receiver etc.)

6 Test plans and procedures

— Testing performed according to plans shall be documented R1 R1 S1

— Deviations from test plans shall be properly documented and approved

I R1 R2

— Review that the testing has been done and documented in accordance with approved procedures

I R1 R2




— Results from the testing shall be evaluated by qualified personnel I R1 R2

Reporting



Table D-31 Integrity assessment


Low Medium High

Review of integrity assessment

1 Integrity assessment report

— Integrity assessment performed according to approved procedures shall be documented

R1 R1 R2

— Integrity assessment has been done and documented in accordance with approved procedures

I R1 R2

— Results from the integrity assessment shall be evaluated by qualified personnel

I R1 R2

Reporting


Table D-32 Mitigation, intervention and repair


Low Medium High

Review of mitigation (pressure change, corrosion inhibitors, inspection frequencies)

1 Procedures according to approved specifications I R1 R2

2 Implementation of procedures I I R2

Review of intervention

3 Procedures according to approved specifications I R1 R2

4 As built documentation I R1 R2

Review of repair

5 Repair strategy I R2 R2

6 Design reports R1 R1 R2

7 Procedures R1 R2 R2

8 Site attendance during execution - S1 S1

9 As built documentation R1 R2 R2

Reporting



Table D-30 Inspection, monitoring and testing (Continued)


Low Medium High



CHANGES – HISTORIC –

CHANGES – HISTORIC

Note that historic changes older than the editions shown below have not been included. Older historic changes(if any) may be retrieved through http://www.dnv.com.

October 2000 edition

Amendments April 2012

— The restricted use legal clause has been deleted from the front page.

Amendments October 2011

— A restricted use legal clause has been added on the front page.