es-l-60 rev2.1 spec for inspection of subsea pipelines

QATAR GENERAL PETROLEUM CORPORATIONSPECIFICATION FOR THE INSPECTION OF SUBSEA PIPELINES

UTILISING REMOTELY OPERATED VEHICLES

ES.L.60 -1- Issued 10/98 Rev.2.1

QGPC SPECIFICATION

FOR THE INSPECTION OF

SUBSEA PIPELINES

UTILISING

REMOTELY OPERATED VEHICLES

DOCUMENT PROFILE

DEPARTMENT

FACILITIES QUALITY ASSURANCE (QA)

DIVISION

ASSET INTEGRITY

AUTHOR: QAI/21DATE OF ISSUE: 26.10.98DOC. REF.: ES.L.60FILE REF.: ES.L.60.R2.1

REVISION LOG

2.1 26.10.98 Minor revisions QAI/21 QAI/21 QAI/3

2 08/97 Updated QAI/21 QAI A/QA

1 ‘95 Re issued for GTC 130/95 IEI/3 IEI IE

0 03/93 Initial Issue ENI/33 ENI ISE

Rev Date Reason For Issue ORIG CHK. APP.



ES.L.60 -2- Issued 10/98 Rev.2.1

FORWARD

THIS DOCUMENT HAS BEEN COMPILED IN ACCORDANCEWITH THE REQUIREMENTS OF BRITISH STANDARDS - BS45020STANDARDISATION AND BS5750 (8) QUALITY SYSTEMS FORSERVICES.

IN ACCORDANCE WITH THE REQUIREMENTS OF THESESTANDARDS, THIS SPECIFICATION WILL BE SUBJECT TOANNUAL REVIEW AND WHERE NECESSARY, "UPDATE" ON ORNEAR EACH ANNIVERSARY OF ISSUANCE.

THIS DOCUMENT SHALL BE UTILISED IN CONJUNCTION WITHTHE QGPC HYDROGRAPHIC SURVEY SPECIFICATION, ISSUEDBY ENC/4. THE HYDROGRAPHIC SURVEY REQUIREMENTS AREDESIGNED TO INTERACT AND COMPLIMENT EACH OTHER.

WHERE HYDROGRAPHIC SURVEY REQUIREMENTS DETAILEDBY ENF/2 SPECIFICATIONS, EXCEED THE MINIMUMREQUIREMENTS SPECIFIED IN THIS DOCUMENT, ENF/2SPECIFICATIONS SHALL APPLY.



ES.L.60 -3- Issued 10/98 Rev.2.1

TABLE OF CONTENTS

1 SPECIFICATION.............................................................................................................5

2 INTRODUCTION.............................................................................................................6

3 DEFINITIONS ..................................................................................................................7

3.1 ANOMALY...................................................................................................................................................73.2 BASE LINE SURVEY ....................................................................................................................................73.3 CONDITION MONITORING............................................................................................................................73.4 EMPLOYER..................................................................................................................................................73.5 EMPLOYER'S REPRESENTATIVE...................................................................................................................73.6 CONTRACTOR .............................................................................................................................................73.7 CONTRACTOR'S REPRESENTATIVE ..............................................................................................................73.8 CONTRACTOR'S EQUIPMENT .......................................................................................................................73.9 SERVICES....................................................................................................................................................73.10 POST LAY SURVEY .................................................................................................................................83.11 PIPELINE.................................................................................................................................................8

4 STANDARDS ....................................................................................................................9

4.1 AMERICAN STANDARDS..............................................................................................................................94.2 BRITISH STANDARDS ..................................................................................................................................94.3 CSWIP STANDARDS.................................................................................................................................104.4 DET NORSKE VERITAS STANDARDS..........................................................................................................104.5 RECOMMENDED PRACTICE .......................................................................................................................104.6 TECHNICAL NOTE .....................................................................................................................................104.7 ISO STANDARDS.......................................................................................................................................10

5 OBJECTIVES .................................................................................................................11

6 METHODOLOGY .........................................................................................................12

7 SCOPE OF WORK.........................................................................................................16

7.1 EXTERNAL SURVEY ..................................................................................................................................167.2 CATHODIC PROTECTION............................................................................................................................177.3 GEOGRAPHICAL SURVEY ..........................................................................................................................17

8 SURVEY TECHNIQUES ..............................................................................................18

8.1 NAVIGATION SYSTEMS .............................................................................................................................188.2 BATHYMETRIC SYSTEM ............................................................................................................................188.3 VIDEO PHOTOGRAPHIC SYSTEMS..............................................................................................................188.4 CATHODIC POTENTIAL SENSING SYSTEM..................................................................................................188.5 COLOUR STILL PHOTOGRAPHY SYSTEM....................................................................................................18

9 PERSONNEL ..................................................................................................................19

9.1 INSPECTION PERSONNEL...........................................................................................................................199.2 SURVEY PERSONNEL.................................................................................................................................199.3 ROV PERSONNEL .....................................................................................................................................209.4 ORGANIGRAM FOR 24 HOUR MANPOWER REQUIREMENTS.........................................................................21

10 SURVEY EQUIPMENT SPECIFICATIONS .............................................................22



ES.L.60 -4- Issued 10/98 Rev.2.1

10.1 ACCEPTANCE TRIAL.............................................................................................................................2210.2 PRIMARY POSITIONING SYSTEM EQUIPMENT........................................................................................2210.3 SUBSEA POSITIONING SYSTEM EQUIPMENT ..........................................................................................2210.4 NAVIGATION COMPUTER ......................................................................................................................2210.5 ROV SYSTEM.......................................................................................................................................2310.6 ROV CAPABILITIES ..............................................................................................................................2610.7 SURVEY SUPPORT VESSEL....................................................................................................................29

11 REPORTING REQUIREMENTS ................................................................................30

11.1 ANOMALY REPORTING SYSTEM............................................................................................................3011.2 ANOMALY CODES AND DESCRIPTIONS.................................................................................................3111.3 ACTION CODES AND DESCRIPTIONS .....................................................................................................3211.4 ANOMALY CODE DEFINITIONS..............................................................................................................3311.5 DAILY REPORT .....................................................................................................................................3511.6 DRAFT REPORT.....................................................................................................................................3511.7 FINAL REPORT......................................................................................................................................36

12 CONTRACTOR RESPONSIBILITIES .......................................................................46

13 ENVIRONMENT DATA ...............................................................................................47

13.1 WATER DATA.......................................................................................................................................4713.2 AIR DATA.............................................................................................................................................4713.3 CURRENT DATA ...................................................................................................................................4713.4 WAVE DATA.........................................................................................................................................4713.5 WIND DATA..........................................................................................................................................4813.6 EXTREME WATER DEPTHS (M).............................................................................................................4813.7 REFERENCE DATA ................................................................................................................................4913.8 SOILS DATA..........................................................................................................................................49



ES.L.60 -5- Issued 10/98 Rev.2.1

1 SPECIFICATION

THIS SPECIFICATION DETAILS AND DEFINES QATARGENERAL PETROLEUM CORPORATION'S, MINIMUMACCEPTABLE STANDARDS AND REQUIREMENTSFOR REMOTELY OPERATED VEHICLE (ROV)INSPECTIONS OF SUBMARINE PIPELINES ON BOTHNEW AND EXISTING PROJECTS



ES.L.60 -6- Issued 10/98 Rev.2.1

2 INTRODUCTIONQGPC operate in four fields in the Arabian Gulf, Idd El Shargi, Maydan Mahzam,Bul Hanine and North Field. Within each Southern sector field, subsea pipelinesare routed from satellite platforms to a main Production Station i.e. PS-1 (Idd ElShargi),PS-2 (Maydan Mahzam), PS-3 (Bul Hanine).

Inter-field NGL pipelines are routed between PS-1, PS-2 and PS-3. NGL exportpipelines are routed from PS-1 to onshore. Oil export pipelines are routed from PS-1, PS-2 and PS-3 to Halul Island.

North Field Alpha (NFA) lies 80 km offshore due North of Ras Laffan,Hydrocarbon Gas & NGL are transported to Mesaieed via two (2) Exportpipelines: a 12 inch Condensate and a 34 inch Gas.

All existing pipelines have been laid without trenching or burial, although someself burial may have occurred subsequently. The pipelines are fitted with corrosionand weight coating and are cathodically protected by sacrificial anode systemsconsisting of zinc or aluminium alloy anodes installed at varying intervals.

Pipelines range in diameter, from 4" to 48".



ES.L.60 -7- Issued 10/98 Rev.2.1

3 DEFINITIONS

3.1 AnomalyAny irregular or abnormal item or thing connected with or in close proximity to thepipeline.

3.2 Base Line SurveyThe "first" or primary inspection upon which all future inspections will bereferenced or measured.

3.3 Condition MonitoringAn inspection following the "first" inspection upon which deterioration oranomalous conditions are assessed.

3.4 EmployerQatar General Petroleum Corporation (QGPC) or its nominated representative.

3.5 Employer's RepresentativeAn appropriately qualified individual (Inspection Engineer with a minimum 5years ROV experience) appointed by the Corporation to direct and supervise thecontract works.

3.6 ContractorThe company engaged to perform the inspection work.

3.7 Contractor's RepresentativeAn appropriately qualified individual appointed by the Contractor to direct,supervise and liaise with the Corporation Representative in the performance of theservices.

3.8 Contractor's EquipmentAll appliances or things of whatever nature used directly or indirectly for theprovision of the services.

3.9 ServicesMeans all work to be performed and all the services to be rendered by theContractor, including but not limited to the provision of equipment and personnel.



ES.L.60 -8- Issued 10/98 Rev.2.1

3.10 Post Lay SurveyThe first or primary inspection conducted immediately the installation of a newpipeline confirming the installation and operating specifications detailed by theCorporation, have been met by the Contractor, thereby establishing 'base line' datafor future inspections.

3.11 PipelineThe use of the word pipeline in this document includes Risers & ancillaries,Spools, Doglegs, Valves and Pipelines inclusive of all associated appurtenances,from source to receiver at Highest Astronomical Tide (HAT).



ES.L.60 -9- Issued 10/98 Rev.2.1

4 STANDARDSReference in this specification to a code, standard or specification, unlessinconsistent with the context or subject matter, is a reference to the latest editionissued by the applicable authority or organisation.

4.1 American StandardsAPI - 1104 Welding of Pipelines and Related facilities

API - 1105 Welding of Pipelines and Related facilities

ANSI - B31.4 Liquid transportation systems for hydro-carbons,LPG, Anhydrous Ammonia and Alcohol’s.

ANSI - B31.8 Gas Transmission and Distribution piping systems

4.2 British StandardsBS 350 Conversion Factors & Tables.

BS 1192 (5) CAD - Construction Drawing Practice

BS 2856 Precise Conversion of Inch and Metric Sizes onEngineering Drawings

BS 3683 Glossary of Terms used in Non-DestructiveTesting.

BS 3889 Methods for Non-Destructive Testing of Pipes &Tubes.

BS 3920 Derivation and Verification of ElevatedTemperature Properties for Steel Products forPressure Purposes.

BS 4331 Methods for Assessing the Performance ofUltrasonic Flaw Detection Equipment.

BS 4778 Quality Vocabulary.

BS EN 45020 Standardisation.

BS 5493 Code of Practice for Protection Coatings on Iron& Steel Structures.

BS 5555 Specification for SI Units and Recommendationsfor the use of Their Multiples and of CertainOther Units.

BS 5750 Quality Systems.

BS 5775 Specifications for Quantities, Units and Symbols.

BS 6072 Magnetic Particle Flaw Detection.

PD 6493 Fusion Welded Joints, Flaws Acceptability.

BS 6918 Terms for Corrosion of Metals & Alloys.



ES.L.60 -10- Issued 10/98 Rev.2.1

BS 7165 Q/C Computer Software.

BS 7169 General Requirements for Marine NavigationalEquipment.

BS 7361 (1) Cathodic Protection Land & Marine Applications.

BS 8010 Pipelines

4.3 CSWIP StandardsCSWIP - 3.4U Underwater Inspection Controller

CSWIP - 3.3U ROV inspector

4.4 Det Norske Veritas StandardsRules for the design, construction and inspection of offshore structures andAppendices A to J.

Rules for Submarine Pipeline Systems.

4.5 Recommended PracticeRP 402 Coating Evaluation & Application.

RP B403 Monitoring of Cathodic Protection Systems.

4.6 Technical NoteTN-A-302 Site investigation for offshore Structures.

TN-B-III Corrosion Control of Equipment & PipingSystems Handling hydrocarbons.

TN-A-801 Guidelines for the Preparation of UnderwaterInspection Procedures.

TN-A-804 Guidelines for Qualification of RemotelyOperated Vehicles for Underwater Inspection.

4.7 ISO StandardsISO 8501 - 1 Preparation of Steel substrates before application

of paints and related products - Visual assessmentof Surface Cleanliness.



ES.L.60 -11- Issued 10/98 Rev.2.1

5 OBJECTIVES1. Ensuring the Corporation "inherits" from the Contractor a pipeline which meets

the design & installation specifications (Post Lay Survey) and remains "fit forpurpose", throughout its design life (Base Line & Condition Monitoring).

2. To locate and assess the position, routing, seabed topography and depth of thepipeline.

3. To visually inspect and assess the external condition & status of the pipelinescoating, stability, anodes, appurtenances and crossings.

4. To ascertain the adequacy of the cathodic Protection system along the entirepipeline.

5. To ascertain the extent, type and deleterious effect of debris both in contactwith and adjacent to the pipeline.

6. To investigate in detail, anomalies located in 1 to 5 above.

7. To ensure clear and concise reports are compiled on the condition and status ofthe pipelines, and that conclusive recommendations are made regardingremedial actions necessary to maintain their "Fitness for Purpose".



ES.L.60 -12- Issued 10/98 Rev.2.1

6 METHODOLOGYThe external condition of the pipelines shall be thoroughly investigated byutilisation of "type I" General Visual Inspection (GVI) methodology. Anyanomalies detected in this survey mode shall be subject to "type II" DetailedVisual Inspection (DVI). Dependent on the results obtained and only after,consultation with the onboard Corporation Representative "type III" Close VisualInspection (CVI) shall be utilised (see flowcharts on following pages).



ES.L.60 -13- Issued 10/98 Rev.2.1

GENERAL VISUAL INSPECTION (ROV)

Route Survey

Navigation/Bathymetric

External Condition

Video/Photography

Debris Survey Cathodic Protection Survey

– Seabed Topography

– Geographical Position

– Stability/Movement

– Pipeline Depth

– Marine Growth Status

– Coating Condition

– Appurtenance Condition

– Anode Status

– Crossing Status

– Freespan/Burial

– Non Metallic Debris

– Metallic Debris

– Direct Contact

– C.P. Profile

This chart details the minimum requirements for Type I General Visual Inspection (GVI)



ES.L.60 -14- Issued 10/98 Rev.2.1

DETAILED VISUAL INSPECTION (ROV)

Inform Corporation Rep.

On confirmation of anomalyand prior to starting survey

Anomaly Checks

Follow Anomaly plan set outin Section 11

Actions

Follow anomaly action planwith minimum of:

Reporting

Follow anomaly reportingsystem with minimum of

– Initial Findings

– Daily Summary

– Further Inspection asDirected (e.g. CVI)

– Anomaly Code

– Description

– Criteria

– Record Location

– Condition

– Dimensions

– Video coverage

– C.P. /photo’s asapplicable

– Record AnomalyChecks

– Record Actions

– Daily Summary

– RecommendRemedial Action

This chart details the minimum requirements for Type II Detailed Visual Inspection (DVI)



ES.L.60 -15- Issued 10/98 Rev.2.1

CLOSE VISUAL INSPECTION (ROV)

Conducted as directed byCorporation AuthorisedRepresentative, this may

include, but not limited to:

Inspection Monitoring Reporting

– Cleaning of area

– Stereo photography

– Debris removal bymanipulator

– Temporary remedialaction as directed

– Monitor movementover timed period,for leaks, RM, etc.

– Separate video coveragefor immediatesubmission

– Field report fortransmittal

– Photographs/videoprints for transmittal

– Recommend remedialaction

This chart details the minimum requirements for Type III Close Visual Inspection (CVI)



ES.L.60 -16- Issued 10/98 Rev.2.1

7 SCOPE OF WORK

7.1 External SurveyThe scope of work for "Post Lay", "Base Line" and "Condition Monitoring" is toexternally survey, the full length of the pipeline from riser to riser or from riser tothe High Water Mark (HWM) at the shore, to determine the following:-

1. The position, condition, status and water depth of all sections of pipeline &attachments/appurtenances inclusive of:-

• Risers

• Clamps

• Spools

• Doglegs

• Flanges

• Crossings

• Anodes

• Buried sections

• Damage

• Debris

• Supports/Anchors (Mechanical)

• Anomalies.

2. Stability of the pipeline, including location, length and maximum height of anyunsupported spans and crossovers.

3. The location, depth and length of any buried sections of pipeline.

4. Position of any deleterious debris and/or pipeline damage and seabed featureswithin 2 metres of either side of the pipeline.

5. Condition, dimensions (estimated length, width, height depth etc.) and status ofany anomalies detected.



ES.L.60 -17- Issued 10/98 Rev.2.1

7.2 Cathodic ProtectionTo carry out a remote cathodic potential survey giving a continuous trace ofpotential against kilometre point (K.P.) distance, as per the reporting requirements.

To measure the cathodic potential of pipeline anodes and flanges with directcontact probes (CP stab), as directed by employer.

7.3 Geographical SurveyIn order to achieve the detailed objectives the inspections will record the positionof the pipeline route.

The seabed topography and pipeline inclination, shall be continuously delineatedthroughout the survey, utilising a Dual Head Scanning Sonar (DHSS) at 50 metreintervals.



ES.L.60 -18- Issued 10/98 Rev.2.1

8 SURVEY TECHNIQUESThe survey techniques detailed below, shall apply to all three inspectionrequirements.

• Post Lay

• Baseline

• Condition Monitoring

The survey shall be carried out using the following techniques:-

ROV: The surveys shall be carried out using a remotely operated vehicle (ROV),Topside support package and dedicated Survey vessel.

8.1 Navigation SystemsThe pipeline position shall be surveyed, using an accurate navigation system asdescribed in the current revision of survey specification F2-SUR-002 to fix theposition of the vessel, and a subsea acoustic tracking system to fix the position ofthe ROV relative to the vessel (digiquartz or equivalent).

8.2 Bathymetric SystemThe depth of the seabed at the pipeline shall be determined using a high resolutionbathymetric system and calculated for chart datum.

8.3 Video Photographic SystemsPipeline and seabed status, debris location and damage/anomaly surveys shall bedetermined using a colour video system, utilising a Silicon Intensified Target (SIT)system.

8.4 Cathodic Potential Sensing SystemThe pipeline field gradient and pipeline potential shall be measured using acathodic protection potential meter (probe) referenced to a remote cell.

8.5 Colour Still Photography SystemColour still photographs shall be obtained of all significant damage, features oranomalous items located by the video survey, as detailed in the reportingrequirements.



ES.L.60 -19- Issued 10/98 Rev.2.1

9 PERSONNELFor the survey of the pipeline, the Contractor shall provide and maintain sufficientpersonnel to carry out effective operations, as dictated by the corporation.

Résumé’s of all dedicated vessel staff, proposed to be used by the contractor, willbe submitted to QGPC Marine department for approval one month prior to the startof the contract.

The Contractor shall ensure, as a minimum that all operating personnel hold arelevant discipline qualification with a minimum of three (3) years provenexperience, within the subsea environment. Proof that the operating personnelmeet these requirements shall be provided to the employer one month prior to thestart of the contract.

It is a mandatory requirement, that ALL personnel possess a good command ofboth written and spoken English.

It is a mandatory requirement that the following personnel hold the requirementsdetailed below:-

9.1 Inspection Personnel

9.1.1 Inspection Co-ordinator / Inspection Engineer

CSWIP 3.3u or 3.4u and a minimum 3yrs ROV pipeline inspection experience.

9.1.2 Photographic Technician

Certificate in photography with 3 years experience.

9.1.3 Technical Author

Diploma in Mechanical Engineering, Minimum 5 years Subsea experience. 2 yearscomputer experience.

9.1.4 Data Recorder

CSWIP 3.3u or 3.4u, 1 year ROV pipeline inspection experience.

9.2 Survey Personnel

9.2.1 Party Chief

Degree in Survey or R.I.C.S. in Hydrographic Survey. 10 years Subsea experience,with suitable ROV pipeline survey experience. 2 years computing experience.

9.2.2 Senior Surveyor

Degree in Survey. 5 years survey experience. 2 years ROV pipeline surveyexperience.



ES.L.60 -20- Issued 10/98 Rev.2.1

9.2.3 Surveyor

Diploma in Survey. 2 years survey experience.

9.2.4 Survey Technician

HNC/HND in Electronics with 3 years experience. 1 year survey systemsexperience.

9.3 ROV Personnel

9.3.1 ROV Supervisor

Formal Qualification in Electrical or Mechanical Engineering. 6 years ROVexperience. 2 years experience as a supervisor. 2 years pipeline inspectionexperience. 3 years ROV experience.

9.3.2 ROV Pilot/Technician

Recognised trade qualification in relevant discipline. 1 year pipeline inspectionexperience

9.3.3 CP Engineer

Suitably qualified and experienced in the maintenance of CP systems for ROV's.



ES.L.60 -21- Rev.1/97

9.4 Organigram for 24 hour manpower requirements

Offline Inspection EngineerTechnical Author

On line data recorderCP Engineer

Offline Inspection EngineerTechnical Author

On line data recorderCP Engineer

Offline Surveyor (1)Offline Surveyor (2)

Survey Technician (1)

Online Senior Surveyor

Offline Surveyor (3)Offline surveyor (4)

Survey Technician (2)

Online Party Chief

Inspection Co-ordinator

ROV Pilot (1)ROV Pilot (2)

ROV Supervisor

ROV Pilot (3)ROV Pilot (4)

ROV Supervisor

Project Manager Vessel Captain

CORPORATE REPRESENTATIVE



ES.L.60 -22- Issued 10/98 Rev.2.1

10 SURVEY EQUIPMENT SPECIFICATIONSThe contractor shall provide details of his proposed equipment one month prior tothe start of the contract mobilisation, and this shall be subject to Corporationapproval. In general, minimum requirements shall be as outlined below:-

10.1 Acceptance TrialPrior to the commencement of the Contract, the Contractor will be required toprove the capability of his equipment and personnel by means of a trial inspectionon a selected section of QGPC pipeline (Approximately 1km in length). This trialwill be conducted to the satisfaction of the Corporation Representative.

10.2 Primary Positioning System EquipmentPrimary navigation and position fixing, of the survey support vessel, shall be viatwo (primary and secondary) DGPS navigation systems as described in the currentrevision of F2-SUR-002. The systems shall be calibrated in accordance with F2-SUR-002. Navigation system tolerance for all operations shall be five (5) metres(Sigma = 2.5 metres).

Survey equipment specifications and procedures shall be in accordance withQGPC specification – F2-SUR-002, latest Edition as provided by ENF/2.

10.3 Subsea Positioning System EquipmentSubsea navigation and position fixing, of the ROV relative to the survey supportvessel, shall be via an acoustic underwater tracking system, (USBL) such asSIMRAD HPR. The subsea system shall be suitably calibrated offshore, in or nearthe survey area. Failure to suitably calibrate the system will result in non-commencement of the survey.

Survey equipment specifications and procedures shall be in accordance withQGPC Specification - Hydrographic Survey Specifications, latest edition asprovided by ENF/2.

10.4 Navigation ComputerThe Computer is to be interfaced to both the primary and subsea navigationsystems and capable of computing the position of the survey vessel and ROV inaccordance with "Computer Systems" requirements as per ENC/4 "HydrographicSurvey Specifications".

Full back-up shall be provided for the computer systems, all interfaces and otherequipment and software. Raw and calculated data are to be recorded and theavailable software should allow for real-time navigation, preparation of charts andpost-plotting.

Survey equipment specifications and procedures shall be in accordance withQGPC specification - Hydrographic Survey Specification, latest edition asprovided by ENF/2



ES.L.60 -23- Issued 10/98 Rev.2.1

10.5 ROV SystemThe Contractor shall provide a ROV system sufficient for the requirements of thesurvey, and as a minimum, consisting of:-

• ROV as specified in Section 10.5.1.

• ROV launch and recovery system as specified at 10.5.3.

• ROV Tether Management system (TMS),to include Tether, umbilical winchand all necessary Tether handling aids, as specified at 10.5.4.

• ROV operations control facility as specified at 10.5.5.

• Appropriate offshore spares holding and repair and/or replacementcapability & workshop as specified at 10.5.6.

• All equipment proposed by the Contractor shall be subject to Corporationapproval.

10.5.1 ROV Specifications

Depth capacity 300 MSW

Minimum speeds Forward > 3 Knots. Vertical > 1 Knot. Lateral >1.5 Knots.

Turning Rate per second 40 degrees

Pay load capacity Sufficient to conduct all operations covered in thisspecification successfully.

Propulsion system Capable of producing the minimum speedspecified at the maximum payload capacity.

Lighting Adequate to conduct all operational sequenceswith dimming circuits.

Camera configuration& optional extras Pan and Tilt mounted 1X Silicon Intensified

Target (SIT) monochrome video camera.

1x Ultra low light CCD monochrome videocamera.

2x Boom mounted CCD colour cameras.

1x Photosea 2000 35 mm stereo stills camera.

Pan and Tilt to be hydraulic type with +/- 80degree tilt +/- 180 degree pan capability

Auto functions Heading from high quality fluxgate.



ES.L.60 -24- Issued 10/98 Rev.2.1

Depth from pressure transducer.

Altitude from echo sounder

Heading park from inertial rate transducer.

Pitch park from pendulometer

Submersible flashing beacon.

27 kHz Pinger

Sonar Mesotech 971 colour or equivalent.

Range 5-100 m selectable

High Resolution Colour (HRC)

Sector or 360º scan selectable.

Scan rate selectable.

Mounted on pop up for 360 degree sonarcapability.

Data Telemetry Self diagnostic capability.

Microprocessor control of data transfer.

10.5.2 Available Options

• Power Upgrade Sufficient power to provide for all additionaltooling options.

• Manipulator Minimum 1. 5 function arm.

• Tool option Metal cleaning wheel.Disk cutting wheelSoft line cutter (1.5").Ultrasonic Wall Thickness Meter.

• Callout Tool Options Cable Cutter.Aquabrade cleaning system.

10.5.3 Launch & Recovery System (LARS)

"A" Frame Module Self erecting

Lift capability for on deck maintenance.

Rotation of TMS 180º

Dampened swing frame



ES.L.60 -25- Issued 10/98 Rev.2.1

Adequate outboard reach.

Main Winch Minimum 200 metre Umbilical storage.

Hydraulic operation.

Purgeable slip rings & fail-safe brakes.

Zone II operation capability.

Line load speed under load of approximately 40 metres per min.

Fitted intercom & pilots remote winch, frame &vehicle control.

It should be noted that davit type deployment systems are not consideredsuitable/safe for ROV deployment from "Mono-hull" vessels.

10.5.4 Tether Management System (TMS)

Description Operator controlled system with mechanical overcentre latches and visual/audible latch and capturedisplay in control van.

Digital readout capability (i.e. graphic display).

Minimum tether capacity 100mts.

Umbilical of armoured steel design.

The breaking strengths shall exceed the workingstrength by a minimum of four (4) times.

Neutrally buoyant weight in water.

Strength member of Braided Kevlar or equivalent.

10.5.5 Control Cabin

Minimum Size Length : 6 metres.

Width : 2.5 metres.

Height : 2.5 metres.

Zone II rated with air conditioner

Internal Airlock.

Power distribution housing.

Power source requirements to be specified byContractor and generator to be supplied whereinadequacies exist.



ES.L.60 -26- Issued 10/98 Rev.2.1

Control Console Joystick type vehicle control with motion control,thumb switch for TMS & still cameras.

Rack System, with Quad video splitter, DisplayingDHSS, Top, Left and Right side of pipe.

VDU graphic display Monitor with ROV statuscontinuously shown inclusive of fault and vitalsystem alarms.

Sufficient HQ SUPER VHS video recorders withfull laser printer facilities, to ensure one full setplus backup.

Multi channel video switcher.

Video character Generator: Symbol, numeric &alphabetic.

Sonar display.

Sufficient High resolution monitors; withminimum 1 x full real time "As Recorded"Monitor.

Display Display requirements include - Real Date, time,heading, KP roll, UTM co-ordinates, Depth,Altitude, CP potential, Dive No and Pipelineidentifier.

Communication Full two way communication between winch,bridge, survey room, Corporation Representativeand Project Manager and Work Deck.

10.5.6 Workshop/Spares Room

Spares Complete set of operational spares & repairequipment.

Workshop Complete workshop facility for systemmaintenance.

10.6 ROV CapabilitiesThe ROV shall be capable of operating within the local environmental conditionsand, simultaneously supporting equipment for the following functions:-

• acoustic tracking (subsea navigation)

• bathymetric measurement

• cathodic potential sensing

• video photography



ES.L.60 -27- Issued 10/98 Rev.2.1

10.6.1 Acoustic tracking (Subsea Navigation) System

Position fixing of the ROV relative to the survey support vessel shall be carried outwith the aid of an acoustic tracking system. The ROV shall be fitted with aresponder / transponder compatible with the vessels acoustic tracking system,which shall be interfaced with the navigation computer. ROV position fixes shallbe taken with the ROV positioned above or beside all significant features and atregular intervals along the pipeline.

10.6.2 Bathymetric System

The Hi Resolution (Digiquartz) Bathymetric system shall provide measurements atregular intervals along the pipeline. Measurements taken shall consist of:-

• ROV depth below sea level

• ROV altitude above seabed level

• Total water column depth (this can be a summation of ROV depth andaltitude)

• Measurements shall be updated continuously in order to generate acontinuous seabed profile.

• Bathymetric data is to be reduced to A.C.D. in accordance with ENC/4Hydrographic Survey Specification.



ES.L.60 -28- Issued 10/98 Rev.2.1

10.6.3 Video Photography System

The video survey shall be carried out utilising a SUPER VHS SYSTEM. TheContractor shall provide a TOTAL Super VHS System, inclusive of all equipment,cabling and connections.

All significant/anomalous features (e.g. pipe crossings, pipe or coating damage,debris, etc.) along the entire pipeline shall be surveyed and recorded. Sufficientvideo tapes shall be provided by the Contractor. The video tapes shall besimultaneously overwritten with all details as specified in 10.5.5 - Display. Thetapes shall have a simultaneously recorded, clearly spoken English commentary,and have a log indexing the tape counter to K.P. position and real time. Facilitieswill be provided to enable still H.Q. prints to be taken directly from the videounits.

The ROV shall be fitted with a minimum of three colour video cameras andassociated underwater lights. The colour cameras shall be mounted on pan and tiltunits, one to port and one to starboard and one above the centre line of the pipe (12o/c) to allow simultaneous video photography of each side and top of the pipeline.

10.6.4 Cathodic Protection Sensing System

Continuous field gradient and pipeline potential measurements shall be carried outalong the pipeline, using a ROV mounted meter (probe) which measures potentialdifferences relative to a remote reference electrode. It shall also be possible to takedirect contact readings using the probe.

Equipment provided on the support vessel shall as a minimum consist of a surfaceconsole/chart recorder, a dedicated computer and an off-line printer. The surfaceconsole/chart recorder shall display real time raw data and provide hard copyrecords of the data. Cathodic potential data shall be transferred from the surfaceconsole/chart recorder and overwritten on the video display of the video surveysystem. The CP computer shall integrate the CP data and navigation data andpreliminary plots of gradients and potential shall be produced in conjunction withthe off-line printer.

Preliminary onboard processing of the CP data shall be carried out in order toidentify the location, nature and severity of any C.P. problems, for furthersurvey/data gathering, whilst the survey is still in progress.



ES.L.60 -29- Issued 10/98 Rev.2.1

10.7 Survey Support VesselThe survey support vessel shall be capable of efficiently supporting ROVoperations. The vessel shall be of sufficient size to accommodate all personnel andequipment required to carry out the survey.

The vessel shall have RT, ship to shore telephone and preferably telex and faxcommunication facilities.

The vessel shall be fitted with a navigation system as specified in Section 10.3.

The vessel shall be fitted with an acoustic tracking (subsea navigation) system (asspecified in Section 10.3) for ROV position fixing and an echo sounder foroperations in shallow water.

The vessel shall be fitted with a navigation computer (as specified in Section 10.3)to interface between the primary and subsea navigation systems.

The vessel shall also be fitted with a repeater monitor, on the vessel bridge, fedfrom the navigation computer with updates on vessel location and tracks to steer.

All vessels proposed by the Contractor to be utilised in fulfilment of the surveys,shall be notified to QGPC Field Support department for comment and approval onemonth prior to start of contract.

All vessels operated in QGPC waters shall adhere to the requirements of QGPCcurrent Marine procedures.



ES.L.60 -30- Issued 10/98 Rev.2.1

11 REPORTING REQUIREMENTSAll communication, both documentary and spoken, shall be in the English Language.

11.1 Anomaly Reporting SystemThe aim of this section is to set out the Anomaly descriptions, limits and actionswhich are to be taken during the execution of any Underwater pipeline relatedwork activity on the Corporation's facilities.

The system is intended to act as a standardisation procedure, against which allitems considered detrimental, or potentially detrimental, to the pipeline and its"Fitness for Purpose" are highlight ed.

In each case it is intended that after full assessment of each anomaly, an 'onboard'recommendation is made, in writing, regarding an effective remedial action (if any)that may be taken to rectify or negate each anomaly.

Items inspected which fall outside an established acceptance criteria arehighlighted as they are deemed to be anomalous, and are therefore to be reported indetail. The anomaly actions as stated are the minimum required and furtherinspection may be conducted after consultation with the associated disciplineengineers.

Any significant anomalies identified by the contractor shall be reportedimmediately to the onboard Corporation Representative whose responsibility it isto carry out an initial assessment and detail further inspection requirements afterconsultation with the relevant onshore discipline engineers.



ES.L.60 -31- Issued 10/98 Rev.2.1

11.2 Anomaly Codes And DescriptionsAnomaly Code Description

• AW Anode Wastage

• BP Buried Pipe

• BM Bare Metal Exposed

• CW Weight Coat Damage

• CC Corrosion Coat Damage

• CL Clearance

• CP Low Cathodic Potential

• CPH High Cathodic Potential

• CRP Pitting Corrosion

• CRG General Corrosion

• DM Metallic Debris

• DN Non-Metallic Debris

• FS Freespan

• LK Leak

• LI Lack of Integrity

• MG Marine Growth

• OA Other Anomaly

• PD Physical Damage

• PM Parent Metal Damage

• RM Relative Movement

• SU Suspension

• VS Variation From Specification

• VL Variation From Last Survey

• WT Wall Thickness Anomaly



ES.L.60 -32- Issued 10/98 Rev.2.1

11.3 Action Codes And DescriptionsAction Code Description

• CR Take Cathodic Potential Reading

• DR Remove Debris

• EN Record Easting & Northing

• KP Record Kilometre Post

• MH Measure Height

• ML Measure Length

• PH Take Photograph

• RC Record Condition

• RD Record Dimension

• RE Record Element/Component

• RL Record Rate Of Leakage

• RT Record Type Of Damage

• RV Record Variation

• SK Sketch Anomaly

• TR Record Thickness

• WR Take Wall Thickness Reading



ES.L.60 -33- Issued 10/98 Rev.2.1

11.4 Anomaly Code DefinitionsANOMCODE

DESCRIP-TION

LIMITS ACTIONS CHECK

AW AnodeWastage

> 50% Record condition &location. Take CP onanode stub.Photograph

RC,EN, KP,CR PH.

BM Bare MetalExposed

Any Record condition,location &dimensions. Take CP.Photograph

RC, EN, KP,RD CR, PH

BP Buried Pipe Any Record location &extent. Take CPreading @ start & end

EN, KP, CR.

CC Corrosion CoatDamage

Any Record location,dimensions &condition. Take CP &UT if possible.Photograph

EN, KP RC,CR WR, PH

CW Weight coatDamage

Any Record location,dimensions &condition. Take CP.Photograph

RC, EN KP,CR PH.

CL Clearance Any betweenriser & clamp orpipeline &Supports

Record location,element, condition,status & dimensions.Photograph.

RC,ENKP,RE PH.

CPL

CPH

Low or HighCathodicPotentialReading

Any < -800mv&> -1050mv

Record CP, location,element & condition.Check anode

CR,ENKP,RE RC.

CRG

CRP

CorrosionGeneral orPitting

Any Record CP, element,location, condition &dimensions. Take WT.

RE,CREN,KPRD,RC WR.

DM

DN

Debris -Metallic

Non - Metallic

Any large,Unsecured,AbrasiveMetallic orHazardous

Remove were possible.If unable record type,position &dimensions.If metallic take CP.

DR,RCEN,KPCR,RD

FS Freespan 4” > 6mtr6” > 6mts8” > 7mtr10” >8mtr12” and above>9mts

Record length height,location & seabedcondition at lift-off &touchdown

ML,MHKP,EN RC.

LK Leak Any Record location,component & sketch.Estimate rate of leak(small, medium,

EN,KPSK,RLCR,WR



ES.L.60 -34- Issued 10/98 Rev.2.1

large). Take CP/UT.Photograph

PH,RE

MG Marine GrowthOn Riser

Any > 75mm to- 10mt Elev. Or> 50mm below -10mts Elev.

Record thickness,percentage hard orsoft. Photograph

TR,PH

PD PhysicalDamage

Any Record condition,location, type &dimensions. TakeCP/UT. Photograph

RC,ENKP,RTRD,WR CR.

RM RelativeMovement

Any Record condition,location, type &dimensions.Photograph

RC,ENKP,SKRE,PH

LI Lack ofIntegrity

Any Record location,condition, type &dimensions.Photograph

EN,KPRC,RD PH.

OA Other Anomaly Any Record location, type,dimensions condition.Photograph

EN, KP RD,RC PH, SK

PM Parent metalDamage

Any Record location, type,condition, dimensions.Take CP/UT.Photograph

EN,KPRC,RDCR,WR PH.

VL Variation Fromlast Survey

Any Record variation,location & sketch.Photograph.

RV, EN KP,RC SK, PH

VS Variation From(as built)Specification

Any Record variation,element, location &position.

RV, EN KP,RC SK.

WT WallThickness Loss

Any > 90% ofNominal WallThickness

Record location &element. Takeadditional UT.

EN,KPRE,RC WR.



ES.L.60 -35- Issued 10/98 Rev.2.1

11.5 Daily ReportThe Contractor shall submit a daily report each morning, by the most expedientmeans, of all works completed on a 24 hour basis to the Employer's nominatedrepresentative. The report is intended to be a synopsis of the days events andfindings in a clear and concise manner, and shall include, as a minimum, thefollowing:-

• Date and location(s).

• Amount of work achieved to date.

• Summary of findings.

• Anomaly highlights.

• Anticipated work programme for the next 24 hours.

11.6 Draft ReportThe Contractor shall provide a hard and digital copy draft report to the Employer'snominated representative within 7 days of the completion of each completepipeline survey. This report is intended as a general synopsis of the overallexternal pipeline condition based upon the survey results. As such it shall beproduced in a clear and concise format as detailed below.

• Name, diameter and extremities of pipeline, as surveyed.

• Details of pipeline.

• Summary listing of anomaly findings and locations, i.e. type of defects,locations, orientations, sizes and depths, K.P.'s, Eastings and Northings, etc.

• Individual major anomaly reports, to include; location, extent and bothwritten and pictorial (compilation video, Photographs) evidence of findings.

The Employer appreciates that this is a DRAFT report and as such accepts that thequality of presentation need not be the same as for the final report, however, thesereports will constitute the basis upon which a remedial workscope may beconducted and as such the findings and results shall be presented in the most clearand accurate manner.



ES.L.60 -36- Issued 10/98 Rev.2.1

11.7 Final ReportThe Contractor shall provide one copy of the Final report to the Employer'srepresentative within 14 days of completion of each individual pipeline survey.

All data collected shall remain the property of the Employer. The Employer shallat all times throughout the contract have reasonable access to this data and theContractor shall, if requested by the Employer, provide copies of this data.

The final report shall be a detailed presentation of the work program, results andconclusions and shall be submitted in digital format on CD-ROM disc(s) withsuitable label and cover plus one (1) hard copy presented in hard cover A4 files, offour (4) ring binder type. The name, diameter and extremities of the pipeline,inclusive of date of survey and volume numbers, shall be printed on the front faceand spine of the files.

Each file shall contain only the information of one complete pipeline survey in thefollowing format:-

Each pipeline report shall be concise and factual in lay-out, content and volumeand is intended to be a working report to be used quickly to inform the reader as tothe condition/status of each pipeline.

11.7.1 Introduction & Project Requirements

This shall be a summary introducing the reader to the report, it shall detail thepipeline surveyed, give parameters and basic design, age and operating data.Further it shall specify the project requirements and any variance between thecontractual and actual as-surveyed data, and shall identify whether this was a "PostLay", "Baseline" or "Condition Monitoring" survey.



ES.L.60 -37- Issued 10/98 Rev.2.1

11.7.2 Operational Data

This section of the report shall contain operational data pertinent to the surveyedpipeline, as a minimum this shall contain the following data:-

Times

• Total survey duration time

• Average survey rates ( i.e. 1 km/hr.)

• Standby times (weather, other operations etc.)

• Breakdown times

• Transit times.

This data may be presented in computer print out form. All times will be presentedin hourly format, referenced against calendar days.

Personnel

• Personnel listing

• Dive logs

Equipment

• Survey equipment

• ROV equipment

• Equipment specifications.

Navigation

• Station lists

• Equipment used

• Problems/obstructions/variations.

11.7.3 Condition Summary

This summary shall be presented in overview format and will detail the overallcondition of the pipeline and highlight the types, number and extent of anomalieslocated, in a concise written format, tabulated forms may be utilised to support thesummary.

11.7.4 Fitness for Purpose Technical Evaluation

This section of the report shall provide a conclusive statement, based on the totalsurvey results, known operating parameters, and current engineering standards, asto whether the pipeline continues to be fit for purpose. Where in the opinion of the



ES.L.60 -38- Issued 10/98 Rev.2.1

Contractor, remedial work is required to ensure or maintain the fitness of thepipeline, this shall be stated.

In effect the Contractor shall provide an unbiased consultative statement,supported by the facts and good oil field practice.

11.7.5 Main Report Section

Each main report section shall be divided into subsections detailing line status andcondition, anomalies located, appurtenances and attachments.

Detailed written, graphical and pictorial evidence will support the findings, whichas a minimum shall include the following headings and sub headings:-

A: Damage

• Major

• Minor

B: Debris

• Metallic

• Non-Metallic

C: Cathodic Protection

• Anodes

• Continuous Trace Profile

• Stab Reading Profile

D: Coating

• Corrosion Coating

• Weight Coating

E: Fixed Features

• Mechanical Anchors

• Bends/Elbows

• Crossings

• Dog Legs/Spools/Expansion Loops

• Flanges

• Tee's



ES.L.60 -39- Issued 10/98 Rev.2.1

• Tie-in's

• Valves

• Other

F: Risers

• Clamps

• Coating

• Cathodic Protection

• Damage

• Marine Growth

• Security

G: Stability

• Burial

• Exposure

• Freespans

• Movement

• Supports

H: Topography

• Depth Profiles

• Seabed Type

The aim of this report format is to enable the reader to identify immediately anypipeline data, relative to a specific heading, without having to read the entirereport.



ES.L.60 -40- Issued 10/98 Rev.2.1

11.7.6 Anomaly Data

All anomalies will be detailed in log format in chronological order, each anomalywill be given a clear & concise description inclusive of all dimensions, they willfurther be listed with KP location and position fix. Reference will be made to thevideo tape number, giving real time reference, photo log reference, frame numbersshall also be detailed. Reference to the relevant charts and any other compositedata shall also be made.

It is a further requirement that the Contractor supplies a "Compilation Video(s)"containing all anomalies located on each pipeline, in order to facilitate review bythe Employer, this video shall be edited from the survey videos on a regularongoing basis.

Whilst it is accepted that, unlike other inspection surveys, (i.e. structural) pipelineinspections cannot solely be based upon anomaly reporting only, as basic data suchas position & topography, are constantly being evaluated, the anomaly reportingformat as detailed in Section 11.4 shall apply to all anomalies recorded.

THE DEFINITION OF THE WORD "ANOMALY" IN THIS DOCUMENT ISUSED TO DESCRIBE ANY IRREGULARITY FOUND EITHER ON, UNDEROR NEXT TO THE PIPELINE OR ANY DEVIATION OBSERVED THATDOES NOT COMPLY WITH THE RULES, CODES OR STANDARDSDETAILED IN THIS SPECIFICATION.

A. Damage

All damage located during the survey, shall be recorded and fixed, as per theanomaly reporting format. Damage will be recorded as either major or minor innature.

Major Damage is defined as that which could or does constitute a hazard to theefficient or safe operation of the pipeline.

Minor Damage is defined as that which does not now, or at any time in the future,present a hazard to the safe or efficient operation of the pipeline.

B. Debris

Shall be reported as per the anomaly reporting requirements. Debris which is nottouching the pipeline, but is however in close proximity (+/- 2 metres fromcentreline of pipe) and likely to constitute a potential future hazard shall also bereported.

The Contractor shall be aware that the term "Debris" for the purposes of thisspecification constitutes any metallic or non metallic object whose size or nature islikely to affect the safe and efficient operation of the pipeline, or hinder or harmthe investigation or maintenance of the pipeline.

The reporting of all debris which falls outside this criterion is not required.



ES.L.60 -41- Issued 10/98 Rev.2.1

C. C.P. Data

Will be provided in graphical form in support of the written statement and will bereferenced against a minimum allowable value (as per standard, dependent on celltype). A minimum of 10 values per kilometre will be utilised in the production ofthe graphs. Calibration data, dates, equipment types and serial nos. will also beprovided.

D. Coating Status

In support of the video survey narrative a clear and concise written description ofoverall coating status will be given inclusive of type, variances, condition,percentage loss and marine growth cover. A selective, referenced photographicmosaic will be included, supporting these findings.

E. Fixed Features

All fixed features are to be listed in tabulated form, giving a brief description ofcondition & status. Note will be made of the existence of any stud protectors andflange protectors on flanges, the condition of these items will be noted. KPlocations are to be given along with position "Fixes". References to video's,photo's and charts are also to be shown.

It is a further requirement of the contractor, that he provide sufficient positionsfixes at readily identified positions between the riser bend, spool/dogleg and firstfield joint/flange in order to ascertain any pipeline movement, by means oftriangulation.

This data shall be presented in this section inclusive of a graphical plot, indicatingas surveyed position and distance between reference points.

The Contractor will also display and record the Heading traversed on all Bendsand Elbows. All crossings shall be detailed in tabulated form, giving details of pipeline(s) crossed, condition/status of crossing, KP location, position fix anddimension of gap between pipes, reference to video logs, video and photographicdata shall also be supplied.

F. Risers

All risers at both source and destination shall be video surveyed from HAT to tie-in/flange. The survey results shall be recorded on separate video tape from that ofthe pipeline survey. Photographs of all attachments shall also be provided.

In effect the Riser survey report shall be a report within the main report in order tofacilitate data access. All CP readings including a graphical display, status andcondition reports shall be appended to this section. The Contractor shall fix theposition of the riser stem & tube turn (bend) this data is to be supplied in thereport.

G. Pipeline Stability

A detailed listing, in tabulated form detailing the extent of any freespans,movement or burial/exposure shall be included, all items will be referencedbetween a Start and End KP and given position co-ordinates. Other composite dataincluding dimensions, topography types and associated anomalies shall be detailed.



ES.L.60 -42- Issued 10/98 Rev.2.1

H. Topography

In support of the video survey narrative a clear and concise written description ofthe overall topography traversed by the pipe route is to be included, this willinclude seabed type, major features, profiles, water depths etc. and will bereferenced to the produced charts.

11.7.7 Supplementary Data

This section of the report will provide pipesheets and charts in support of the dataprovided in the main report.

Pipesheets: shall be provided, detailing all items located, on the pipeline route.The pipesheets will be computer generated, displaying five 60mt Sections of pipe,annotated with K.P. values at the start and end of each 60 metre section. Eachsheet will detail the date of the survey, video tape reference number, photo lognumber and chart reference number. Each sheet will be numbered in chronologicalorder.

Charts: the entire pipeline from source riser at HAT to receiving riser at HAT willbe charted. All charts will be provided in A1 (570 mm x 850 mm) format at a scaleof 1:2500 and shall contain the following sub-plots.

1. Planimetric View

In this plan view, the trackplot will be presented with all associated contacts fromthe sonar data. All significant events will be shown within this plan view.

Chart scales will be 1:2,500, including the geographical and UTM 51 degrees CMgraticules. The tick interval will be 10 cm. The proposed pipeline route will beindicated with KP and/or KPC annotation at 0.5 km intervals.

2. Longitudinal Profile

In this plot the profile will be presented as dense as possible, referenced to the KPsystem of the determined route. The vertical scale will be depth dependent(nominal 1:250) and horizontal scale 1:2,500. The profile data will enable theplotting of the top and bottom of the pipeline and the lowest seabed level adjacentto the pipe.

3. Cross Profiles

In this plot the selected cross profiles recorded by the Dual Head Scanning Sonar(DHSS), will be shown at regular intervals. These profiles will show profilenumber, KPC, mean seabed level and the pipeline. Horizontal and Vertical scaleswill allow optimum display.

DHSS cross profiles. Profiles shall be gauged and recorded on a continuous basisand shall be plotted at intervals not exceeding 100m. Where anomalous spans arerecorded (as per anomaly sheet), profiles shall be plotted as a minimum, at 1/spannominal separation.

Note - Crossovers are not classified as suspensions.



ES.L.60 -43- Issued 10/98 Rev.2.1

4. Cathodic Protection Profile

The cathodic protection along each pipeline will be indicated by a profile ofCathodic Potential against the KP system of the determined route. Condition ofeach sacrificial anode shall also be noted in terms of percentage of wastage. Auniform vertical scale in millivolts (mV) will be selected on an individual pipelinebasis.

5. Keybars

The keybar panel will show the following data:-

• Video tape identifier

• Anodes

• Field joints and numbers

• Debris

• Anomalous freespans

• KPC indication.

• Fixed features.

• Damage

• Coating Anomalies

• Burial status

6. Data Storage

The original on-line data will be secured and only used for copying. Serialmagnetic tape will be "backed" onto throughout the survey and shall be the archiveback up.

7. Header/Legends/Notes

General chart information, such as names, titles, geodetic details, tidal reductionetc. will be presented in separate boxes on the right hand side of the chart.

All charts will be produced on stable film material and will contain all items asspecified above.

A paper copy of all charts shall be provided with each report.

11.7.8 Video Recordings

A continuous composite colour video recording of each pipeline shall be provided,utilising a Digital Colour Quad unit. In this manner, the image from the three (3)video cameras and the dual head scanning sonar (DHSS) will be recorded on onetape. In addition, real time commentary, supported by summarised "typed" videologs shall be provided, further more video overlay, displaying real time and date,



ES.L.60 -44- Issued 10/98 Rev.2.1

KP roll, UTM's, CP values, line identity, depth, heading and dive number is alsorequired.

The video cassettes are to be recorded using the PAL colour system in SUPERVHS format, the content of the cassette will be identified on the front face andspine. In addition the bottom left hand corner of the spine (beside the erasureprotection tag) of all video tapes is to be engraved with a number. This number isto be sequentially allocated throughout the project and shall be unique to eachcassette. This number shall be referenced in the video tape index.

All tapes used during the survey programme shall be sequentially listed on aVIDEO TAPE INDEX.

The tape will be identified with the following minimum data:-

• Contractors Name

• Pipeline

• Date of Survey

• Start & end KP value & UTM Co-ordinate

• Progressive tape No. (e.g. 1 of 6 etc.)

• Video log reference.

Video log references will be detailed and annotated in the following manner:-

PIPELINE REFERENCE NUMBER / UNIQUE TAPE NO / MONTH / YEAR /PROGRESSIVE TAPE NO.

e.g. IS001/42/07/92/01X20

Only HIGH QUALITY cassettes boxed in plastic housing's will be utilised, the useof slow play/record technology is actively encouraged by the Employer as thisreduces the necessity for large storage capacities. However, where the use of thistechnology significantly decreases the video picture quality, it shall not be used.

During the surveys the Contractor will constantly monitor the quality of therecordings via an on-screen playback facility.

11.7.9 Photographic Reports

All photographic results shall be processed within 12 hours of film recovery andreferred to the onboard Corporation Representative for approval.

Photographs selected for inclusion in the report are to be scanned and included inthe digital report in JPEG format.

Once processed and approved all negatives will be filed in plastic contact sheets ofA4 size in files of four ring binder type. Each negative will be logged by framenumber on a typed log sheet specifying the subject matter.



ES.L.60 -45- Issued 10/98 Rev.2.1

In addition each photo log and contact sheet will specify the following data:-

• Dive No.

• Date

• Pipeline

• KP reference

• Roll number

• Sequence No. (e.g. 1 of 20 et c.)

Prints will be produced in situations which require close or detailed visualinspection unless otherwise specified. All positives will be produced in enlargedformat to a size 125mm x 100mm in matt finish. These shall be catalogued &referenced to the photo-logs & reports.

All photographic log references will be detailed and annotated in the followingmanner:-

PIPELINE REFERENCE No./MONTH/YEAR/FILM No. x SEQUENCE/FRAME No.

e.g. IS001/07/92/05x09/06



ES.L.60 -46- Issued 10/98 Rev.2.1

12 CONTRACTOR RESPONSIBILITIESThe Contractor shall submit to the Employer a complete digital and hard copy oftheir Inspection Procedures and Specifications Manual, prior to work commencing.

A copy of the Contractors Quality Manual relating to ROV operations, reporting,equipment, maintenance and personnel management shall be submitted to theEmployer, prior to work commencing.

A copy of the Contractors Organigram, line reporting and responsibility chart,shall be submitted to the Employer prior to work commencing.

Lists of all personnel that will or may be involved in the work programme,supported by certification and supplementary evidence, is to be submitted to theEmployer, prior to work commencing. Lists of all equipment, including serialnumbers, (where applicable) makes models & capabilities are to be provided to theEmployer, prior to work commencing.

The Contractor will detail all environmental limitations likely to affect the ROVoperation, e.g. wind, sea, current, visibility etc., prior to work commencing. Adetailed bar chart programme showing all aspects of the work including start dates& duration, prior to work commencing.

During the offshore survey, the Contractor shall provide all vessels, equipment,personnel and services necessary for the satisfactory completion of the survey, andshall make provision for a Corporation Representative for the duration of thesurvey as follows:-

• Accommodation and messing aboard survey support vessel(s)

• Facilities for monitoring and maintaining the survey results.

• R/T communication channels

• Dedicated ship to shore radio telephone link.



ES.L.60 -47- Issued 10/98 Rev.2.1

13 ENVIRONMENT DATA

13.1 Water DataSeawater design Max.+33ºC Min. +17ºC

temperature

Density 1027 kg/m3

Depth Max & Min-(see relevant pipeline data sheet)

13.2 Air DataMaximum summer 50ºCtemperature (shaded)

Maximum summer 84ºCtemperature (unshaded)

Design air temperature Max. +50ºC, Min. -0ºC

Mean humidity Max. +89%, Min. +29%

13.3 Current DataCurrent velocity Maximum peak stream surface current 2.5 knots

(1.29 m/s)

Current direction (to) NNW and SSE

Seabed current Velocity profile decreasing towards the seabedaccording to the one seventh (1/7) power law.

13.4 Wave Data

13.4.1 1 year Return Period

15 msw 35 msw

Wave period (s) - 7.9 7.3

Maximum wave height (m) - 5.1 5.2

Significant wave height (m) - 2.7 2.8

Maximum crest elevation (m) - 3.0 2.9

Wave direction (from) - omni-directional


15 msw 35 msw



ES.L.60 -48- Issued 10/98 Rev.2.1

Wave period (s) - 11.0 10.2

Maximum wave height (m) - 9.7 10.2

Significant wave height (m) - 5.2 5.5

Maximum crest elevation (m) - 6.7 5.8

Wave direction (from) - NW & SE (+/- 15 degrees)

13.5 Wind Data10 second mean,1 year return period 44 knots from NWSW

10 second mean,100 year return period 79 knots from NWSW

1 hour mean,1 year return period 32 knots from NWNW

1 hour mean,100 year return period 49 knots from NWNW

13.6 Extreme Water Depths (m)


15 msw 30 msw

MHHW above chart datum - 1.5 1.5

Storm surge - 0.3 0.3

Maximum crest elevation - 3.0 2.9

Sub-total - 4.8 4.7

Margin of 10% - 0.5 0.5

Total - 5.3 5.2


MHHW above chart datum - 1.5 1.5

Storm surge - 1.3 1.3

Maximum crest elevation - 6.7 5.8

Sub-total - 9.5 8.6

Margin of 10% - 1.0 0.9



ES.L.60 -49- Issued 10/98 Rev.2.1

Total - 10.5 9.5

13.7 Reference DataMemorandum, climatological/tidal conditions in QGPC (Offshore) areas ofoperations MRSB to ENP/47, 21/1/89.

IMCOS study 25/9/75 as amended 27/7/82 and further updated for Bul Haninegaslift project 7/2/87.

13.8 Soils Data

13.8.1 General

Contractors are cautioned that the following soils data was obtained from siteinvestigations at the Production Station locations. As soil conditions varyconsiderably along pipeline routes between fields and to shore locations, the actualsoil condition at the location of pipeline works should be confirmed prior tocommencement of work.

13.8.2 Idd El Shargi field

Surface soil type Sandy carbonate silt

Angle of shear resistance (O) 25º

Submerged density 0.049 kips/cu. ft.

Coefficient of friction(assumed) 0.6

Soil conditions generally in the field are described as hard packed sand and gravelwith outcrops of coral, see relevant pipeline data sheet.

13.8.3 Maydan Mahzam field

Surface soil type Sandy carbonate silt




Soil conditions generally in the field are described as heavy clay and mud, seerelevant pipeline data sheet.

13.8.4 Bul Hanine field

Surface soil type Limestone



ES.L.60 -50- Issued 10/98 Rev.2.1




Soil conditions generally in the field are described as mainly a coral bottom, seerelevant pipeline data sheet.

13.8.5 Reference Data

The following reference data sources were used in developing the EPRPenvironmental data, and may be consulted for additional data.

• Technip Geoproduction, Bul Hanine Gaslift Design Brief - Pipelines. GTC09/OFF/86.

• QGPC (Oil & Gas Operations), Engineering Standards - structural, E.S.S.10.May 1986.

McClelland Engineers, Analyses for the foundations, three productionplatforms, Qatar Gas Company Ltd., report to C. E. Crest Offshore.

es-l-60 rev2.1 spec for inspection of subsea pipelines

Documents