06-samss-001

Previous Issue: 10 September 2011 Next Planned Update: 10 September 2016

Revised paragraphs are indicated in the right margin of 18

Primary contact: Mehdi, Mauyed Sahib on +966-3-8809547

Copyright©Saudi Aramco 2013. All rights reserved.

Materials System Specification

06-SAMSS-001 3 March 2013 Selection and Qualification of Elastomeric Sealing Materials and Manufacturers

Document Responsibility: Non-metallic Standards Committee

Saudi Aramco DeskTop Standards

Table of Contents

1 Scope................................................................. 2

2 Conflicts and Deviations.................................... 2

3 References......................................................... 2

4 Definitions and Abbreviations............................ 5

5 Operational Requirements................................. 7

6 Documentation Requirements........................... 8

7 Elastomeric Materials Commonly Used in Oil and Gas Fields........................... 9

8 Manufacturers Qualification Requirements....... 9

9 Qualification of Elastomeric Sealing Materials. 10 Annex A – Guidelines for the Chemical Resistance of Oilfield Elastomers........ 19

Document Responsibility: Non-metallic Standards Committee 06-SAMSS-001

Issue Date: 3 March 2013 Selection and Qualification of Elastomeric

Next Planned Update: 10 September 2016 Sealing Materials and Manufacturers

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1 Scope

This specification defines the requirements for critical elastomeric sealing and seat

materials for permanent use in onshore and offshore equipment. It describes general

principles and gives requirements and recommendations for the selection and

qualification of elastomeric materials as well as manufacturers of these elements.

The specification applies to all sealing elements such as elastomeric o-rings, bonded

flexible hose liner elastomeric materials, elastomeric materials in flexible joints, and

elastomer lined valves.

2 Conflicts and Deviations

2.1 Any conflicts between this specification and other applicable Saudi Aramco

Materials System Specifications (SAMSSs), Engineering Standards (SAESs),

Standard Drawings (SASDs), or industry standards, codes, and forms shall be

resolved in writing, prior to submission of bids or start of related work, by the

Company or Buyer Representative through the Manager, Consulting Services

Department, Saudi Aramco, Dhahran.

2.2 Direct all requests to deviate from this specification in writing to the Company or

Buyer Representative, who shall follow internal company procedure SAEP-302

and forward such requests to the Manager, Consulting Services Department, Saudi

Aramco, Dhahran.

3 References

Material supplied to this specification shall comply with the latest edition of the

references listed below unless otherwise noted:

3.1 Saudi Aramco References

Saudi Aramco Engineering Procedure

SAEP-302 Instructions for Obtaining a Waiver of a Mandatory

Saudi Aramco Engineering Requirement

Saudi Aramco Inspection Requirements

Form 175-XXX

3.2 Industry Codes and Standards

American Society for Testing and Materials

ASTM D395 Standard Test Method for Rubber Property -

Compression Set

https://standards.aramco.com.sa:10009/mycommittee.asp?fol=Saep&committee_id=126&sm=SAEP-302

https://standards.aramco.com.sa:10009/mycommittee.asp?fol=Saep&committee_id=126&sm=SAEP-302




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ASTM D746 Test Method for Brittleness Temperature of Plastics

and Elastomers by Impact

ASTM D792 Test Methods for Specific Gravity and Density of

Plastics by Displacement

ASTM D1415 Standard Test Method for Rubber Property -

International Hardness (IRHD)

ASTM D2240 Test Method for Rubber Property - Durometer

Hardness (Shore A/ D)

ASTM D297 Standard Test Methods for Rubber Products -

Chemical Analysis

ASTM D1141 Standard Practice for the Preparation of Substitute

Ocean Water

ASTM D1414 Standard Test Methods of Testing Rubber O-rings

ASTM D3032 Description of Arrhenius method: Method of Testing

Hook-Up Wire Insulation

ASTM D1418-06 Standard Practice for Rubber and Rubber Lattices-

Nomenclature

British Standards

BS 1806 Standard Inch Sizes of O-rings

BS 6442 Specification for Limits of Surface Imperfections on

Elastomeric Toroidal Sealing Rings (O-rings)

International Organization for Standardization

ISO 868 Determination of Indentation Hardness by means of

a Durometer (Shore A/ D hardness)

ISO 1432 Rubber Vulcanised - Low Temperature Stiffening

(Gehman Test)

ISO 1817 Vulcanised Rubbers - Resistance to Liquids -

Methods of Tests

ISO D34 Tear Resistance, Method A

ISO R 812 Method of Test for Temperature Limit of Brittleness

for Vulcanized Rubbers

ISO 34-1:2005 Rubber, Vulcanized or Thermoplastic -

Determination of Tear

ISO 36:2005 Rubber, Vulcanized or Thermoplastic -

Determination of Adhesion to Textile Fabrics




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ISO 37 Rubber, Vulcanized or Thermoplastic -

Determination of Tensile Stress-Strain Properties


Determination of Hardness (Hardness between

10 IRHD and 100 IRHD)

ISO 815-1 Rubber, Vulcanised or Thermoplastic -

Determination of Compression Set - Part 1: at

Ambient or Elevated Temperatures


Determination of Low Temperature Stiffening

(Gehman Test)

ISO 1432 Technical Corrigendum, Rubber, Vulcanized or

Thermoplastic - Determination of Low

Temperature Stiffening (Gehman Test); Technical

Corrigendum 1

ISO 1817 Rubber, Vulcanized - Determination of the Effect of

Liquids


Determination of Density

ISO 2921 Rubber Vulcanized - Determination of Low

Temperature Characteristics - Temperature-

Retraction Procedure (TR Test)

ISO 3601-1 Fluid Power Systems - O-rings -

Part 1: Inside Diameters, Cross-Sections,

Tolerances and Designation Codes

ISO 3601-3:2005 Fluid Power Systems - O-rings - Part 3: Quality

Acceptance Criteria

ISO 7619-1 Rubber, Vulcanized or Thermoplastic -

Determination of Indentation Hardness -

Part 1: Durometer Method (Shore Hardness)

ISO 13628-10:2005 Petroleum and Natural Gas Industries - Design and

Operation of Subsea Production Systems -

Part 10: Specification for Bonded Flexible Pipe

American Petroleum Institute

API 17K Specification for Bonded Flexible Pipe




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DECOMPRESSION TEST Standards

NACE TM0192-2003 Evaluating Elastomeric Materials in Carbon

Dioxide Decompression Environments

NACE TM0297-2002 Effects of High-Temperature, High-Pressure

Carbon Dioxide Decompression on

Elastomeric Materials

SHELL “Functional and Material Requirements for

Nonmetallic Seal Materials”

TOTAL GS PVV 142 Appendix 8 “Elastomer “O”-Ring Seals Explosion

Decompression Type Testing Procedure

NORSOK M-CR-710 Rev. 2 2001 “Qualification of Non-metallic Sealing

Materials and Manufacturers

BHR Group Modeling of Decompression in Elastomeric Systems (MODES)

Consortium, 2003, ED View Version 3.0

4 Definitions and Abbreviations

4.1 Definitions

Accelerated Test: A test at temperatures and selected pressure values chosen to

accelerate seal degradation effects.

Compression Set: % 100 x [(Original seal height - Post test seal height) /

Interference].

Elastomer: A material compounded from rubbers and other constituents, and

then cured to form a rubbery material.

Fluid (or medium): A fluid or medium anything that flows without a recovery

such as gas, liquid, supercritical gas, or a mixture of these fluid if it is not in a

container.

Room Temperature: 20°C ±2°C.

Seal Type: A seal design of specified geometry, size and orientation.

Compression Set, %: 100 x [(Original sample height - Post-test height) /

Interference]

Elastomer: Amorphous material mechanically mixed with other constituents to

form a rubber compound which is then shaped by flow into articles by the

manufacturing processes of molding or extrusion and (invariably) chemically




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cured at elevated temperature to form an elastic insoluble material. Alternative

name; rubber.

Fluid (or medium): A medium such as a gas, liquid, supercritical gas, or a

mixture of these

Interference: (Original sample height - height of spacer bar), each measured in

same direction as direction of compression

(Compound) Manufacturer: Producer of the elastomer material or semi-

finished products made from elastomer materials.

Polymer: A high molecular weight molecule, natural or synthetic, whose

chemical structure can be represented by repeated small units which collectively

form molecular chains. This material class has three main sub-groups:

elastomers, thermoplastics and thermosets.

Rapid Gas Decompression (RGD) or Explosive Decompression (ED): Rapid

pressure-drop in a high pressure gas-containing system disrupts the equilibrium

between external gas pressure and the concentration of gas dissolved inside any

polymer. Excess gas seeks to come out of solution at points throughout the

material, causing expansion. If large enough and if the pressure-drop rate is

faster than the natural gas diffusion rate, blistering or rupturing can occur.

Seal Cross-Section: Free height of a seal at room temperature, measured

normal to seal diameter in the direction of compression in the test.

The measurement shall be taken at three circumferentially equi-distributed

positions. Also, abbreviated to Cross Section Diameter (CSD).

User: Responsible for the selection of suitable materials for a service operation

based on information received from asset operator.

Purchaser: Party responsible for procuring the elastomer material or component.

4.2 Abbreviations

COC Certificate of conformance

CSD Cross Section Diameter

CUT Continuous Use Temperature

DSC Differential Scanning Calorimetry

DTMA/TMA/DMTA/DMA Differential Thermo Mechanical Analysis/

Dynamic Mechanical Thermal Analysis or

Dynamic Mechanical Analysis




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ED Explosive Decompression

FPSO Floating Production Systems Offshore

MDSC Modulated Differential Scanning Calorimetry

RGD Rapid Gas Decompression (or De-pressurization)

QC Quality Control

5 Operational Requirements

Elastomeric materials selection shall be based on evaluation of compatibility with

service environment, functionality under service and the design lifetime.

When selecting elastomeric material for a specific service, the following properties shall

be considered and evaluated before use.

Chemical resistance based on published data or laboratory tests to be conducted if such

data is not available. ISO 1817, ASTM D 471, ASTM D 1460 and ASTM D 3137 are

examples of the standards to be adopted when evaluating elastomeric sealing element

chemical resistance for specific service. Tables A.1 of Annex A provide guidelines for

the Chemical Resistance of Oilfield Elastomers.

Physical and mechanical properties including compression set, hardness, modulus,

tear strength, tensile strength, etc., shall be conducted.

Resistance to explosive decompression

Resistance to high pressure extrusion

Resistance to thermal cycling

Resistance to long term aging

Resistance to aging effects of hydrogen sulfide gas at levels specified.

Clause 3.2 provides references to relevant industry standards for the above tests.

The test conditions and durations shall be as given in this specification. In cases where

this specification deviates from the industry standards, it is the responsibility of the

equipment buyer to supply all of the required technical information about service

conditions and environment.

6 Documentation Requirements

The following documentations shall be required:

Document for the elastomeric material properties as referenced in Section 5.




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Quality control document to include a certificate of conformance and traceability

information.

Properties that are not relevant to a specific process may be omitted.

The requirements for this documentation shall be valid for both the elastomeric seal

material and backup material when they are used as an integral part of the seal

assembly. Each seal material used shall be traceable to the producer and his quality

control documentation. Each batch of material shall be supplied with a certificate of

conformance (COC) and traceability as a minimum, see Table 6.0.

Table 6.0 – Shows the Required Minimum Numbers of Production

and Quality Control Tests for Both Elastomeric Seal Material

Properties Standard Documentation Quality

Control Test

1- Elastomers

Specific Gravity ASTM D 792 A B

Hardness (Shore A/IRHD) ASTM D 2240 A B

Tensile Properties ASTM 1414 A B

Compression set at 100°C for 7 days under Nitrogen

ASTM D 1414 A

Low temperature properties by DSC or DMA

ISO11357-2 ASTM E1640

A

Tear strength ASTM D 624 A

Low temperature stiffening at 20°C to -20°C

ISO 1432 A

Ageing/RGD characteristics (Annex 3)

A

H2S; Hydrogen Sulfide aging resistance for services where H2S ≥ 1000ppm

NACE TM-0187 or manufacturers testing procedure

A

A: Properties to be documented for each manufacturer for each material. Nominal values with tolerances shall be given.

B: Properties to be documented based on each batch with a minimum 3 samples per test per batch. The acceptance criteria shall identified prior to the test and based on qualification test results.

7 Elastomeric Materials Commonly Used In Oil and Gas Fields

7.1 General

Materials shall be selected and designed by the Manufacturer in accordance with

the requirements of this standard and specified on their equipment data sheets.




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A listing of common oilfield elastomers is given in Table 7.0 below.

The Manufacturer may propose alternate elastomer materials. Any alternate

elastomer material proposed by the Manufacturer will require technical review

and testing in accordance with this document prior to acceptance by Saudi

Aramco. The naming of these elastomers follows ASTM D1418-06.

Table 7.0 – Common Elastomers Utilized in the Oil and Gas Industry

Designation Elastomer Type

NBR Nitrile Acrylonitrile-butadiene

HNBR Hydrogenated acrylonitrile-butadiene

FKM-1 Vinylidene fluoride (VDF) and hexafluoropropylene (HFP)

FKM-2 VDF, HFP, and tetrafluoroethylene (TFE)

FKM-3 VDF, HFP, TFE, and perfluoromethylvinylether

FKM-4 propylene, TFE, and VDF

FKM-5 VDF, HFP, TFE, PMVE, and ethylene

FEPM or FCM (TFEP) Tetrafluoroethylene-propylene copolymer

FFKM Perfluoro elastomer

NOTE: Nitrile (NBR) elastomers shall not be specified for sour, H2S, services.

8 Manufacturers Qualification Requirements

Elastomeric seals manufacturer shall demonstrate sufficient competence, knowledge

and experience in elastomers and their relevant raw materials and have the necessary

equipment to produce and test their raw materials, semi finished products and final

products. Manufactured seals shall be certified by the manufacturer in line with the

service requirements and relevant industry standards. The manufacturer quality system

shall fulfill the requirements of ISO 9001, 9002 or equivalent.

The qualification testing shall apply for the elastomeric materials on a one-off basis and

the results shall be valid provided no changes have been made to the formulation of the

product. This applies also for changes in raw materials and their suppliers or sub

suppliers. If manufacturing is carried out at different plants, a separate qualification is

required for each plant.

Qualification testing will not be required if the elastomeric sealing material has an

existing documented in-service experience with traceable production records and

quality control documentation. This documentation shall contain detailed technical

information on service conditions such as time, temperature, pressure, fluid

composition. The service temperature shall be in the same range as for the new

application (maximum 10°C below) and the service life shall be minimum 50% of

design life.




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On-site audits shall be performed on a random basis after the manufacturer has become

a qualified supplier to Saudi Aramco.

9 Qualification of Elastomeric Sealing Materials

9.1 General

The requirements for testing of elastomeric sealing elements are divided into two

sections. The first section defines the aging test requirements and the second

defines the requirements for rapid gas decompression testing. The different test

regimes shall be selected based on analysis of service requirements for the

different equipment components and the material in question. Such assessment

shall address all fluids coming into contact with both sides of the elastomeric

sealing element and the chemistry of these fluids. The service life of the

elastomeric seal in the relevant service environment shall be evaluated using

appropriate methodologies.

9.2 Aging Test Requirements

9.2.1 General

This specification describes test procedures for the prediction of the

progressive degradation of elastomeric sealing elements exposed to

fluids at elevated temperatures and recommended pressure over an

extended period of time. It is applicable where prediction of service life

of an elastomeric sealing element is required or for comparing the

performance of different elastomeric sealing materials. The prediction

shall be based on tests performed at three different temperatures, all of

which shall be above the defined service temperature.

When no previous knowledge about the behavior of an elastomeric

sealing material in a certain fluid exists, an initial pre-check test shall be

performed. The test period shall be sufficient to reach saturation of the

fluid in the elastomeric material at the test temperature. Aging test can

proceed if no immediate changes in volume or weight occur.

The manufacturer shall, during aging accelerated testing for obtaining

results for extrapolation to service life, limit the test temperature to

ensure that the same chemical and/or physical processes will occur as

during service.

When extrapolating data from the present procedures appropriate

statistical techniques shall be applied. For example, if progressive

degradation is dependent on a single chemical ageing process, a method




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based on Arrhenius equation / method may be used as described in

ASTM D3032.

9.2.3 Approval Criteria

The approval criteria shall be determined prior to starting the aging test.

Based on documented experience the following criteria have been

identified as a baseline. The sealing element manufacturer shall justify

any deviation from these requirements.

The following property changes are acceptable for elastomeric sealing

element:

Tensile strength, elongation and 50% modulus; ±50%. This limit is

generally set as insurance against excessive deterioration and early

seal failure.

Hardness; 10/-20 units and +5/-20 when the initial hardness is

90 Shore A. Hardness is usually controlled to avoid excessive

softening (causing extrusion) or hardening (causing cracking, lack of

resilience, and leakage).

Swelling; +25%/-5%. This is the maximum amount of swell that

can be tolerated.

9.3 Aging Test Conditions

9.3.1 Test Temperatures

The tests shall be run at a minimum of three test temperatures, all of

which are above service temperature. The accelerated results shall be

used to conduct the extrapolation when Arrhenius methodology is

utilized. The limitations to extrapolation regarding temperature inherent

in the Arrhenius method shall apply.

Test temperature versus time details shall be fully described in the Test

Report.

9.3.2 Test Pressure

A test pressure of 100 (±10) bar or higher shall be used. This pressure

shall be attained by pressurization of the gas mixture after heating to the

selected temperature.

The pressure versus time details shall be described in the Test Report.




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9.3.3 Aging Test Fluid

Tests fluid shall be representative of the seal application conditions.

9.3.4 Simulated Production Fluid

The production fluids are defined as either sour or sweet with

composition as given in Tables 9.0 and 9.1, respectively. Testing in sour

service conditions will qualify the seal material for sweet service

conditions. For wells with high H2S levels (> 0,5 % of total), separate

tests with higher H2S level than required in Table 9.0 shall be conducted.

Table 9.0 – Test Condition for Sour Service Conditions

Volume % Fluid Composition

30 3% CO2 , 2% H2S, 95% CH4

10 Distilled water (conductivity < 5 μS)

60 70 % heptane, 20% cyclo-hexane, 10% toluene

Table 9.1 – Test Condition for Sweet Service Conditions

Volume% Fluid Composition

30 3% CO2, 95%CH4

10 Distilled water, conductivity < 5 μS

60 70% heptanes, 20% cyclo-hexane, 10% toluene

9.3.5 Other Test Fluid

Other fluid, in addition to production fluid, may be necessary to perform

application specific testing of materials in contact with chemicals such as

hydrate inhibitors, scale inhibitors, and corrosion inhibitors. Specific test

procedures shall be written per this standard, detailing the exposure

environment.

9.3.6 Exposure Time

The exposure time required for lifetime predictions shall be based on the

time to reach saturation of the test samples and be sufficiently long as to

allow for reliable extrapolation according to the requirements of

Arrhenius plot.




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9.4 Ageing Test Report

The report shall clearly state the following:

9.4.1 Test Seal Details

a. Manufacturer, seal type, manufacturer’s compound reference

number and size.

b. Seal material identification: generic polymer type (according to

ASTM definition), batch number and cure date.

9.4.2 Test Conditions

a. Test medium identification with detailed composition

b. Test temperature (°C) and temperature history

c. Test pressure (bar) and pressure history

d. Test duration (hours)

e. Date and time for start and end of test

9.4.3 Pre-Test Measurements

a. Seal dimensions, (mm), weight (g) and volume (cm³).

b. Hardness, Shore A.

c. Tensile strength, elongation at break and E-modulus (50%).

d. Initial linear interference, (mm).

9.4.4 Post-Test Examination

a. Test specimens shall be visually inspected for external damage.

The nature of any physical damage, set, embattlement, swell,

blistering, etc., and its location shall be recorded and reported in

the Test Report.

A photographic record (10-x magnification) of specific features

shall be included in the Test Report.

b. Mean cross-section, (mm), weight (g) and volume (cm³).

c. Hardness, Shore A/ IRHD.

d. Compression set, %.

e. Tensile strength, elongation at break and E-modulus (50%).




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9.4.5 Service Life Estimation

The test results obtained after aging shall be presented graphically as a

plot against a logarithmic time scale. Further, a graphical presentation

according to Arrhenius method [logarithmic time against 1/T [absolute

temperature (K)] based on trends for tensile properties shall be made to

estimate the service life of the tested sealing element.

9.5. Hydrogen Sulfide Aging Resistance

9.5.1 General

Testing shall be per manufacturer testing procedure. All relevant

documentation including test methods and test results shall be submitted

to Saudi Aramco for review and approval. Testing shall fulfill the

minimum requirements given in Table 9.2 below.

Table 9.2 – Minimum Test Requirements for H2S Resistance

Test Condition Required Value

Static Pressure, PSI 1000 minimum

Gas Composition, H2S content; mole% 5% minimum

Test Temperature 175°F (75°C)

Exposure Duration 96 hours minimum

9.5.2 Approval Criteria

The following property changes are acceptable for elastomeric sealing

element under H2S aging test.

Tensile strength; ±10%

Elongation; ±5%

50% modulus; -20% / +50%

100% Modulus; -20% / +20%

Hardness; + / -3 units

Swelling; +10% / -5%

9.5.3 Test Report

A test report containing the tests results highlighted in 9.5.2 shall be

submitted to Saudi Aramco for assessment and approval.




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9.6 Rapid Gas Decompression Testing Requirements

9.6.1 General

Rapid gas decompression, RGD, occurs in all types of fluid handling

devices, including valves, hoses, compressors, and in many other

equipment. Rapid decompression is also known as explosive

decompression (ED), an operational condition during which the applied

system pressure is quickly released, resulting in the expansion of

absorbed gas damaging elastomeric seals. Below is a typical example

for an O-ring that experienced ED.

Typical example of an o-ring that experienced rapid gas decompression

and blistering.

9.6.2 Test Conditions

Test conditions for ED shall be those given below in Table 9.3.

Table 9.3 – Minimum Required Conditions for Explosive Decompression

Testing Using O-Ring Test Fixture Pressure Vessel Apparatus or

Autoclave Apparatus with Free-Standing O-Ring Test Samples

Test Conditions Required Minimum Value

Static pressure, psi 2000

Fluid composition 5% CO2 , 95% CH4 and 100% CO2

Test temperature 100°C 212°F, 150°C, 302°F

or process temperature

Exposure Duration 48 hours




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Test Conditions Required Minimum Value

Hold Period 1 hour

Decompression pressure range 0 psi

Decompression rate 1000 psi/minute

Number of pressurization/decompression cycles

5

O-ring squeeze 14 - 22%

Groove fill 70%-90%

9.6.3 Common Elastomers

Elastomers that are commonly used in ED shall be those highlighted in

Table 7.0 above.

9.6.4 RGD Test Specimens

The standard test specimen shall be an O-ring seal of size; cross section:

5.33 mm, ID: 37.47 mm according to BS 1806. A minimum of 3 seals

shall be tested.

9.6.5 Failure Criteria

The failure criterion for ED shall be based on NORSK M-710 standard

internal inspection rating method commonly used in the oil and gas

industry. Test seals are cut into 4 equal quadrants and each section is

rated as described in Table 9.4. Seals with rating 4 or 5 are classified as

not acceptable.

Table 9.4 – Description of Rating Number System

for Each Seal Cross Section Surface

Description Rating

No internal cracks, holes or blisters of any size # 0

Less than 4 internal cracks, each shorter than 50% of cross section with a total crack length less than the cross section.

# 1

Less than 6 internal cracks, each shorter than 50% of the cross section, with a total crack length of less than 2,5 times the cross section.

# 2

Less than 9 internal cracks of which max. 2 cracks can have a length between 50% and 80% of the cross section.

# 3

More than 8 internal cracks or one or more cracks longer than 80 % of the cross section.

# 4 *

Crack(s) going through cross section or complete separation of the seal into fragments.

# 5 *




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* Seals with rating 4 or 5 are not acceptable.

9.6.6 Test Report

Record the rating of each seal by listing the individual ratings for each cut

section in the order of the highest first to the lowest last. Thus, a rating for

a whole seal of 1000 means that one cut section had a few small cracks of

rating #1 but no other cut section had any crack at all. Rating of 5422

would mean that one section had one or more cracks going through seal

cross section, one section had more than 8 cracks or at least one longer

than 80% of seal cross section and the other two sections had less than

6 cracks of which each were shorter than 50% of seal cross section.

The “overall rating” for a set of three replicate seals is defined on a worst

case basis as the highest rating for each cross section over the three

replicates. Thus, if the rating for 3 seals were 1110, 3110, 2220, the

overall rating would be 3220 and the seal had passed the test.

Comparisons between materials shall be based on overall ratings made

on the same basis and with the same number of replicate seals.

The test report shall also state the following:

a) Date of tests.

b) Seal reference information, batch number, elastomer type, trade

name, manufacturer, date of curing, etc.

c) Composition of test fluid.

d) Initial observations.

e) Temperature records, including heating and cooling.

f) Test pressure records, including decompression and re-pressurization.

g) Rapid gas decompression damage by rating system in Table 9.4.

h) Any other observations or records, e.g., photographs of seal sections

and any nonconformance from the described test procedure.

Revision Summary

10 September 2011 New Saudi Aramco Materials System Specification. 3 March 2013 Editorial revision to change the document responsibility from Materials and Corrosion

Control to Non-metallic Standards Committee.




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Annex A – Guidelines for the Chemical Resistance of Oilfield Elastomers

Table A-1 – Guidelines of the Chemical Resistance of Oilfield Elastomers

SERVICE NBR HNBR FKM FEPM FFKM

Corrosion Inhibitors, amine based

Poor Excellent Poor Excellent Excellent

Corrosion Inhibitors, K2CO3 based

Poor Fair to good Poor Excellent Excellent

Crude Oil, sour (<2,000 ppm H2S)

Poor Excellent Fair to good Excellent Excellent

Crude Oil, sour (>5% H2S) Poor Poor Poor Excellent Excellent

Crude Oil, sweet Fair to good Fair to good Excellent Fair to good Excellent

Explosive Decompression (ED)

Poor Excellent Poor Excellent Excellent

Hydraulic Fluid, oil/water (HFA)

Fair to good Excellent Poor Excellent Excellent

Hydraulic Fluid, water/glycol (HFC)

Excellent Excellent Excellent Excellent Excellent

Hydraulic Fluid, phosphate ester (HFD)

Poor Poor Excellent Poor Excellent

Hydrogen Sulfide, dry Poor Excellent Poor Excellent Excellent

Hydrogen Sulfide, wet Poor Fair to good Poor Excellent Excellent

Methyl Alcohol (Methanol) Excellent Excellent Poor Excellent Excellent

Methyl Ethyl Ketone (MEK) Poor Poor Poor Poor Excellent

Steam Poor Fair to good Poor Excellent Excellent

Toluene Poor Poor Excellent Fair to good Excellent

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