NFPS Offshore Compression Complexes Project COMP2

COMPANY Contract No.: LTC/C/NFP/5128/20

CONTRACTOR Project No.: 033734

Document Title

:

PIPING WELDING AND NDE SPECIFICATION FOR CP6S AND CP7S COMPLEXES

COMPANY Document No.

: 200-20-CE-SPC-00019

Saipem Document No.

: 033734-B-D-30-SPM-MA-S-10007

Discipline

: CORROSION ENGINEERING

Document Type

: SPECIFICATION

Document Category/Class

: 1

Document Classification

: INTERNAL

00

B

A

24-Jul-2023

Approved for Construction

D. Firmansyah

23-May-2023

27-Mar-2023

Issued for Approval

D. Firmansyah

Issued for Review

D. Firmansyah

H. Jaya

H. Jaya

H. Jaya

C. Borghesan

C. Borghesan

C. Borghesan

REV.

DATE

DESCRIPTION OF REVISION

PREPARED BY

CHECKED BY

APPROVED BY

Saipem S.p.A.

THIS DOCUMENT IS PROPERTY OF QATARGAS. THIS DRAWING OR MATERIAL DESCRIBED THEREON MAY NOT BE COPIED OR DISCLOSED IN ANY FORM OR MEDIUM TO THIRD PARTIES, OR USED FOR OTHER THAN THE PURPOSE FOR WHICH IT HAS BEEN PROVIDED, IN WHOLE OR IN PART IN ANY MANNER EXCEPT AS EXPRESSLY PERMITTED BY QATARGAS.

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REVISION HISTORY

Revision

Date of Revision

Revision Description

A1

A

B

00

28-Feb-2023

Issued for Inter-Discipline Check

27-Mar-2023

23-May-2023

24-July-2023

Issued for Review

Issued for Approval

Approved for Construction

HOLDS LIST

Hold No

Hold Description

Hold for EPCI document number of Specification for Piping Fabrication, Inspection, Preservation and Testing.

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TABLE OF CONTENTS

1

2

3

4

5

INTRODUCTION …5

1.1 PROJECT OBJECTIVE …5 1.2 PROJECT SCOPE …5

DEFINITIONS AND ABBREVIATIONS …7

2.1 DEFINITIONS …7 2.2 ABBREVIATIONS …8

REGULATIONS, CODES AND STANDARDS … 11

3.1 COMPANY DOCUMENTS … 11 3.2 PROJECT DOCUMENTS … 11 3.3 CONTRACTOR DOCUMENTS … 12 INTERNATIONAL CODES AND REGULATIONS… 12 3.4

3.4.1 3.4.2 3.4.3 3.4.4 3.4.5 3.4.6 3.4.7

API–American Petroleum Institute … 12 ASME–American Society of Mechanical Engineers … 12 ASNT–American Society for Nondestructive Testing … 13 ASTM–American Society for Testing and Materials … 13 AWS–American Welding Society … 14 BSI–British Standards Institute … 14 NACE–National Association of Corrosion Engineers … 14

SCOPE … 15

GENERAL REQUIREMENTS … 15

5.1 WELDING DOCUMENTATION … 16 5.2 WELDING REQUIREMENTS … 16 5.3 PROCESSES … 17 5.4 GAS TUNGSTEN ARC WELDING PROCESS (GTAW) … 19 5.5 GAS METAL ARC WELDING PROCESS (GMAW) … 19 5.6 FLUX-CORED ARC WELDING PROCESS (FCAW) … 20 5.7 SUBMERGED ARC WELDING PROCESS (SAW) … 20

6

CONSUMABLES … 20

6.1 GENERAL … 20 6.2 LOW HYDROGEN ELECTRODES … 21 6.3 USAGE LIMITATIONS … 21

7

WELDING PROCEDURE SPECIFICATION QUALIFICATIONS … 22

7.1 GENERAL … 22 7.1.1 DISSIMILAR WELDS … 23 7.2 ADDITIONAL ESSENTIAL VARIABLES … 23 7.3 HARDNESS TESTING … 23

8

9

WELDER AND WELDING OPERATORS QUALIFICATIONS … 24

PREHEAT AND INTERPASS TEMPERATURE … 25

10

POST WELD HEAT TREATMENT … 26

10.1 GENERAL … 26 10.2 THERMOCOUPLE REQUIREMENTS … 27

11

12

SOCKET WELDS … 28

FIT-UP AND ALIGNMENT… 29

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12.1 GENERAL … 29 12.2 CLEANING … 29 12.3 TEMPORARY ATTACHMENTS … 30 12.4 ALIGNMENT … 30

13

WELD REPAIRS … 30

13.1 GENERAL … 30 13.2 REPAIRS TO PWHT COMPONENTS … 31

14

15

16

17

18

WELD AND WELDER TRACKING SYSTEM … 32

BENDING AND FORMING … 33

MATERIAL TRACEABILITY … 33

DOCUMENTATION REQUIREMENTS … 33

APPENDICES … 35

18.1 TABLE 1 – APPLICABLE NDE ACCEPTANCE CRITERIA … 35 18.2 TABLE 3 – MINIMUM ONSHORE INSPECTION REQUIREMENTS – PIPING … 35 18.3 TABLE 4 – MINIMUM OFSHORE INSPECTION REQUIREMENTS … 40 18.4 ADDITIONAL REQUIREMENTS FOR WELDING OF CARBON STEELS AND LOW ALLOY STEELS IN SOUR SERVICE … 41 18.5 ADDITIONAL REQUIREMENTS FOR WELDING OF STAINLESS STEELS … 41 GENERAL REQUIREMENTS … 41 18.5.1 SPECIFIC REQUIREMENTS FOR SOUR SERVICE … 41 18.5.2 18.6 ADDITIONAL REQUIREMENTS FOR WELDING OF DUPLEX/SUPER DUPLEX STAINLESS STEELS … 41 GENERAL REQUIREMENTS … 41 18.6.1 ADDITIONAL SPECIFIC REQUIREMENTS FOR SOUR SERVICE … 43 18.6.2 18.7 ADDITIONAL REQUIREMENTS FOR WELDING OF NICKEL-BASED ALLOY … 43 GENERAL REQUIREMENTS … 43 18.7.1 18.7.2 ADDITIONAL SPECIFIC REQUIREMENTS FOR SOUR SERVICE … 44 18.8 ADDITIONAL REQUIREMENTS FOR WELDING OF CRA CLADDED CARBON STEELS … 44 GENERAL REQUIREMENTS … 44 18.8.1 18.8.2 ADDITIONAL SPECIFIC REQUIREMENTS FOR SOUR SERVICE … 44 18.9 ADDITIONAL REQUIREMENTS FOR WELDING OF TITANIUM … 45 GENERAL REQUIREMENTS … 45 18.9.1 SPECIFIC REQUIREMENTS FOR SOUR SERVICE … 45 18.9.2 NON-CONVENTIONAL ULTRASONIC INSPECTION METHODS … 46 18.10 TOFD (AS A SUPPLEMENT TO PULSE ECHO METHOD) … 46 18.10.1 PHASED ARRAY … 46 18.10.2 18.10.3 APPENDIX 1: OFFSHORE TESTING REQUIREMENT AND NDT EXTENT BY PIPING 47 CLASS

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1

INTRODUCTION

The North Field is the world’s largest natural gas field and accounts for nearly all of the state of Qatar’s gas production. The reservoir pressure in the North Field has been declining due to continuous production since the early 1990s. The principal objective of the NFPS Project is to sustain the plateau from existing QG South Operation (RL Dry Gas, RGE Wet gas) and existing QG North Operation (QG1 & QG2) production areas by implementing an integrated and optimum investment program consisting of subsurface development, pressure drop reduction steps and compression. Refer to the figure below for a schematic of the North Field.

Qatargas Operating Company Limited is leading the development of the North Field Production Sustainability (NFPS) Project.

1.1 Project Objective

The objective of this Project includes:

• Sustain the Qatargas North Field Production Plateau by installing new Compression Complex facilities CP6S & CP7S in QG south with integration to the existing facilities under Investment #3 program.

• Facility development shall be safe, high quality, reliable, maintainable, accessible, operable,

and efficient throughout their required life.

• Achieve standards of global excellence in Safety, Health, Environment, Security and Quality

performance.

1.2 Project Scope

The Project Scope includes detailed engineering, procurement, construction, transportation & installation, hook-up and commissioning, tie-in to EXISTING PROPERTY and provide support for start- up activities of the following facilities and provisions for future development. The WORK shall be following the specified regulations, codes, specifications and standards, achieves the specified performance, and is safe and fit‐for‐purpose in all respects.

Offshore CP6S and CP7S Compression Complexes that are part of QG-S RGE facilities as follows:

• CP6S Compression Complex • Compression Platform CP6S, Living Quarters LQ6S, Flare FL6S • Bridges BR6S-2, BR6S-3, BR6S-4, BR6S-5 • Bridge linked Tie-in to RP6S

Production from existing wellheads (WHP6S & WHP10S) and new wellhead (WHP14S) are routed via riser platform RP6S to compression platform CP6S to boost pressure and export to onshore via two export lines through the existing WHP6S pipeline and a new 38” carbon steel looping trunkline from RP6S (installed by EPCOL). CP6S is bridge-linked to RP6S.

• CP7S Compression Complex • Compression Platform CP7S, Living Quarters LQ7S, Flare FL7S • Bridges BR7S-2, BR7S-3, BR7S-4, BR7S-5 • Bridge linked Tie-in to RP7S

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CP7S shall receive production from existing wellheads (WHP5S & WHP7S) and new wellhead (WHP13S). There is only one export line for CP7S through the existing export pipeline from WHP7S. CP7S is bridge-linked to RP7S.

RGA Complex Destressing

Migration of the Electrical power source, Telecoms, Instrumentation and Control systems from WHPs and RPs hosted by RGA to the respective Compression Complexes listed below:

• WHP6S, WHP10S, WHP14S, RP6S and RP10S to CP6S Compression Complex • WHP5S, WHP7S, WHP13S and RP7S to CP7S Compression Complex

Destressing of Telecoms, Instrumentation and Control system in RGA Complex Control Room, which would include decommissioning and removal of telecom system devices and equipment that would no longer be required post migration and destressing activity.

Onshore

An Onshore Collaborative Center (OCC) will be built under EPC-9, which will enable onshore based engineering teams to conduct full engineering surveillance of all the offshore facilities. The OCC Building will be located in Ras Laffan Industrial City (RLIC) within the Qatar Gas South Plot. MICC & Telecommunication, ELICS related scope will be performed in the OCC building.

Figure 1: NFPS Compression Project COMP2 Scope

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2 DEFINITIONS AND ABBREVIATIONS

2.1 Definitions

Definition

Description

COMPANY

Qatargas Operating Company Limited.

EPCI CONTRACTOR

Saipem S.p.A.

CONTRACTOR

The entity who performs the work according to the contract (see details in section 4 of this document)

DELIVERABLES

FACILITIES

All products (drawings, equipment, services) which must be submitted by CONTRACTOR to COMPANY at times specified in the contract. All machinery, apparatus, materials, articles, components, systems and items of all kinds to be designed, engineered, procured, manufactured, constructed, supplied, tested and permanently installed by CONTRACTOR at SITE in connection with the NFPS Project as further described in Exhibit 6.

fabricated,

MILESTONE

A reference event splitting a PROJECT activity for progress measurement purpose.

PROJECT

NFPS Offshore Compression Complexes Project COMP2

SITE

SUBCONTRACT

SUBCONTRACTOR

VENDOR

to

(i) any area where Engineering, Procurement, Fabrication of the FACILITIES related the CPS6S and CP7s Compression Complexes are being carried out and (ii) the area offshore required for installation of the FACILITIES in the State of Qatar. Contract signed by SUBCONTRACTOR and EPCI CONTRACTOR for the performance of a certain portion of the WORK within the Project. Any organization selected and awarded by CONTRACTOR to supply a certain Project materials or equipment or whom a part of the WORK has been Subcontracted. The person, group, or organization responsible for the design, manufacture, the Equipment/Material.

load-out/shipping

testing,

and

of

WORK

Refer to article 2 of CONTRACT AGREEMENT.

WORK PACKAGE

The lowest manageable and convenient level in each WBS subdivision.

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2.2 Abbreviations

Code

Definition

ACG

AFC

ANSI

API

ASME

ASTM

AWS

BS EN

BSI

BW

CR

CRA

CS

CVN

DAC

DMW

DN

DSS

EPCI

FCAW

GMAW

GTAW

HAZ

HV

Angle Corrected Gain

Approved for Construction

American National Standards Institute

American Petroleum Institute

American Society of Mechanical Engineers

American Society for Testing and Materials

American Welding Society

British Standard European Norm

British Standards Institute

Butt Weld

Cap Repair

Corrosion Resistant Alloy

Carbon Steel

Charpy V Notch

Distance Amplitude Curve

Dissimilar Metal Weld

Diametre Nominal

Duplex Stainless Steel

Engineering, Procurement, Construction and Installation

Flux-Cored Arc Welding

Gas Metal Arc Welding

Gas Tungsten Arc Welding

Heat-Affected Zone

Hardness Vickers

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Code

Definition

ID

IQI

ISO

KPI

LAS

MAG

MDMT

MHz

MIG

ml

mm

MPa

MT

MTR

NACE

NCR

NDE

NPS

PAUT

PMI

PQR

PT

PTFE

PTR

Inside Diameter

Image Quality Indicator

International Organization for Standardization

Key Performance Indicator

Low Alloy Steel

Metal Active Gas

Minimum Design Metal Temperature

Megahertz

Metal Inert Gas

milliliter

millimeter

Megapascal

Magnetic Particle Testing

Material Test Report

National Association of Corrosion Engineers

Non-Conformance Record

Non-Destructive Examination

Nominal Pipe Size

Phased Array Ultrasonic Testing

Positive Material Identification

Procedure Qualification Record

Penetrant Testing

Polytetrafluoroethylene

Partial Through Repair

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Code

Definition

Post-Weld Heat Treatment

Preliminary Welding Procedure Specification

Radiographic Testing

Submerged Arc Welding

Supreme Council for the Environment and Natural Reserves

Super Duplex Stainless Steel

Shielded Metal Arc Welding

Stainless Steel

Sulphide Stress Cracking

Socket Weld

Thermocouple

Time Corrected Gain

PWHT

pWPS

RT

SAW

SCE

SDSS

SMAW

SS

SSC

SW

TC

TCG

TOFD

Time of Flight Diffraction

TTR

UT

UTS

VT

WPS

WWTS

YS

Through Thickness Repair

Ultrasonic Testing

Ultimate Tensile Strength

Visual Testing

Welding Procedure Specification

Weld and Welder Tracking System

Yield Strength

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3 REGULATIONS, CODES AND STANDARDS

In general, all design activities shall confirm to legal and statutory regulations and recognized industry best practices. Conflict among applicable specification and / or codes shall be brought to the attention of the COMPANY for resolution COMPANY decision shall be final and shall be implemented. The latest editions of codes and specification effective as on date of contract shall be followed.

In general, the order of precedence shall be followed:

a) Qatari Governmental and Regulatory Requirements

b) COMPANY Procedures, Policies and Standards (Exhibit 5 Appendix I)

c) Project Specifications.

d) Industry Codes and Standards

e) COMPANY and CONTRACTOR’s Lessons Learned

If CONTRACTOR/SUBCONTRACTOR deems any deviations from the specifications will result in significant project cost and schedule saving, proposal to such deviations shall be submitted to COMPANY for review and approval. CONTRACTOR/SUBCONTRACTOR shall not proceed with any deviation to the specifications without prior COMPANY approval.

The following is a list of relevant regulations, codes, standards, specification, Company documents that shall be considered for the Project in the order of precedence listed above.

3.1 Company Documents

S. No

Document Number

Title

PRJ-PJL-PRC-004_07

Facilities Engineering and Vendor Document Numbering Procedure

3.2 Project Documents

S. No

Document Number

Title

200-20-CE-SPC-00014

200-20-PI-SPC-00019

Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes Specification for Piping Fittings for CP6S and CP7S Complexes

200-20-PI-SPC-00023

Specification for Pipe for CP6S and CP7S Complexes

200-20-PI-SPC-00014 (HOLD)

Specification Preservation and Testing

for Piping Fabrication,

Inspection,

200-20-CE-SPC-00018

CRA Weld Overlay for Piping Materials Specification for CP6S and CP7S Complexes

200-20-CE-SPC-00020

Specification for Positive Material Identification (PMI) for CP6S and CP7S Complexes

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S. No

Document Number

Title

200-20-PI-SPC-00015

Piping Material Specification Complexes

for CP6S and CP7S

200-20-PI-SPC-00016

Specification for Manual Valves for CP6S and CP7S Complexes

200-20-PI-SPC-00017

Specification for Flanges and Hubs for CP6S and CP7S Complexes

3.3 Contractor Documents

S. No

Document Number

Title

COMP2-SPM-PE-PRC- 00001

Document Numbering Procedure

3.4

International Codes and Regulations

3.4.1 API–American Petroleum Institute

S. No

DOCUMENT NO.

DOCUMENT TITLE

12. API RP 2X – 2014 (R2020)

13. API RP 582 – 2016

14. API SPEC 2B – 2021

15. API SPEC 6A – 2022

Recommended Practice for Ultrasonic and Magnetic Examination of Offshore Structural Fabrication and Guidelines for Qualification of Technicians

Welding Guidelines for the Chemical, Oil, and Gas Industries

Specification for the Fabrication of Structural Steel Pipe

Specification for Wellhead and Christmas Tree Equipment

3.4.2 ASME–American Society of Mechanical Engineers

S. No

DOCUMENT NO.

DOCUMENT TITLE

16. ASME B16.25 – 2017

Buttwelding Ends

17. ASME B31.3 – 2022

Process Piping

18. ASME B31.8 – 2022

19. ASME BPVC Sec. V –

2023

20. ASME BPVC Sec. VIII Div.1 – 2023
21. ASME BPVC Sec. IX –

2021

Gas Transmission and Distribution Piping System

Nondestructive Examination

Rules for Construction of Pressure Vessels – Division 1

Welding, Brazing, and Fusing Qualifications

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3.4.3 ASNT–American Society for Nondestructive Testing

S. No

DOCUMENT NO.

DOCUMENT TITLE

22. ASNT SNT-TC-1A – 2020

Recommended Practice, Personnel Qualification and Certification in Nondestructive Testing

3.4.4 ASTM–American Society for Testing and Materials

S. No

DOCUMENT NO.

DOCUMENT TITLE

23. ASTM A370 – 2019

Standard Test Methods and Definitions for Mechanical Testing of Steel Products

24. ASTM A578 – 2017

Specification for Straight Beam Ultrasonic Examination of Plain and Clad Steel Plates for Special Applications

25. ASTM A923 – 2023

for Detecting Detrimental Standard Test Methods Intermetallic Phase in Duplex Austenitic/Ferritic Stainless Steels

26. ASTM E94 – 2022

Standard Guide for Radiographic Examination

27. ASTM E165 – 2018

Standard Practice for Liquid Penetrant Examination for General Industry

28. ASTM E384 – 2022

Standard Test Method for Microindentation Hardness of Materials

29. ASTM E562 – 2019

Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count

30. ASTM E709 – 2021

Standard Guide for Magnetic Particle Testing

31. ASTM E747 – 2018

Standard Practice for Design, Manufacture and Material Grouping Classification of Wire Image Quality Indicators (IQI) Used for Radiology

32. ASTM E1815 – 2018

Standard Test Method for Classification of Film Systems for Industrial Radiography

33. ASTM E2491 – 2013

(R2018)

Standard Guide for Evaluating Performance Characteristics of Phased-Array Ultrasonic Testing Instruments and Systems

34. ASTM E2700 – 2020

Standard Practice for Contact Ultrasonic Testing of Welds Using Phased Arrays

35. ASTM G48 – 2011 (R2020)

Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution

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3.4.5 AWS–American Welding Society

S. No

DOCUMENT NO.

DOCUMENT TITLE

36. AWS A3.0 – 2020

Standard Welding Terms and Definitions

37. AWS A5.01 – 2019

Welding and Brazing Consumables – Procurement of Filler Metals and Fluxes

38. AWS A5.32 – 2011

Welding Consumables-Gases and Gas Mixtures for Fusion Welding and Allied Processes

39. AWS 5.X

Filler Metal & Consumables Specification

3.4.6 BSI–British Standards Institute

S. No

DOCUMENT NO.

DOCUMENT TITLE

40. BSI BS EN ISO 11699-1 –

2011

Non-Destructive Testing - Industrial Radiographic Film - Part 1: Classification of Film Systems for Industrial Radiography (ISO 11699-1:2008)

41. BSI BS EN ISO 4063 –

2023

42. BSI BS EN ISO 17663 –

2009

Welding and allied processes. Nomenclature of processes and reference numbers

Welding – Quality requirements for heat treatment in connection with welding and allied processes

3.4.7 NACE–National Association of Corrosion Engineers

S. No

DOCUMENT NO.

DOCUMENT TITLE

43. NACE MR0175 / ISO 15156 – 2020

Petroleum and Natural Gas Industries – Materials for Use in H2S-Containing Environments in Oil and Gas Production

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4 SCOPE

This specification specifies the welding and inspection requirements for all process piping, cladded piping and components, including offshore production, upstream processing, terminals, and other processing facilities fabricated to ASME B31.3 [17] and B31.8 [18]. This specification is also to be read in conjunction with 200-20-PI-SPC-00014 “Specification for Piping Fabrication, Inspection, Preservation and Testing” [5] (HOLD).

The application will limit to the following:

• Fabrication shop, yard, and offshore site piping welding of B31.3 and B31.8.

• B31.3 or B31.8 piping within skids or packages at VENDOR.

• Girth welds of valves/instruments to the pup piece at VENDOR/SUPPLIER.

• Welding of handlers on spectacle blinds or welding of lugs on heavy valves/flanges if allowed at

VENDOR/SUPPLIER.

The word “CONTRACTOR” as written in this specification refers to the entity who perform the welding and inspection WORKS and contractually engaged and instructed to apply this specification. It refers to any of the following premises:

• CONTRACTOR construction, both at yard/workshop and site/offshore.

• SUBCONTRACTOR fabrication, both at yard and workshop.

• VENDOR or SUPPLIER, limited to the application as outlined above.

For the cases stated at the last two bullets, there shall be no direct contractual relationship between VENDOR/SUPPLIER/SUBCONTRACTOR and COMPANY. All communications with COMPANY and document review/approval process shall be performed through EPCI CONTRACTOR (SAIPEM S.p.A). When approval of COMPANY is required, this must be understood that EPCI CONTRACTOR’s approval shall be obtained first.

5 GENERAL REQUIREMENTS

All welds on or to the pressure boundary shall be performed with weld procedures qualified in accordance with this specification and ASME B31.3 [17] or B31.8 [18] as applicable or with an equivalent code or standard when approved by COMPANY.

In case of a conflict between this specification and other codes and standards, CONTRACTOR shall notify COMPANY for resolution. In all cases, the more stringent requirement shall apply.

All Welders and Welding Operators shall be qualified in accordance with ASME B31.3 [17] / ASME B31.8 [18], ASME SEC IX [21], and this specification.

CONTRACTOR shall provide, at its cost, all facilities, materials, and equipment for testing Welders and qualifying WPS.

Pressure containing components intended for H2S service shall be fabricated in compliance with NACE MR0175/ISO 15156 [43] requirements, 200-20-CE-SPC-00014 “Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes” [2] and other specifications referenced under Section 3.3.

NACE MR0175/ISO 15156 [43] is an industry standard that outlines established limits of H2S partial pressure above which precautions against SSC are considered necessary.

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NACE MR0175/ISO 15156 [43] gives requirements and recommendations for the selection and qualification of metallic materials used in oil and gas production facilities in H2S-containing environments. The NACE specification supplements, but does not replace, the materials requirements given in the appropriate design codes, standards, or regulations.

5.1 WELDING DOCUMENTATION

• A summary of documentation requirements and associated timelines is provided for

CONTRACTOR reference in this specification.

• All welding documentation shall be submitted in English. All WPS and PQR submissions shall follow the format of and include all information required by forms QW-482, “Suggested Format for Welding Procedure Specifications (WPS),” and QW-483, “Suggested Format for Procedure Qualification Records (PQR),” of ASME SEC IX [21].

• All WPS with supporting PQR shall be submitted to COMPANY for review and approval prior to fabrication. This applies to all WPS/PQR’s of Vendors, Sub-Vendors, Sub-contractors and Contractor, which shall only submit documents which are compliant with the code and the specification requirements.

• CONTRACTOR shall develop a weld matrix table that identifies each WPS as to its application, materials, type of joint, etc. The weld map shall be submitted with the associated WPS and PQR for review and approval at least 2 weeks prior to fabrication.

• All WPS previously qualified and meeting the requirements of this specification shall not have been qualified any earlier than 7 years from the project contract date. Any WPS with a qualification date greater than 7 years shall be requalified in accordance with this specification unless waived in writing by COMPANY. When existing PQRs subjected to impact test are proposed, all the supplementary essential variables shall be implemented and the filler metal brand shall be the same as WPS and PQR. Also, any revision in the governing code impacting the applicable essential and/or supplementary essential variables shall require re-qualification of WPS with COMPANY approval.

• All Welder Qualification Records shall be made available by CONTRACTOR to COMPANY for review prior to fabrication. When requested, the records shall be made available as a formal submission for review and approval.

• CONTRACTOR shall develop a Weld Log for tracking purposes that identifies the weld number which contains the status and repair number and the appropriate WPS used. The Weld Log shall be available to COMPANY upon request and shall be maintained through completion of the project.

• VENDOR shall establish and maintain a Welder Performance Log to track welder achievement status. VENDOR shall have a system to ensure that welder not meeting the stipulated KPI level/expectations will be excluded from the project. Welder with poor performance that has been retrained are subjected to COMPANY approval before resuming working for the project. The Welder Performance Log shall be made available to COMPANY upon request and shall be kept updated throughout project execution.

5.2 WELDING REQUIREMENTS

• All welds shall be multiple pass welds.

• All butt, branch, and integrally reinforced branched connections shall be full penetration welds. Integrally reinforced branched connections shall follow the guidelines of ASME B31.3 [17] standards.

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• All welding processes shall be protected from wind, rain, and other harmful weather conditions

that can affect weld quality.

• All welding equipment shall be calibrated prior to any production welding. Status of calibration

must be displayed near the welding equipment and subjected for COMPANY review.

• All applicable WPS shall be posted in the vicinity of welding, or the Welder shall have convenient

access to the WPS.

• Backing rings, bars, or straps shall not be used unless specifically approved by COMPANY in

writing.

• Hot or cold peening of weld deposits and/or base materials shall not be performed and shall be

cause for rejection.

• All arc strikes, starts, and stops shall be confined to the welding groove.

• At the discretion of COMPANY, any pipe that is arc-burned shall be cut out or repaired and inspected. When arc strikes outside the bevel are observed on sour service lines, corrective actions shall be specified and agreed via NCR process. Repair and inspection shall require complete removal of the arc strike by grinding and the area examined by MT or PT method. To ensure complete removal of the HAZ, further examination by use of an etchant is required. CONTRACTOR shall propose etchant application procedure as well as a verification of remaining minimum wall thickness after grinding operation to obtain COMPANY approval.

5.3 PROCESSES

• The welding processes outlined in Table 1 shall be approved for use, provided they comply with all requirements outlined in this specification. Process designations according to AWS A3.0M/A3.0 [36] are preferred on WPS-PQR forms. Equivalent BSI BS EN ISO 4063 [41] process designations are listed for convenient reference. If BSI BS EN ISO 4063 [41] designations are employed, then the designations shall be employed on both WPS and PQR.

Table 1: Acceptable Welding Processes

AWS A3.0M/A3.0

BSI BS EN ISO 4063

Designation Process Description Designation Description

SMAW

GTAW

GTAW-P

GMAW-S

Shielded Metal Arc Welding

ISO 4063- 111

Shielded metal arc welding (metal arc welding with covered electrode)

Gas Tungsten Arc Welding

ISO 4063- 141

Gas tungsten arc welding using inert gas and solid filler material (wire/rod)

Gas Tungsten Arc Welding - Pulsed Mode

Gas Metal Arc Welding - Short Circuit Transfer Mode

ISO 4063- 141-P

ISO 4063- 131-D

ISO 4063- 135-D

Gas tungsten arc welding using inert gas and solid filler material (wire/rod) and pulsed mode

Gas metal arc welding using inert gas, solid wire electrode, and short- circuit transfer mode

Gas metal arc welding using active gas, solid wire electrode, and short- circuit transfer mode

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AWS A3.0M/A3.0

BSI BS EN ISO 4063

Designation Process Description Designation Description

GMAW-G

Gas Metal Arc Welding - Globular Transfer Mode

GMAW-Sp

Gas Metal Arc Welding - Spray Transfer Mode

GMAW-P

Gas Metal Arc Welding - Pulsed Transfer Mode

FCAW-G

Flux-Cored Arc Welding - Gas Shielded

SAW

Submerged Arc Welding

ISO 4063- 131-G

ISO 4063- 135-G

ISO 4063- 131-S

ISO 4063- 135-S

ISO 4063- 131-P

ISO 4063- 135-P

ISO 4063- 132

ISO 4063- 136

Gas metal arc welding using inert gas, solid wire electrode, and globular transfer mode

Gas metal arc welding using active gas, solid wire electrode, and globular transfer mode

Gas metal arc welding using inert gas, solid wire electrode, and spray transfer mode

Gas metal arc welding using active gas, solid wire electrode, and spray transfer mode

Gas metal arc welding using inert gas, solid wire electrode, and pulsed transfer mode

Gas metal arc welding using active gas, solid wire electrode, and pulsed transfer mode

MIG welding with flux-cored electrode, Flux-cored arc welding with shielding using inert gas

MAG welding with flux-cored electrode, Flux-cored arc welding with shielding using active gas

ISO 4063- 121

Submerged arc welding with solid wire electrode

ISO 4063- 122

Submerged arc welding with strip electrode

• All other welding processes proposed for fabrication shall be submitted, in writing, for

COMPANY approval during bid evaluation proceedings.

• Nitrogen shall not be used for gas shielding of stainless steel, unless specifically allowed in the

appendixes relevant to different applications (e.g., DSS/SDSS).

•

Inert gas backing shall be used for all alloy materials, except for CS and CrMo steels with nominal chromium content ≤ 1.25% by weight.

• Fit-up and welding sequence shall be selected to ensure that specified tolerances for straightness are not exceeded. If such tolerances are not stated in the drawings, standards, or specifications, then the applicable section of the relevant code shall govern.

• Welded joints shall be made by completing each layer before subsequent layers are deposited. Block welding is prohibited, unless prior written approval is obtained from the COMPANY.

• Vertical welding shall be performed vertically up, unless specifically approved, in writing, by

COMPANY.

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• Unless approved in writing by COMPANY, welding processes using coatings or fluxes shall not

be used for austenitic stainless steel, nickel, or aluminum alloy root passes.

RATIONALE: Processes utilizing coated consumables or fluxes should not be used for the root of one- sided welds due to concerns with weld slag potentially reducing the corrosion resistance of the inner surface of the weld.

To achieve adequate fusion, most electrode coatings and fluxes contain corrosive materials that dissolve protective oxides. Fluorides, as an example, are included in the coatings of stainless steel electrodes and some of these fluorides remain in the slag after welding. Unless the slag is completely removed, these fluorides may leach into moisture (e.g., condensation) and/or process fluids potentially producing a highly corrosive acid.

The underside of a root pass, which may be covered with slag if the SMAW process is used, is of special concern when access prevents the removal of the slag. The use of an inert gas welding process without flux-containing filler metal will overcome this problem.

Weld roots produced with coated consumables or fluxes may be acceptable for select applications when the alloy is used for properties other than corrosion resistance (e.g., cryogenic applications). Applications of slag producing processes for weld roots, without cleaning and inspection of the ID weld surface, will require careful evaluation of the alloy, consumable, and application to be performed on a case by case basis.

5.4 GAS TUNGSTEN ARC WELDING PROCESS (GTAW)

• GTAW shall only be used with the addition of filler metal and high-frequency arc starting

equipment.

• A GTAW root and hot pass shall be required for the following circumstances:

a. Single-sided welded, full penetration joints.

• The addition or deletion of consumable inserts for single-sided welded butt joints shall require a

separate WPS and PQR qualification.

• A gas lens shall be used with GTAW unless approved otherwise by COMPANY.

• Except as specified in the appendixes for exotic materials, Argon purity shall be minimum

99.99%.

5.5 GAS METAL ARC WELDING PROCESS (GMAW)

• GMAW-S or GMAW-G shall not be used on integrally reinforced branched connections, nozzles,

reinforced nozzles, branch welds, couplings, socket welds, and other attachments.

• GMAW-S process may only be used under the following conditions:

a. The root pass for any material thickness, regardless of product form (e.g., pipe, plate,

etc.).

b. Fill and cap passes on butt-welds and fillet welds on pressure and non-pressure components, provided the wall thickness of neither member exceeds 10 mm (0.375 in.) and that any vertical welding is performed with uphill progression.

c. Fit-up welding that will subsequently be completely removed by back gouging, chipping,

or grinding.

• Modified short arc GMAW (STT®, RMD™, or similar) shall be considered a GMAW-S process.

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• The use of a modified short arc GMAW process (STT®, RMD™, or similar) for production welding shall require an equipment-specific weld procedure qualification record. The equipment Manufacturer and model listed on the PQR shall be the same as used in production.

5.6 FLUX-CORED ARC WELDING PROCESS (FCAW)

• FCAW-S process shall not be used.

• For FCAW-G, the maximum electrode diameter shall not exceed 1.5 mm (0.0625 in.).

• The FCAW-G process shall not be used for the root pass in single-sided welding.

• FCAW-G production consumables shall be restricted to Manufacturer, trade name, and

classification qualified on the PQR.

• Austenitic stainless FCAW-G weld deposits intended for exposure to temperatures above 538°C (1000°F) during fabrication (i.e., a weld that must be PWHT may experience these temperature excursions) and/or during service shall be made with bismuth-free consumables with bismuth levels in deposited weld metal that do not exceed 0.002% (20 ppm).

5.7 SUBMERGED ARC WELDING PROCESS (SAW)

• Requalification is required when the welding flux Manufacturer and/or trade name is changed

from what is qualified on the PQR.

• SAW shall be limited to mechanized welding processes. Manual or semi-automatic SAW is not

permitted.

• Active, alloy, and recrushed slag-type SAW fluxes shall not be used.

6 CONSUMABLES

6.1 GENERAL

• CONTRACTOR shall procure consumables according to the guidelines listed in AWS

A5.01M/A5.01 [37] for consumables and in AWS A5.32M/A5.32 [38] for shielding gases.

• CONTRACTOR shall develop a welding consumable control procedure that outlines the requirements for proper receipt, storage, baking, holding, distribution, exposure time, and re- baking as applicable for all welding consumables.

• CONTRACTOR shall submit the welding consumable control procedure to COMPANY for review and approval prior to fabrication. This applies to direct and also subcontracted work.

• All welding consumables used for fabrication shall be clearly labelled, supported by properly documented Manufacturer’s MTR, and properly controlled to maintain batch traceability to the Manufacturer’s MTR.

• All welding consumables shall be from approved sources only and be supplied with Type 3.1

certificate. Batch testing will be carried out at COMPANY’s discretion.

• Filler metals and fluxes shall be stored and/or handled in a manner to avoid damage to them or to the containers that they were received in from Supplier. Those in open containers shall be protected from deterioration.

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• Filler metals and fluxes that show signs of damage, contamination, or deterioration shall not be

used and shall be removed from work area.

• SMAW electrodes classified under AWS A5.1/A5.1M or AWS A5.5/A5.5M as E6012, E6013,

E7014, E7020, and E7024 are not acceptable for pressure- containing welds.

• Composite metal cored GMAW electrodes classified under AWS A5.18/A5.18M as ExxC shall

not be permitted for pressure-containing welds.

• SAW flux that has fallen on the floor or ground shall not be recycled.

• Gases shall not be field intermixed in their containers.

• Gases that are of questionable purity, and those in containers that show signs of damage, shall

not be used and shall be removed from the work area.

6.2 LOW HYDROGEN ELECTRODES

• Low-hydrogen consumables shall be protected from moisture and stored and handled in accordance with Manufacturer’s recommendations. Unless otherwise specified by the filler material Manufacturer, the consumables shall be stored in a heated storage oven once the original packaging is opened. A specific procedure shall be put in place by the CONTRACTOR with COMPANY approval that specifies time, temperature, oven and quiver requirement especially in a high relative humidity.

• Use of heated storage ovens shall be required for low-hydrogen electrodes, flux, and/or other consumables that may be subject to moisture absorption. Unless specified otherwise by the filler material Manufacturer, the storage oven shall be maintained at a temperature of 120°C (250°F). The calibration records for oven shall be maintained up to date and displayed at visible location near the oven for verification purpose.

• For pressure-containing carbon steel welds, low-hydrogen processes and consumables capable of delivering ≤ 8 ml/100 g of weld metal hydrogen shall be used for all fill and cap weld passes.

• Low-hydrogen consumables capable of delivering ≤ 4 ml/100 g of weld metal hydrogen shall be used for all welding that involves steels susceptible to hydrogen embrittlement (cold crack) i.e., when any of the following conditions apply:

a. Welding of carbon steels where the minimum specified yield is ≥ 415 MPa (≥ 60 ksi) or

the specified minimum tensile strength exceeds 587 MPa (85 ksi).

b. For fillet and groove welds in carbon steel when the base metal thickness exceeds 25

mm (1.0 in.).

c. For fillet and groove welds in low-alloy carbon steels when the base metal thickness

exceeds 12 mm (0.5 in.).

d. Welding of carbon steel restrained joints where high stresses are expected to develop

during fabrication and/or repair.

6.3 USAGE LIMITATIONS

• Low-carbon grades of austenitic stainless steel shall be joined with low-carbon weld metal of

corresponding composition.

• The following filler metal classification shall be selected to weld the following type of alloys:

a. ER-CuNi for Copper-Nickel Alloy 90/10

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b. ER/ENiCrMo-3 for Nickel-Based Alloy 625 or 825

• Nickel-based consumables containing niobium, such as ERNiCrMo-3, ERNiCrMo-6, and

ERNiCr-3, shall not be used for welding the following materials:

a. Duplex stainless steels (e.g., S32750, S32760, and S32101) having a nitrogen content

0.20%

b. Alloy 20 (N08020)

• An all-weld-metal tensile test shall be performed on deposited weld metal that does not fall within any AWS classification of the A5.XX series when the filler material is PWHT or MTR and when other certifications are not available. The tensile test shall determine the UTS, YS, elongation, and reduction of area.

• Base metal and filler metal combinations not meeting the recommendations of Annex A, Table A.1 of API RP 582 “Carbon and Low-alloy Steel” [13] shall be submitted for COMPANY approval.

7 WELDING PROCEDURE SPECIFICATION QUALIFICATIONS

7.1 GENERAL

• Weld consumables shall only be used within the AWS Specification and Classification limits or within the limits specified by the Manufacturer. (For example, polarity, position, heat treat conditions/limitations shall be in conformance with consumable classification. Consumables qualified for use in the as-welded condition shall not be assumed to be acceptable for use after PWHT.)

• For GTAW, GMAW, and FCAW processes, the PQR shall include the composition and flow rate

of inert gas backing when used.

• Additional WPS qualifications shall be performed whenever the essential variables or specific

requirements as specified in this document are violated.

• Repair welding procedures, if different from the original fabrication WPS, shall be qualified in accordance with this Section and submitted to COMPANY for approval prior to fabrication.

• For single-sided welds in wall thicknesses > 19 mm (0.75 in.) – where CVN testing is required – , additional CVN tests shall be taken in the weld root unless the consumable used on the root is rated/tested for the MDMT or lower.

• Each combination of welding processes shall be qualified and tested as one WPS/PQR. Individual welding processes qualified separately and then combined for production welding shall not be allowed.

• Austenitic stainless weld deposits intended for exposure to temperatures above 538°C (1000°F) during fabrication (e.g., highly likely that welds requiring PWHT will experience these temperatures) and/or during service shall demonstrate ferrite content does not exceed 9% when measured prior to PWHT.

• A welding process of a WPS used solely for the root pass may be eliminated without requalification for double-sided welded butt joints, provided that the original root pass must be removed prior to back welding, except for the cases where corrosion test is required for the root pass.

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7.1.1 DISSIMILAR WELDS

• A separate welding qualification shall be prepared for dissimilar welding and cladding and to be submitted for COMPANY approval prior to the proceedings. All dissimilar metal welds shall be qualified separately for each material combination.

• Dissimilar weld configurations directly exposed to sour service environments are not permitted

without explicit written approval from COMPANY.

• Any PWHT proposed for joints involving dissimilar materials shall require COMPANY approval.

• Welds between dissimilar materials shall be examined by the method used for the material

requiring the more stringent examination.

• Selection of filler metals for dissimilar welds shall be in accordance with section 6.2, API RP 582

[13].

7.2 ADDITIONAL ESSENTIAL VARIABLES

• Essential variables of this section shall be complied during welding procedure qualifications in addition to the essential and supplementary essential variables (as applicable) from ASME SEC. IX [21] and ASME B31.3 [17] code.

• When supplementary essential variables are applied, WPS qualification shall be in the 3G position for plate and the 5G or 6G position for pipe. For mechanized or semi-automatic weld procedures to be used in the 2G position, the weld procedure shall be qualified in either the 6G position or the 2G plus 5G positions. For SAW or any other mechanized/automatic welding process used in 1G Rotated position, qualification in 1G position may be used.

• COMPANY may permit Qualification in another position if it can be shown that the qualification

position best represents the production welding position.

• The WPS shall be requalified whenever the following occurs:

a. For ferritic steels, wire chemistry is changed from one AWS classification to any other

classification or to a chemical composition not covered by an AWS classification.

b. The chemical composition of the weld deposit is changed from one A-Number to any other A-Number in Table QW-442, “A-Numbers,” of ASME SEC IX [21], including a change from A-1 to A-2 and vice versa.

c. Flux-cored electrodes are changed from one AWS classification to another, electrodes are not classified by AWS, or electrodes are specified with supplementary requirements. Requalification is not required for a change in the position designator from EX0T-X to EX1T-X and vice versa.

d. For impact-tested WPS, a change in the filler material Manufacturer or trade name from

that used for qualification.

7.3 HARDNESS TESTING

• All WPS utilized for welding equipment with hardness requirements shall be supported by PQRs hardness tested in accordance with ASTM E384 [28] using a Vickers indenter and a 10 kg load. The qualification hardness test shall be performed on a coupon in the same final thermal condition (e.g., PWHT) as the production weld it is intended to qualify.

• Hardness tests shall be performed on a macro section of the full thickness of the weld.

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• Hardness surveys shall be done in accordance with project specification 200-20-CE-SPC- 00014 “Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes” [2] and NACE MR0175/ISO 15156 [43].

• Unless specified otherwise, the maximum hardness for P-1 materials shall be 250 HV10. For unexposed CS weld cap to the sour environment, 275 HV10 may be considered for weld cap surface (WCL, Base Metal, and HAZ).

• The PQR shall document all hardness testing performed on the test coupon.

8 WELDER AND WELDING OPERATORS QUALIFICATIONS

• All Welders and Welding Operators employed by CONTRACTOR for fabrication shall satisfactorily pass performance qualification tests in accordance with ASME B31.3 [17] / B31.8 [18], ASME SEC IX [21] and this specification prior to any fabrication welding.

• Welder and Welding Operator qualification on production welds shall be strictly prohibited.

• CONTRACTOR shall employ only those Welders who have successfully passed COMPANY-

approved qualification tests.

• Unless the COMPANY resident inspector is presently at site or if approved by Inspection Test Plan otherwise, CONTRACTOR shall provide 2 weeks advanced notice to COMPANY when conducting Welder qualification tests to provide COMPANY Representative the opportunity to witness. Test results shall be approved by COMPANY based on approved procedures.

• CONTRACTOR shall maintain records of all Welder qualification tests and shall furnish copies

to COMPANY for approval prior to fabrication.

• Forms for the qualification and/or certification records shall be similar to those shown in ASME SEC IX [21] NMA APP B, Form QW-484, “Suggested Format A for Welder Performance Qualifications (WPQ)”.

• CONTRACTOR shall provide COMPANY with a Welder qualification list of all qualified Welders

to be used for fabrication.

• The Welder qualification list shall include the name of the Welder, ID mark (welder identification mark), date of qualification, process, position, material, diameter, and thickness, WPS for which they are qualified.

• CONTRACTOR shall also provide an updated Welder qualification list upon COMPANY request

or whenever new welders are added to the list.

• COMPANY may accept previously qualified welders provided that all information submitted

confirms that the requirements of this specification have been met.

• All Welders shall have their first full penetration production weld radiographed on each system

requiring examination by radiography.

• All Welders who fail their initial qualification test or first production weld radiograph shall be

requalified only with COMPANY approval.

• The first Welder qualification coupon for each WPS having hardness requirements shall include a production hardness test in accordance with this specification and shall meet the hardness requirements established for the WPS.

• Each Welder’s first production weld for each NACE-CS, WPS with hardness requirements shall

be subject to hardness testing using portable hardness tool.

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• Welders’ identification shall be stamped on, or paint marked beside each piping weld made by

each Welder or Welding Operator.

•

If approved used for CRA the paint and markers shall be limited to low-chloride products suitable for use on stainless steels.

• All welding shall be performed by a qualified Welder per COMPANY-approved WPS, including

all attachment and tack welds.

• For GMAW process, a change in the mode of transfer from short-arc to any other transfer mode

(i.e., globular, spray, pulsed) shall require a new Welder qualification test be performed.

• CONTRACTOR shall immediately remove any Welder from the project that, in the opinion of

COMPANY, is careless, incompetent, or negligent in the performance of duties.

9 PREHEAT AND INTERPASS TEMPERATURE

• Preheat temperatures shall be as specified in CONTRACTOR qualified WPS but shall not be less than that required by COMPANY-approved WPS. The recommendations outlined in Table 330.1.1, “Preheat Temperatures,” of ASME B31.3 [17] shall be considered mandatory.

• The preheat temperature shall be applied throughout the entire thickness of the weld and at

least 75 mm (3 in.) on each side of the weld.

• For carbon steels, exclude the CRA or cladded, with UTS > 490 MPa (70 ksi), the preheat

temperature shall be 80°C (175°F) minimum.

• Materials that require preheat for welding shall be preheated also prior to gouging, and tack

welding.

• Preheat shall be performed by using oxy-fuel bulbous-type torches, induction, or electric-

resistance heating methods.

• The maximum welding interpass temperature shall be the highest obtained during qualification work piece of approved welding procedure; and shall not exceed stated temperature in Table 2. The interpass temperature shall be measured within the joint bevel or on top of the weld.

Table 2: Maximum Inter-pass Temperatures

Material Group

Maximum Interpass Temperature

P-1, P-4, P-5 (Carbon and low-alloy steels)

P-6 – 12Cr (410 SS)

P-6 – 12Cr4Ni (CA6NM)

P-7 (410S)

P-8 (Austenitic stainless steels)

P-41, P-42 (e.g., Alloy 400)

P-43 including Cladded, P-44, P-45 (e.g., Alloy 825, Alloy 625, C-276)

315°C (600°F)

315°C (600°F)

345°C (650°F)

260°C (500°F)

175°C (350°F)

150°C (300°F)

175°C (350°F)

• For carbon steel with wall thickness > 19 mm (0.75 in.) and preheat temperature is over than 100oC (not applicable for CRA or cladded), electric-resistance heating method shall be used. Any changes to this requirement shall be approved by COMPANY.

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• Preheating and inter-pass temperature monitoring shall be in accordance with a written practice

developed by CONTRACTOR and reviewed and approved by COMPANY.

• The base material shall be maintained at or above the preheat temperature until the weld is completed. For welds requiring preheat temperature of minimum 150°C (300°F), weld interruption shall be performed with adequate insulation to ensure slow cooling. Before welding can resume, the partially completed weld shall be 100% MT-inspected prior to preheating.

• Groove welds in ASME SEC IX [21], P-1 through P-5 materials with wall thickness ≥ 19 mm (0.75 in.) shall only be interrupted provided a minimum of 10 mm (0.375 in.) of weld metal has been deposited or 25% of the weld groove has been filled, whichever is greater. MPI to be done prior resuming the welding. Alternatively, preheat shall be maintained until welding is resumed.

10 POST WELD HEAT TREATMENT

10.1 GENERAL

• PWHT shall be in accordance with the material groupings (P-Nos. and Group Nos.) and ranges in ASME B31.3 [17] Table 331.1.1, except as provided in Table 331.1.2 and Table 331.1.3 or ASME B31.8 [18] as applicable. The thickness governing PWHT is defined under the section ASME B31.3- 331.1.3, which is the lesser of the thickness of the weld and thickness of the materials being joined at the weld or the thickness of the pressure containing material if the weld is attaching a non-pressure containing material to a pressure containing material. Other requirements also applicable here are described in 200-20-PI-SPC-00014 “Specification for Piping Fabrication, Inspection, Preservation and Testing” [5] (HOLD).

•

If PWHT is required, the CONTRACTOR shall provide an application specific PWHT procedure to COMPANY for review and approval prior to beginning fabrication. The procedure shall include details such as maximum heating rate, categorization as furnace or local PWHT, holding temperature (maximum and minimum), holding time, maximum cooling rate, and thermocouple placement (i.e., thermocouple map).

• All WPS shall specify whether PWHT shall be performed or not. Statements such as “PWHT if

required by ASME Code” shall not be acceptable and shall be cause for WPS rejection.

• All PWHT shall be in accordance with ASME B31.3 [17] / ASME B31.8 [18] accordingly as per the scope, this specification, ISO 17663 [42] and recommended practices outlined in API RP 582 [13].

• The adequacy of PWHT required to control hardness shall be checked by hardness measurements per the requirements of the ASME Code and this specification. Hardness measurements shall be provided on the qualifying PQR and in production during fabrication.

• All piping shall be adequately supported in the furnace during PWHT to minimize warping and/or

other distortion problems.

• For all piping requiring PWHT, CONTRACTOR shall inspect each individual spool 100% for dimensional compliance with the AFC drawings and all other fabrication requirements prior to PWHT.

• Assembled Valves shall not be subjected to furnace PWHT at piping fabrication shop/yard.

• PWHT of welds on SW and buttweld BW valves shall be performed in accordance with the valve

Manufacturer’s recommendations so that valve internals are not damaged.

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• When piping requires PWHT, socket-welded and seal-welded threaded connections (if permitted) for all pipe sizes shall also be PWHT. The minimum holding time at full PWHT temperature shall be 1 hour.

• Allowance for PWHT at lower temperature and longer hold times shall not be permitted unless

specifically approved by COMPANY.

RATIONALE: Lower PWHT temperatures may reduce the benefits of the heat treatment for some materials in certain service conditions. The lower temperatures would only be considered after a careful review of the material, weld consumables, service conditions, and Vendor experience and test data.

• Heat treatment requirements for welded joints or bends of materials not covered by ASME B31.3

[17] shall be submitted to COMPANY for approval.

• Any PWHT proposed for joints involving dissimilar materials shall require COMPANY approval.

• When welding N&T or Q&T materials, the maximum PWHT temperature shall be a minimum of

30°C (54°F) below the tempering temperature of the base material.

• All piping shall have its bore plugged during PWHT in order to eliminate the chimney effect.

• Time-temperature cycle records of the furnace, induction, or resistance method shall be prepared, and a copy furnished to COMPANY. These records shall identify the piece and/or weld numbers involved and show a continuous recording of the time-temperature cycle.

• For production PWHT applications, all uniquely identified PWHT charts shall be contained within the final as-built documentation for each weld. At least one piece, to be agreed by COMPANY, in each furnace load shall have a temperature recording sensor attached, and time/temperature data shall be included within final documentation.

• All temperature recording and measuring equipment shall have a current calibration certificate

prior to any PWHT activities.

• The use of exothermic kits, torches, or gas ring heaters shall not be used for PWHT.

• When local heat treatment is to be performed, a minimum of 300mm each side of the weld shall

be covered with thermal blankets.

10.2 THERMOCOUPLE REQUIREMENTS

• TCs shall be attached to the center of the weld by capacitor discharge methods.

• As a minimum, two TCs shall be used. One TC shall be employed for controlling the heat treatment parameters, and the other shall be used for monitoring and recording the heat treatment cycle via a clearly defined and uniquely identified chart.

• TCs shall be spaced equally around the circumference of the pipe or component. As a minimum,

the TC shall be at 3 o’ clock and 9 o’ clock positions.

• The minimum number of TCs for each pipe size shall be in accordance with the Table 3.

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Table 3: Minimum Number of Thermocouples

Pipe Size - Nominal

Control TC

Monitoring TC

≤ 254 mm (10 in.)

254 mm (10 in.) ≤ 457 mm (18 in.)

1

1

1

2

TC shall be spaced at 450 mm (18 in.) around the circumference of the pipe or component and shall have alternating control TC and monitoring TC.

TC shall be spaced at 450 mm (18 in.) around the circumference of the pipe or component and shall have alternating control TC and monitoring TC.

457 mm (18 in.)

11 SOCKET WELDS

• Welding of socket-weld components shall meet the following requirements:

a. Fillet size per ASME B31.3 [17].

b. Minimum of two passes that shall be visually verifiable.

c. Fit-up procedure developed by CONTRACTOR to ensure the gap between socket and

pipe is adequately maintained.

• Socket-welded valves and union shall meet the following requirements:

a. Weld with a welding process that controls heat input to minimize distortion.

b. Hand close metal-seated valves DN 19 mm (NPS 0.75 in.) and larger before welding.

c. Remove seats from all metal-seated valves DN 12.7 mm (NPS 0.50 in.) and smaller

before welding.

d. Remove seats from all socket-weld and threaded valves with non-metallic seats.

•

If seal welding of threaded connections is required, then they shall be welded per ASME B31.3 and the following additional requirements:

a. A minimum two-pass weld shall cover all exposed threads and be visually verifiable.

b. For seal welding of threaded valves, the requirements listed in Item (2) above shall be

followed for socket-weld valves.

c. Connection shall be made without the use of sealing compound or PTFE tape.

d. All thread cutting oil shall be completely removed prior to welding.

• Fabricated laps or stub-ends shall be per ASME B31.3 [17].

• Prior to welding, socket-welded components shall require a gap of 1.2 mm to 2.4 mm (0.0625

in. to 0.25 in.) between pipe end and socket bottom.

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12 FIT-UP AND ALIGNMENT

12.1 GENERAL

• Surfaces to be welded shall be smooth and free from cracks, tears, laminations, or other defects that could compromise the quality or strength of the weld. Weld joints containing defects shall be cut back until the weld surfaces are smooth and UT- and MT- or PT-examined to confirm the defects have been completely removed.

• Weld joint preparation, spacing, and alignment shall be in accordance with the approved WPS, ASME B31.3 [17], ASME B16.25 [16], and the additional requirements of this specification.

• Weld bevels shall be prepared by machining or mechanically guided flame cutting machine. PQR shall be qualified based on the process used. Hand beveling shall not be performed.

• Pipe ends shall be accurately aligned and spaced as indicated in the WPS.

• Tack welds may be used in the weld grooves, provided that they are made by qualified Welders

following a COMPANY-approved WPS.

• Tacks not removed shall be totally fused into the completed weld.

• Line-up clamps, if used, shall be left in position until two continuous root welds, each equal to 25% of the circumference of the pipe, have been completed opposite each other (two welds X 25% circumference length each).

• Branch connection joints shall be prepared to permit full-penetration welds with quality equal to

the circumferential welds in the same piping system.

• Flange bolt holes shall straddle established pipe centerlines, unless another orientation is

required to match the flanged connections on equipment or per the AFC drawings.

• Longitudinal welded piping shall have the long seam weld staggered at the circumferential welds

by 90 degrees to each other.

• Longitudinal welded piping shall have the weld seam located so that welds for branch connections, pipe shoes, and other attachments are not located on the longitudinal weld seam.

• For piping and tubing up to and including Schedule 40, alignment clamps shall be used for butt-

welds.

12.2 CLEANING

• All scale, paint, oil, rust, dirt, oxides, and other foreign matter shall be thoroughly removed from the weld bevel area and at least 25 mm (1 in.) of adjacent surfaces before tacking or welding.

• Cleaning shall be performed in a manner that shall not lead to additional contamination of the

weld or adjoining base metal.

• Only stainless-steel brushes and tools shall be used on stainless steel and nickel-alloyed materials. Brushes and tools shall be new and shall not have been used on carbon steel.

• All torch-cut ends shall be smooth and free of oxide scale by filing or grinding.

• Uneven bevel faces shall be ground to a reasonably smooth and true surface.

• Flux, weld spatter, and slag shall be removed from the weld area after each weld pass.

• All pipe lengths shall be cleaned inside to remove all dirt, debris, or other foreign matter before

joints are aligned for welding.

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• Weld-through primers shall not be used unless they are qualified for each WPS for which they will be used. Additionally, the PQR shall state the Manufacturer and brand name used and shall be the same used for production welds. The qualified primer dry film thickness shall be recorded on the PQR.

12.3 TEMPORARY ATTACHMENTS

• Temporary welded attachments shall be performed in strict accordance with the approved WPS

for the material to be welded.

• The temporary welded attachment material shall be of the same material type (e.g., P No.) as

the piping to which it is welded.

• Temporary attachments that are required as fit-up aids shall only be removed by grinding or flame cutting no closer than 3 mm (0.125 in.) from the pressure boundary. The remaining attachment shall then be ground flush.

• Temporary attachments shall be removed before final heat treatment, pressure testing, and final

acceptance.

• All areas on pressure piping where temporary attachments have been welded shall be MT- or

PT-examined after final (or completed) attachment removal.

• For pressure piping in services with process-related hardness requirements, all areas where temporary attachments have been welded shall be MT- or PT-examined after cleaning with production hardness testing performed to ensure that the area complies with project requirements. If the piping is to be heat treated after the temporary attachments are removed, then hardness testing of the area shall be performed once the piping is in its final heat-treated state.

12.4 ALIGNMENT

• Radial misalignment at the joining ends of piping components shall be limited to 3 mm (0.125

in.) or one-fourth of the pipe wall thickness, whichever is less.

•

Internal radial misalignment exceeding 1.5 mm (1/16 in.) shall be taper trimmed such that the adjoining internal surfaces are flush. However, the resulting thickness of the welded joint shall not be less than the minimum design thickness plus corrosion allowance.

13 WELD REPAIRS

13.1 GENERAL

• CONTRACTOR shall develop a detailed repair procedure and submit to COMPANY for review and approval prior to fabrication or attempting any weld repairs. The procedure shall include weld and base material repairs, cover all repair techniques to be used (welding, grinding, etc.) and specify how defects are to be removed, repaired, inspected, and repairs documented.

• Defects found during fabrication shall be removed and re-welded using COMPANY- approved welding procedures. Repaired welds shall be inspected to the same requirements as required for the original weld but shall be MT- or PT-inspected as a minimum.

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• For CS and low alloy steel, when original weld WPS is used for repairs, the minimum preheating temperature for the weld repair shall be 50°C above the one applicable for original weld. However, whenever the original WPS preheating temperature exceeds 100°C, the minimum repair preheating temperature shall be 150°C but shall never be less than original WPS preheat temperature.

• When WPS for repairs is qualified by testing, the minimum preheating temperature applied for repairs shall be the one used in original weld WPS or the one qualified in the repair PQR, whichever the higher.

• Root defects, including excessive penetration, may be repaired by welding, grinding, or both

from either side, provided the method is part of the approved weld repair procedure.

•

If an alternate method of inspection is to be used other than the original weld requirements, CONTRACTOR shall submit the request to COMPANY in writing. The specific details of the inspection and technical justification that ensures the quality of the weld joint will meet or exceed the original weld acceptance criteria shall be included in the request.

• Prior COMPANY approval is required before beginning repairs in the following situations:

a. Weld repair depth exceeds 9.5 mm (3/8 in.) or one-half the weld thickness whichever is

less.

b. Defects are observed in plates or forgings.

c. More than one repair is required of the same defect.

d. Repair is required after PWHT.

e. Repair is to quenched and tempered material.

f. Repair is to material where the specified minimum yield strength exceeds 360 MPa

(52,000 psi).

• For weld repairs that do not employ the original WPS for the repair (e.g., SMAW used on SAW weld repair), the WPS shall be qualified by demonstrating the mechanical properties of the base metal and weld metal will not be degraded.

• CRA materials shall only be repaired once on the same area. All other materials shall not be

repaired more than twice on the same area.

• Pressure containing and CRA repairs should have COMPANY visibility if the welding has been

completed.

• CONTRACTOR shall be responsible for the repair of defects and for additional examinations or

tests resulting from those defects.

13.2 REPAIRS TO PWHT COMPONENTS

• Any proposals for repairs to components after completion of PWHT shall be submitted to

COMPANY for approval prior to any repairs being done.

• Repairing PWHT components without PWHT shall meet all the following requirements:

a. Proposal shall be submitted to COMPANY for approval and shall include but not be limited to the pipes, methodology of repair, maximum depth and length of repair, proposed test coupon information, etc.

b. CONTRACTOR has acquired COMPANY approval in writing.

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c. Repair WPS shall be qualified in accordance with this specification and the additional

requirements imposed by COMPANY.

d. Weld repair test coupon shall include the following:

i. Simulate the repair that will be made, including bevel angles, position, length of

repair, and depth of repair.

ii. Consist of a PWHT weld with identical thickness as the production weld.

iii. Employ the temper bead technique on all carbon steel and low-alloy materials.

iv. Complete all NDE and mechanical testing as directed by COMPANY.

v. All final NDE for carbon steel and low-alloy materials shall be performed after the material has been at ambient temperature for not less than 48 hours. The holding time can be reduced to 24 hours when approved by COMPANY’s Engineer.

e. The repair WPS shall be approved by COMPANY prior to any repair welding.

14 WELD AND WELDER TRACKING SYSTEM

• CONTRACTOR shall maintain records of all details related to Welder qualification data, Welder performance data, and production weld history for all field- and shop-welded piping systems.

• These records shall be captured in a WWTS computer database that collates the information

and generates templates to provide the following information:

a. Welder qualification details & date

b. Welder qualified thickness and diameter limits

c. Processes qualified per Welder

d. Welder identification number and symbol

e. Welder retraining and/or re-testing dates

f. Welder percentage rejected rate (both linear and per joint basis)

g. Weld number, drawing number, and service condition

h. Visual inspection date of weld

i. Original NDE date and report number of welds

j. Tracer shots for progressive examination of rejectable welds

k. Repair history of a weld with NDE date and report numbers

l. Weld status i.e, pending, rejected, repair 1, repair 2, accepted

m. PWHT reports per weld number

• The WWTS shall be capable of revision to provide additional information as required.

• The WWTS database requirement is not applicable to shop-fabricated skid piping.

• CONTRACTOR shall provide access to the WWTS computer database for COMPANY reference

and evaluation on a daily basis and shall ensure that the records are updated daily.

• SUBCONTRACTOR and VENDOR/SUPPLIER shall provide access to EPCI CONTRACTOR to

the computer database.

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• CONTRACTOR shall submit details of the WWTS proposed database (preferably live) for COMPANY approval and shall use an accessible software format (e.g., Excel, Access, etc.).

• A daily weld repair report shall be made available upon request and access strategy, and it is preferable to use Power B.I. or equivalent. A weekly summary report with analysis shall be submitted to COMPANY.

15 BENDING AND FORMING

• Bending and forming shall be in accordance with applicable codes, 200-20-CE-SPC-00014 “Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes” [2] and 200-20-PI-SPC-00023 “Specification for Pipe for CP6S and CP7S Complexes” [4].

16 MATERIAL TRACEABILITY

• Prior to start of fabrication, CONTRACTOR shall develop and submit a PMI procedure to

COMPANY for approval.

• The PMI procedure shall be in accordance with project specification 200-20-CE-SPC-00020 “Specification for Positive Material Identification (PMI) for CP6S and CP7S Complexes” [7].

• CONTRACTOR shall train and certify inspection personnel to the PMI procedure.

• All piping and piping components shall be adequately identified to prevent the misuse of

materials and to expedite inspection.

• Prior to the start of fabrication, CONTRACTOR shall develop and submit plan and/or procedures

for piping and piping component identification to COMPANY for review and approval.

17 DOCUMENTATION REQUIREMENTS

• Table 4 identifies the documentation that CONTRACTOR shall supply to COMPANY and the

timeframe in which the material shall be submitted.

Table 4: Documentation Requirements

Documentation Required

MTR for piping materials

Submitted

As material is received

Welding material Manufacturer’s MTR

As material is received

PMI procedure

PMI personnel qualifications

PMI reports

Prior to fabrication

Prior to fabrication

At project completion

Copies of all records of weld heat treatment

At project completion

RT film

NDE procedures

NDE reports

At project completion

Prior to fabrication

Prior to shipment

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Documentation Required

Brinell hardness test results

WPS

Welding PQR

Submitted

Prior to shipment

14 days prior to fabrication

14 days prior to fabrication

Welder performance qualification test records

Prior to fabrication

Qualified welder log

Duration of the project

Welder’s quality acceptance levels

Duration of the project

Weld maps

Weld & Inspection log

Weld rejection log

14 days prior to fabrication

Duration of the project

Duration of the project

Development and maintenance of weld maps

Prior to fabrication

Progressive examination procedure

Material control procedures

Prior to fabrication

Prior to fabrication

PWHT procedure (to include applicable Valve Manufacturer’s guidelines as required)

14 days prior to fabrication

Hardness testing procedure

Prior to fabrication

Quality plan

Quality control procedures

Documentation procedures

Inspection and Test plans

30 days prior to fabrication

30 days prior to fabrication

Prior to fabrication

Prior to fabrication

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18 APPENDICES

18.1 TABLE 1 – APPLICABLE NDE ACCEPTANCE CRITERIA

RT ASME B31.3, Table 341.3.2 (Normal Fluid)

UT

MT

PT

VT

ASME B31.3 ASME B31.3 ASME B31.3 ASME B31.3

ASME B31.8 ASME B31.8 ASME B31.8 ASME B31.8 ASME B31.8

Process Piping

ASME B31.8 Piping

18.2 TABLE 3 – MINIMUM ONSHORE INSPECTION REQUIREMENTS – PIPING

Table 3–1: Inspection for P-1 and P-8 Welds in Non-Sour Service (1) (2)

P-1 & P-8 P-1 MDMT warmer than and equal to -29°C (-20°F) P-8 MDMT warmer than -100°C (-150°F)

Weld Type

P-1 (Low Temperature Service)

P-8 (Cryogenic Service)

ANSI Class 600 and lower

ANSI Class 900 and higher

ANSI Class 300 and lower

ANSI Class 600 and higher

ANSI Class 150

ANSI Class 300 and higher

Girth Butt- Welds (4)

Longitudinal Butt-Welds (6)

AC

AE

AE

AE

AD

AE

AE

AE

ADF

AEF

AEF

AEF

Pipe-to-pipe branch connections (including reinforcing pads) and branches made with integrally reinforced branched connection fittings and pipe couplings

Pressure- containing fillet welds (socket welds, seal welds, etc.) (8)

AF

AF

AF

AG

AF

AG

A

AF

A

AF

AF

AF

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P-1 & P-8 P-1 MDMT warmer than and equal to -29°C (-20°F) P-8 MDMT warmer than -100°C (-150°F)

P-1 (Low Temperature Service)

P-8 (Cryogenic Service)

ANSI Class 600 and lower

ANSI Class 900 and higher

ANSI Class 300 and lower

ANSI Class 600 and higher

ANSI Class 150

ANSI Class 300 and higher

A

AF

A

AF

AF

AF

Weld Type

Attachment welds to pressure parts (non-pressure- containing welds)

Table 3–2: Inspection for P-1 and P-8 Welds in Non-Sour Service

Weld Type

Girth Butt-Welds (4) Longitudinal Butt-Welds (6) Pipe-to-pipe branch connections (including reinforcing pads) and branches made with integrally reinforced branched connection fittings and pipe coupling Pressure-containing fillet welds (socket welds, seal welds, etc.) (8) Attachment welds to pressure parts (non-pressure containing welds)

High Alloy (P-7, P-41, P-42, P-43, P-44, P-45, P-10H, P-51)

Low Alloy Steels (P-4, P-5, P-6)

ANSI Class 600 and lower

ANSI Class 900 and higher

ANSI Class 600 and lower

ANSI Class 900 and higher

AC AE

AE AE

ACF AEF

AEF AEF

AG

AG

AG

AG

A

B

AF

A

AF

AF

AF

AF

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Table 3–3: Inspection for Welds in Standard Materials used for Sour Service

P-1 MDMT warmer than and equal to -29°C (-20°F)

P-8 MDMT warmer than -100°C (-150°F)

High Alloy (P-43, P-44, P-45, P- 10H, P-51)

ANSI Class 300 and lower

ANSI Class 600 and higher

ANSI Class 600 and lower

ANSI Class 900 and higher

ANSI Class 600 and lower

ANSI Class 900 and higher

ADF

AEF

AEF

AEF

AC

AE

AD

AE

AC

AE

AD

AE

AF

AG

AF

AG

AF

AG

AF

AF

A

AF

A

AF

AF

AF

A

AF

A

AF

Weld Type

Girth Butt- Welds (4) Longitudinal Butt-Welds (6) Pipe-to-pipe branch connections (including reinforcing pads) and branches made with integrally reinforced branched connection fittings and pipe couplings Pressure- containing fillet welds (socket welds, seal welds, etc.) (8) Attachment welds to pressure parts (non-pressure- containing welds)

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Table 3–4: Inspection for Welds in Non-Standard Materials in Sour Service (3)

Weld Type

Girth Butt-Welds (4) Longitudinal Butt-Welds (6) Pipe-to-pipe branch connections (including reinforcing pads) and branches made with integrally reinforced branched connection fittings and pipe coupling Pressure-containing fillet welds (socket welds, seal welds, etc.) (8) Attachment welds to pressure parts (non-pressure containing welds)

High Alloy (P-7, P-41, P-42)

All ANSI Classes

AEG AEG

Low Alloy Steels (P-4, P-5, P-6)

ANSI Class 300 and lower

ANSI Class 600 and higher

AEG AEG

AEGH AEGH

AG

AG

AGH

AF

AF

AF

AF

AFH

AFH

100% VT of all welds (9) Complete VT of at least 5% of all welds per ASME B31.3, Paragraph 341.4.1 (a) “Examination – Normal Fluid Service (Visual Examination)” (9) Minimum 5% of random RT or UT (8) (10) (11) (13) Minimum 10% of random RT or UT (8) (10) (11) (13) 100% RT or UT (8) 100% MT or PT (final pass only) (14) (15) 100% MT or PT (final pass and root pass) (14) (15) Acceptance criteria for welds shall follow the requirements for Severe Cyclic Conditions, as outlined in ASME B31.3, Table 341.3.2 “Acceptance Criteria for Welds and Examination Methods for Evaluating Weld Imperfections”.

Legend: A B

C D E F G H

Notes:

1. Requirements described in 200-20-PI-SPC-00014 “Specification for Piping Fabrication, Inspection, Preservation and Testing” [5] (HOLD) for Inspection NDE methods are to be read in conjunction with this appendix.

2. This Appendix does not apply to Category D fluid service. Category D piping shall be subject

to 100% VT in accordance with ASME B31.3, Paragraphs 341.4.2 “Examination”.

3. Category D Fluid Service” and 344.2 “Visual Examination”.
4. COMPANY reserves the right to select specific welds for inclusion into the minimum

percentages shown.

5. Non-standard materials include all materials not covered in Table 3–3. Non-standard materials are not to be used in sour service without a detailed review and explicit approval from COMPANY Materials Function. Including miter welds and insert-type contoured branch fitting welds.

7. These requirements are not applicable for the longitudinal welds in pipe made to an acceptable

API or ASTM specification.

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8. 5% of all socket welds and seal-welded piping shall be RT inspected for the purpose of

checking fit-up gap.

9. VT examination shall be performed per ASME B31.3, Paragraph 344.2 “Visual Examination”

and per this Specification.

10. RT and UT examination shall be performed per ASME B31.3, Paragraph 341.4.1 “Examination

– Normal Fluid Service” and per this specification as applicable. If random RT examination is specified, then it shall be done as soon as practicable after completion of welding of the designated lot and the results shall not be applied to any welds that have not been completed at the time of the RT examination. It is also not permissible to predesignate a Welder’s first production weld for RT examination and then use that radiograph to qualify production welds made after the RT examination.

12. As part of the minimum RT requirements, at least one weld for each weld procedure made by

each Welder shall be examined.

13. When the weld rejection ratio exceeds the agreed KPI, then RT or UT shall be increased to 100% and shall stay at 100% until the reject rate drops below 5% and stays there for 5 consecutive working days.

14. MT shall be performed per ASME B31.3, Paragraph 344.3 “Magnetic Particle Examination” and per Section this specification. PT shall be performed per ASME B31.3, Paragraph 344.4 “Liquid Penetrant Examination” and per Section this specification.

15. MT shall be applied for P-1 and low-alloy steels, and PT shall be applied for P-8 and high-alloy materials. PT as the substitute of MT for P-1 or low-alloy steel welds shall be subject to written approval by COMPANY.

16. When pneumatic test is approved by COMPANY, the requirements in this Appendix shall be

expanded to include the following, as a minimum:

17. For all pipe classes:
18. 100% RT for all butt-welds and 100% MT (for ferritic) or PT (for austenitic) for all pressure-

retaining fillet welds, regardless of piping service class.

19. For ANSI Class 150:
20. The additional requirements listed above (in 14.a) will not apply to the piping for instrument

air, plant air, and nitrogen.

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18.3 TABLE 4 – MINIMUM OFSHORE INSPECTION REQUIREMENTS

• Minimum required percentage of RT of all piping systems shall be in accordance with Table 4–

1. COMPANY reserves the right to select specific welds for inclusion into the minimum percentages shown.

Table 4–1: Minimum RT Requirements for Offshore Piping Systems (1) (4)

General Service

% Radiography

Acceptance Criteria

10% of ANSI Class 150 welds

Normal Service Criteria (Random) (2)

10% of ANSI Class 300 welds

Normal Service Criteria (Random) (2)

30% of ANSI Class 600 and greater welds (non-hydrocarbon service)

100% of ANSI Class 600 and greater welds (hydrocarbon service)

Normal Service Criteria (Random) (2)

Severe Cyclic Criteria (100%) (3)

Sour Service

% Radiography

Acceptance Criteria

30% of ANSI Class 150 welds

Normal Service Criteria (Random) (2)

30% of ANSI Class 300 welds

Normal Service Criteria (Random) (2)

100% of ANSI Class 600 and greater welds

Severe Cyclic Criteria (100%) (3)

Cryogenic Service

% Radiography

Acceptance Criteria

10% of ANSI Class 150 welds

Normal Service Criteria (Random) (2)

100% of ANSI Class 300 and greater welds

Normal Service Criteria (100%)

Notes:

As part of the minimum RT requirements, at least one weld for each weld procedure made by each Welder shall be examined.

If random RT examination is specified, then it shall be done as soon as practicable after completion of welding of the designated lot, and the results shall not be applied to any welds that have not been completed at the time of the RT examination. It is also not permissible to predesignate a Welder’s first production weld for RT examination and then use that radiograph to qualify production welds made after the RT examination.

Weld acceptance shall apply the Severe Cyclic Criteria whenever the piping line is under Severe Cyclic condition. Otherwise, the Normal Service as per ASME B31.3, Table 341.3.2 “Acceptance Criteria for Welds and Examination Methods for Evaluating Weld Imperfections” may apply.

This table is to be read in conjunction with the table “OFFSHORE TESTING REQUIREMENT AND NDT EXTENT” as provided in Appendix Section 18.10.3 of this document.

All piping under ASME B31.8 must be 100% RT + 100% MT (Note: PAUT may be used instead of RT as per the requirements of para. 18.10.

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18.4 ADDITIONAL REQUIREMENTS FOR WELDING OF CARBON STEELS AND LOW ALLOY

STEELS IN SOUR SERVICE

•

In addition to this specification, this Appendix shall be used in conjunction with applicable specification and applied for services that have been defined as sour per the requirements of NACE MR0175/ISO 15156 [43] and project specification 200-20-CE-SPC-00014 “Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes” [2] Clause 18. Fabrication.

• All welds shall be PWHT-ed regardless of thickness and the minimum PWHT temperature shall be as specified in 200-20-CE-SPC-00014 “Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes” [2] and NACE MR0175/ISO 15156 [43], whichever the higher.

18.5 ADDITIONAL REQUIREMENTS FOR WELDING OF STAINLESS STEELS

18.5.1 GENERAL REQUIREMENTS

• This Appendix is to be used in conjunction with this specification when fabricating austenitic

stainless-steel piping.

• 316L grades of stainless steel shall be welded with 316L SS consumables.

• Filler metal carbon content shall not exceed 0.03 wt%.

• All shielding and backing gases shall be procured in accordance with AWS A5.32M/A5.32.

• Argon gas shall be of min 99.995% purity for both, shielding and back purging. The gas purging shall be maintained until minimum 9.5 mm of weld throat has been achieved. Gas purging shall also be maintained when welding socket welds, seal, external attachments on SS pressure parts of thickness below 6.5 mm, refer to API RP 582 [13].

• The oxygen level in the back purge should be measured prior and during welding and should be

maximum 2000 ppm during welding.

18.5.2 SPECIFIC REQUIREMENTS FOR SOUR SERVICE

• All requirements listed in NACE MR0175/ISO 15156 [43] & 200-20-CE-SPC-00014 “Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes” [2] Clause 18 Fabrication shall be complied with, in addition to any other requirements specified in this specification.

18.6 ADDITIONAL REQUIREMENTS FOR WELDING OF DUPLEX/SUPER DUPLEX STAINLESS

STEELS

18.6.1 GENERAL REQUIREMENTS

• This Appendix is to be used in conjunction with this specification when fabricating 22Cr Duplex

and 25Cr Super Duplex Stainless Steel piping.

• All the below requirements and those specified by API RP 582 [13] for welding of DSS and SDSS

shall apply in full. The Pitting corrosion test is mandatory.

• No production welding shall be permitted until appropriate WPS and supporting PQRs are

approved by COMPANY.

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• Electrodes and filler metals (including wire & fluxes) shall be selected to deposit a nominal 22Cr Duplex or 25Cr Super Duplex Stainless Steel composition as per relevant AWS A 5.XY specifications and API RP 582 [13]. Nickel-based consumables containing Niobium shall not be used for welding of DSS/SDSS having N content over 0.2%.

• All shielding and backing gases shall be procured in accordance with AWS A5.32M/A5.32.

• Argon gas shall be of min 99.995% purity for both, shielding and back purging. The gas purging shall be maintained until minimum 9.5 mm of weld throat has been achieved. Gas purging shall also be maintained when welding socket welds, seal, external attachments on SDSS/DSS pressure parts of thickness below 6.5 mm, refer to API RP 582 [13].

• Nitrogen up to 2.5% may be added in Argon shielding gas.

• Maximum Interpass temperature shall not exceed the values specified in API RP 582 [13] or

those recorded in PQR, whichever the lower.

• The repair procedure shall be qualified separately for each type of repair (TTR/PTR/CR). For the PTR the remaining ligament shall be essential variable. CR require separate qualification only if it is single pass and intended to be performed on the side of the corrosive media.

• No local inside root repair is allowed. Such repair can only be performed as a full circumference back pass, if successfully qualified on a representative test coupon. Corrosion, Micro, Macro, Ferrite, Hardness Tests at 6, 3 and 12 o’clock location shall be performed when fixed position 5G or 6G is used for production back pass welding. For 2G and 1G Rotated positions, one specimen is sufficient for each test.

• Only one repair at same location is allowed. If the repair results in defects the weld shall be cut- out and rewelded, except as follows. Shallow partial repair that allows a new excavation to be performed in such a way that the full HAZ of the first partial repair is eliminated without excessive width of the final weld and which can still maintain the minimum qualified remaining ligament, may be proposed to Company representative for approval, on a case-by-case basis, prior any physical activity is being started.

• Only GTAW, GMAW, SMAW and SAW (Butt welds only) may be used for DSS/SDSS welding for shop, yard and site installation welding. GMAW shall not be used for branch/socket welding.

• For filling by SAW a minimum 9.5 mm shall be deposited prior starting SAW process.

• The oxygen level in the back purge shall be measured prior and during welding and shall be maximum 500 ppm. 1000 ppm may also be accepted for erection/installation tie-in welds, where conventional Argon purging systems is impractical, providing it is successfully qualified on PQR using “as welded” corrosion test specimens (without removing the oxidized layer on the inner surface). The accuracy of Oxygen analyser shall be 10 ppm or better.

• Unless agreed otherwise during the pWPS review, the following mechanical tests shall be carried out during welding procedure qualification and the acceptance criteria shall be defined as follows:

1. Micro examination test

The micro examination test to be performed in accordance with ASTM A923 Method A or other equivalent standards. Test specimen shall be extracted from 3 and 6 o’clock position. Photomicrograph shall be 400 to 500x. Microstructure of weld and HAZ shall show appropriate phase distribution and free of detrimental intermetallic phases.

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2. Macro and hardness test

Macro and hardness test to be carried out in accordance with ASTM E384 or other equivalent standards. Test specimen shall be taken from 6 and 12 o’clock position. The maximum hardness shall not exceed 350 HV10 for 25Cr (Super Duplex) and 320HV10 for 22Cr (Duplex).

3. Ferrite test

Ferrite test to be carried out in accordance with ASTM E562 or other equivalent standards. Ferrite test specimen shall be taken from weld metal and HAZ. The acceptance criteria shall be as follows:

a) Weld metal: 30 – 65%

b) HAZ: 35 – 65%

Ferrite in base metal shall be taken for reference and verification in case of HAZ ferrite test failure. The base metal shall be assessed versus material specification requirements.

4. Pitting corrosion test

Pitting corrosion test to be performed as per ASTM A923 Method C with acceptance criteria as per ASTM A923 Method C, except that no pitting is allowed.

Alternatively, ASTM G48 Method A may be used with test temperature minimum 35°C for 24-hour for 25Cr Super Duplex.

One (1) test specimen shall be extracted from 6 o’clock position. The acceptance criteria shall be no pitting at magnification of 20X and maximum weight loss 4g/m2.

5. CVN impact test

Impact test to be carried out in accordance with ASTM A370 or other equivalent standards at test temperature minimum -46°C. The acceptance criteria of absorbed energy values shall be:

a) Minimum 35J (average) and 27J (single) for Weld Metal,

b) Minimum 54J (average) and 43J (single) for HAZ.

Alternatively, acceptance criteria of ASTM A923 Method B may be applied, when tested at -40°C.

18.6.2 ADDITIONAL SPECIFIC REQUIREMENTS FOR SOUR SERVICE

• All requirements listed in NACE MR0175/ISO 15156 [43] & 200-20-CE-SPC-00014 “Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes” [2] Clause 18 Fabrication shall be complied with, in addition to any other requirements specified in this specification.

18.7 ADDITIONAL REQUIREMENTS FOR WELDING OF NICKEL-BASED ALLOY

18.7.1 GENERAL REQUIREMENTS

• This Appendix is to be used in conjunction with this specification when fabricating Nickel-based

alloy piping.

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• Argon gas shall be of min 99.995% purity for both, shielding and back purging. The gas purging shall be maintained until minimum 6.5 mm of weld throat has been achieved. Gas purging shall also be maintained when welding socket welds, seal, external attachments on Ni alloy pressure parts of thickness below 6.5 mm, refer to API RP 582 [13].

• The oxygen level in the back purge shall be measured prior and during welding and shall be maximum 1000 ppm. 2000 ppm may also be accepted for erection/installation tie-in welds, where conventional Argon purging systems is impractical.

18.7.2 ADDITIONAL SPECIFIC REQUIREMENTS FOR SOUR SERVICE

• All requirements listed in NACE MR0175/ISO 15156 [43] & 200-20-CE-SPC-00014 “Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes” [2] Clause 18 Fabrication shall be complied with, in addition to any other requirements specified in this specification.

18.8 ADDITIONAL REQUIREMENTS FOR WELDING OF CRA CLADDED CARBON STEELS

18.8.1 GENERAL REQUIREMENTS

• This Appendix is to be used in conjunction with this specification when fabricating CRA Cladded

Carbon Steel piping.

• No production welding shall be permitted until appropriate WPS and supporting PQRs are

approved by COMPANY.

• Argon Purity shall be 99.995%.

•

Inert gas backing shall be maintained for a minimum of 6.0 mm of weld deposit on all CRA clad or overlaid materials or as qualified during weld procedure qualification, whichever is the greater.

• The oxygen level in the back purge shall be measured prior and during welding and shall be maximum 1000 ppm. 2000 ppm may also be accepted for erection/installation tie-in welds, where conventional Argon purging systems is impractical.

• For filling by SAW a minimum 9.5 mm shall be deposited prior starting SAW or FCAW process.

• Welding with Copper or Ceramic backing shoes is not permitted.

• For Alloy 625 weld overlay groove welding, the iron content shall not exceed the values specified

in the applicable AWS A5.XY filler metal specification.

• SAW and FCAW process may only be used after a minimum of 9.5 mm weld throat has been

deposited by different approved processes.

18.8.2 ADDITIONAL SPECIFIC REQUIREMENTS FOR SOUR SERVICE

• All requirements below and those listed in NACE MR0175/ISO 15156 [43] & 200-20-CE-SPC- 00014 “Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes” [2] Clause 18 Fabrication shall be complied with.

(A) In addition to any other requirements related to welding procedure qualification specified

elsewhere, the following shall apply:

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(1) Macro examination shall be performed using the same methods as required for the overlay qualification. The specimens shall be centred in the weld centre line. Weldment areas (including weld + overlay HAZ + overlay) shall be examined.

(2) Pitting corrosion test as per G48 Method A at +50°C with specimens extracted in the same manner as required for the overlay qualification, refer to 200-20-CE-SPC-00018 [6].

(3) Hardness testing shall be carried out on the weld cross as per section 7.3 combined with the requirements of NACE MR0175/ISO 15156 [43]. The hardness samples shall be free of any cracks and the maximum hardness values shall not exceed 250 HV10 for C-Mn or Low Alloy Steel. 275 HV10 maximum hardness value may be accepted at Cap surface, not exposed to sour service. CRA hardness shall not exceed 345 HV10.

(B) PWHT requirements

The PWHT for CS or LAS Clad welding shall follow Code requirements only, refer to TQ- COMP2-SPM-CE-TQY-00003 / TQ- COMP2-SPM-CE-TQY-00004.

18.9 ADDITIONAL REQUIREMENTS FOR WELDING OF TITANIUM

18.9.1 GENERAL REQUIREMENTS

(1) This Appendix is to be used in conjunction with this specification when fabricating Titanium

piping.

(2) No production welding shall be permitted until appropriate WPS and supporting PQRs are

approved by COMPANY.

(3) Only GTAW welding process shall be used with gas purging and trailing gas until weld

completion.

(4) Argon purity shall be 99.999%.

(5) Dew point of gas shall be -54°C.

(6) Moisture removal shall be by electrical heated air.

(7) Welding shall commence immediately after weld preparation by machining and bevel

cleaning by Acetone.

(8) Providing that root colour tint is either clear silver or gold, the Oxygen in the backing gas

shall be as follows, unless qualified otherwise:

• maximum 20 ppm, for 3” NPS and below.

• max 50 ppm, for workshop welds over 3” NPS.

• max 100 ppm for any other cases.

(9) Joint cutting and preparation shall be performed only by mechanical means using dedicated

tools for Titanium welding.

18.9.2 SPECIFIC REQUIREMENTS FOR SOUR SERVICE

(1) N/A

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18.10 NON-CONVENTIONAL ULTRASONIC INSPECTION METHODS

(1) The below methods are described in regard of the cost-effectiveness solution they can bring or their capacity to inspect welds that are not readily inspectable by conventional Pulse Echo Technique. These are alternative NDE methods for critical applications in piping systems, where permanent records are considered desirable, by mutual agreement between CTR and CPY.

18.10.1

TOFD (AS A SUPPLEMENT TO PULSE ECHO METHOD)

(1) TOFD Inspection shall be carried out according ASME V article 4, appendices III and VII,

and applicable code cases.

(2) TOFD Inspection is not to be applied when High-Low is greater to 2.0 mm.

(3) TOFD procedure (to be submitted for COMPANY approval) shall show how the weld volume

is covered. Vertical sizing of defect shall be explained.

(4) Equipment requirements, as per ASME V article 4 appendix III-431-432 requirements.

a. Guiding mechanisms (magnetic rules) shall be used.

b. Sampling rate of the A-scan of at least 6 times of the nominal probe frequency but not

less than 100 MHz.

c. Highest possible TOFD probe frequency for near surface area coverage.

(5) Reference/Calibration blocks

a. ASME V article 4 appendix III shall apply.

b. ASME TOFD calibration block shall contain the far scanning surface connected notch (width 0.2 mm) and the near scanning surface side drilled hole (2.0 mm diameter).

(6) Qualification blocks

a. A Qualification demonstration on the qualification block is essential. The qualification targets (Surface and embedded notches) are used to prove the technique. Side drilled holes can also be made and provided in the same block and these targets will be used to set the system sensitivity. Therefore, one single block can also be used at times for qualification work as well as calibration purposes.

b. In addition to the reference blocks required by the present specification, the TOFD procedure shall be demonstrated on qualification blocks as per defined in the § 7.5.5.1 of the ASME Section VIII Div.2, code case B31.3-181-2 and ASME V article 4 mandatory appendices Mandatory appendix VIII.

(7) Acceptance criteria

a. Acceptance criteria are defined § 7.5.5.1 of the ASME Section VIII Div.2.

18.10.2

PHASED ARRAY

(1) PAUT shall be in semi-automated or automated mode.

(2) Equipment requirements, Ultrasonic Device:

a. Digitization of A-Scans at a minimum of five times the nominal frequency of the probe

used.

b. Amplitude digitized at a resolution of at least 8-bit (256 levels).

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c. Standardized for amplitude and height linearity in accordance with ASTM E2491 / ASME

BPVC Section V SE 2491: annually.

d. Other verification as per ASTM E2491 /ASME BPVC Section V SE 2491 shall be fulfilled.

(3) Equipment requirements, Transducers & Wedges:

a. Phased array element activity as defined in Appendix A.3 ASTM E2491 / ASME BPVC

Section V SE-2491.

(4) Examination level

a. Requirements of mandatory appendix VII of ASME BPVC Section V article 4 and recommended practices provided in ASTM E2700 / ASME BPVC Section V SE 2700 shall be fulfilled.

(5) Scan increment setting

a. The maximum recording increments shall be:

i.

ii.

0.04 in. (1 mm) for material < 3 in. (75 mm) thick.

0.08 in. (2 mm) for material ≥ 3 in. (75 mm) thick.

(6) Scan Plan

a. ASTM E2700 / ASME BPVC Section V SE 2700.

(7) Calibration/Reference blocks

a. Time base/sweep range setting (Velocity, wedge delay, exit points…) Sensitivity

balancing: IIW or Phased Array calibration block type A.

b. Sensitivity settings (DAC/ACG/TCG):

i.

ii.

iii.

Provisions of T434 of ASME BPVC Section V article 4.

For piping diameter > 6’’ and t > 20 mm, T-434.3-2 shall be used.

For examination from Nozzle ID surface, Nozzle weld blocks as per Fig. T434.5.1 of ASME BPVC Section V article 4 (Side drilled holes as per T434.2.1).

(8) Qualification blocks

a. appendix IX of ASME BPVC Section V article 4.

(9) Interpretation of Scans

a. Appendix P of ASME BPVC Section V article 4.

(10) Evaluation & Acceptance Criteria

a. Process piping: the acceptance criteria to be applied are those applicable to UT examination, and are defined in ASME B31.3 paragraph 344.6.2 or table K341.3.2 for chap IX-high pressure piping.

18.10.3

APPENDIX 1: OFFSHORE TESTING REQUIREMENT AND NDT EXTENT BY

PIPING CLASS

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APPENDIX 1 SECTION 18.10.3 OFFSHORE TESTING REQUIREMENT AND NDT EXTENT

Sl. No.

Line Classification sheet

Design Code

Basic Material

PWHT

Production Weld Hardness (See note 6)

PMI (See note 7)

NDT

Remarks

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

A1E

A5E

A6E (NACE) A7E (NACE)

ASME B31.3

ASME B31.3

ASME B31.3

ASME B31.3

A11A

ASME B31.3

A19A (NACE)

ASME B31.3

A33A

ASME B31.3

A34A (NACE) A34A1 (NACE)

ASME B31.3

ASME B31.3

A35B

ASME B31.3

A45B

ASME B31.3

B1E

ASME B31.3

B6E (NACE) B19A (NACE) B34A (NACE)

ASME B31.3

ASME B31.3

ASME B31.3

D5E

ASME B31.3

D6E (NACE) D7E (NACE)

ASME B31.3

ASME B31.3

D19A

ASME B31.3

D34A (NACE)

ASME B31.3

E5E

ASME B31.3

Piping: Carbon steel Piping: Low Temperature Carbon Steel Piping: Carbon steel Piping: Low Temperature Carbon Steel Piping: Stainless Steel 316/316L Piping: 25 CR Super Duplex Piping: Titanium Piping: Solid Inconel UNS N06625 (All sizes) Piping: Solid Inconel UNS N06625 (All sizes) Piping : Cu-Ni Piping : GRE (3” & Above) Piping: Carbon steel Piping: Carbon steel Piping: 25 CR Super Duplex Piping: Solid Inconel UNS N06625 (All sizes) Piping: Low Temperature Carbon Steel Piping: Carbon steel Piping: Low Temperature Carbon Steel Piping: 25 CR Super Duplex Piping: Solid Inconel UNS N06625 (All sizes) Piping: Low Temperature Carbon Steel

NO (See note 4) NO (See note 4)

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO (See note 4)

YES

NO

NO

NO (See note 4)

YES

YES

NO

NO

NO (See note 4)

NO

NO

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

YES

NO

NO

NO

YES

YES

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

NO

NO

NO

YES

YES

NO

NO

NO

YES

YES

NO

100% VT 10% RT 100% VT 10% RT 100% VT 30% RT 100% VT 30% RT 100% VT 10% RT 100% VT 30% RT 100% VT 10% RT 100% VT 30% RT 100% VT 30% RT 100% VT 10% RT

NO

100% VT 10% RT 100% VT 30% RT 100% VT 30% RT 100% VT 30% RT 100% VT 100% RT 100% VT 100% RT 100% VT 100% RT 100% VT 100% RT 100% VT 100% RT 100% VT 100% RT

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APPENDIX 1 SECTION 18.10.3 OFFSHORE TESTING REQUIREMENT AND NDT EXTENT

Sl. No.

Line Classification sheet

Design Code

Basic Material

PWHT

Production Weld Hardness (See note 6)

PMI (See note 7)

NDT

Remarks

ASME B31.3

ASME B31.3

Piping: Low Temperature Carbon Steel Piping: Solid Inconel UNS N06625 (All sizes)

YES

NO

Piping: Solid Inconel UNS N06625 (4” & below) Impact tested CS (-46 deg C) + UNS N06625 6mm Weld Overlay(6” & Above)

NO (See note 5)

ASME B31.3

ASME B31.3

F11A

ASME B31.3

Piping: Low Temperature Carbon Steel Piping: Stainless Steel 316/316L

ASME B31.3

Piping: Solid Inconel UNS N06625 (4” & below) Impact tested CS (-29 deg C) + UNS N06625 6mm Weld Overlay(6” & Above)

ASME B31.3

Piping: Solid Inconel UNS N06625 (All sizes)

ASME B31.3

ASME B31.3

Piping: Solid Inconel UNS N06625 (4” & below) Impact tested CS (-46 deg C) + UNS N06625 6mm Weld Overlay(6” & Above)

Piping: Low Temperature Carbon Steel Piping: Stainless Steel 316/316L

G11A

ASME B31.3

YES

NO

NO (See note 5)

NO

NO (See note 5)

YES

NO

E7E (NACE) E34A (NACE)

E37A (NACE)

F7E1 (NACE)

F25B (NACE)

F34A (NACE)

F37A (NACE)

G7E (NACE)

22

23

24

25

26

27

28

29

30

31

32

G37A (NACE)

ASME B31.3

Piping: Solid Inconel UNS N06625 (4” & below) Impact tested CS (-46 deg C) + UNS N06625 6mm Weld Overlay(6” & Above)

NO (See note 5)

YES

NO

NO

YES

NO

NO

NO

NO

YES

NO

NO

NO

YES

YES

NO

YES

YES

YES

YES

NO

YES

YES

100% VT 100% RT 100% VT 100% RT

100% VT 100% RT

100% VT 100% RT 100% VT 30% RT

100% VT 100% RT

100% VT 100% RT

100% VT 100% RT

100% VT 100% RT 100% VT 30% RT

100% VT 100% RT

NOTES:

1 Process design condition is in reference to Fluid List Doc No 560-20-PR-LIS-00001 (Rev. IFR). 2 Pipe Class with remarks “Not Applicable” are no longer in Fluid List (Doc. No 560-20-PR-LIS-00001) Rev. IFR. To be removed / maintained accordingly once the process design condition is finalised. 3 This table will have to be updated once the Piping Material Specification provides the latest update / final revision. 4 The exemption of PWHT for thickness above 25mm shall apply high preheat as per ASME B31.3. 5 Refer to TQ-COMP2-SPM-CE-TQY-00003 / TQ- COMP2-SPM-CE-TQY-00004. 6 Production hardness test shall be read in conjuction with Clause 10.1.3 “Hardness Testing of Production Weld of 200-20-CE-SPC-00014 “Material Corrosion Requirement in Sour Service System for CP6S and CP7S Complexes”. 7 PMI shall be read in conjuction with 200-20-CE-SPC-00020 “Specification for Positive Material Identification (PMI) for CP6S and CP7S Complexes”.

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