Petroleum Development Oman L.L.C.

UNRESTRICTED Document ID : SP-1173

Dec 2004 Filing key : xxxx

Specification for Welding

of On-Plot Pipe work

(Amendments/Supplements to ASME B31.3)

Keywords:

ASME B31.3

Inspection

On-plot

Piping

Procedure Qualification Record

Production Welding

Testing

Welding Procedure Specification

Welder Qualification

This document is the property of Petroleum Development Oman, LLC. Neither the whole nor any part of

this document may be disclosed to others or reproduced, stored in a retrieval system, or transmitted in

any form by any means (electronic, mechanical, reprographic recording or otherwise) without prior

written consent of the owner.

Specification for Welding of On-Plot Pipework Version 1.2

Authorised For Issue

Signed :...........................................................

UER (TTO/1)

CFDH Materials and Corrosion

The following table lists the four most recent revisions to this document. Details of all revisions prior to

these are held on file by the issuing department.

Version No. Date Author Scope / Remarks

Version 1.0 O5/04/00 OTT/15 Revision and re-formatting of original issue of

ERD 43-01.

Version 1.1 04/06/00 OTT/15 Appendix D added, minor textual corrections.

Version 1.2 25/12/04 TTO/15 Updated based on past experience

December 2004 SP-1173 i

Version 1.2 Specification for Welding of On-Plot Pipe work

Contents

1. Introduction ......................................................................................................................... 1 1.1 Purpose............................................................................................................................. 1 1.2 Changes to the Specification............................................................................................ 1 1.3 Effective Period................................................................................................................ 1 1.4 Review and Improvement ................................................................................................ 1 1.5 Process Owner's Responsibility ....................................................................................... 1

2. Specification for On-Plot Welding ..................................................................................... 2 2.1 Specification Requirements ............................................................................................. 2 2.2 Process Deliverables ........................................................................................................ 2 2.3 Performance Levels / Indicators....................................................................................... 2 2.4 Performance Monitoring .................................................................................................. 2

Appendix A Glossary of Definitions, Terms and Abbreviations.......................................... 3

Appendix B Amendments/Supplements to ASME B31.3...................................................... 6 Contents of Appendix B:

Chapter V Fabrication, Assembly and Erection ................................................................... 6 328 Welding ........................................................................................................................... 6

328.2 Welding Qualifications ......................................................................................... 6 328.2.1 Qualification requirements.............................................................................. 6 328.2.2 Procedure qualification by others.................................................................. 14 328.2.3 Performance qualification by others ............................................................. 14 328.2.4 Qualification records..................................................................................... 14

328.3 Welding Materials............................................................................................... 14 328.3.1 Filler Metal.................................................................................................... 14 328.3.2 Weld backing material .................................................................................. 17 328.3.3 Consumable inserts ....................................................................................... 17

328.4 Preparation For Welding..................................................................................... 17 328.4.1 Cleaning ........................................................................................................ 17 328.4.2 End preparation ............................................................................................. 17 328.4.3 Alignment...................................................................................................... 18

328.5 Welding Requirements ....................................................................................... 19 328.5.1 General .......................................................................................................... 19 328.5.2 Fillet and socket welds .................................................................................. 22 328.5.4 Welded branch connections .......................................................................... 22

328.6 Weld Repair ........................................................................................................ 22 330 Preheating..................................................................................................................... 23

330.1 General................................................................................................................ 23 330.1.1 Requirements and recommendations............................................................. 23 330.1.4 Preheat zone .................................................................................................. 23

330.2 Specific Requirements ........................................................................................ 23 330.2.4 Interrupted Welding ...................................................................................... 23

331 Heat Treatment ............................................................................................................ 23 331.1.1 Heat Treatment Requirements....................................................................... 23 331.1.4 Heating and cooling. ..................................................................................... 24 331.1.6 Temperature Verification .............................................................................. 24 331.2.2 Exceptions to Basic Requirements ................................................................ 24 331.2.6 Local Heat Treatment.................................................................................... 24

336 Handling and Storage .................................................................................................. 25 336.1 General................................................................................................................ 25 336.2 Storage ................................................................................................................ 25 336.3 Pipe Handling ..................................................................................................... 25

Chapter VI Inspection, Examination and Testing............................................................... 26 340 Inspection...................................................................................................................... 26

340.4 Qualifications of The Owner’s Inspector............................................................ 26

SP-1173 December 2004 ii

Specification for Welding of On-Plot Pipework Version 1.2

341 Examination.................................................................................................................. 26 341.2 Responsibility for Examination .......................................................................... 26 341.3 Examination Requirements ................................................................................. 26

341.3.2 Acceptance Criteria ....................................................................................... 26 341.4 Extent of Required Examination......................................................................... 26

341.4.1 Examination Normally Required................................................................... 26 342 Examination Personnel............................................................................................. 27 342.1 Personnel Qualification and Certification........................................................... 27

343 Examination Procedures ............................................................................................. 27 344 Types of Examination .................................................................................................. 28

344.1 General................................................................................................................ 28 344.2 Visual Examination............................................................................................. 28 344.3 Magnetic Particle Examination........................................................................... 28 344.4 Liquid Penetrant Examination ............................................................................ 28 344.5 Radiographic Examination.................................................................................. 28

344.5.1 Method .......................................................................................................... 28 344.6 Ultrasonic Examination ...................................................................................... 29

344.6.1 Method .......................................................................................................... 29 345 Testing........................................................................................................................... 29

345.1 Required Leak Test............................................................................................. 29 346 Records.......................................................................................................................... 29

346.1 Documentation.................................................................................................... 29 347 Certificate of Conformity ............................................................................................ 30 Table 1 Extent of Non-Destructive Testing for Welds ........................................................ 31 Figure 1 Hardness Indent Locations .............................................................................. 33 Figure 2 Orientation and Location of Charpy Impact Specimens .............................. 34

Appendix C References.......................................................................................................... 35

Appendix D WPS and PQR Forms....................................................................................... 36

User Comment Form .............................................................................................................. 43

December 2004 SP-1173 iii

Specification for Welding of On-Plot Pipework Version 1.2

1. Introduction

1.1 Purpose

This specification is a revision of SP-1173 version 1.1, Specification for Welding On-Plot Pipe

work, issued in June 2000. The purpose of this document is to define the minimum technical

requirements for the fabrication, welding, inspection and non-destructive testing of carbon, low

alloy and austenitic stainless steels for on-plot pipe work. This specification shall be used where

the applicable code has been designated by the Company as ASME B31.3, Process Piping. SP-

1173 version 1.2 is based on ASME B31.3-2002.

1.2 Changes to the Specification

This Specification shall not be changed without approval from the Custodian, CFDH

Materials and Corrosion), who owns this Specification. If you think any part of this

specification is not correct, write your comments on a copy of the User Comments Form. The

form is included as the last page of this Specification. Send the copy with your comments and

personal details to DCS.

1.3 Effective Period

The requirements of this specification shall remain in force indefinitely unless superseded by

an authorised revision.

1.4 Review and Improvement

This specification will be reviewed and updated once every three years. The review authority

will be CFDH Materials and Corrosion.

1.5 Process Owner's Responsibility

The owner of this specification is the CFDH of Materials and Corrosion, is responsible for

authorising all proposed deviations or amendments to the specification and for the instigation

of periodic reviews and updates in accordance with Clauses 1.2 and 1.4

December 2004 Page 1 SP-1173

Version 1.2 Specification for Welding of On-Plot Pipework

2. Specification for On-Plot Welding

This specification gives the minimum requirements for the welding, fabrication and inspection

of carbon steel, low alloy steel and austenitic stainless steel on-plot pipe work. The

specification is restricted to applications for which the applicable Code for pressure piping is

designated by the Company as ASME B31.3, Process Piping.

This document is not applicable to the welding of duplex/super-duplex stainless steel and high

alloyed austenitic stainless steels such as UNS S31254, Nickel alloy, Class 1 pipelines,* Class

2 and 3 pipelines,* pressure vessels, storage tanks, or structural steelwork. It is also not

applicable to the welding of materials other than those listed above except as specifically

agreed with the Company CFDH Materials and Corrosion.

* Pipeline classes are defined in SP 1211 (November 2004), Pipeline Engineering.

2.1 Specification Requirements

Welding, fabrication and inspection shall be in accordance with the requirements of ASME

B31.3 (latest version), as amended and supplemented by Appendix B of this specification.

The Clause numbering in Appendix B follows that of ASME B31.3 (2002). Where clauses of

ASME B31.3 are not amended or supplemented by Appendix B, they shall apply in their

entirety.

2.2 Process Deliverables

Process deliverables comprise shop or field welded carbon, low alloy or austenitic stainless

steel pipe work and related welded fabrications designed to ASME B31.3 and normally

intended for on-plot oil, gas or water service.

2.3 Performance Levels / Indicators

See relevant ASME B31.3 weld inspection and testing acceptance criteria and the amendments

given in Appendix B of this specification.

2.4 Performance Monitoring

Requirements for monitoring welding process variables, welder performance and weld quality

are detailed in relevant sections of ASME B31.3/ASME IX and the amendments given in

Appendix B of this specification.

December 2004 Page 2 SP-1173

Specification for Welding of On-Plot Pipework Version 1.2

Appendix A Glossary of Definitions, Terms and Abbreviations

Certain terms and abbreviations used in this document are defined below. The listed

definitions shall be considered to supplement those given in ASME B31.3.

General Definitions

Contractor

The party which carries out all or part of the design, engineering,

procurement, construction, commissioning or management of a project, or

operation or maintenance of a facility. The Company may undertake all or

part of the duties of the Contractor.

Manufacturer/

Supplier

The party, which manufactures or supplies equipment and services to perform

the duties specified by the Contractor for the Company.

Company Petroleum Development Oman LLC. The Company will generally specify the

technical requirements. The Company may also include an agent or consultant

authorised to act for, and on behalf of, the Company.

User The Company, Consultant or Contractor who uses this document.

Corporate Functional

Discipline Head

The person within the Company responsible for the discipline to which this

specification belongs.

shall Any deviation to the requirement shall be approved by the CFDH.

should Any deviation to the recommendation shall be approved by Company

Welding TA-2.

may Indicates a possible course of action.

Specific Definitions

Batch or Lot As defined in AWS A5.01, Clause 5 (Classification) and Clause 6 (Testing)

Nominal Thickness Nominal thickness T shall have the following meanings:

- butt joint; parent metal thickness, which for joints between dissimilar

thicknesses is that of the thinner material.

- fillet weld; parent metal thickness, which for joints between dissimilar

thicknesses is that of the thicker material.

- set-on branch connection; thickness of branch pipe

- set-through branch connection; thickness of main pipe.

Owner Term used in ASME B31.3 that shall be understood to mean the Company.

Verified copy A photocopy of an original document, which has been re-endorsed and signed

by the organisation producing the photocopy to verify that none of the

information has been adulterated.

Welding Co-ordinator The Contractor nominated authority on the quality aspects of welding. The

Welding co-ordinator shall be a Welding Engineer meeting the

recommendations for European Welding Engineer (refer ISO 14731).

However, other national/international qualifications may be considered at the

discretion of the Company. The Welding Co-ordinator shall be approved by

the Company TA-2 (Welding).

December 2004 Page 3 SP-1173

Version 1.2 Specification for Welding of On-Plot Pipework

Examples of Piping Steels

Non-impact tested

carbon steel, (CS)

ASTM A 106 B, A 105, A234-WPB

Impact tested carbon

steel, (LTCS)

ASTM A 333 Gr. 6, A350 LF2, A420 WPL 6

3 ½ % Nickel Steels

ASTM A350 LF3, A420 WPL3

Abbreviations

ASNT American Society for Non-destructive Testing

ASME American Society of Mechanical Engineers

ASTM American Society for Testing and Materials

AWS American Welding Society

CFDH Corporate Functional Discipline Head

CS Carbon Steel

CSWIP Certification Scheme for Welding Inspection Personnel

D Nominal Outside Diameter

DCS Document Control Section

EMR Extra Moisture Resistant

FN Ferrite Number

GTAW Gas Tungsten Arc Welding

HAZ Heat Affected Zone

HV Vickers Hardness

ITCS Impact Tested Carbon Steel

MDMT Minimum Design Metal Temperature

MT Magnetic Particle Testing

NACE National Association of Corrosion Engineers

NDT Non-Destructive Testing

PAMS Portable Arc Monitoring System

PCN Personnel Certification in NDT

PQR Procedure Qualification Record

PT Liquid Penetrant Testing

December 2004 Page 4 SP-1173