Supplementary Specification To API Recommended Practice 582 . - JIP33

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SPECIFICATION S-705 October 2019 Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries

Revision history VERSION DATE AMENDMENTS 0.1 October 2019 Issued for public review Acknowledgements This IOGP Specification was prepared by a Joint Industry Project 33 Standardization of Equipment Specifications for Procurement organized by IOGP with support by the World Economic Forum (WEF). Disclaimer Whilst every effort has been made to ensure the accuracy of the information contained in this publication, neither IOGP nor any of its Members past present or future warrants its accuracy or will, regardless of its or their negligence, assume liability for any foreseeable or unforeseeable use made thereof, which liability is hereby excluded. Consequently, such use is at the recipient's own risk on the basis that any use by the recipient constitutes agreement to the terms of this disclaimer. The recipient is obliged to inform any subsequent recipient of such terms. This publication is made available for information purposes and solely for the private use of the user. IOGP will not directly or indirectly endorse, approve or accredit the content of any course, event or otherwise where this publication will be reproduced. Copyright notice The contents of these pages are International Association of Oil & Gas Producers. Permission is given to reproduce this report in whole or in part provided (i) that the copyright of IOGP and (ii) the sources are acknowledged. All other rights are reserved. Any other use requires the prior written permission of IOGP. These Terms and Conditions shall be governed by and construed in accordance with the laws of England and Wales. Disputes arising here from shall be exclusively subject to the jurisdiction of the courts of England and Wales.

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries Foreword This specification was prepared under a Joint Industry Programme 33 (JIP33) "Standardization of Equipment Specifications for Procurement" organized by the International Oil & Gas Producers Association (IOGP) with the support from the World Economic Forum (WEF). Companies from the IOGP membership participated in developing this specification to leverage and improve industry level standardization for projects globally in the oil and gas sector. The work has developed a minimized set of supplementary requirements for procurement, with life cycle cost in mind, resulting in a common and jointly approved specification, building on recognized industry and/or international standards. Recent trends in oil and gas projects have demonstrated substantial budget and schedule overruns. The Oil and Gas Community within the World Economic Forum (WEF) has implemented a Capital Project Complexity (CPC) initiative which seeks to drive a structural reduction in upstream project costs with a focus on industrywide, non-competitive collaboration and standardization. The CPC vision is to standardize specifications for global procurement for equipment and packages, facilitating improved standardization of major projects across the globe. JIP33 provides the oil and gas sector with the opportunity to move from internally to externally focused standardisation initiatives and provide step change benefits in the sector's capital projects performance. This specification has been developed in consultation with a broad user and supplier base to realize benefits from standardization and achieve significant project and schedule cost reductions. The JIP33 work groups performed their activities in accordance with IOGP's Competition Law Guidelines (November 2014). Page 1 of 48 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries Table of Contents 1 Scope . 7 2 Normative References . 8 3 Terms and Definitions . 8 3.11 Acronyms, Abbreviations, and Symbols . 9 4 5 General Welding Requirements .10 4.6 Welding Procedure Specification (WPS) .10 4.7 Procedure Qualification Record (PQR) .10 Welding Processes .11 5.1 Acceptable Welding Processes.11 5.2 Limitations of Fusion Welding Processes .12 5.3 6 5.2.1 General . 12 5.2.2 GTAW . 12 5.2.3 GMAW-S . 12 5.2.4 GMAW-P . 13 5.2.5 FCAW . 13 5.2.6 EGW . 13 5.2.7 SAW . 13 Single-sided Welded Joints .13 Welding Consumables (Filler Metal and Flux) .14 6.1 General .14 6.1.11 Lot classification . 15 7 6.2 Dissimilar Welding .16 6.3 Low-alloy Steel Welding (P-No. 3 to P-No. 5 and P-No.15E) .16 6.4 Stainless Steel Welding (P-No. 6, P-No. 7, and P-No. 8) .17 6.5 Duplex and Super Duplex Stainless Steel Welding .17 6.6 SAW 6.8 Consumable Storage and Handling .20 6.9 Alloy Consumable Controls .20 Shielding and Purging Gases .20 7.8 8 .19 Verification of shielding and purging gas effectiveness .21 Preheating and Interpass Temperature.22 8.13 Welding interruption .24 9 Post-weld Heat Treatment (PWHT).25 9.11 Code exemptions .25 10 Cleaning and Surface Preparation .30 11 Special Procedure Qualification Requirements/Testing .31 11.1 General .31 Page 2 of 48 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries 11.2 Tube-to-tubesheet Welding .32 11.3 Additional Procedure Qualification Requirements for Duplex and Super Duplex Stainless Steels .33 11.3.1 General . 33 11.3.2 Thickness and Heat Input. 33 11.3.3 Welding Position . 34 11.3.4 Ferrite to Austenite Ratio. 34 11.3.6 Corrosion and Impact Testing . 34 11.3.7 Tube-to-tubesheet Joints. 35 11.4 Essential variables .35 11.5 PQR Hardness testing .37 11.6 Impact Testing .39 11.7 Macroscopic Examination .40 11.8 Corrosion Testing of 6Mo .40 11.9 Qualification of repair procedures .40 11.10 Qualification of buttering .40 12 Other Items .41 12.1 Backing Materials .41 12.2 Peening .41 12.3 Weld Overlay and Clad Restoration (Back Cladding) .41 12.6 Hardness Testing - Weld Procedure Qualification and Production Testing .41 12.7 Single-pass Welds .42 12.8 Additional Production Requirements for Welding Duplex and Super Duplex Stainless Steel .42 12.9 Permanent Attachments .42 12.10 Tack Welding.42 12.11 Repair Welding .43 12.12 Production Tests .44 12.13 Ferrite Control for Austenitic Stainless Steels.44 12.14 Proximity of Welds .44 Annex B (normative) Weld Overlay and Clad Restoration (Back Cladding) .45 B.1 General .45 B.2 Clad Restoration (Back Cladding) .46 B.3 Austenitic (300 Series) Stainless Steel Overlay.46 B.4 Ferritic Stainless Steel Alloys .46 B.6 Nickel-base Alloys (Other Than Ni-Cu Alloy 400) .46 Annex C (informative) Acceptance criteria for oxidation of stainless steel weldments .47 C.1 Page 3 of 48 Examples of acceptable and unacceptable oxidation of stainless steel weldments .47 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries Table of figures Figure C.1 - Acceptable - Very good result, no discoloration . 47 Figure C.2 - Acceptable - Slight discoloration, weld shiny, no scale present . 47 Figure C.3 - Acceptable - Slight discoloration, weld shiny, no scale present . 47 Figure C.4 - Unacceptable - Oxide layer present (grey colour) on and near weld; lack of proper back-purging. 48 Figure C.5 - Unacceptable - Oxide layer present (grey colour), weld burned; lack of proper backpurging . 48 Figure C.6 - Unacceptable - Very heavy oxide layer present . 48 Table of tables Table 7 - Acceptable welding processes . 11 Table 3 - Additional Chemical Requirements for Duplex and Super Duplex Stainless Steel Consumables and As-welded Deposits . 18 Table 8 - Maximum oxidation levels for titanium . 22 Table 9 - Maximum oxidation levels for stainless steel and nickel alloys . 22 Table 4 - Maximum Interpass Temperatures. 23 Table 5 - Maximum Interpass Temperatures for Duplex and Super Duplex Stainless Steels . 24 Table 6 - PWHT Temperatures and Holding Times . 26 Table 10 - Additional essential variables for procedure qualification per ASME BPVC Section IX . 35 Table 11 - Permitted maximum hardness values (HV10) for non-sour service. 38 Table 12 - Minimum Charpy V-notch absorbed energy values . 39 Table B.1 - Filler Material Selection for Overlay of Carbon and Low-alloy Steels. 45 Page 4 of 48 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries Introduction The purpose of this specification is to define a minimum common set of specification requirements for welding in accordance with API Recommended Practice 582, third edition, May 2016 for application in the petroleum and natural gas industries. This JIP33 standardized procurement specification follows a common document structure comprising the four documents as shown below, which together with the purchase order define the overall technical specification for procurement. JIP33 Specification for Procurement Documents Supplementary Technical Specification It is required to use all of these documents in conjunction with each other when applying this specification, as follows: S-705: Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries This specification is written as an overlay to API RP 582, following the clause structure of the parent standard, to assist in cross-referencing the requirements. Where clauses from the parent standard API RP 582 are not covered in this specification, there are no supplementary requirements or modifications to the respective clause. The terminology used within this specification follows that of the parent standard and otherwise is in accordance with ISO/IEC Directives, Part 2. Modifications to the parent standard defined in this specification are identified as Add (add to clause or add new clause), Replace (part of or entire clause) or Delete. S-705D: Datasheet for Welding Requirements This document provides project specific requirements where this specification requires the purchaser to define an application specific requirement. It also includes information required by the purchaser for technical evaluation. Additional purchaser supplied documents are also listed in the datasheet, to define scope and technical requirements for enquiry and purchase of the equipment. Page 5 of 48 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries S-705L: Information requirements for Welding This document defines the information requirements, including format, timing and purpose, for information to be provided by the vendor. It also defines the specific conditions which must be met for conditional information requirements to become mandatory. The information requirements listed in the IRS have references to the source of the requirement. S-705Q: Quality requirements for Welding This document includes a conformity assessment system (CAS) which specifies standardized user interventions against quality management activities at four different levels. The applicable CAS level is specified by the purchaser in the datasheet. The datasheet and IRS are published as editable documents for the purchaser to specify application specific requirements. The supplementary specification and QRS are fixed documents. Unless defined otherwise in the purchase order, the order of precedence (highest authority listed first) of the documents shall be: a) regulatory requirements; b) contract documentation (e.g. purchase order); c) purchaser defined requirements (datasheet, IRS, QRS); d) this specification; e) the parent standard. Page 6 of 48 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries 1 Scope 1.1 Replace with This specification provides requirements, supplementary guidelines and practices for welding and welding related topics for shop and field fabrication, repair and modification of the following: a) pressure-containing equipment such as pressure vessels, heat exchangers, piping (including package items and special piping items), heater tubes, and pressure boundaries of rotating equipment and attachments welded thereto; b) tanks (transportable) and attachments welded thereto; d) Simple load bearing applications using ASME IX, e.g. braces, that are welded directly to pressure containing equipment e) other equipment or component items when referenced by an applicable purchase document. 1.2 Replace with This document is general in nature and augments the welding requirements of ASME BPVC Section IX and similar codes, standards, specifications, and practices such as those listed in Section 2. The intent of this document is to be inclusive of chemical, oil and gas industry standards, although there are many areas not covered herein. The following is excluded from the scope of this specification: a) structural welding; b) pipelines; c) subsea production systems; d) field erected storage tanks (different base standards; API 620, API 650); e) marine related equipment e.g. ballasting pipework, systems covered by classification societies; f) wellheads, drilling and downhole equipment ; g) bulk material components covered by a manufacturer’s material certificate e.g. seam welded pipe and fittings, clad pipe; h) heating, cooling and air conditioning; i) non-metallic material welding; j) other fabrication methods e.g. bending and forming, brazing and mechanical connections; h) pressure classes above 2500. NOTE The scope of application is focused on the upstream segment and as a consequence the use of the specification in downstream applications will be limited. Page 7 of 48 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries 1.3 Delete clause 2 Normative References ASME BPVC Section II, Part D Properties - Materials ASTM A262 Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels ASTM E384 Standard Test Method for Microindentation Hardness of Materials EN 1011 Welding - Recommendations for welding of metallic materials EN 10204 Metallic products - Types of inspection documents ISO 6507 Metallic materials - Vickers hardness test ISO 9001:2015 Quality management systems - Requirements ISO 10474 Steel and steel products - Inspection documents - Second Edition ISO 14175 Welding consumables — Gases and gas mixtures for fusion welding and allied processes - Second Edition ISO 14344 Welding consumables — Procurement of filler materials and fluxes Second Edition ISO 15609 Specification and qualification of welding procedures for metallic materials — Welding procedure specification ISO 15614 Specification and qualification of welding procedures for metallic materials — Welding procedure test ISO/TR 17671 Welding — Recommendations for welding of metallic materials ISO 17781 Petroleum, petrochemical and natural gas industries - Test methods for quality control of microstructure of ferritic/austenitic (duplex) stainless steels - First Edition 3 Terms and Definitions Add new definition 3.9 CE Carbon Equivalent CE (IIW) Page 8 of 48 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries Add new definition 3.10 PREN Pitting Resistance Equivalent Number PREN Add new section 3.11 Acronyms, Abbreviations, and Symbols ASS Austenitic Stainless Steel CS Carbon Steel DHT Dehydrogenation heat treatment DSS Duplex Stainless Steel EBW Electron beam welding ECA Engineering Critical Assessment ESW Electroslag welding FCAW-G Gas shielded flux-cored arc welding FN Ferrite number GMAW Gas metal arc welding GMAW-P Pulsed gas metal arc welding GMAW-S Short circuiting gas metal arc welding GMAW-Sp Spray gas metal arc welding GTAW Gas tungsten arc welding GTAW-P Pulsed gas tungsten arc welding HAZ Heat affected zone LAS Low Alloy Steel LBW Laser beam welding LTCS Low Temperature Carbon Steel MDT Minimum design temperature Mf Martensite finish temperature MT Magnetic particle testing NDE Non-destructive testing PAW Plasma arc welding PWHT Post weld heat treatment PT Penetrant testing SAW Submerged arc welding SMAW Shielded metal arc welding Page 9 of 48 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries 4 General Welding Requirements 4.1 Delete clause 4.2 Delete clause 4.5 Replace with Any pressure boundary welds and welds to the pressure boundary shall comply with the specified design code and related welding code. Add new sub section 4.6 Welding Procedure Specification (WPS) 4.6.1 Welding procedure specifications (WPSs) shall be prepared in accordance with ASME BPVC Section IX or the applicable parts of ISO 15609 and the applicable code. 4.6.2 The WPS shall include all additional essential variables stated in Table 10 of this specification. Add new sub section 4.7 Procedure Qualification Record (PQR) 4.7.1 Welding procedures shall be qualified in accordance with the applicable code and ASME BPVC Section IX or the applicable parts of ISO 15614. 4.7.2 The PQR shall be endorsed by a recognised independent third party. NOTE This clause has been added for worldwide acceptance as it is a legal requirement in several regions, but can be waived in other regions with purchaser approval. Add new clause 4.8 All pressure retaining welds shall be full penetration. Page 10 of 48 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries Add new clause 4.9 All pressure retaining welds shall be, where practical, double sided. Add new clause 4.10 Vertical down welding shall not be used. Add new clause 4.11 The weld and the area around it to a distance of at least 3.3 ft (1 m) shall be protected from inclement weather. Add new clause 4.12 The wind speed shall not exceed 0.5 mph (0.2 m/s) in the area where gas shielded welding (GTAW, FCAWG, GMAW, PAW) is taking place. 5 5.1 Welding Processes Acceptable Welding Processes Replace with Acceptable welding processes are given in Table 7. Add new table Table 7 - Acceptable welding processes Welding processes Root pass1 Shielded metal arc welding (SMAW) Gas tungsten arc welding (GTAW/GTAW-P) x Gas metal arc welding - spray (GMAW-Sp) Gas metal arc welding - short circuiting (GMAW-S) x2 Gas metal arc welding - pulsed (GMAW-P) 2nd pass Fill/cap x x x x x x x x x x x x x2 x3 x x x x x Submerged arc welding (SAW) Electroslag welding (ESW) x Gas shielded flux-cored arc welding (FCAW-G) Plasma arc welding (PAW) x Laser beam welding (LBW) Page 11 of 48 Cladding Buttering4 S-705 x x x x x x x x x x x x October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries Welding processes Root pass1 2nd pass Fill/cap x x x Electron beam welding (EBW) Cladding Buttering4 NOTE 1 Single sided weld where the root pass is not removed. NOTE 2 Refer to 5.2.3 b) NOTE 3 Refer to 5.2.3 c) NOTE 4 Some of the processes below are typically only used on reinstatements. 5.2 5.2.1 Limitations of Fusion Welding Processes General Replace with Autogenous welding shall not be used except for EBW. Replace sub section heading with 5.2.2 GTAW Add new clause 5.2.2.1 The restriction in 5.2.2 shall also apply to the remainder of the weld. Add new clause 5.2.2.2 All GTAW machines shall be equipped with arc starting devices (e.g. high frequency starting unit), craterelimination, slope-in and slope-out control, and pre-gas and post-gas flow. 5.2.3 GMAW-S Replace list item b) with GMAW-S shall only be used with interrupted arc transfer mode (e.g. STT, RMD). Delete list item d) Delete list item e) Add item f) to list f) GMAW-S shall only be used for pipe sizes NPS 3 and over. Page 12 of 48 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries 5.2.4 GMAW-P Delete first sentence 5.2.5 FCAW 5.2.5.1 Replace with FCAW-S shall not be used. 5.2.5.2 Replace with FCAW-G shall only be used as allowed by Table 7. 5.2.5.4 Add to clause after "ASME/AWS" or ISO 5.2.5.5 Delete clause Delete Table 1 5.2.6 EGW Delete clause 5.2.7 SAW 5.2.7.2 Delete "unless approved by the purchaser" Add new clause 5.2.7.4 Run-on and run-off plate shall have the same P-No. as the base material. 5.3 Single-sided Welded Joints Replace with For single sided welded joints, any slag on the process side of root passes shall be removed completely. Page 13 of 48 S-705 October 2019

Supplementary Specification to API Recommended Practice 582 Welding Guidelines for the Chemical, Oil, and Gas Industries 6 Welding Consumables (Filler Metal and Flux) 6.1 General 6.1.1 Add to clause after "Part C/AWS" or ISO Add after first sentence When the brand name is an essential variable, the brand name shall be specifie

This specification is written as an overlay to API RP 582, following the clause structure of the parent standard, to assist in cross-referencing the requirements. Where clauses from the parent standard API RP 582 are not covered in this specification, there are no supplementary requirements or modifications to the respective clause.

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