• API 6D :2015

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    SPECIFICATION FOR PIPELINE AND PIPING VALVES

    Available format(s):  Hardcopy, PDF

    Superseded date:  08-08-2019

    Language(s): 

    Published date:  01-01-2015

    Publisher:  American Petroleum Institute

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    Table of Contents - (Show below) - (Hide below)

    1 Scope
    2 Normative References
    3 Terms, Definitions, Acronyms, Abbreviations,
       Symbols, and Units
    4 Valve Types and Configurations
    5 Design
    6 Materials
    7 Welding
    8 Quality Control
    9 Pressure Testing
    10 Coating/Painting
    11 Marking
    12 Preparation for Shipment
    13 Documentation
    14 Facility Requirements
    Annex A (informative) - API Monogram Program Use of
            the API Monogram by Licensees
    Annex B (informative) - Valve Configurations
    Annex C (normative) - Valve End-to-end and Face-to-face
            Dimensions
    Annex D (normative) - Valve End-to-end and Face-to-face
            Dimensions
    Annex E (informative) - API 20 Series Supply Chain Management
    Annex F (normative) - Qualification of Heat-treating Equipment
    Annex G (normative) - Requirements for Nondestructive
            Examination
    Annex H (normative) - Supplementary Test Requirements
    Annex I (informative) - Requirements for Extended Hydrostatic
            Shell Test Duration and Records Retention
            for Valves in Jurisdictional Pipeline Systems
    Annex J (normative) - Quality Specification Level (QSL) for
            Pipeline Valves
    Annex K (informative) - Isolation Valve Features
    Annex L (normative) - External Coating for End Connections
    Annex M (informative) - Marking Example
    Annex N (informative) - Supplementary Documentation
            Requirements
    Annex O (informative) - Purchasing Guidelines
    Bibliography

    Abstract - (Show below) - (Hide below)

    Describes the requirements for the design, manufacturing, assembly, testing, and documentation of ball, check, gate, and plug valves for application in pipeline and piping systems for the petroleum and natural gas industries.

    General Product Information - (Show below) - (Hide below)

    Development Note Also available in Russian and Chinese editions, see API 6D RUSSIAN & API 6D CHINESE. (04/2016) Errata 9 2017 incorporates Errata 1 2014, Errata 2 2014, Errata 3 2015, Errata 4 2015, Errata 5 2015, Errata 6 2015, Errata 7 2016 and Errata 8 2016. (04/2017)
    Document Type Standard
    Publisher American Petroleum Institute
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    MSS SP 92 : 2012 MSS VALVE USER GUIDE
    API RP 1170 : 2015 DESIGN AND OPERATION OF SOLUTION-MINED SALT CAVERNS USED FOR NATURAL GAS STORAGE
    MIL V 13803 : E VALVE, GATE, DOUBLE DISC, CAST IRON OR STEEL
    MIL V 10386 : E SWING, CAST-IRON AND STEEL
    BS EN ISO 17078-4 : 2010 PETROLEUM AND NATURAL GAS INDUSTRIES - DRILLING AND PRODUCTION EQUIPMENT - PART 4: PRACTICES FOR SIDE-POCKET MANDRELS AND RELATED EQUIPMENT
    MIL HDBK 510-1 : A AEROSPACE FUELS CERTIFICATION
    16/30292328 DC : 0 BS ISO 27914 - CARBON DIOXIDE CAPTURE, TRANSPORTATION AND GEOLOGICAL STORAGE - GEOLOGICAL STORAGE
    API TR 1PER15K-1 : 2013 PROTOCOL FOR VERIFICATION AND VALIDATION OF HIGH-PRESSURE HIGH-TEMPERATURE EQUIPMENT
    17/30324750 DC : 0 BS ISO 20602 - SHIPS AND MARINE TECHNOLOGY - CHECK VALVES FOR USE IN LOW TEMPERATURE APPLICATIONS - DESIGN AND TESTING REQUIREMENTS
    API 607 REDLINE : 2010 FIRE TEST FOR QUARTER-TURN VALVES AND VALVES EQUIPPED WITH NONMETALLIC SEATS
    BS 3351(1971) : 1971 SPECIFICATION FOR PIPING SYSTEMS FOR PETROLEUM REFINERIES AND PETROCHEMICAL PLANTS
    API 1169 : 2013 RECOMMENDED PRACTICE FOR BASIC INSPECTION REQUIREMENTS - NEW PIPELINE CONSTRUCTION
    API 14E : 1991 : R2013 RECOMMENDED PRACTICE FOR DESIGN AND INSTALLATION OF OFFSHORE PRODUCTION PLATFORM PIPING SYSTEMS
    09/30172965 DC : 0 BS EN ISO 13628-15 - PETROLEUM AND NATURAL GAS INDUSTRIES - DESIGN AND OPERATION OF SUBSEA PRODUCTION SYSTEMS - PART 15: SUBSEA STRUCTURES AND MANIFOLDS
    BS 6755-2(1987) : 1987 TESTING OF VALVES - SPECIFICATION FOR FIRE TYPE-TESTING REQUIREMENTS
    16/30313948 DC : 0 BS ISO 18139 - SHIPS AND MARINE TECHNOLOGY - GLOBE VALVES FOR USE IN LOW TEMPERATURE APPLICATIONS - DESIGN AND TESTING REQUIREMENTS
    UNI EN ISO 13628-15 : 2011 PETROLEUM AND NATURAL GAS INDUSTRIES - DESIGN AND OPERATION OF SUBSEA PRODUCTION SYSTEMS - PART 15: SUBSEA STRUCTURES AND MANIFOLDS
    ASME B31.12 : 2014 HYDROGEN PIPING AND PIPELINES
    ASME B16.10 : 2017 FACE-TO-FACE AND END-TO-END DIMENSIONS OF VALVES
    API 6DR : 2012 RECOMMENDED PRACTICE FOR THE REPAIR AND REMANFACTURE OF PIPELINE VALVES
    BS ISO 12490:2011 (published 2011-09) Petroleum and natural gas industries. Mechanical integrity and sizing of actuators and mounting kits for pipeline valves
    BS 8010-2.8(1992) : 1992 CODE OF PRACTICE FOR PIPELINES - PIPELINES ON LAND: DESIGN, CONSTRUCTION AND INSTALLATION
    08/30180264 DC : DRAFT JUNE 2008 BS EN 13942 - PETROLEUM AND NATURAL GAS INDUSTRIES - PIPELINE TRANSPORTATION SYSTEMS - PIPELINE VALVES
    MSS SP 131 : 2017 METALLIC MANUALLY OPERATED GAS DISTRIBUTION VALVES
    API 14E CHINESE : 2007 RECOMMENDED PRACTICE FOR DESIGN AND INSTALLATION OF OFFSHORE PRODUCTION PLATFORM PIPING SYSTEMS
    API 1129 : 1996 ASSURANCE OF HAZARDOUS LIQUID PIPELINE SYSTEM INTEGRITY
    API RP 1133 : 2017 MANAGING HYDROTECHNICAL HAZARDS FOR PIPELINES LOCATED ONSHORE OR WITHIN COASTAL ZONE AREAS
    17/30334488 DC : 0 BS ISO 21157 - SHIPS AND MARINE TECHNOLOGY - BALL VALVES FOR USE IN LOW TEMPERATURE APPLICATIONS - DESIGN AND TESTING REQUIREMENTS
    BS ISO 27914:2017 Carbon dioxide capture, transportation and geological storage. Geological storage
    MSS SP 134 : 2012 VALVES FOR CRYOGENIC SERVICE, INCLUDING REQUIREMENTS FOR BODY/BONNET EXTENSIONS
    MIL HDBK 510 : A AEROSPACE FUELS CERTIFICATION
    API 607 : 2016 FIRE TEST FOR QUARTER-TURN VALVES AND VALVES EQUIPPED WITH NONMETALLIC SEATS
    BS EN ISO 13628-15:2011 (published 2011-09) Petroleum and natural gas industries. Design and operation of subsea production systems Subsea structures and manifolds
    MIL PRF 13803 : F VALVE, GATE - DOUBLE-DISK, CAST-IRON OR STEEL
    12/30262118 DC : 0 BS ISO 14313 - PETROLEUM AND NATURAL GAS INDUSTRIES - PIPELINE TRANSPORTATION SYSTEMS - PIPELINE VALVES
    BS 4515(1984) : 1984 SPECIFICATION FOR PROCESS OF WELDING OF STEEL PIPELINES ON LAND AND OFFSHORE
    10/30216306 DC : 0 BS ISO 12490 - PETROLEUM AND NATURAL GAS INDUSTRIES - ACTUATION MECHANICAL INTEGRITY AND SIZING FOR PIPELINE VALVES
    17/30324747 DC : 0 BS ISO 19037 - SHIPS AND MARINE TECHNOLOGY - GATE VALVES FOR USE IN LOW TEMPERATURE APPLICATIONS - DESIGN AND TESTING REQUIREMENTS
    EEMUA 205 : 2008 GUIDE TO THE PRODUCTION TESTING OF VALVES FOR THE ENERGY, PROCESS AND RELATED INDUSTRIES
    BS ISO 18139:2017 Ships and marine technology. Globe valves for use in low temperature applications. Design and testing requirements
    API 19G2 : 2010 FLOW-CONTROL DEVICES FOR SIDE-POCKET MANDRELS
    BS 8010-3(1993) : 1993 CODE OF PRACTICE FOR PIPELINES - PIPELINES SUBSEA: DESIGN, CONSTRUCTION AND INSTALLATION
    API STD 598 : 2016 VALVE INSPECTION AND TESTING
    BIS IS 15663-1 : 2006(R2011) DESIGN AND INSTALLATION OF NATURAL GAS PIPELINES - CODE OF PRACTICE - PART 1: LAYING OF PIPELINES
    API 1111 REDLINE : 2009 DESIGN, CONSTRUCTION, OPERATION, AND MAINTENANCE OF OFFSHORE HYDROCARBON PIPELINES (LIMIT STATE DESIGN)
    CSA Z341 SERIES-14 PACKAGE : 2014 CONSISTS OF Z341 SERIES-14, STORAGE OF HYDROCARBONS IN UNDERGROUND FORMATIONS AND Z341.4-14, SALT CAVERN WASTE DISPOSAL
    API 19G4 : 2011 PRACTICES FOR SIDE-POCKET MANDRELS AND RELATED EQUIPMENT
    PIP PNC00005 : 2016 DESIGN OF ASME B31.3 - METALLIC PIPING SYSTEMS
    CSA Z741 :2012 GEOLOGICAL STORAGE OF CARBON DIOXIDE
    CSA Z741 : 2012 : R2017 GEOLOGICAL STORAGE OF CARBON DIOXIDE
    API 17P : 2013 DESIGN AND OPERATION OF SUBSEA PRODUCTION SYSTEMS - SUBSEA STRUCTURES AND MANIFOLDS
    ASME PTB 12 : 2017 GUIDELINES FOR ADDRESSING DATA GAPS AND RECORDKEEPING FOR ASME B31.4, B31.8 AND B31.8S FOR PIPELINE INTEGRITY MANAGEMENT
    ASME B31.3:2016 PROCESS PIPING
    API 6G : 3ED 82 RECOMMENDED PRACTICE ON THROUGH FLOWLINE (TFL) PUMP DOWN SYSTEMS
    CSA Z662 PACKAGE : 2011 CONSISTS OF Z662-11, OIL AND GAS PIPELINE SYSTEMS AND Z662.1-11, COMMENTARY ON CSA Z662-11, OIL AND GAS PIPELINE SYSTEMS
    API 64 : 2017-08 DIVERTER EQUIPMENT SYSTEMS
    API RP 14C : 2017 ANALYSIS, DESIGN, INSTALLATION, AND TESTING OF SAFETY SYSTEMS FOR OFFSHORE PRODUCTION FACILITIES
    API 6DX : 2012 ACTUATOR SIZING AND MOUNTING KITS FOR PIPELINE VALVES
    API 17V : 2015 RECOMMENDED PRACTICE FOR ANALYSIS, DESIGN, INSTALLATION, AND TESTING OF SAFETY SYSTEMS FOR SUBSEA APPLICATIONS
    API 1111 : 2015 DESIGN, CONSTRUCTION, OPERATION, AND MAINTENANCE OF OFFSHORE HYDROCARBON PIPELINES (LIMIT STATE DESIGN)
    API 6F2 : 1999 TECHNICAL REPORT ON FIRE RESISTANCE IMPROVEMENTS FOR API FLANGES
    API 2RD : 2013 DYNAMIC RISERS FOR FLOATING PRODUCTION SYSTEMS
    API RP 14E : 1991 RECOMMENDED PRACTICE FOR DESIGN AND INSTALLATION OF OFFSHORE PRODUCTION PLATFORM PIPING SYSTEMS
    ISO 27914:2017 Carbon dioxide capture, transportation and geological storage Geological storage
    NBR 15280-1 : 2017 ONSHORE PIPELINE - PART 1: DESIGN
    I.S. 328:2015/AC1:2015 GAS TRANSMISSION PIPELINES AND PIPELINE INSTALLATIONS (EDITION 4)
    MSS SP 25 : 2013 STANDARD MARKING SYSTEM FOR VALVES, FITTINGS, FLANGES, AND UNIONS
    Z276-18 Liquefied natural gas (LNG) - Production, storage, and handling
    I.S. EN ISO 17078-4:2010 PETROLEUM AND NATURAL GAS INDUSTRIES - DRILLING AND PRODUCTION EQUIPMENT - PART 4: PRACTICES FOR SIDE-POCKET MANDRELS AND RELATED EQUIPMENT
    I.S. EN ISO 13628-15:2011 PETROLEUM AND NATURAL GAS INDUSTRIES - DESIGN AND OPERATION OF SUBSEA PRODUCTION SYSTEMS - PART 15: SUBSEA STRUCTURES AND MANIFOLDS (ISO 13628-15:2011)
    ASME B31.8 : 2016 Gas Transmission and Distribution Piping Systems
    ISO 18139:2017 Ships and marine technology Globe valves for use in low temperature applications Design and testing requirements
    CAN/CSA-Z662-15 Oil and gas pipeline systems
    CSA Z341 SERIES : 2014 STORAGE OF HYDROCARBONS IN UNDERGROUND FORMATIONS
    ISO 12490:2011 Petroleum and natural gas industries Mechanical integrity and sizing of actuators and mounting kits for pipeline valves
    NBR 16381 : 2015 ONSHORE AND OFFSHORE PIPELINES - SCRAPER-TRAP
    I.S. 328:2015 GAS TRANSMISSION PIPELINES AND PIPELINE INSTALLATIONS (EDITION 4)
    NBR 15827 : 2014 INDUSTRIAL VALVES FOR INSTALLATIONS OF EXPLORATION, PRODUCTION, REFINING AND TRANSPORT OF PETROL PRODUCTS - REQUIREMENTS FOR DESIGN AND PROTOTYPE TEST
    NFPA 59A : 2016 PRODUCTION, STORAGE, AND HANDLING OF LIQUEFIED NATURAL GAS (LNG)
    EN ISO 17078-2:2007/AC:2009 PETROLEUM AND NATURAL GAS INDUSTRIES - DRILLING AND PRODUCTION EQUIPMENT - PART 2: FLOW-CONTROL DEVICES FOR SIDE-POCKET MANDRELS
    EN ISO 13703:2000/AC:2007 PETROLEUM AND NATURAL GAS INDUSTRIES - DESIGN AND INSTALLATION OF PIPING SYSTEMS ON OFFSHORE PRODUCTION PLATFORMS
    EN 13942:2009/AC:2009 PETROLEUM AND NATURAL GAS INDUSTRIES - PIPELINE TRANSPORTATION SYSTEMS - PIPELINE VALVES
    ISO 17078-4:2010 Petroleum and natural gas industries Drilling and production equipment Part 4: Practices for side-pocket mandrels and related equipment
    BS EN ISO 17078-2 : 2007 PETROLEUM AND NATURAL GAS INDUSTRIES - DRILLING AND PRODUCTION EQUIPMENT - PART 2: FLOW-CONTROL DEVICES FOR SIDE-POCKET MANDRELS
    BS EN ISO 14224:2016 Petroleum, petrochemical and natural gas industries. Collection and exchange of reliability and maintenance data for equipment
    BS EN ISO 13703 : 2001 PETROLEUM AND NATURAL GAS INDUSTRIES - DESIGN AND INSTALLATION OF PIPING SYSTEMS ON OFFSHORE PRODUCTION PLATFORMS
    ISO 17078-2:2007 Petroleum and natural gas industries Drilling and production equipment Part 2: Flow-control devices for side-pocket mandrels
    ISO 13628-15:2011 Petroleum and natural gas industries Design and operation of subsea production systems Part 15: Subsea structures and manifolds
    BS EN 13942 : 2009 PETROLEUM AND NATURAL GAS INDUSTRIES - PIPELINE TRANSPORTATION SYSTEMS - PIPELINE VALVES
    ISO 14224:2016 Petroleum, petrochemical and natural gas industries Collection and exchange of reliability and maintenance data for equipment
    I.S. EN ISO 14224:2016 PETROLEUM, PETROCHEMICAL AND NATURAL GAS INDUSTRIES - COLLECTION AND EXCHANGE OF RELIABILITY AND MAINTENANCE DATA FOR EQUIPMENT (ISO 14224:2016)
    I.S. EN 13942:2009 PETROLEUM AND NATURAL GAS INDUSTRIES - PIPELINE TRANSPORTATION SYSTEMS - PIPELINE VALVES
    EN ISO 13628-15 : 2011 PETROLEUM AND NATURAL GAS INDUSTRIES - DESIGN AND OPERATION OF SUBSEA PRODUCTION SYSTEMS - PART 15: SUBSEA STRUCTURES AND MANIFOLDS (ISO 13628-15:2011)

    Standards Referencing This Book - (Show below) - (Hide below)

    ASME PV CODE 5 : 2017 BOILER AND PRESSURE VESSEL CODE - NONDESTRUCTIVE EXAMINATION
    API 607 : 2016 FIRE TEST FOR QUARTER-TURN VALVES AND VALVES EQUIPPED WITH NONMETALLIC SEATS
    ASNT SNT TC 1A : 2016 TOPICAL OUTLINES FOR QUALIFICATION OF NONDESTRUCTIVE TESTING PERSONNEL
    ASTM A 577/A577M : 2017 : REDLINE Standard Specification for Ultrasonic Angle-Beam Examination of Steel Plates
    API 20A : 2017 CARBON STEEL, ALLOY STEEL, STAINLESS STEEL, AND NICKEL BASE ALLOY CASTINGS FOR USE IN THE PETROLEUM AND NATURAL GAS INDUSTRY
    ISO 9712:2012 Non-destructive testing Qualification and certification of NDT personnel
    API 6DX : 2012 ACTUATOR SIZING AND MOUNTING KITS FOR PIPELINE VALVES
    ISO/TR 15608:2017 Welding Guidelines for a metallic materials grouping system
    ASME B16.34 : 2017 VALVES - FLANGED, THREADED, AND WELDING END
    ISO 6892-1:2016 Metallic materials Tensile testing Part 1: Method of test at room temperature
    API 6DSS : 2017-08 SPECIFICATION FOR SUBSEA PIPELINE VALVES
    ASME B16.10 : 2017 FACE-TO-FACE AND END-TO-END DIMENSIONS OF VALVES
    ISO 9606-1:2012 Qualification testing of welders Fusion welding Part 1: Steels
    EN 12516-1:2014 INDUSTRIAL VALVES - SHELL DESIGN STRENGTH - PART 1: TABULATION METHOD FOR STEEL VALVE SHELLS
    ASME PV CODE 9 : 2017 BOILER AND PRESSURE VESSEL CODE - WELDING, BRAZING, AND FUSING QUALIFICATIONS - QUALIFICATION STANDARD FOR WELDING, BRAZING, AND FUSING PROCEDURES; WELDERS; BRAZERS; AND WELDING, BRAZING, AND FUSING OPERATORS
    ASTM A 578/A578M : 2017 : REDLINE Standard Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications
    SAE AMS 2750 : 2012 PYROMETRY
    ISO 148-1:2016 Metallic materials Charpy pendulum impact test Part 1: Test method
    API SPEC 20E : 2017 ALLOY AND CARBON STEEL BOLTING FOR USE IN THE PETROLEUM AND NATURAL GAS INDUSTRIES
    ASME B16.25 : 2012 BUTTWELDING ENDS
    ISO 15614-1:2017 Specification and qualification of welding procedures for metallic materials Welding procedure test Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys
    MSS SP 25 : 2013 STANDARD MARKING SYSTEM FOR VALVES, FITTINGS, FLANGES, AND UNIONS
    ANSI/NACE MR 01 03/ISO 17495-1:2016 PETROLEUM, PETROCHEMICAL AND NATURAL GAS INDUSTRIES - METALLIC MATERIALS RESISTANT TO SULFIDE STRESS CRACKING IN CORROSIVE PETROLEUM REFINING ENVIRONMENTS
    API Q1 : 2013 SPECIFICATION FOR QUALITY MANAGEMENT SYSTEM REQUIREMENTS FOR MANUFACTURING ORGANIZATIONS FOR THE PETROLEUM AND NATURAL GAS INDUSTRY
    ASME PV CODE 8 DIV 1 : 2017 BOILER AND PRESSURE VESSEL CODE - RULES FOR CONSTRUCTION OF PRESSURE VESSELS DIVISION 1
    AWS QC1 : 2007 STANDARD FOR AWS CERTIFICATION OF WELDING INSPECTORS
    ASME PV CODE 2D CUSTOMARY : 2017 BOILER AND PRESSURE VESSEL CODE - MATERIALS - PROPERTIES (CUSTOMARY)
    ASME B31.4 : 2016 PIPELINE TRANSPORTATION SYSTEMS FOR LIQUIDS AND SLURRIES
    ISO 15614-7:2016 Specification and qualification of welding procedures for metallic materials Welding procedure test Part 7: Overlay welding
    ISO 10474:2013 Steel and steel products Inspection documents
    ASME B16.47 : 2017 LARGE DIAMETER STEEL FLANGES: NPS 26 THROUGH NPS 60 METRIC/INCH STANDARD
    EN 10204 : 2004 METALLIC PRODUCTS - TYPES OF INSPECTION DOCUMENTS
    ASME PV CODE 8 DIV 2 : 2017 BOILER AND PRESSURE VESSEL CODE - RULES FOR CONSTRUCTION OF PRESSURE VESSELS DIVISION 2- ALTERNATIVE RULES
    ASME B31.3:2016 PROCESS PIPING
    ASME B31.8 : 2016 Gas Transmission and Distribution Piping Systems
    ISO 80000-1:2009 Quantities and units Part 1: General
    ASME PV CODE 2D METRIC : 2017 BOILER AND PRESSURE VESSEL CODE - MATERIALS - PROPERTIES (METRIC)
    MSS SP 44 : 2016 STEEL PIPELINE FLANGES
    ISO 9001:2015 Quality management systems Requirements
    API 20B : 2013 OPEN DIE SHAPED FORGINGS FOR USE IN THE PETROLEUM AND NATURAL GAS INDUSTRY
    ASME B16.5 : 2017 PIPE FLANGES AND FLANGED FITTINGS: NPS 1/2 THROUGH NPS 24 METRIC/INCH STANDARD
    MSS SP 55 : 2011 QUALITY STANDARD FOR STEEL CASTINGS FOR VALVES, FLANGES, FITTINGS, AND OTHER PIPING COMPONENTS - VISUAL METHOD FOR EVALUATION OF SURFACE IRREGULARITIES
    ISO 10497:2010 Testing of valves Fire type-testing requirements
    ASTM E 8 : 2004 Standard Test Methods for Tension Testing of Metallic Materials
    EN 12516-2 : 2014 INDUSTRIAL VALVES - SHELL DESIGN STRENGTH - PART 2: CALCULATION METHOD FOR STEEL VALVE SHELLS
    SAE AMS H 6875 : 2010 HEAT TREATMENT OF STEEL RAW MATERIALS
    ASME B1.20.1 : 2013(R2018) PIPE THREADS, GENERAL PURPOSE (INCH)
    ISO 15607:2003 Specification and qualification of welding procedures for metallic materials General rules
    ISO 228-1:2000 Pipe threads where pressure-tight joints are not made on the threads Part 1: Dimensions, tolerances and designation
    ISO 5211:2017 Industrial valves Part-turn actuator attachments
    API 20C : 2015 CLOSED DIE FORGINGS FOR USE IN THE PETROLEUM AND NATURAL GAS INDUSTRY
    ISO 5208:2015 Industrial valves Pressure testing of metallic valves
    EN 287-1:2011 QUALIFICATION TEST OF WELDERS - FUSION WELDING - PART 1: STEELS
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