I.S. EN 15001-1:2009
Superseded
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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GAS INFRASTRUCTURE - GAS INSTALLATION PIPEWORK WITH AN OPERATING PRESSURE GREATER THAN 0,5 BAR FOR INDUSTRIAL INSTALLATIONS AND GREATER THAN 5 BAR FOR INDUSTRIAL AND NON-INDUSTRIAL INSTALLATIONS - PART 1: DETAILED FUNCTIONAL REQUIREMENTS FOR DESIGN, MATERIALS, CONSTRUCTION, INSPECTION AND TESTING
Available format(s)
Hardcopy , PDF
Superseded date
02-03-2023
Superseded by
Language(s)
English
Published date
01-01-2009
Publisher
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
Only cited Standards give presumption of conformance to New Approach Directives/Regulations.
Dates of withdrawal of national standards are available from NSAI.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Materials
6 Design of pipework
7 Design of pressure control systems
8 Construction
9 Documentation, inspection and testing
Annex A (informative) Example schematic diagrams of
installation options for gas pressure regulating
systems
Annex B (informative) Examples of methods for testing
Annex C (informative) Flammable gases mixing systems
Annex D (informative) Examples of supports
Annex E (normative) Materials
Annex ZA (informative) Relationship between this European
Standard and the Essential Requirements of EU
Directive 97/23/EC
Bibliography
Defines detailed functional requirements for the design, selection of materials, construction, inspection and testing of: - industrial gas installation pipework and assemblies with an operating pressure greater than 0,5 bar, and - non-industrial gas installation pipework (residential and commercial) with an operating pressure greater than 5 bar in buildings.
| DocumentType |
Standard
|
| Pages |
122
|
| PublisherName |
National Standards Authority of Ireland
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| Status |
Superseded
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| SupersededBy |
| Standards | Relationship |
| EN 15001-1:2009 | Identical |
| I.S. 820:2010 | NON-DOMESTIC GAS INSTALLATIONS |
| I.S. 3216:2010 | CODE OF PRACTICE - BULK STORAGE OF LIQUEFIED PETROLEUM GAS (LPG) - (EDITION 2) |
| EN 12732:2013+A1:2014 | Gas infrastructure - Welding steel pipework - Functional requirements |
| EN 10208-2:2009 | Steel pipes for pipelines for combustible fluids - Technical delivery conditions - Part 2: Pipes of requirement class B |
| EN 13480-6:2017 | Metallic industrial piping - Part 6: Additional requirements for buried piping |
| EN 10240:1997 | Internal and/or external protective coatings for steel tubes - Specification for hot dip galvanized coatings applied in automatic plants |
| EN 10002-1 : 2001 | METALLIC MATERIALS - TENSILE TESTING - PART 1: METHOD OF TEST AT AMBIENT TEMPERATURE |
| EN 12327:2012 | Gas infrastructure - Pressure testing, commissioning and decommissioning procedures - Functional requirements |
| ISO 898-2:2012 | Mechanical properties of fasteners made of carbon steel and alloy steel — Part 2: Nuts with specified property classes — Coarse thread and fine pitch thread |
| IEC 60079-10:2002 | Electrical apparatus for explosive gas atmospheres - Part 10: Classification of hazardous areas |
| PD 970:2001 | Wrought steels for mechanical and allied engineering purposes. Requirements for carbon, carbon manganese and alloy hot worked or cold finished steels |
| EN 1514-1:1997 | Flanges and their joints - Dimensions of gaskets for PN-designated flanges - Part 1: Non-metallic flat gaskets with or without inserts |
| EN 13480-2:2017 | Metallic industrial piping - Part 2: Materials |
| EN 1555-1:2010 | Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 1: General |
| EN ISO 5817:2014 | Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections (ISO 5817:2014) |
| EN 13100-1:2017 | Non destructive testing of welded joints of thermoplastics semi-finished products - Part 1: Visual examination |
| EN 1555-3:2010+A1:2012 | Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 3: Fittings |
| EN 1515-1:1999 | Flanges and their joints - Bolting - Part 1: Selection of bolting |
| ISO 15348:2002 | Pipework Metal bellows expansion joints General |
| EN 10290:2002 | Steel tubes and fittings for onshore and offshore pipelines - External liquid applied polyurethane and polyurethane-modified coatings |
| EN 12007-3:2015 | Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 3: Specific functional requirements for steel |
| EN 12560-1:2001 | Flanges and their joints - Gaskets for Class-designated flanges - Part 1: Non-metallic flat gaskets with or without inserts |
| ISO 3506-1:2009 | Mechanical properties of corrosion-resistant stainless steel fasteners Part 1: Bolts, screws and studs |
| EN 1775:2007 | Gas supply - Gas pipework for buildings - Maximum operating pressure less than or equal to 5 bar - Functional recommendations |
| DIN 267-4:1983-08 | FASTENERS - TECHNICAL DELIVERY CONDITIONS - PROPERTY CLASSES FOR NUTS (PREVIOUS CLASSES) |
| NFE 25 005 : 2005 | FASTENERS - TEST METHODS |
| EN 10216-5:2013 | Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 5: Stainless steel tubes |
| EN 13445-6 : 2014 COR 2017 | UNFIRED PRESSURE VESSELS - PART 6: REQUIREMENTS FOR THE DESIGN AND FABRICATION OF PRESSURE VESSELS AND PRESSURE PARTS CONSTRUCTED FROM SPHEROIDAL GRAPHITE CAST IRON |
| NFE 25 400 : 1985 | |
| EN 12560-2:2013 | Flanges and their joints - Dimensions of gaskets for Class-designated flanges - Part 2: Spiral wound gaskets for use with steel flanges |
| EN 13480-4:2017 | Metallic industrial piping - Part 4: Fabrication and installation |
| EN 1254-5:1998 | Copper and copper alloys - Plumbing fittings - Part 5: Fittings with short ends for capillary brazing to copper tubes |
| EN ISO 3506-1:2009 | Mechanical properties of corrosion-resistant stainless steel fasteners - Part 1: Bolts, screws and studs (ISO 3506-1:2009) |
| EN 1057:2006+A1:2010 | Copper and copper alloys - Seamless, round copper tubes for water and gas in sanitary and heating applications |
| EN ISO 15612:2004 | Specification and qualification of welding procedures for metallic materials - Qualification by adoption of a standard welding procedure (ISO 15612:2004) |
| ISO 15610:2003 | Specification and qualification of welding procedures for metallic materials — Qualification based on tested welding consumables |
| EN 1759-1:2004 | Flanges and their joint - Circular flanges for pipes, valves, fittings and accessories, Class designated - Part 1: Steel flanges, NPS 1/2 to 24 |
| NFA 49 145 : 1978 | STEEL TUBES - HOT FINISHED WELDED TUBES SUITABLE FOR THREADING - DIMENSIONS - TECHNICAL DELIVERY CONDITIONS |
| ASTM F 593 : 2017 : REDLINE | Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs |
| EN 1254-1:1998 | Copper and copper alloys - Plumbing fittings - Part 1: Fittings with ends for capillary soldering or capillary brazing to copper tubes |
| EN 1254-2:1998 | Copper and copper alloys - Plumbing fittings - Part 2: Fittings with compression ends for use with copper tubes |
| VDI 3733:1996-07 | Noise at pipes |
| BS 6104-1:1981 | Mechanical properties of fasteners Specification for bolts, screws and studs |
| EN 10289:2002 | Steel tubes and fittings for onshore and offshore pipelines - External liquid applied epoxy and epoxy-modified coatings |
| SAE J 429 : 2014 | MECHANICAL AND MATERIAL REQUIREMENTS FOR EXTERNALLY THREADED FASTENERS |
| EN 10088-3:2014 | Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes |
| EN 1594:2013 | Gas infrastructure - Pipelines for maximum operating pressure over 16 bar - Functional requirements |
| BS 6104-2:1983 | Mechanical properties of fasteners Specification for nuts with specified proof load values |
| NFT 54 065 : 1987 | PLASTIQUES - TUBES EN POLYETHYLENE POUR RESEAUX DE DISTRIBUTION DE COMBUSTIBLES GAZEUX - SPECIFICATIONS ET METHODES D'ESSAIS |
| ASME B16.11 : 2016 | FORGED FITTINGS, SOCKET-WELDING AND THREADED |
| NEN 2078 : 2001 | REQUIREMENTS FOR INDUSTRIAL GAS INSTALLATIONS |
| EN 10087:1998 | Free-cutting steels - Technical delivery conditions for semi-finished products, hot-rolled bars and rods |
| DIN 3547-1:1990-06 | PN 4 TO PN 16 GAS AND WATER STOPVALVES; REQUIREMENTS AND ACCEPTANCE TESTING |
| EN 751-2:1996 | Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 2: Non-hardening jointing compounds |
| DIN 8075:2011-12 | POLYETHYLENE (PE) PIPES - PE 80, PE 100 - GENERAL QUALITY REQUIREMENTS, TESTING |
| EN 12954:2001 | Cathodic protection of buried or immersed metallic structures - General principles and application for pipelines |
| EN 13480-1:2017 | Metallic industrial piping - Part 1: General |
| NFE 25 100 : 1985 | |
| NF EN 1594 : 2014 | GAS INFRASTRUCTURE - PIPELINES FOR MAXIMUM OPERATING PRESSURE OVER 16 BAR - FUNCTIONAL REQUIREMENTS |
| EN 764-5:2014 | Pressure equipment - Part 5: Inspection documentation of metallic materials and compliance with the material specification |
| EN 20898-2 : 1993 | MECHANICAL PROPERTIES OF FASTENERS - PART 2: NUTS WITH SPECIFIED PROOF LOAD VALUES - COARSE THREAD (ISO 898-2:1992) |
| MSS SP 97 : 2012 | INTEGRALLY REINFORCED FORGED BRANCH OUTLET FITTINGS - SOCKET WELDING, THREADED, AND BUTTWELDING ENDS |
| IEC 60364-1:2005 | Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, definitions |
| DVGW VP 308 : 2004 | GAS-ABSPERRARMATUREN FUER MANOMETER (EINSCHLIESSLICH UEBERDRUCKSCHUTZVORRICHTUNGEN) UND STEUERLEITUNGEN |
| EN 12449:2016 | Copper and copper alloys - Seamless, round tubes for general purposes |
| EN 1044 : 1999 | BRAZING - FILLER METALS |
| EN 10045-1 : 1990 | METALLIC MATERIALS - CHARPY IMPACT TEST - PART 1: TEST METHOD |
| ISO 15612:2004 | Specification and qualification of welding procedures for metallic materials Qualification by adoption of a standard welding procedure |
| DIN 17458:1985-07 | SEAMLESS CIRCULAR AUSTENITIC STAINLESS STEEL TUBES SUBJECT TO SPECIAL REQUIREMENTS - TECHNICAL DELIVERY CONDITIONS |
| ISO 5817:2014 | Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) — Quality levels for imperfections |
| EN ISO 228-1:2003 | Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation (ISO 228-1:2000) |
| EN 12266-1:2012 | Industrial valves - Testing of metallic valves - Part 1: Pressure tests, test procedures and acceptance criteria - Mandatory requirements |
| EN 1515-2:2001 | Flanges and their joints - Bolting - Part 2: Classification of bolt materials for steel flanges, PN designated |
| NEN 3650 : 1992 C1 1996 | REQUIREMENTS FOR STEEL PIPELINE TRANSPORTATION SYSTEMS |
| EN 10217-7:2014 | Welded steel tubes for pressure purposes - Technical delivery conditions - Part 7: Stainless steel tubes |
| 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 |
| EN ISO 10806:2003 | Pipework - Fittings for corrugated metal hoses (ISO 10806:2003) |
| EN 13480-3:2017 | Metallic industrial piping - Part 3: Design and calculation |
| BS 1387:1985 | Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads |
| EN 1514-2:2014 | Flanges and their joints - Gaskets for PN-designated flanges - Part 2: Spiral wound gaskets for use with steel flanges |
| EN ISO 10380:2012 | Pipework - Corrugated metal hoses and hose assemblies (ISO 10380:2012) |
| DVGW VP 302 : 2006 | GAS-ABSPERRARMATUREN AUS POLYETHYLEN (PE 80 UND PE 100); ANFORDERUNGEN UND PRUEFUNGEN |
| EN 61779-5:2000 | Electrical apparatus for the detection and measurement of flammable gases - Part 5: Performance requirements for group II apparatus indicating a volume fraction up to 100 % gas |
| CEN/TR 13480-7:2017 | Metallic industrial piping - Part 7: Guidance on the use of conformity assessment procedures |
| ISO 10380:2012 | Pipework — Corrugated metal hoses and hose assemblies |
| ISO 15609-1:2004 | Specification and qualification of welding procedures for metallic materials Welding procedure specification Part 1: Arc welding |
| ISO 12944-1:2017 | Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 1: General introduction |
| BS 2789:1985 | Specification for spheroidal graphite or nodular graphite cast iron |
| EN 437:2003+A1:2009 | Test gases - Test pressures - Appliance categories |
| ISO 9329-2:1997 | Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 2: Unalloyed and alloyed steels with specified elevated temperature properties |
| ISO/IEC 17020:2012 | Conformity assessment — Requirements for the operation of various types of bodies performing inspection |
| NFT 54 066 : 1987 | PLASTIQUES - RACCORDS EN POLYETHYLENE A EMBOITURES ELECTROSOUDABLES POUR RESEAUX DE DISTRIBUTION DE COMBUSTIBLES GAZEUX - SPECIFICATIONS ET METHODES D'ESSAIS |
| IEC 60529:1989+AMD1:1999+AMD2:2013 CSV | Degrees of protection provided by enclosures (IP Code) |
| DIN 1630:1984-10 | HIGH PERFORMANCE SEAMLESS CIRCULAR UNALLOYED STEEL TUBES - TECHNICAL DELIVERY CONDITIONS |
| DVGW VP 607 : 1994 | |
| NFA 32 201 : 1987 | FOUNDRY PRODUCTS - CASTING PRODUCTS - UNALLOYED SPHEROIDAL GRAPHITE IRON CASTINGS |
| EN 1555-4:2011 | Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 4: Valves |
| EN 334:2005+A1:2009 | Gas pressure regulators for inlet pressures up to 100 bar |
| EN 10204:2004 | Metallic products - Types of inspection documents |
| EN 60079-10:2003 | Electrical apparatus for explosive gas atmospheres - Part 10: Classification of hazardous areas |
| NFE 29 591 : 1980 | TUYAUTERIES EN CUIVRE - RACCORDS EN CUIVRE ET ALLIAGE DE CUIVRE, A BRASER PAR CAPILLARITE, UTILISES SOUS PRESSION |
| IEC 60079-14:2013 | Explosive atmospheres - Part 14: Electrical installations design, selection and erection |
| EN 13786:2004+A1:2008 | Automatic change-over valves having a maximum outlet pressure of up to and including 4 bar with a capacity of up to and including 100 kg/h, and their associated safety devices for butane, propane or their mixtures |
| EN 12068:1998 | Cold-rolled flat products made of high yield strength micro-alloyed steels for cold forming - General delivery conditions |
| EN 751-1:1996 | Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 1: Anaerobic jointing compounds |
| EN 1563:2011 | Founding - Spheroidal graphite cast irons |
| NFT 54 067 : 1987 | PLASTIQUES - ROBINETS POUR RESEAUX EN POLYETHYLENE DE DISTRIBUTION DE COMBUSTIBLES GAZEUX - SPECIFICATIONS ET METHODES D'ESSAIS |
| DIN 8074:2011-12 | Polyethylene (PE) - Pipes PE 80, PE 100 - Dimensions; Text in German and English |
| EN ISO 15609-1:2004 | Specification and qualification of welding procedures for metallic materials - Welding procedure specification - Part 1: Arc welding (ISO 15609-1:2004) |
| EN 61779-1 : 2000 AMD 11 2004 | ELECTRICAL APPARATUS FOR THE DETECTION AND MEASUREMENT OF FLAMMABLE GASES - PART 1: GENERAL REQUIREMENTS AND TEST METHODS |
| EN 1555-5:2010 | Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 5: Fitness for purpose of the system |
| EN 12007-2:2012 | Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 2: Specific functional requirements for polyethylene (MOP up to and including 10 bar) |
| EN 1555-2:2010 | Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 2: Pipes |
| EN ISO 898-1:2013 | Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws and studs with specified property classes - Coarse thread and fine pitch thread (ISO 898-1:2013) |
| DVGW GW 2 : 2012 | ASSEMBLAGE DE TUBES CUIVRE POUR INSTALLATIONS DE GAZ ET D'EAU A L'INTERIEUR DE TERRAINS ET DE BATIMENTS |
| EN 10083-1:2006 | Steels for quenching and tempering - Part 1: General technical delivery conditions |
| EN 60079-14:2014/AC:2016 | EXPLOSIVE ATMOSPHERES - PART 14: ELECTRICAL INSTALLATIONS DESIGN, SELECTION AND ERECTION (IEC 60079-14:2013/COR1:2016) |
| EN 13785:2005+A1:2008 | Regulators with a capacity of up to and including 100 kg/h, having a maximum nominal outlet pressure of up to and including 4 bar, other than those covered by EN 12864 and their associated safety devices for butane, propane or their mixtures |
| EN 13134:2000 | Brazing - Procedure approval |
| EN 13774:2013 | Valves for gas distribution systems with maximum operating pressure less than or equal to 16 bar - Performance requirements |
| ISO 9000:2015 | Quality management systems — Fundamentals and vocabulary |
| IEC 61779-5:1998 | Electrical apparatus for the detection and measurement of flammable gases - Part 5: Performance requirements for group II apparatus indicating a volume fraction up to 100 % gas |
| ISO 10806:2003 | Pipework Fittings for corrugated metal hoses |
| EN 10084:2008 | Case hardening steels - Technical delivery conditions |
| DIN 3537-1:2011-09 | GAS STOP VALVES FOR DOMESTIC GAS INSTALLATIONS UP TO 5 BAR - REQUIREMENTS AND TESTS |
| EN 10216-1:2013 | Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 1: Non-alloy steel tubes with specified room temperature properties |
| DVGW G 477 : 1983 | MANUFACTURE, QUALITY ASSURANCE AND TESTING OF RIGID PVC AND HDPE FOR GAS PIPELINES AND SPECIFICATIONS FOR PIPE JOINTS AND PIPE COMPONENTS |
| NFA 35 574 : 1990 | IRON AND STEEL PRODUCTS - GENERAL PURPOSE STAINLESS STEELS - GRADES 2: SEMI-FINISHED PRODUCTS AND BARS |
| EN 60529:1991/AC:2016-12 | DEGREES OF PROTECTION PROVIDED BY ENCLOSURES (IP CODE) (IEC 60529 EDITION 2.2 CORRIGENDUM 2:2015) |
| EN 14291:2004 | Foam producing solutions for leak detection on gas installations |
| EN ISO 15610:2003 | Specification and qualification of welding procedures for metallic materials - Qualification based on tested welding consumables (ISO 15610:2003) |
| ISO 15607:2003 | Specification and qualification of welding procedures for metallic materials General rules |
| EN 331:2015 | Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings |
| EN 571-1:1997 | Non destructive testing - Penetrant testing - Part 1: General principles |
| EN 10208-1:2009 | Steel pipes for pipelines for combustible fluids - Technical delivery condi-tions - Part 1: Pipes of requirement class A |
| EN 13480-5:2017 | Metallic industrial piping - Part 5: Inspection and testing |
| EN 10220:2002 | Seamless and welded steel tubes - Dimensions and masses per unit length |
| ISO 3506-2:2009 | Mechanical properties of corrosion-resistant stainless steel fasteners Part 2: Nuts |
| DVGW VP 608 : 1995 | PIPES OF POLYETHYLEN (PE 80 AND PE 100) FOR GAS- AND WATER PIPELINES - REQUIREMENTS AND TESTING |
| EN 970:1997 | Non-destructive examination of fusion welds - Visual examination |
| EN 10226-1:2004 | Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads - Dimensions, tolerances and designation |
| EN 1290:1998/A2:2003 | NON-DESTRUCTIVE EXAMINATION OF WELDS - MAGNETIC PARTICLE EXAMINATION OF WELDS |
| IEC 61779-1:1998 | Electrical apparatus for the detection and measurement of flammable gases - Part 1: General requirements and test methods |
| NFA 35 561 : 1992 | IRON AND STEEL PRODUCTS - GENERAL PURPOSE FREE CUTTING STEEL BARS, WIRE-RODS AND WIRES |
| DIN 17440:2001-03 | STAINLESS STEELS - TECHNICAL DELIVERY CONDITIONS FOR DRAWN WIRE |
| EN 14141:2013 | Valves for natural gas transportation in pipelines - Performance requirements and tests |
| ISO 228-1:2000 | Pipe threads where pressure-tight joints are not made on the threads Part 1: Dimensions, tolerances and designation |
| EN 25817 : 1992 | ARC WELDED JOINTS IN STEEL - GUIDANCE ON QUALITY LEVELS FOR IMPERFECTIONS |
| EN ISO 9000:2015 | Quality management systems - Fundamentals and vocabulary (ISO 9000:2015) |
| EN 10253-2:2007 | Butt-welding pipe fittings - Part 2: Non alloy and ferritic alloy steels with specific inspection requirements |
| EN ISO 15607:2003 | Specification and qualification of welding procedures for metallic materials - General rules (ISO 15607:2003) |
| EN ISO/IEC 17020:2012 | Conformity assessment - Requirements for the operation of various types of bodies performing inspection (ISO/IEC 17020:2012) |
| EN 10255:2004+A1:2007 | Non-Alloy steel tubes suitable for welding and threading - Technical delivery conditions |
| ISO 898-1:2013 | Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread |
| EN 10088-1:2014 | Stainless steels - Part 1: List of stainless steels |
| SAE J 995 : 2012 | MECHANICAL AND MATERIAL REQUIREMENTS FOR STEEL NUTS |
| DIN 2391-2:1994-09 | SEAMLESS PRECISION STEEL TUBES - PART 2: TECHNICAL DELIVERY CONDITIONS |
| EN ISO 3506-2:2009 | Mechanical properties of corrosion-resistant stainless steel fasteners - Part 2: Nuts (ISO 3506-2:2009) |
| EN 287-1:2011 | Qualification test of welders - Fusion welding - Part 1: Steels |
| EN 12186:2014 | Gas infrastructure - Gas pressure regulating stations for transmission and distribution - Functional requirements |
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