Bsi bs en 13175 2014

BS EN 13175:2014 BSI Standards Publication LPG Equipment and accessories — Specification and testing for Liquefied Petroleum Gas (LPG) pressure vessel valves and fittings BS EN 13175:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 13175:2014 It supersedes BS EN 13175:2003 which is withdrawn The UK participation in its preparation was entrusted to Technical Committee PVE/19, LPG containers and their associated fittings A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2014 Published by BSI Standards Limited 2014 ISBN 978 580 71110 ICS 23.060.01 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2014 Amendments issued since publication Date Text affected BS EN 13175:2014 EN 13175 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM November 2014 ICS 23.060.01 Supersedes EN 13175:2003+A2:2007 English Version LPG Equipment and accessories - Specification and testing for Liquefied Petroleum Gas (LPG) pressure vessel valves and fittings Équipements pour GPL et leurs accessoires - Spécifications et essais des équipements et accessoires des réservoirs pour gaz de pétrole liquéfié (GPL) Flüssiggas-Geräte und Ausrüstungsteile - Spezifikation und Prüfung für Ventile und Fittinge an Druckbehältern für Flüssiggas (LPG) This European Standard was approved by CEN on 14 September 2014 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 13175:2014 E BS EN 13175:2014 EN 13175:2014 (E) Contents Page Foreword Introduction Scope Normative references Terms and definitions Operating conditions .9 5.1 5.2 5.3 5.4 Materials 10 General 10 Metallic materials 10 Non-metallic components 11 Lubricants, sealants and adhesives 11 6.1 6.2 6.3 6.4 6.5 Design – general requirements 11 General 11 Seats and seals 12 Springs 12 Threads 12 Flanges 12 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 7.11 7.12 Design - specific requirements 12 Excess flow valve 12 Non-return valve 13 Shut-off valves 13 Filler valve 14 Filler valve with OPD 15 Occasional liquid withdrawal valve 15 Internal valve 16 Vapour equalizing valve 16 Multipurpose valve 16 Break-away coupling 16 Dry disconnect coupling 16 Pressure gauge 18 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 8.10 8.11 8.12 8.13 8.14 8.15 8.16 Testing of the design 18 General 18 Testing of non-metallic components 18 Over torquing deformation test 20 External leak tightness test 20 Internal leak tightness test 21 Residual flow test 21 Pressure strength test 22 Excess flow test 22 Endurance test 23 Weak section strength test 24 Stress cracking test 24 Vacuum test 25 Flow resistance test 25 Filler valve flow test 25 OPD test 25 Test report 26 BS EN 13175:2014 EN 13175:2014 (E) Production testing 26 10 Marking 26 11 Documentation 27 12 Packaging 27 Annex A (normative) ACME connections 28 Annex B (normative) Special low temperature requirements for valves 32 Annex C (informative) Inspection of ¼ inch ACME Couplings 33 C.1 Introduction 33 C.2 Definitions 33 C.3 Visual examination 34 C.4 Dimensional check 34 Annex D (normative) Dry disconnect couplings 36 Annex E (normative) Production testing and inspection 41 Bibliography 44 BS EN 13175:2014 EN 13175:2014 (E) Foreword This document (EN 13175:2014) has been prepared by Technical Committee CEN/TC 286 “LPG Equipment and accessories - Specification and testing for Liquefied Petroleum Gas (LPG) pressure vessel valves and fittings”, the secretariat of which is held by NSAI This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2015 and conflicting national standards shall be withdrawn at the latest by May 2015 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights This document supersedes EN 13175:2003+A2:2007 This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s) For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document This European Standard has been submitted for reference into: — the technical annexes of the ADR [4] NOTE These regulations take precedence over any clause of this European Standard It is emphasized that ADR is being revised regularly at intervals of two years which may lead to temporary non-compliances with the clauses of this European Standard The major changes to this revision include: — reference to the RID and ADN has been removed; — the addition of aluminium alloys and zinc alloys; — additional requirements for brass materials; — change in requirements for non-metallic components, lubricants, sealants and adhesives; — the insertion of filler valve with overfill protection device, dry disconnect coupling requirements and the deletion of plug and cap requirements; — the introduction of Annex C (informative), Inspection of ¼ inch x ACME coupling; — the introduction of Annex D (normative), Dry disconnect couplings According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom BS EN 13175:2014 EN 13175:2014 (E) Introduction This European Standard calls for the use of substances and procedures that may be injurious to health and/or the environment if adequate precautions are not taken It refers only to technical suitability; it does not absolve the user from their legal obligations at any stage It has been assumed in the drafting of this European Standard that the execution of its provisions is entrusted to appropriately qualified and experienced people All pressures are gauge pressures unless otherwise stated NOTE This European Standard requires measurement of material properties, dimensions and pressures All such measurements are subject to a degree of uncertainty due to tolerances in measuring equipment, etc It may be beneficial to refer to the leaflet “measurement uncertainty leaflet” SP INFO 2000 27 [8] BS EN 13175:2014 EN 13175:2014 (E) Scope This European Standard specifies minimum requirements for the design, testing and production testing of valves, including appropriate fittings, which are connected to mobile or static LPG pressure vessels above 150 l water capacity Pressure relief valves and their ancillary equipment, contents gauges and automotive LPG components are outside the scope of this European Standard This European Standard does not apply to refineries or other process plants Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies EN 549:1994, Rubber materials for seals and diaphragms for gas appliances and gas equipment 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 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 EN 751-3:1996, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 3: Unsintered PTFE tapes EN 837-1, Pressure gauges - Part 1: Bourdon tube pressure gauges - Dimensions, metrology, requirements and testing EN 1092-1:2007+A1:2013, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges EN 1267:2012, Industrial valves - Test of flow resistance using water as test fluid EN 1503-1:2000, Valves - Materials for bodies, bonnets and covers - Part 1: Steels specified in European Standards EN 1503-2:2000, Valves - Materials for bodies, bonnets and covers - Part 2: Steels other than those specified in European Standards EN 1503-4:2002, Valves - Materials for bodies, bonnets and covers - Part 4: Copper alloys specified in European Standards EN 1563:2011, Founding - Spheroidal graphite cast irons 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 EN 1774:1997, Zinc and zinc alloys - Alloys for foundry purposes - Ingot and liquid EN 1983, Industrial valves - Steel ball valves EN 10270-3:2011, Steel wire for mechanical springs - Part 3: Stainless spring steel wire EN 12164:2011, Copper and copper alloys - Rod for free machining purposes BS EN 13175:2014 EN 13175:2014 (E) EN 12165:2011, Copper and copper alloys - Wrought and unwrought forging stock EN 12420:2014, Copper and copper alloys - Forgings EN 13547, Industrial valves - Copper alloy ball valves EN 13709:2010, Industrial valves - Steel globe and globe stop and check valves EN 13789:2010, Industrial valves - Cast iron globe valves EN 13799:2012, LPG equipment and accessories - Contents gauges for Liquefied Petroleum Gas (LPG) pressure vessels EN 13906-1:2013, Cylindrical helical springs made from round wire and bar - Calculation and design - Part 1: Compression springs EN 15202:2012, LPG equipment and accessories - Essential operational dimensions for LPG cylinder valve outlet and associated equipment connections EN 60079-0, Explosive Atmospheres - Part 0: Equipment - General requirements (IEC 60079-0) EN ISO 196:1995, Wrought copper and copper alloys - Detection of residual stress - Mercury(I) nitrate test (ISO 196:1978) ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads - Part 1: Dimensions, tolerances and designation ISO 301:2006, Zinc alloy ingots intended for castings ISO 2859-1:1999, Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection ISO 6957:1988, Copper alloys - Ammonia test for stress corrosion resistance ANSI/ASME B1.20.1 - 1983, Pipe threads, general purpose (inch) issued by American National Standards Institute in 1983 ASME B1.5 - 1990, ACME Screw Threads issued by American Society of Mechanical Engineers in 1990 Terms and definitions For the purposes of this document, the following terms and definitions apply 3.1 liquefied petroleum gas LPG low pressure liquefied gas composed of one or more light hydrocarbons which are assigned to UN 1011, UN 1075, UN 1965, UN 1969 or UN 1978 only and which consists mainly of propane, propene, butane, butane isomers, butene with traces of other hydrocarbon gases 3.2 pressure vessel assembly of the pressure envelope (including the openings and their closures) and non-pressure-retaining parts attached directly to it BS EN 13175:2014 EN 13175:2014 (E) 3.3 maximum allowable pressure maximum pressure for which the equipment is designed Note to entry: All pressures are gauge pressures unless otherwise stated 3.4 fitting pressure containing component fitted to an LPG pressure system 3.6 internal leak tightness resistance to leakage across the valve seal or other internal sealing components when the valve is closed 3.7 external leak tightness resistance to leakage through the fitting to or from the atmosphere 3.8 residual flow allowable flow through an excess flow or a non-return valve, when the valve is in the closed position 3.9 sealing element non-metallic resilient component which effects a seal by contact with the valve seat 3.10 excess flow valve valve designed to close automatically, with a small residual flow, when the fluid flow passing through it exceeds a predetermined value, and to re-open when the pressure differential across the valve has been restored below a certain value 3.11 non-return valve valve designed to close automatically to restrict reverse flow 3.12 shut-off valve valve to provide a leak tight seal which is operated either manually, remotely or is self-closing 3.13 service valve valve for fluid off-take which is manually operated to provide a leak tight seal 3.14 filler valve valve system for liquid fill service 3.15 plug component which seals a female connection 3.16 cap component which seals a male connection BS EN 13175:2014 EN 13175:2014 (E) Annex B (normative) Special low temperature requirements for valves Valves which are used under extreme low temperature conditions (temperatures below −20 °C) shall meet the following requirements: +0 −5 ) °C for 24 h; and a) the valve shall be subjected to a temperature of (−40 b) the temperature shall be then raised to −30 °C and the valve or fitting shall then pass the external leak tightness test as per 8.4 and the internal leak tightness test as per 8.5 32 BS EN 13175:2014 EN 13175:2014 (E) Annex C (informative) Inspection of ¼ inch ACME Couplings C.1 Introduction This annex specifies the requirements for inspection of ¼ inch ACME threaded couplings and end fittings These inspections are critical in the case of the ¼ inch ACME due to the small thread size on the relatively large diameter coupling, but may not be required for the smaller diameter couplings This procedure applies to all ¼ inch ACME connectors wherever they are fitted, e.g on road tankers, bulk storage installations and all liquid transfer equipment The checks are to be carried out on both male and female couplings This procedure is to identify potentially worn ACME couplings and connectors for replacement To detect damage, thread wear beyond acceptable limits and the need for replacement seals, regular inspection of male and female couplings including both threads should be carried out ACME threads are parallel but wear can vary along their length with most of the wear likely to be on the first thread This should be a visual inspection of the coupling for wear and damage together with a thread dimensional check It is not sufficient to use only a “No-Go” gauge to check the threads as this may not identify worn or distorted threads Pressure testing is not a suitable method of inspection The nature and frequency of the inspection should be appropriate to the design, materials of construction and duty of the couplings involved but should not be less than once a year for plant, hose and tanker couplings A lesser frequency may be considered where couplings are fitted to bulk storage pressure vessels at consumer premises which are filled less than five times a year For example, a visual inspection at the time of filling then a gauge and/or measurement inspection at intervals not exceeding 10 years C.2 Definitions C.2.1 male coupling coupling with a male thread C.2.2 female coupling coupling which includes a female threaded loose nut on a centre spigot 33 BS EN 13175:2014 EN 13175:2014 (E) C.3 Visual examination C.3.1 Visual examination should be carried out with particular emphasis on: — narrowing or distortion of the thread form; — cracks, dents, bulges cracked or broken threads (any of which may weaken the fitting); — worn threads with a “stepped” appearance (see below); — other uneven wear of the threads; — debris in the threads; — excessive corrosion or pitting; particularly of steel threads; — damage or distortion of the internal cone on a female vapour coupling; — damage to or absence of the pin on male vapour balance coupling; — damage to the “lugs” of female couplings nuts (if the “lugs” of female coupling have been damaged this may prevent the use of the correct wrench and may indicate a “stretched” thread); — damage to the rubber seal of male couplings; and — damage to the sealing face of the female couplings C.3.2 Where a fault is identified, it shall be immediately rectified If rectification is not possible, the coupling is deemed to fail the visual examination and it shall be prevented from being used further Failed couplings shall be removed from service, disabled so as to prevent further accidental usage and shall be scrapped C.4 Dimensional check C.4.1 Visual inspection of ACME threads may not always show potentially dangerous conditions The majority of thread wear occurs: — above the thread pitch diameter of a male thread; — on the major diameter of the male thread; — below the thread pitch diameter of a female thread; — on the minor diameter of the female thread C.4.2 The coupling shall be replaced when there is a maximum of 0,5 mm wear on the flank angle, after the 1st incomplete thread C.4.3 Male couplings shall be subjected to a dimensional check to ensure that the diameter has not been reduced below an acceptable level Female couplings shall be subjected to a dimensional check to ensure that the diameter has not been increased above an acceptable level In addition the coupling shall be subjected to a “No-Go” gauge test which may identify wear on the flank of the thread C.4.4 The coupling shall be replaced when the major diameter of a male thread and the minor diameter of a female thread exceed the dimensions given in Table C.1 These dimensions are based on a wear allowance of 25 % of the thread engagement 34 BS EN 13175:2014 EN 13175:2014 (E) Table C.1 — Acceptable thread sizes Thread Size Acceptable minimum major diameter (male thread) Acceptable maximum minor diameter (female thread) ¼ inch ACME x TPI 82,02 mm 78,85 mm C.4.5 Threads shall be measured to confirm they conform and are acceptable to the dimensions given in Table C.1 Four measurements are taken equally spaced along the thread length, at axial interval angles of 45° C.4.6 If the “No-Go” thread gauge can be threaded more than one turn onto (or into) an ACME coupling, this indicates unacceptable thread wear of the coupling A “No-Go” gauge may not identify a worn thread, if the thread is damaged, oval or distorted thus giving a false result 35 BS EN 13175:2014 EN 13175:2014 (E) Annex D (normative) Dry disconnect couplings D.1 The general arrangement of dry disconnect couplings shall be as shown in Figure D.1, Figure D.2, Figure D.3 and Figure D.4 D.2 The dimensions of dry disconnect couplings shall be as shown in Figure D.5 and Figure D.6 The dimensions of the gaskets shall take into account the characteristics of the gasket material in order to ensure the leak tightness, the inter-changeability and the good functioning of the dry disconnect coupling Coupling for vapour line DN 50 Coupling for liquid line DN 80 Key A1 92 mm B1 126 mm A2 Flange inch ANSI Class 300 B2 Flange inch ANSI Class 300 Figure D.1 — Pressure vessel unit with flange 36 BS EN 13175:2014 EN 13175:2014 (E) Coupling for vapour line DN 50 Coupling for liquid line DN 80 Key A1 103 mm B1 144 mm A2 inch NPT internal thread B2 inch NPT internal thread Figure D.2 — Pressure vessel unit with thread Coupling for vapour line DN 50 Coupling for liquid line DN 80 Key A1 71 mm B1 119 mm A2 220 mm B2 262 mm A3 Flange inch ANSI Class 300 B3 Flange inch ANSI Class 300 A4 maximum 226 mm B4 maximum 340 mm Figure D.3 — Hose unit with flange 37 BS EN 13175:2014 EN 13175:2014 (E) Coupling for vapour line DN 50 Coupling for liquid line DN 80 Key A1 71 mm B1 119 mm A2 156 mm B2 202 mm A3 inch NPT internal thread B3 inch NPT internal thread A4 maximum 226 mm B4 maximum 340 mm Figure D.4 — Hose unit with thread 38 BS EN 13175:2014 EN 13175:2014 (E) Key A1 Minimum piston movement 36 mm A2 7,865 mm ± 0,015 mm A3 0,8 mm ± 0,8 mm A4 Ø 118,95 mm ± 0,05 mm A5 Ø 97,5 mm ± 0,25 mm A6 6° ± 1° A7 Ø 89,2 mm ± 0,3 mm A8 Ø 76,25 ± 0,05 mm A9 2° ± 2° A10 R 2,0 mm ± 0,5 mm A11 7,95 mm ± 0,03 mm A12 16,25 mm ± 0,25 mm A13 48,375 mm ± 0,375 mm A14 16,75 mm ± 0,25 mm Figure D.5 — Coupling DN 80 for product line 39 BS EN 13175:2014 EN 13175:2014 (E) Key A1 Minimum piston movement 13 mm A2 15,6 mm ± 0,1 mm A3 8,5 mm ± 0,1 mm A4 Ø 70,75 mm ± 0,05 mm A5 Ø 57,1 mm ± 0,1 mm A6 Ø 51,4 mm ± 0,2 mm A7 Ø 47,2 mm ± 0,1 mm A8 Ø 41,2 ± 0,2 mm A9 15° A10 R 1,5 mm ± 0,25 mm A11 6,475 mm ± 0,025 mm A12 15,325 mm ± 0,025 mm A13 9,6 mm ± 0,1 mm A14 15,5 mm ± 0,2 mm Figure D.6 — Coupling DN 50 for vapour line 40 BS EN 13175:2014 EN 13175:2014 (E) Annex E (normative) Production testing and inspection E.1 Testing and inspection procedures shall be implemented to ensure that the quality and performance of the manufactured valves comply with the quality and performance of the design E.2 Pressure equipment shall undergo a final inspection to assess visually and by examination of the accompanying documents, compliance with the requirements of the Directive 97/23/EC [6] Tests carried out during manufacture may be taken into account As far as is necessary, on safety grounds, the final inspection shall be carried out internally and externally on every part of the equipment, where appropriate in the course of manufacture (e.g where examination during the final inspection is no longer possible) E.3 Leak tightness testing and a visual examination shall be carried out on each valve or fitting produced and shall be in accordance with Table E.1 These tests shall be carried out at a temperature of between °C and 40 °C E.4 Batch samples shall be taken at a minimum the following tests and inspections shall be carried out: — correct operation; — dimensional verification; — pressure strength test at the test pressure specified in 8.7.3; — material suitability; and — marking E.5 Valves not meeting the requirements of E.2 or E.3 shall be rejected The rejection criteria of ISO 2859-1:1999 for batches of valves not meeting the requirements of E.4 shall be followed 41 BS EN 13175:2014 EN 13175:2014 (E) Table E.1 — Production testing of valves and fittings Clause 8.4 External leak tightness test Internal leak tightness test Excess flow valve 7.1 O N/A Non-return valve 7.2 O O Shut-off valve 7.3 X X Filler valve 7.4 X X Filler valve with OPD 7.5 X X 7.6 X X Internal valve 7.7 X X Vapour equalizing valve 7.8 X X Multipurpose valve 7.9 X X Break-away coupling 7.10 X X Dry disconnect coupling 7.11 X X Occasional valve Table key: liquid withdrawal a X — Mandatory O — External leak tightness test only applicable to pressure containing parts N/A — Not applicable NOTE Test equipment connections are subject to dimensional control to ensure compatibility with the test sample NOTE Other testing procedures may be used, as long as they provide an equivalent level of accuracy a 42 Each part shall be tested separately BS EN 13175:2014 EN 13175:2014 (E) Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide a means of conforming to Essential Requirements of the New Approach Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment Once this standard is cited in the Official Journal of the European Union under that Directive and has been implemented as a national standard in at least one Member State, compliance with the clauses of this standard given in Table ZA.1 confers, within the limits of the scope of this standard, a presumption of conformity with the corresponding Essential Requirements of that Directive and associated EFTA regulations Table ZA.1 — Correspondence between this European Standard and Directive 97/23/EC Clause(s)/sub-clause(s) of this EN Essential requirements (ERs) of directive 97/23/EC Annex I Content 8.2 8.3 8.4 8.6 8.9 8.10 8.11 2.1 Safe throughout intended life Clause Clause excluding 6.1.5, 6.1.6, 6.1.8 and 6.1.11 Clause 8.9 2.2.1 Design for adequate strength Clause 2.2.4 Experimental design method Clause excluding 6.1.5, 6.1.6, 6.1.8 and 6.1.11 Clause 2.3 Safe handling and operation 5.1.1, 5.2.4, 5.2.5, 6.1.7 (physically and chemically compatible) 5.1.2, (brass dezincification) 8.11 2.6 Corrosion and other chemical attack Clause Annex E 3.2.1 Clause 10 3.3 Marking and labelling Clause 11 3.4 Operating instructions 5.2.7 6.1.10 4.1 b) Final inspection Materials – chemical resistance of pressurized parts WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this European Standard 43 BS EN 13175:2014 EN 13175:2014 (E) Bibliography [1] EN ISO 11114-1:2012, Gas cylinders - Compatibility of cylinder and valve materials with gas contents Part 1: Metallic materials (ISO 11114-1:2012) [2] EN ISO 11114-2:2013, Gas cylinders - Compatibility of cylinder and valve materials with gas contents Part 2: Non-metallic materials (ISO 11114-2:2013) [3] Regulations concerning the International Carriage of Dangerous Goods by Rail (RID), appearing as Appendix C to the Convention concerning International Carriage by Rail (COTIF), Vilnius, June 1999, as amended [4] European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR), Geneva, 30 September 1957, as amended [5] Directive 94/9/EC of the European Parliament and the Council of 23 March 1994 on the approximation of the laws of the Member States concerning equipment and protective systems intended for use in potentially explosive atmospheres [6] Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment [7] Directive 2010/35/EU of the European Parliament and of the Council on transportable pressure equipment, Brussels, 16 June 2010, as amended [8] Measurement uncertainty leaflet (SP INFO 2000 27 uncertainty), Magnus Holmgren et al published by Swedish National Testing and Research Institute 44 This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSI is the national body responsible for preparing British Standards and other 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