1、BSI Standards PublicationBS EN 14071:2015LPG equipment and accessories Pressure relief valves for LPGpressure vessels AncillaryequipmentBS EN 14071:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 14071:2015. Itsupersedes BS EN 14071:2004 which is withdrawn.
2、The UK participation in its preparation was entrusted to TechnicalCommittee PVE/19, LPG containers and their associated fittings.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions o
3、f a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 79707 1ICS 23.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under t
4、he authority of theStandards Policy and Strategy Committee on 31 May 2015.Amendments issued since publicationDate Text affectedBS EN 14071:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14071 May 2015 ICS 23.060.40 Supersedes EN 14071:2004English Version LPG equipment and accessories - Pre
5、ssure relief valves for LPG pressure vessels - Ancillary equipment quipements pour GPL et leurs accessoires - Soupapes de scurit des rservoirs de gaz de ptrole liqufi (GPL) - quipement auxiliaire Flssiggas-Gerte und Ausrstungsteile - Druckentlastungsventile fr Behlter fr Flssiggas (LPG) -Zusatzausrs
6、tung This European Standard was approved by CEN on 5 March 2015. 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 r
7、eferences 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
8、 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 Maced
9、onia, 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 COMIT EUROPEN DE NORMALISATION EURO
10、PISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14071:2015 EBS EN 14071:2015EN 14071:2015 (E) 2 Contents Page Foreword 4 Introduction
11、.5 1 Scope 6 2 Normative references 6 3 Terms and definitions .7 4 Operating conditions .8 5 Materials .9 5.1 General 9 5.2 Metallic materials .9 5.3 Non-metallic components 10 5.4 Lubricants, sealants, and adhesives 10 5.5 Inspection Documents . 10 6 Design 10 6.1 Introduction . 10 6.2 Pressure rel
12、ief valve isolating devices . 10 6.2.1 General . 10 6.2.2 Actuation . 11 6.2.3 Indication of closure . 11 6.2.4 Guiding arrangements . 11 6.2.5 Isolating mechanism security . 11 6.2.6 Interchangeability . 11 6.3 PRV manifold . 12 6.3.1 General . 12 6.3.2 Indication of port closure . 15 6.3.3 Port cl
13、osure . 15 6.4 Vent pipe 15 6.4.1 Design 15 6.4.2 Materials 15 6.4.3 Effect from external conditions . 15 6.5 Connections 15 6.6 Threads 15 6.7 Minimum requirements for springs 16 7 Testing of the design 16 7.1 General . 16 7.2 Test requirements . 16 7.3 Hydraulic proof test 17 7.4 Relief valve isol
14、ator test . 17 7.5 Testing of audible signal of isolating devices and residual flow of isolating devices and PRV manifolds . 17 7.6 Resistance of the isolating mechanism . 17 7.7 Over-torque deformation test 18 7.8 Operation test 18 7.8.1 General . 18 7.8.2 System test 18 7.9 Stress cracking test 18
15、 7.9.1 General . 18 7.9.2 Mercury(I)nitrate immersion test . 18 BS EN 14071:2015EN 14071:2015 (E) 3 7.9.3 Moist ammonia air stress cracking test 19 8 Production testing of isolating devices and PRV manifolds 19 9 Marking and labelling 19 9.1 PRV isolating device . 19 9.2 Pressure relief valve PRV ma
16、nifolds . 19 10 User instructions . 20 10.1 PRV isolating devices . 20 10.2 PRV manifolds . 20 Annex A (normative) Dimensions of master test pieces for PRV and isolating devices 21 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23
17、/EC for pressure equipment 23 Bibliography 25 BS EN 14071:2015EN 14071:2015 (E) 4 Foreword This document (EN 14071:2015) has been prepared by Technical Committee CEN/TC 286 “Liquefied petroleum gas equipment and accessories”, the secretariat of which is held by NSAI. This European Standard shall be
18、given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2015, and conflicting national standards shall be withdrawn at the latest by November 2015. Attention is drawn to the possibility that some of the elements of this documen
19、t 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 14071:2004. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Associati
20、on, 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. The major changes in this revision include: the removal of requirements for protection caps; the introduction of additional testing
21、; an update of the terminology. 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 Re
22、public 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 14071:2015EN 14071:2015 (E) 5 Introduction This E
23、uropean 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 is recommended that manufa
24、cturers develop an environmental management policy. For guidance, see the EN ISO 14000 series 1, 2 and 3. 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 pressur
25、es 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 uncertai
26、nty leaflet” SP INFO 2000 27 5. BS EN 14071:2015EN 14071:2015 (E) 6 1 Scope This European Standard specifies the design, testing and inspection requirements for pressure relief valve isolating devices, valve manifolds, vent pipes and system assemblies which are, where necessary, used with pressure r
27、elief valves for use in static pressure vessels for Liquefied Petroleum Gas (LPG) service. This European Standard addresses both prototype testing and production testing of isolating devices and PRV manifolds. Pressure relief valves for LPG pressure vessels are specified in EN 14129:2014. 2 Normativ
28、e 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) app
29、lies. EN 549:1994, Rubber materials for seals and diaphragms for gas appliances and gas equipment EN 751-1, 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, Sealing materials for metallic threade
30、d joints in contact with 1st, 2nd and 3rd family gases and hot water Part 2: Non-hardening jointing compounds EN 751-3, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water Part 3: Unsintered PTFE tapes EN 1092-1, Flanges and their joints Circula
31、r flanges for pipes, valves, fittings and accessories, PN designated Part 1: Steel flanges 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 sp
32、ecified in European Standards EN 1503-3:2000, Valves Materials for bodies, bonnets and covers Part 3: Cast irons 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 grap
33、hite cast irons EN 10204:2004, Metallic products Types of inspection documents 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 EN 12165:2011, Copper and copper alloys Wrought and unwrought
34、forging stock EN 12420, Copper and copper alloys Forgings EN 13480-3:2012, Metallic industrial piping Part 3: Design and calculation BS EN 14071:2015EN 14071:2015 (E) 7 EN 13906-1, Cylindrical helical springs made from round wire and bar Calculation and design Part 1 : Compression springs EN 14129:2
35、014, LPG Equipment and accessories Pressure relief valves for LPG pressure vessels ISO 6957, Copper alloys Ammonia test for stress corrosion resistance ASME B1.20.1:2013, Pipe threads, general purpose (inch) 3 Terms and definitions For the purposes of this document, the following terms and definitio
36、ns 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 gase
37、s 3.2 pressure vessel assembly of the pressure envelope (including the openings and their closures) and non-pressure-retaining parts attached directly to it 3.3 pressure relief valve (PRV) self-closing valve which automatically, without the assistance of any energy other than that of the vapour conc
38、erned, discharges vapour at a predetermined pressure, and operates with a pop action Note 1 to entry: This is known as a “safety valve” in ADR. 3.4 pressure relief valve system PRV system pressure relief valve(s) for use on the pressure vessel complete with isolating device or PRV manifold, and vent
39、 pipe where appropriate 3.5 pressure relief valve isolating device device fitted between the storage tank and the external pressure relief valve, which permits the replacement of the pressure relief valve without de-pressuring the pressure vessel 3.6 coefficient of discharge Kd ratio of the actual m
40、easured flow capacity divided by the calculated theoretical capacity for the same fluid at the same operating conditions 3.7 pressure relief valve manifold PRV manifold device fitted to a storage vessel permitting two or more pressure relief valves to be fitted only one of which can be isolated at a
41、 time, which permits replacement of the isolated pressure relief valve without depressurizing the vessel BS EN 14071:2015EN 14071:2015 (E) 8 3.8 discharge capacity capacity at the flow rating pressure of a pressure relief valve expressed in cubic metres per minute of free air at STP 3.9 vent pipe op
42、en-ended pipe, fitted with a protection cap and attached to the pressure relief valve outlet, to direct discharged fluid away from the protected pressure vessel surface 3.10 design signal flow limited flow of LPG intended to equalise pressures so that a replacement PRV can be properly fitted to an i
43、solating device; indicate the effectiveness of the internal shut off in an isolating device before the PRV is completely removed; and produce an acoustic signal 3.11 Standard Temperature and Pressure STP 15,6 C (288,7 K), 1,013 bar absolute (0,1013 MPa absolute) 3.12 flow rating pressure inlet press
44、ure at which the discharge capacity is measured 3.13 lift actual travel of the sealing disc away from the closed position 3.14 sealing element non-metallic resilient component which effects a seal by contact with the valve seat 3.15 valve seat normally raised area of the pressure relief valve body o
45、n to which the sealing element effects a seal 3.16 maximum allowable pressure PS maximum pressure for which the equipment is designed Note 1 to entry: All pressures are gauge pressures unless otherwise stated. 3.17 nominal diameter (DN) numerical designation of the size of a component, which is a co
46、nvenient round number, approximately equal to the manufacturing dimensions in millimetres (mm) 3.18 external leak tightness resistance to leakage through the fitting to or from the atmosphere 4 Operating conditions 4.1 Equipment designed in accordance with this European Standard shall be suitable fo
47、r: BS EN 14071:2015EN 14071:2015 (E) 9 minimum operating temperature of 20C; maximum operating temperature of 65C; maximum allowable pressure of 25 bar; and minimum pressure of 50 mbar absolute. 4.2 For some parts of Europe and certain applications, temperatures lower than - 20C can be encountered.
48、For these conditions, a temperature rating of - 40C shall apply. NOTE 1 In service, temperatures below this can be encountered during short periods, for example, during discharge. NOTE 2 Vacuum conditions on the isolating device or PRV manifold, arising from butane at low temperature or evacuation o
49、f the pressure vessel can expose the valve or fitting to a vacuum of 50 mbar absolute. 5 Materials 5.1 General 5.1.1 All materials in contact with LPG shall be physically and chemically compatible with LPG under all normal operating conditions for which the device is intended to be used. 5.1.2 Material for components shall be selected for adequate strength in service. The material shall resist atmospheric corrosion, brass dezincification, stress corrosion, impact and material failure. Whe
