EN 16631-2015 en LPG equipment and accessories - Pressure relief valves for LPG pressure vessels - Reconditioning requirements《液化石油气设备及配件 液化石油气压力容器的泄压阀 检修要求》.pdf

1、BSI Standards PublicationBS EN 16631:2015LPG equipment and accessories Pressure relief valvesfor LPG pressure vessels Reconditioning requirementsBS EN 16631:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 16631:2015.The UK participation in its preparation w

2、as 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 of a contract. Users are responsible for i

3、ts correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 81190 6ICS 23.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and S

4、trategy Committee on 31 May 2015.Amendments issued since publicationDate Text affectedBS EN 16631:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16631 May 2015 ICS 23.060.40 English Version LPG equipment and accessories - Pressure relief valves for LPG pressure vessels - Reconditioning req

5、uirements quipements pour GPL et leurs accessoires - Soupapes de scurit pour rservoirs de GPL sous pression - Exigences de reconditionnement Flssiggas-Gerte und Ausrstungsteile - Sicherheitsventile fr Druckbehlter fr Flssiggas (LPG) - Anforderungen an die Instandsetzung This European Standard was ap

6、proved 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 references concerning such national

7、 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

8、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, Hun

9、gary, 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 EUROPISCHES KOMITEE FR NORMUNG CEN-CEN

10、ELEC 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 16631:2015 EBS EN 16631:2015EN 16631:2015 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 5 2 Normative reference

11、s 5 3 Terms and definitions .5 4 General 6 5 Materials .6 5.1 General 6 5.2 Lubricants, sealants and adhesives 6 5.3 Shelf life 6 5.3.1 Shelf life of components .6 5.3.2 Storage life of assembled PRVs .7 6 Inspection .7 7 Reconditioning .7 8 Pressure setting .8 8.1 General 8 8.2 Setting and testing

12、of PRVs 8 9 Changing the set pressure .9 10 Marking .9 11 Documentation/Certification .9 12 Operating instructions 9 Annex A (informative) Assessment of PRVs by sampling . 11 A.1 General testing of PRVs on a sampling basis . 11 A.2 Sample size . 11 A.3 Sample selection. 11 A.4 Inspection period 12 A

13、.5 Pass criteria . 12 Bibliography . 13 BS EN 16631:2015EN 16631:2015 (E) 3 Foreword This document (EN 16631:2015) 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 given

14、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 document may

15、be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria,

16、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, Sw

17、itzerland, Turkey and the United Kingdom. BS EN 16631:2015EN 16631:2015 (E) 4 Introduction Protection of the environment is a key political issue in Europe and elsewhere. Protection of the environment is taken in a very broad sense. What is meant is the total life cycle aspects of, e.g. a product on

18、 the environment, including expenditure of energy and during all phases from mining of raw materials, fabrication, packaging, distribution, use, scrapping, recycling of materials, etc. Provisions have to be restricted to a general guidance. Limit values are specified in national laws. It is recommen

19、ded that companies using this standard develop an environmental management policy. For guidance see ISO 14000 series. 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. Where judgements ar

20、e called for, it has been assumed that they are made by competent persons who have been trained specifically for the tasks. BS EN 16631:2015EN 16631:2015 (E) 5 1 Scope This European Standard specifies the requirements for the reconditioning, retesting and certification of Pressure Relief Valves (PRV

21、s) for LPG pressure vessels covered under the scope of EN 14129. This European Standard applies to retesting and reconditioning of PRVs that are carried out in a workshop and does not apply to site adjustment of installed PRVs. Annex A is an informative annex detailing a sampling approach for PRV re

22、qualification which should only be used in case of on-site requalification of series produced pressure vessels fitted with series produced PRVs. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application.

23、 For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 751-1, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water Part 1: Anaerobic join

24、ting compounds EN 751-2, 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, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water Part 3: Un

25、sintered PTFE tapes EN 837-1, Pressure gauges Part 1: Bourdon tube pressure gauges Dimensions, metrology, requirements and testing EN 14129, LPG Equipment and accessories Pressure relief valves for LPG pressure vessels ISO 2230, Rubber products Guidelines for storage 3 Terms and definitions For the

26、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,

27、butane isomers, butene with traces of other hydrocarbon gases 3.2 pressure relief valve PRV self-closing valve which automatically, without the assistance of any energy other than that of the vapour concerned, discharges vapour at a predetermined pressure, and operates with a pop action Note 1 to en

28、try: This is known as a “safety valve” in ADR. 3.3 competent person person which by combination of appropriate qualification, training, experience, and resources, is able to make objective judgments on the subject BS EN 16631:2015EN 16631:2015 (E) 6 3.4 setting operation of adjusting and testing the

29、 start to discharge pressure to the nominal set pressure 3.5 reconditioning operation that includes complete dismantling of the valve, evaluation and replacement of components and reassembly 3.6 pop action rapid opening of the pressure relief valve sealing element so that the pressure relief valve i

30、s fully open, resulting from an increase of inlet pressure creating a sudden increase in force and compression of the spring 3.7 sealing element non-metallic moveable resilient component which affects a seal by contact with the pressure relief valve seat 4 General PRVs shall have a storage life of t

31、wo years after assembly. All PRVs shall be subjected to inspection in accordance with Clause 6 prior to reconditioning, setting or changing the set pressure. PRVs where the set pressure (reset) is to be changed, shall meet the requirements of Clause 9. PRVs that have been stored for more than two ye

32、ars, but are less than five years old, shall have the sealing element changed and shall meet the requirements of Clauses 6 and 8. PRVs that have been stored for more than five years shall be reconditioned in accordance with Clauses 6, 7 and 8. PRVs that are to be reconditioned shall be subjected to

33、reconditioning in accordance with Clauses 6, 7 and 8. 5 Materials 5.1 General Components for reconditioning shall meet the Original Equipment Manufacturer (OEM) specification. 5.2 Lubricants, sealants and adhesives Lubricants, sealants and adhesives shall be compatible with LPG and not interfere wit

34、h the operation of the PRV, when used on operating threads and seals. Sealants shall comply with the requirements of EN 751-1, EN 751-2 or EN 751-3. 5.3 Shelf life 5.3.1 Shelf life of components Metallic components, other than springs (see 5.3.2), have an unlimited shelf life. Rubber components shal

35、l have a storage life of 7 years with the ability to extend this to 10 years when the requirements of ISO 2230 are met. Lubricants, sealants and adhesives shall have a shelf life in accordance with the manufacturers instructions. BS EN 16631:2015EN 16631:2015 (E) 7 5.3.2 Storage life of assembled PR

36、Vs After manufacture PRVs may be stored for up to two years when stored in line with the manufacturers recommendations. Manufacturers shall ensure that the functional characteristics of the PRV such as opening pressure, reseating pressure, flow capacity, etc. remain in line with the design standard

37、and the specification during this period. PRVs that exceed this storage period of two years shall have the sealing element replaced and shall be assembled, set and tested in accordance with Clause 8 to ensure correct operation. PRVs that have been in storage for more than five years shall be recondi

38、tioned. Springs and seals on PRVs that have been in storage for more than five years shall not be reused. 6 Inspection PRVs shall be subjected to inspection for the following criteria to establish the suitability of the PRV or its components for reuse. Components which do not meet the following crit

39、eria and cannot be safely rectified shall be scrapped: stems that have drill holes in the potentially stressed area above the nut; bent or damaged stems; bent, deformed, corroded, badly marked, scored or cracked bodies; contaminants, foreign matter and corrosion; cross-threaded, damaged or stripped

40、PRV threads; indications of having been subjected to excessive heat or having been in a fire; foreign matter in visible internal passageways; or evidence of abuse or tampering. PRVs that are to be reconditioned shall also be checked for: damaged sealing surfaces and/or any non-metallic sealing eleme

41、nts; and non-standard parts. 7 Reconditioning Each PRV shall be dismantled into its component parts. Each component shall be inspected to ensure its suitability for reuse including meeting the manufacturers original specification. Threads shall be cleaned and checked for stripped threads, damage, di

42、stortion, cuts, cracks or corrosion. Threads shall be assessed by a competent person to determine if they can be rectified and reused. Taper threads where the full form thread gauge screws on by more than 1 turn over maximum shall be scrapped. Threads shall be checked using thread gauges. During rec

43、onditioning springs shall not be reused once removed from a PRV. BS EN 16631:2015EN 16631:2015 (E) 8 During reconditioning non-metallic materials shall not be reused in a PRV. Spare parts used in the reconditioning of PRVs shall be to the original manufacturers specification. For mobile applications

44、, PRVs shall be constructed with the stem guide permanently attached to the PRV body. This design shall be able to withstand a deceleration of 100 times gravity and shall remain leak tight and operate correctly afterwards. The reconditioned PRV shall be tested in accordance with Clause 8. 8 Pressure

45、 setting 8.1 General Setting and testing shall be carried out in accordance with the requirements of this standard by the PRV reconditioner, prior to any painting which may be required. The tests required below for all PRVs shall be conducted using air or nitrogen. The responsibility for the design

46、and safety of the pneumatic test rig rests with the reconditioner. The accuracy class for pressure measuring equipment used during the tests shall not be more than 0,6, see EN 837-1:1996, with the test pressure within the middle third of the instrument range. All Bourdon tube pressure gauges shall b

47、e calibrated in accordance with EN 837-1. PRVs undergoing pneumatic pressure testing shall not be subjected to any form of shock load. The hazards involved in pneumatic pressure testing shall be considered and appropriate precautions taken. All pipes, connections and blanking devices of the test ins

48、tallation shall be capable of withstanding at least twice the nominal set pressure of the PRV on test. 8.2 Setting and testing of PRVs 8.2.1 Only springs to the original PRV manufacturers specification shall be used. 8.2.2 Each PRV shall be individually set such that when air or nitrogen supply is c

49、onnected to the PRV inlet at a pressure equal to the nominal set pressure marked on the PRV, the first of a stream of bubbles appears through a water seal not more than 50 mm in depth applied on the outlet of the PRV. 8.2.3 All pressure relief PRVs shall be set to start to discharge at the nominal set pressure. 8.2.4 If at any time after manufacture and prior to use it is required to check the set pressure, then the first application of pressure shall allow the tolerance defined in 8.2.5 between the first start to discharge pressur