BS EN 14912-2015 LPG equipment and accessories Inspection and maintenance of LPG cylinder valves at time of periodic inspection of cylinders《液化石油气体(LPG)设备和附件 汽缸周期性检查时液化石油气体(LPG)汽缸阀.pdf

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1、BSI Standards PublicationBS EN 14912:2015LPG equipment and accessories Inspection and maintenanceof LPG cylinder valves attime of periodic inspection ofcylindersBS EN 14912:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 14912:2015. Itsupersedes BS EN 14912

2、:2005 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PVE/19, LPG containers and their associated fittings.A list of organizations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

3、the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI Standards Limited 2015ISBN 978 0 580 81792 2ICS 23.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Stan

4、dard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2015.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 14912:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14912 March 2015 ICS 23.060.40 Supersedes EN 14912:2005English Ver

5、sion LPG equipment and accessories - Inspection and maintenance of LPG cylinder valves at time of periodic inspection of cylindersquipements pour GPL et leurs accessoires - Contrle et entretien des robinets de bouteilles de GPL lors du contrle priodique des bouteilles Flssiggas-Gerte und Ausrstungst

6、eile - Inspektion und Wartung von Ventilen fr Flaschen fr Flssiggas (LPG) zum Zeitpunkt der wiederkehrenden Inspektion der Flaschen This European Standard was approved by CEN on 26 December 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions

7、 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 t

8、hree 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

9、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

10、, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES 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 wor

11、ldwide for CEN national Members. Ref. No. EN 14912:2015 EBS EN 14912:2015EN 14912:2015 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 General requirements 6 4.1 General 6 4.2 Cleaning 6 4.3 Personnel 6 4.4 Safety concerns .7 5 Inspectio

12、ns .7 5.1 General 7 5.2 External inspection 7 5.3 Additional inspection criteria .8 5.4 Pressure relief valves 8 5.4.1 General requirement 8 5.4.2 Individual test .8 5.4.3 Batch sampling test .9 5.5 Acceptance criteria 9 6 Maintenance .9 6.1 Minor repair 9 6.2 Refurbishment 9 6.2.1 General 9 6.2.2 V

13、alve inspection during refurbishment .9 6.2.3 Valve repair during refurbishment 10 7 Testing . 10 7.1 Refurbished valves . 10 7.2 All other valves . 10 8 Marking 10 Bibliography . 12 BS EN 14912:2015EN 14912:2015 (E) 3 Foreword This document (EN 14912:2015) has been prepared by Technical Committee C

14、EN/TC 286 “LPG Equipment and Accessories”, 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 September 2015, and conflicting national standards shall be wit

15、hdrawn at the latest by September 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 has been prepared under a mandat

16、e given to CEN by the European Commission and the European Free Trade Association. This document supersedes EN 14912:2005. The main changes between this version of this standard and the previous version are: alignment with the requirement of paragraph 12 of Packing Instruction P200 of ADR; introduct

17、ion of inspection and refurbishment requirements for pressure relief valves. It is recommended that users develop an environmental management policy. For guidance, see EN ISO 14000 series, see 1, 2 and 3. Users of this standard should consult FprCEN/TS 16765 4 while implementing its requirements. Th

18、is European Standard has been submitted for reference into the technical annexes of the ADR 5. NOTE These regulations take precedence over any clause of this European Standard. It is emphasized that ADR is regularly revised at intervals of two years, which may lead to temporary non-compliances with

19、the clauses of this European Standard. 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 Yugo

20、slav 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 14912:2015EN 14912:2015 (E) 4 Introduction

21、 This European Standard has been prepared to reflect the current methods for periodically inspecting LPG cylinder valves, and is based upon the operating experience of millions of cylinder years of service over a period of more than 50 years. The primary objective of the periodic inspection of trans

22、portable refillable LPG cylinder valves is that, at the completion of the tests, the cylinder valve can be re-introduced into service for a further period of time. The valve inspection is an integral part of the periodic inspection of an LPG cylinder. Periodic inspections/tests shall be carried out

23、by a competent person under the authorization of an inspection body based on a written scheme of examination. This European Standard calls for the use of substances and procedures that can be injurious to health if adequate precautions are not taken. It refers to technical suitability and does not a

24、bsolve the user from legal obligations relating to health and safety 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. Where judgements are called for, it has been assumed t

25、hat they are made by competent persons who have been trained specifically for the tasks. BS EN 14912:2015EN 14912:2015 (E) 5 1 Scope This European Standard specifies the requirements for inspection and maintenance of LPG cylinder valves, either manually operated or self-closing, for reuse. It applie

26、s when the valve is either inspected or refurbished at the time of periodic inspection of the cylinder. This European Standard may also be applied at any other time, for example, when maintenance of the valve is necessary. 2 Normative references The following documents, in whole or in part, are norm

27、atively 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 13953, LPG equipment and accessories Pressure relief valve

28、s for transportable refillable cylinders for Liquefied Petroleum Gas (LPG) EN ISO 14245, Gas cylinders Specifications and testing of LPG cylinder valves Self-closing (ISO 14245) EN ISO 15995, Gas cylinders Specifications and testing of LPG cylinder valves Manually operated (ISO 15995) ISO 2859-1, Sa

29、mpling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection 3 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

30、 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 periodic inspection activities carried out at defined interval

31、s, such as examining, measuring, testing or gauging the characteristics of a pressure vessel and comparing these with specified requirements 3.3 dismantling separation into component parts 3.4 minor repair operations that include cleaning and replacement of components accessible without any dismantl

32、ing of the valve (e.g. outlet seal, excess flow device) 3.5 refurbishment operation that includes complete dismantling of the valve, evaluation and replacement of internal components, and reassembly BS EN 14912:2015EN 14912:2015 (E) 6 3.6 competent person person which by combination of appropriate q

33、ualification, training, experience and resources, is able to make objective judgments on the subject 3.7 external leak tightness resistance to leakage through the fitting to or from the atmosphere when the valve/fitting is open 3.8 internal leak tightness resistance to leakage across the valve or fi

34、tting seat or other internal sealing components when the valve is closed 3.9 written scheme document, prepared by an inspection body, containing inspection information 3.10 self-closing valve normally closed valve that provides a leak tight seal, opens by the engagement of a special connector or by

35、fluid passing through it and closes automatically upon removal of the connector or by stopping the fluid flow 3.11 working pressure pressure under normal operating conditions 4 General requirements 4.1 General The valve shall be cleaned externally to facilitate inspection. The inspection shall deter

36、mine if: the valve is suitable for service; maintenance is required; or the valve shall be scrapped. 4.2 Cleaning Contaminants, foreign matter and corrosion products shall be removed from the valve to facilitate inspection, taking care not to damage any sealing surfaces. If any cleaning materials ar

37、e used, they shall be: completely removed after use; or suitable for and compatible with LPG and the materials of construction of the valve, the LPG cylinder and the associated downstream equipment. 4.3 Personnel Valves shall be inspected and maintained by a competent person. Where valve removal is

38、required, it shall only be removed from LPG cylinders by competent personnel, or under the responsibility of a competent person. BS EN 14912:2015EN 14912:2015 (E) 7 4.4 Safety concerns Prior to manually removing a valve, it shall be verified that the cylinder does not contain liquid and is not under

39、 pressure. An additional check shall be made to ensure that the valve is not obstructed or blocked. Cylinders that contained liquid shall be emptied and depressurized in a safe and controlled manner. Cylinders with inoperative or blocked valves shall be set aside for safe valve removal. To confirm i

40、f an LPG cylinder contains residual liquid LPG, when its valve is suspected to be inoperative or blocked, it can be weighed and this weight compared to the tare mass. Valves shall only be removed from and refitted safely to a pressurized LPG cylinder provided the facility includes suitable equipment

41、. External inspection and minor repairs may be carried out on valves while they are connected to a pressurized LPG cylinder, e.g. at time of filing, but this may require special procedures and equipment. Refurbishment shall only be performed on valves that have been removed. 5 Inspections 5.1 Genera

42、l All valves shall be inspected in accordance with 5.2. If the valves have been removed from the cylinders, additional inspections shall be performed in accordance with 5.3. Valves fitted with dip-tubes, eduction tubes, sediment tubes, inlet filters, level indicating devices or overfill protection d

43、evices shall be removed from the cylinders. Valves with excess flow devices fitted onto the stems of manually operated valves shall also be removed from the cylinders unless the correct operation of the flow devices is checked after each filling. Valves fitted with pressure relief valves shall also

44、be tested in accordance with 5.4. 5.2 External inspection All valves shall be externally inspected for: a) spindles that do not move smoothly, are difficult to turn or are seized; b) bent, deformed, corroded, scored or cracked bodies; c) bent or damaged spindles; d) cross-threaded, damaged or stripp

45、ed valve outlet connections; e) damaged outlet sealing surfaces and/or any non-metallic sealing elements; f) indications of having been subjected to excessive heat or having been in a fire; g) foreign matter in visible internal passageways; h) evidence of abuse or tampering; i) evidence of damaged g

46、auges or indicators; BS EN 14912:2015EN 14912:2015 (E) 8 j) damage to hand wheels; k) damage to pressure relief valves; and l) missing parts. For acceptance criteria, see 5.5. 5.3 Additional inspection criteria Valves removed from cylinders shall be inspected for: a) contaminants, foreign matter and

47、 corrosion products; b) cross-threaded, damaged or stripped valve stem threads; c) damaged dip tubes, eduction tubes, sediment tubes and their retaining threads; d) damaged inlet filters; e) damaged liquid level and pressure indicating devices; f) damaged overfill protection devices; g) damaged exce

48、ss flow devices; and h) missing parts. For acceptance criteria, see 5.5. 5.4 Pressure relief valves 5.4.1 General requirement A pressure relief valve shall be tested according to 5.4.2. If the periodic inspection interval of the cylinder is less than 15 years, then the pressure relief valve may be t

49、ested using the batch test described in 5.4.3. This batch testing is only allowed for valve batches that are less than 15 years old otherwise, the method described in 5.4.2 shall be used. 5.4.2 Individual test The start to discharge pressure shall be determined from the following procedure: apply a pneumatic pressure to lift the pressure relief valve sealing element off the seat to ensure that it is not sticking; depressurize to allow the pressure relief valve to close; apply a pneumatic pressure to lift the pressure relief valve