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1、BS ISO 22434:2006 ICS 23.020.30; 23.060.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Transportable gas cylinders Inspection and maintenance of cylinder valves Licensed CopyChinese University of Hong Kong, 11/04/2009 08:49, Uncontrolled Copy, (c) BSI This
2、 British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2009 BSI 2009 ISBN 978 0 580 55225 0 Amendments/corrigenda issued since publication DateComments BS ISO 22434:2006 National foreword This British Standard is the UK implementation of ISO
3、 22434:2006. The UK participation in its preparation was entrusted to Technical Committee PVE/3/1, Valve fittings for gas containers. 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 prov
4、isions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed CopyChinese University of Hong Kong, 11/04/2009 08:49, Uncontrolled Copy, (c) BSI BS ISO 22434:2006 Reference number ISO 22434:2006(E) I
5、SO 2006 INTERNATIONAL STANDARD ISO 22434 First edition 2006-09-01 Transportable gas cylinders Inspection and maintenance of cylinder valves Bouteilles gaz transportables Contrle et maintenance des robinets de bouteilles Licensed CopyChinese University of Hong Kong, 11/04/2009 08:49, Uncontrolled Cop
6、y, (c) BSI BS ISO 22434:2006 ISO 22434:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer per
7、forming the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this
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9、 Secretariat at the address given below. ISO 2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at t
10、he address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reserved Licensed CopyChinese University o
11、f Hong Kong, 11/04/2009 08:49, Uncontrolled Copy, (c) BSI BS ISO 22434:2006 ISO 22434:2006(E) ISO 2006 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 2 4 General requirements. 2 5 Inspection and maintenance . 3 6 Testing . 5 7 Marking
12、 5 8 Packaging 6 9 Scrapping 6 Bibliography. 7 Licensed CopyChinese University of Hong Kong, 11/04/2009 08:49, Uncontrolled Copy, (c) BSI BS ISO 22434:2006 ISO 22434:2006(E) iv ISO 2006 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of
13、 national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Int
14、ernational organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with t
15、he rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval
16、by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 22434 was prepared by Technical Committee I
17、SO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder fittings. Licensed CopyChinese University of Hong Kong, 11/04/2009 08:49, Uncontrolled Copy, (c) BSI BS ISO 22434:2006 INTERNATIONAL STANDARD ISO 22434:2006(E) ISO 2006 All rights reserved 1 Transportable gas cylinders Inspection and maintenance o
18、f cylinder valves 1 Scope This International Standard specifies the requirements for the inspection and maintenance of cylinder valves, including valves with integrated pressure regulators (VIPR) (see ISO 22435). This International Standard may be applied to cylinder valves at the time of the period
19、ic inspection of gas cylinders, bundles, drums and trailers, and at any other time, e.g. at change of gas service (see ISO 11621). It does not apply to routine inspection of cylinder valves carried out at the time of cylinder filling. NOTE National standards and regulations may apply to maintenance
20、of cylinder valves. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 64
21、06:2005, Gas cylinders Seamless steel gas cylinders Periodic inspection and testing ISO 10156, Gases and gas mixtures Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets ISO 10297, Transportable gas cylinders Cylinder valves Specification and type testin
22、g ISO 10463, Cylinders for permanent gases Inspection at time of filling ISO 10691, Gas cylinders Refillable welded steel cylinders for Liquified Petroleum Gas (LPG) Procedures for checking before, during and after filling ISO 11113, Cylinders for liquefied gases (excluding acetylene and LPG) Inspec
23、tion at time of filling ISO 11372, Gas cylinders Cylinders for dissolved acetylene Inspection at time of filling ISO 11755, Gas cylinders Cylinder bundles for compressed and liquefied gases (excluding acetylene) Inspection at time of filling ISO 13341, Transportable gas cylinders Fitting of valves t
24、o gas cylinders ISO 14245, Gas cylinders Specifications and testing of LPG cylinder valves Self-closing ISO 14246, Transportable gas cylinders Gas cylinder valves Manufacturing tests and inspection ISO 15001, Anaesthetic and respiratory equipment Compatibility with oxygen ISO 15995, Gas cylinders Sp
25、ecifications and testing of LPG cylinder valves Manually operated ISO 22435, Gas cylinders Cylinder valves with integrated pressure regulator Specification and type testing Licensed CopyChinese University of Hong Kong, 11/04/2009 08:49, Uncontrolled Copy, (c) BSI BS ISO 22434:2006 ISO 22434:2006(E)
26、2 ISO 2006 All rights reserved 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 inspection procedure to determine if a cylinder valve is suitable for further service 3.2 dismantling separation of the cylinder valve into its component parts, su
27、ch that the main pressure barrier of the valve is breached 3.3 removal disconnection of the cylinder valve from the gas cylinder 3.4 maintenance operations required to keep the cylinder valve in working condition NOTE This covers minor repairs, major repairs and refurbishment. 3.4.1 minor repair ope
28、ration including cleaning, and replacement of non-pressure-retaining components, e.g. handwheel, outlet flow restrictor, residual pressure device fitted in the valve outlet 3.4.2 major repair operation including replacement of valve accessories which are incorporated within the pressure boundary, bu
29、t do not require dismantling of the cylinder valve, e.g. pressure relief device (PRD), pressure gauges, flowmeter 3.4.3 refurbishment operation involving dismantling of the cylinder valve, evaluation of its internal components, and reassembly to make it suitable for further service 4 General require
30、ments 4.1 Occurrence If a cylinder valve is deemed to require maintenance at any time, e.g. at time of periodic test of the gas cylinder, it shall either be scrapped, or be subject to the procedures given below. 4.2 Personnel Cylinder valves shall be inspected, maintained and removed from gas cylind
31、ers by competent personnel only. 4.3 Safety concerns Prior to removing the cylinder valve from a gas cylinder it shall be verified that no pressure remains in the cylinder. See ISO 6406:2005, Annex D. NOTE Special techniques and equipment exist in some industries, e.g. LPG, for removing valves safel
32、y from cylinders under pressure. Licensed CopyChinese University of Hong Kong, 11/04/2009 08:49, Uncontrolled Copy, (c) BSI BS ISO 22434:2006 ISO 22434:2006(E) ISO 2006 All rights reserved 3 Inspection and minor repairs may be carried out on cylinder valves while they are connected to a pressurized
33、gas cylinder, but this requires special procedures. Major repairs and refurbishment shall only be performed on a cylinder valve in a de-pressurized cylinder or on a removed valve. 5 Inspection and maintenance Inspection will determine if a cylinder valve is suitable for continued service or if maint
34、enance is required, and the level of that maintenance. 5.1 Inspection Inspection of cylinder valves comprises external examination preceded by cleaning, where necessary. 5.1.1 Cleaning The cylinder valve shall be clean externally to facilitate inspection. a) Contamination, foreign bodies and corrosi
35、on products shall be removed from the valve outlet taking care not to damage any sealing surfaces. b) If any cleaning media are used, they are to be suitable for the intended gas service (e.g. medical), the materials of construction of the cylinder valve, the gas cylinder and the associated downstre
36、am equipment. Cleaning media shall be completely removed. 5.1.2 External examination valve remaining in the gas cylinder Cylinder valves shall be examined for defects including the following: a) the spindle does not move smoothly or is difficult to turn; b) bent, deformed, corroded, badly marked and
37、 scored bodies or those with cracks; c) bent or damaged spindles; d) cross-threaded, damaged, worn, corroded or stripped valve outlet and filling connections; e) damaged, corroded or worn outlet sealing surfaces and/or any non-metallic sealing element; f) any indication of having been subjected to e
38、xcessive heat or having been in a fire; g) foreign matter obstructing or blocking ports; h) distorted wrenching flats on key operated valves; i) evidence of abuse or tampering; j) evidence of damaged gauges; k) damage to handwheels; l) missing or damaged residual pressure valve unit; m) incorrect ra
39、ting of pressure relief device; n) inappropriate valve for the gas service; o) contamination or suspect improper lubrication or sealant at the valve to cylinder interface; p) loose gland nuts. Licensed CopyChinese University of Hong Kong, 11/04/2009 08:49, Uncontrolled Copy, (c) BSI BS ISO 22434:200
40、6 ISO 22434:2006(E) 4 ISO 2006 All rights reserved 5.1.3 Additional external examination Valve removed from gas cylinder In addition to the above requirements, if the cylinder valve has been removed from the gas cylinder, it shall be visually examined for the following additional defects after all r
41、esidual jointing compound has been removed from the valve stem thread: a) contamination, foreign bodies and corrosion products in the valve stem bore; b) cross-threaded, damaged, worn, deformed or stripped valve stem threads; c) damaged dip tube, eductor tube or retaining threads; d) damaged inlet f
42、ilter; e) damaged liquid or pressure level indicating device; f) damaged overfill prevention device; g) damaged excess flow prevention device. 5.1.4 Acceptance criteria Cylinder valves not exhibiting defects listed in 5.1.2 (and 5.1.3 if applicable) may re-enter service. Cylinder valves with any of
43、the defects listed above shall either be subject to maintenance in accordance with 5.2, or scrapped in accordance with Clause 9. 5.2 Maintenance 5.2.1 Minor repairs Hand wheels and other non-pressure retaining parts shall be assessed for reuse, repair or replacement as appropriate. 5.2.2 Major repai
44、rs If required, gland nuts shall be re-torqued to the original manufacturing value and using the recommended procedures. For cylinder valves equipped with pressure relief devices (PRD), if the PRD is to be replaced, it shall be replaced by items to the manufacturers original specification and in acc
45、ordance with their instructions. Other accessories requiring replacement are to meet the original valve manufacturers specification and are to be replaced according to their instructions. 5.2.3 Refurbishment 5.2.3.1 General Cylinder valves may only be refurbished if they are designed to be dismantle
46、d and reassembled. Refurbishment shall be carried out after decontamination, as appropriate. Where replacement parts are used, they shall be in accordance with the cylinder valve manufacturers specification for the intended gas service. Cylinder valves shall be dismantled in accordance with the orig
47、inal manufacturers specifications, using appropriate tools and in a work area specially set aside for this activity. Licensed CopyChinese University of Hong Kong, 11/04/2009 08:49, Uncontrolled Copy, (c) BSI BS ISO 22434:2006 ISO 22434:2006(E) ISO 2006 All rights reserved 5 5.2.3.2 Component examina
48、tion and evaluation The stem thread of each valve body shall be visually examined to assess whether it has been subjected to excessive damage, deformation or wear. The outlet connection(s) of each valve body shall be visually examined to confirm freedom from corrosion, damage, or excessive wear. Int
49、ernal passageways shall be examined to ensure that they are free of foreign matter. The valve outlet sealing face shall be examined for damage, wear and corrosion. Any outlet non-metallic sealing element shall be replaced by a new one in accordance with the valve manufacturers specification. If the design of the valve allows, any of the above defects may be corrected, provided the dimensions remain within the original design standard, otherwise the cylinder valve shall be scrapped in