1、BRITISH STANDARDBS EN ISO 11621:2005Gas cylinders Procedures for change of gas serviceThe European Standard EN ISO 11621:2005 has the status of a British StandardICS 23.020.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3
2、g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 11621:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 20 January 2006 BSI 20 January 2006ISBN 0 580 47435 6National forewordThis British Standard is the
3、official English language version of EN ISO 11621:2005. It is identical with ISO 11621:1997. It supersedes BS EN 1795:1998 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee PVE/3, Gas containers, to Subcommittee PVE/3/7, Gas cylinder operations, which ha
4、s the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section
5、entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compli
6、ance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related inte
7、rnational and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii and iii, a blank page, pages 1 to 13 and a back cover.The BSI copyright notice
8、 displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 11621October 2005ICS 23.020.30 Supersedes EN 1795:1997 English VersionGas cylinders - Procedures for change of gas se
9、rvice (ISO11621:1997)Bouteilles gaz - Mode opratoire pour le changement deservice de gaz (ISO 11621:1997)Gasflaschen - Verfahren fr den Wechsel der Gasart (ISO11621:1997)This European Standard was approved by CEN on 22 September 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regu
10、lations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This Euro
11、pean Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the nationa
12、l standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN
13、COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 11621:2005: EForeword The text o
14、f ISO 11621:1997 has been prepared by Technical Committee ISO/TC 58 “Gas cylinders” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 11621:2005 by Technical Committee CEN/TC 23 “Transportable gas cylinders” the secretariat of which is held by BSI. This Eu
15、ropean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2006, and conflicting national standards shall be withdrawn at the latest by April 2006. This document supersedes EN 1795:1997. According to the CEN/
16、CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg,
17、Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 11621:1997 has been approved by CEN as EN ISO 11621:2005 without any modifications. NOTE Normative references to International Standards are listed in a
18、nnex ZA (normative). EN ISO 11621:2005INTERNATIONAL STANDARD IS0 11621 First edition 1997-04-I 5 Gas cylinders - Procedures for change of gas service Bouteilles 2 gaz - Mode opkatoire pour le changement de service de gaz Reference number IS0 11621:1997(E) EN ISO 11621:2005Foreword IS0 (the Internati
19、onal Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been
20、 established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standa
21、rdization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 11621 was prepared by Technical Com
22、mittee ISO/TC 58, Gas cylinders, Subcommittee SC 4, Operational requirements for gas cylinders. Annex A of this International Standard is for information only. 0 IS0 1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any
23、means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 l CH-1211 Geneve 20 l Switzerland Internet central iso.ch x.400 c=ch; a=400net; p=iso; o=isocs; s=central Printed in
24、 Switzerland IS0 11621:1997(E) Introduction It is occasionally desirable to change gas cylinders from one gas service to another. Certain of these service changes can be made quite easily, while others require a careful inspection of the interior and exterior of the cylinder to detect the presence o
25、f corrosion products or contaminants, which must be removed for safety reasons or to avoid undesirable contamination of the contained gas. This International Standard has been prepared to assist those engaged in the filling of gas cylinders for changing cylinders from one gas service to another. EN
26、ISO 11621:2005blankGas cylinders - Procedures for change of gas service 1 Scope This International Standard applies to seamless steel, aluminium alloy and welded steel refillable cylinders of all sizes, including large cylinders (water capacity greater than 150 I). It provides general requirements a
27、nd procedures to be considered whenever a cylinder is being transferred from one gas service to another for permanent and liquefied gases. It does not apply to cylinders for dissolved acetylene, radioactive gases or gases listed in group G of table I. 2 Normative references The following standards c
28、ontain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to invest
29、igate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 5145:1990, Cylinder valve outlets for gases and gas mixtures - Selection and dimensioning. IS0 6406: 1992, Periodic i
30、nspection and testing of seamless steel gas cylinders, IS0 10156:1996, Gases and gas mixtures - Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets. IS0 10460:1993, Welded carbon steel gas cylinders - Periodic inspection and testing, IS0 10461: 1993, Sea
31、mless aluminium-alloy gas cylinders - Periodic inspection and testing. Isolll14-1: -1), Compatibility of cylinder and valve materials with gas contents - Part 1: Metallic materials. 1) To be published. EN ISO 11621:20053 Abbreviations NDT = Non-destructive testing. SCT = Stress corrosion testing. 4
32、General requirements Cylinders are manufactured in accordance with international and/or national standards and are intended for use with a variety of gases under specified filling conditions. Although some cylinders are restricted to specific gas services, the majority of cylinders can be transferre
33、d from one gas service to another, provided applicable regulations are observed and appropriate procedures are followed and material compatibilities are considered (see IS0 11114-l). Cylinders which have been in service may have been exposed to conditions that render them unsafe during, or when tran
34、sferred to, a different gas service. These conditions could result in contamination, corrosion or residual gases that may react. Therefore, it is essential that all procedures detailed in clause 5 and displayed in tables 1, 2 and 3 be carefully followed. Particular attention shall be directed to ass
35、uring that purging or cleaning procedures, where specified, remove all residual gas, contaminants or corrosion products and that cleaning agents are removed and cylinders dried and sealed to prevent entry of dirt or moisture after cleaning. Persons using this International Standard shall be knowledg
36、eable in the handling of compressed gases and be familiar with the chemical and physical properties of the commodities which they charge into cylinders and of the contaminants which are likely to be found therein. 4.1 Grouping of gases For the purposes of this International Standard, the gases for w
37、hich cylinder transfers are most frequently desired have been separated into several groups. This separation has taken into consideration the chemical and physical reactivity of the gases and of the contaminants which are most frequently encountered. The requirements in this International Standard m
38、ay not be applicable to gases or mixtures which are not included in the gas groups given in table 3. Recommendations for the cleaning of cylinders which have contained such gases shall be obtained from the manufacturer of the cylinder and/or gas. The values quoted in table 1 for the FTSC code are ta
39、ken from IS0 5145 or IS0 10156. 4.2 Gases which may affect cylinder condition Cylinders which have been in certain gas services may be subjected to conditions which could affect the future serviceability of the cylinder or render it unsuitable for use in any other gas service. Cylinders in such serv
40、ices are subject to rigid requalification procedures or may be prohibited from use in other gas services. Examples are: steel cylinders in carbon monoxide/carbon monoxide mixture service which may be subject to stress corrosion cracking; steel cylinders which have been in hydrogen service but which
41、were not designed and manufactured for this gas (see IS0 11114-1). 5 Actions for change of service 5.1 General Because of the potential safety problems (e.g. corrosion, contamin ation, compatibility), specific actions are required when transferring a cylinder from one gas service to another. The ste
42、ps (set of actions), denoted by a number, are 2 EN ISO 11621:2005IS0 11621 :1997(E) listed in table 3. Table 2 shows in tabular form all the steps to be taken for each transfer. It is important that each step be taken. The gas groups are shown by name and letter in table 1. The actions given in tabl
43、e 3 are described in detail in 53.1 to 53.10 inclusive. 5.2 Use of tables 1,2 and 3 EXAMPLE d A nitrogen cylinder is to be transferred to hydrogen service. Determine the gas groups from table 1 (nitrogen = A; hydrogen = E). Using table 2, find A in the left-hand column and proceed across the table t
44、o column E where you will find the numbers 1, 4, 6. Go to table 3, which shows what actions are required by steps 1, 4 and 6 (for details, see 53.1, 5.3.4 and 5.3.6). EXAMPLE 2 An oxygen cylinder is to be transferred to 50 % oxygen and 50 % nitrous oxide. Determine the gas groups from table 1 (oxyge
45、n and nitrous oxide = C). Using table 2, find C in the left-hand column and proceed ,across the table to column C where you will find the number 1. Go to table 3, which shows what actions are required by step 1 (for details, see 5.3.1). Table ll - Gas groups for change of service Group I Description
46、 I Gases A Inertl) Nitrogen, argon, helium, neon, krypton, xenon and all gases and gas mixtures having FTSC code 01X*)0 (but excluding gases in group B). B Inert/activea) Carbon dioxide, carbon dioxide mixtures and oxygen mixtures containing less than 21 % oxygen having FTSC code 01X0 or 11X0. C Oxi
47、dizing Oxygen, nitrous oxide, air and mixtures containing at least 21 % oxygen or more than 60 % nitrous oxide having FTSC code 41 X0. D Flammable Ethylene, methane, cyclopropane, other hydrocarbons, liquefied petroleum gases, etc., and all gases and gas mixtures having FTSC code 21X0 (but excluding
48、 flammable gases of groups E and F). E Embrittling Hydrogen and all non-toxic gases of group 2 of IS0 11114-1 having FTSC code 21 x0. F I SC) I Carbon monoxide and carbon monoxide mixtures. G Toxic Corrosive Pyrophoric Very toxic (X3Xx), toxic (X2Xx), corrosive (XXXYS) and pyrophoric (3XxX) gases (b
49、ut excluding group F). CAUTION - Some of these gases are also embrittling (see IS0 11114-I). 1) inert in terms of fire potential (see IS0 10156). 2) X equals any digit. 3) Inert in terms of fire potential, but corrosive in presence of moisture. 4) Stress corrosion cracking. 5) YZO 3 EN ISO 11621:2005 IS0 Table 2 - Actions to be taken when transferring cylinders from one gas service to another From Jf To + A B C D E F G Inert Inert/active Oxidizing Carbon Flammable Embrittling monoxide Toxic, etc. A Inert 1 I, 2 I, 3 1 IA6 195 I, 4 3 B Inert/active I, 7 1 I, 3 197 19
