1、Cryogenic vessels Cleanliness for cryogenic serviceBS ISO 23208:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Cryogenic vessels Cleanliness for cryogenic serviceRcipients cryogniques Propret en service cryogniqueINTERNATIONALSTANDARDISO23208Second edit
2、ion2017-04Reference numberISO 23208:2017(E)National forewordThis British Standard is the UK implementation of ISO 23208:2017.The UK participation in its preparation was entrusted to Technical Committee PVE/18, Cryogenic vessels.A list of organizations represented on this committee can be obtained on
3、 request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 91622 9ICS 23.020.40Compliance with a Bri
4、tish Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 23208:2017 ISO 2017Cryogenic vesse
5、ls Cleanliness for cryogenic serviceRcipients cryogniques Propret en service cryogniqueINTERNATIONAL STANDARDISO23208Second edition2017-04Reference numberISO 23208:2017(E)BS ISO 23208:2017ISO 23208:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandA
6、ll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested
7、from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 23208:2017ISO 23208:2017(E)ii ISO 2017 All rights rese
8、rvedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intr
9、anet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.
10、iso.orgISO 23208:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Requirements 14.1 General requirements . 14.2 Additional requirements for oxygen and oxidizing fluids . 25 Cleaning procedure 26 Cleanliness evaluation 27 Post-cleaning protection 28 Identification 3An
11、nex A (informative) Inspection methods 4Bibliography 7 ISO 2017 All rights reserved iiiContents PageBS ISO 23208:2017ISO 23208:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Int
12、ernational 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. International organizations, governmental and non-governmental, in liaison w
13、ith ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directive
14、s, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some
15、 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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarat
16、ions received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity as
17、sessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 220, Cryogenic vessels.This second editio
18、n cancels and replaces the first edition (ISO 23208:2005), which has been technically revised. The main changes are in 4.1.iv ISO 2017 All rights reservedBS ISO 23208:2017ISO 23208:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards
19、 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. International organiza
20、tions, 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.The procedures used to develop this document and those intended for its furt
21、her maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ direc
22、tives).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. Details of any patent rights identified during the development of the document will be in the
23、Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO s
24、pecific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Comm
25、ittee ISO/TC 220, Cryogenic vessels.This second edition cancels and replaces the first edition (ISO 23208:2005), which has been technically revised. The main changes are in 4.1.iv ISO 2017 All rights reserved INTERNATIONAL STANDARD ISO 23208:2017(E)Cryogenic vessels Cleanliness for cryogenic service
26、1 ScopeThis document specifies the minimum requirements for the cleanliness of all surfaces of cryogenic vessels and associated accessories that are in contact with the cryogenic fluid at any expected operating conditions.This document defines the acceptable level of surface and particle contaminati
27、on to minimize the risk of malfunction of equipment and ensure safety against ignition when in contact with oxygen or oxidizing fluids (see ISO 10156).2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of
28、 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 21010, Cryogenic vessels Gas/materials compatibility3 Terms and definitionsFor the purposes of this document, the followi
29、ng terms and definitions apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1cryogenic fluidgas which is
30、 partially liquid because of its low temperatureNote 1 to entry: It includes totally evaporated liquids and supercritical fluids.Note 2 to entry: In the context of this document, refrigerated but non-toxic gases and mixtures of them are referred to as cryogenic fluids.Note 3 to entry: See also ISO 2
31、1029-1, ISO 20421-1 and/or ISO 21009-1.3.2oxidizing fluidcryogenic fluid (3.1) with oxidizing propertiesNote 1 to entry: This is in accordance with ISO 10156.4 Requirements4.1 General requirementsForeign matter such as chips, oxide scale and weld spatter are not acceptable. ISO 2017 All rights reser
32、ved 1BS ISO 23208:2017ISO 23208:2017(E)Particles visible under daylight or white light without magnification are not acceptable. Depending upon the design of the system, more stringent requirements for particle size may be required to avoid malfunction of equipment.The root pass of pipe welds shall
33、be protected by forming gas, or another suitable method, to avoid gross porosity.Free water shall not be detectable by visual examination.4.2 Additional requirements for oxygen and oxidizing fluidsFor oxygen and oxidizing fluids, hydrocarbon contamination, paint, adhesives, sealants and protective c
34、oating shall not be detectable by visual examination using white light unless they are oxygen compatible in accordance with ISO 21010.The maximum acceptable hydrocarbon contamination (oil, grease, etc.) is 500 mg/m2.NOTE The value 500 mg/m2is taken from CGA G-4.15. The quoted figure should be consid
35、ered as guidance only. A lower figure could be requested depending on the specific application (type and state of fluid, temperature, pressure, flow, velocity, product purity), or effects like migration (see also EIGA Doc 33/06 7).5 Cleaning procedureAny cleaning procedure may be used, provided the
36、requirements of 4.1 and 4.2, if relevant, are met. If solvent or cleaning agents are used, they shall be compatible with all materials to be cleaned, in particular, plastics. Special care shall be taken to remove any non-oxygen-compatible agents (see ISO 21010) from equipment cleaned for oxygen or o
37、xidizing fluid service.6 Cleanliness evaluationAn inspection and sampling method shall be selected to ensure that the requirements of 4.1 and 4.2, if relevant, are met. It shall take into account the cleaning procedure to be used, the equipment to be cleaned and its level of contamination. Cleanline
38、ss evaluation methods may include those listed in Annex A.The method of inspection shall not itself result in contamination levels greater than those specified in 4.1 and 4.2.The cleanliness evaluation method shall be documented and the results obtained shall be recorded.7 Post-cleaning protectionAf
39、ter cleaning, items shall be protected to maintain their clean condition until used. To reduce the risk of condensing any atmospheric moisture during storage, consideration shall be given to purging and sealing the equipment.Any packaging, plugs, etc. that can contact the clean surfaces shall be cle
40、an and removable without leaving any residue. Any packaging material shall be strong enough to resist the expected handling and storage conditions and be able to be sealed and waterproof.Any protective gas used shall be dry and oil-free and dust-free.Any pressurizing gas shall be kept at low pressur
41、e compatible with the strength of the packaging and have a warning tag if purge pressures exceed 0,5 bar.2 ISO 2017 All rights reservedBS ISO 23208:2017ISO 23208:2017(E)Particles visible under daylight or white light without magnification are not acceptable. Depending upon the design of the system,
42、more stringent requirements for particle size may be required to avoid malfunction of equipment.The root pass of pipe welds shall be protected by forming gas, or another suitable method, to avoid gross porosity.Free water shall not be detectable by visual examination.4.2 Additional requirements for
43、oxygen and oxidizing fluidsFor oxygen and oxidizing fluids, hydrocarbon contamination, paint, adhesives, sealants and protective coating shall not be detectable by visual examination using white light unless they are oxygen compatible in accordance with ISO 21010.The maximum acceptable hydrocarbon c
44、ontamination (oil, grease, etc.) is 500 mg/m2.NOTE The value 500 mg/m2is taken from CGA G-4.15. The quoted figure should be considered as guidance only. A lower figure could be requested depending on the specific application (type and state of fluid, temperature, pressure, flow, velocity, product pu
45、rity), or effects like migration (see also EIGA Doc 33/06 7).5 Cleaning procedureAny cleaning procedure may be used, provided the requirements of 4.1 and 4.2, if relevant, are met. If solvent or cleaning agents are used, they shall be compatible with all materials to be cleaned, in particular, plast
46、ics. Special care shall be taken to remove any non-oxygen-compatible agents (see ISO 21010) from equipment cleaned for oxygen or oxidizing fluid service.6 Cleanliness evaluationAn inspection and sampling method shall be selected to ensure that the requirements of 4.1 and 4.2, if relevant, are met. I
47、t shall take into account the cleaning procedure to be used, the equipment to be cleaned and its level of contamination. Cleanliness evaluation methods may include those listed in Annex A.The method of inspection shall not itself result in contamination levels greater than those specified in 4.1 and
48、 4.2.The cleanliness evaluation method shall be documented and the results obtained shall be recorded.7 Post-cleaning protectionAfter cleaning, items shall be protected to maintain their clean condition until used. To reduce the risk of condensing any atmospheric moisture during storage, considerati
49、on shall be given to purging and sealing the equipment.Any packaging, plugs, etc. that can contact the clean surfaces shall be clean and removable without leaving any residue. Any packaging material shall be strong enough to resist the expected handling and storage conditions and be able to be sealed and waterproof.Any protective gas used shall be dry and oil-free and dust-free.Any pressurizing gas shall be kept at low pressure compatible with the strength of the packaging and have a warning tag if purge pressures ex
