1、BSI Standards PublicationBS EN ISO 24490:2016Cryogenic vessels Pumps forcryogenic serviceBS EN ISO 24490:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 24490:2016. It supersedes BS EN 13275:2000 which is withdrawn. The UK participation in its preparati
2、on was entrusted to Technical Committee PVE/18, Cryogenic vessels.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 provisions of a contract. Users are responsible for its correct applicati
3、on. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 87480 2 ICS 23.020.40; 23.080 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy
4、 Committee on 30 April 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 24490 April 2016 ICS 23.020.40 Supersedes EN 13275:2000English Version Cryogenic vessels - Pumps for cryogenic service (ISO 24490:2016) Rcipi
5、ents cryogniques - Pompes pour service cryognique (ISO 24490:2016) Kryo-Behlter - Pumpen fr den Kryo-Betrieb (ISO 24490:2016) This European Standard was approved by CEN on 15 March 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givi
6、ng 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 three offi
7、cial 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 bodies of
8、 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, Spain,
9、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 2016 CEN All rights of exploitation in any form and by any means reserved worldwide fo
10、r CEN national Members. Ref. No. EN ISO 24490:2016 EBS EN ISO 24490:2016EN ISO 24490:2016 (E) 3 European foreword This document (EN ISO 24490:2016) has been prepared by Technical Committee ISO/TC 220 “Cryogenic vessels” in collaboration with Technical Committee CEN/TC 268 “Cryogenic vessels and spec
11、ific hydrogen technologies applications” the secretariat of which is held by AFNOR. 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 October 2016, and conflicting national standards shall be withdr
12、awn at the latest by October 2016. 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 supersedes EN 13275:2000. This docume
13、nt has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bu
14、lgaria, 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, Switzerland,
15、Turkey and the United Kingdom. Endorsement notice The text of ISO 24490:2016 has been approved by CEN as EN ISO 24490:2016 without any modification. BS EN ISO 24490:2016ISO 24490:2016(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Requirements for pumps . 24.1 General .
16、 24.2 Materials . 24.2.1 General 24.2.2 Mechanical properties at low temperature 24.2.3 Corrosion resistance . 34.2.4 Oxygen and oxidizing fluids compatibility 34.2.5 Hydrogen compatibility . 44.3 Design . 44.3.1 Pressure-containing parts . 44.3.2 Performance 44.3.3 Clearances 44.3.4 Prevention of r
17、ubbing 44.3.5 Fastenings 44.3.6 Warm bearings 44.3.7 Cold bearings 44.3.8 Bearing lubrication 54.3.9 Shaft seals 54.3.10 Purging . 54.3.11 Prevention of particle contamination 54.3.12 Specific requirement for flammable liquids . 54.3.13 Protection against over-pressurization . 64.3.14 Pump motors .
18、65 Test procedures . 65.1 Prototype testing . 65.1.1 General 65.1.2 Design evaluation 65.1.3 Performance evaluation. 65.1.4 Initial tests . 65.1.5 Cryogenic tests. 75.2 Production testing 75.2.1 General 75.2.2 Hydrostatic pressure test . 75.2.3 Mechanical running and performance test . 86 Cleanlines
19、s 87 Marking 8Annex A (informative) Guidance on installation design 9Annex B (informative) Acceptable materials for construction of centrifugal pumps for liquid oxygen .11Bibliography .15 ISO 2016 All rights reserved iiiContents PageBS EN ISO 24490:2016ISO 24490:2016(E)ForewordISO (the International
20、 Organization for Standardization) is a worldwide federation of 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 est
21、ablished 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. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardiz
22、ation.The procedures used to develop this document and those intended for its further 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 wi
23、th the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). 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
24、 patent rights identified during the development of the document will be in the 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
25、.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible f
26、or this document is ISO/TC 220, Cryogenic vessels.This second edition cancels and replaces the first edition (ISO 24490:2005), which has been technically revised.iv ISO 2016 All rights reservedBS EN ISO 24490:2016INTERNATIONAL STANDARD ISO 24490:2016(E)Cryogenic vessels Pumps for cryogenic service1
27、ScopeThis International Standard specifies the minimum requirements for the design, manufacture and testing of pumps for cryogenic service.This International Standard is applicable to centrifugal pumps. However, it can be applied to other types of cryogenic pumps (e.g. reciprocating pumps), where ap
28、plicable.This International Standard also gives guidance on the design of installations (see Annex A).It does not specify requirements for operation or maintenance.NOTE For cryogenic fluids, see ISO 21029-1, ISO 20421-1 and/or ISO 21009-1.2 Normative referencesThe following documents, in whole or in
29、 part, are normatively 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.ISO 5198, Centrifugal, mixed flow and axial pum
30、ps Code for hydraulic performance tests Precision gradeISO 21010, Cryogenic vessels Gas/materials compatibilityISO 21028-1, Cryogenic vessels Toughness requirements for materials at cryogenic temperature Part 1: Temperatures below 80 CISO 21028-2, Cryogenic vessels Toughness requirements for materia
31、ls at cryogenic temperature Part 2: Temperatures between 80 C and 20 CISO 23208, Cryogenic vessels Cleanliness for cryogenic service3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1nominal sizeDNalphanumeric designation of size for components of
32、a pipework system, which is used for reference purposesNote 1 to entry: It comprises the letters DN followed by a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections.Note 2 to entry: The number following
33、the letters DN does not represent a measurable value and is not to be used for calculation purposes except where specified in the relevant standard.Note 3 to entry: In those standards which use the DN designation system, any relationship between DN and component dimensions is given, e.g. DN/OD or DN
34、/ID.SOURCE: ISO 6708:1995, 2.1, modified ISO 2016 All rights reserved 1BS EN ISO 24490:2016ISO 24490:2016(E)3.2nominal pressurePNalphanumeric designation used for reference purposes related to a combination of mechanical and dimensional characteristics of a component of a pipework systemNote 1 to en
35、try: It comprises the letters PN followed by a dimensionless number equal to at least the maximum allowable pressure in bar.Note 2 to entry: For a pump, PN can be different for inlet and outlet.Note 3 to entry: For Europe, PN equals the design pressure (PS) as defined in the Pressure Equipment Direc
36、tive (2014/68/EU).3.3specified minimum temperaturelowest temperature for which the pump is specified3.4duty pointperformance point defined by pressure or head and volume or mass flow rate3.5net positive suction headNPSHinlet total head increased by the head (in flowing liquid) corresponding to the a
37、tmospheric pressure at the test location and decreased by the sum of the head corresponding to the vapour pressure of the pump liquid at the inlet temperature and the inlet impeller heightNote 1 to entry: See also ISO 5198:1987, Table 1.4 Requirements for pumps4.1 GeneralCryogenic centrifugal pumps
38、shall comply with appropriate general standards. The appropriate general standard(s) shall be subject to the particular circumstances and applicable regulations and should be agreed between the manufacturer and the purchaser.NOTE Commonly used standards are, e.g. ISO 5199, ISO 13709 (ANSI/API 610) o
39、r EN 809.In the event of conflict, the requirements of this International Standard shall take precedence over the general standards.4.2 Materials4.2.1 GeneralMaterials of construction shall be selected taking into consideration that cryogenic pumps operate at low temperature, often in a damp environ
40、ment, and at times with liquid oxygen or flammable fluids.The minimum requirements given in 4.2.2, 4.2.3 and 4.2.4 shall apply.4.2.2 Mechanical properties at low temperatureMetallic materials which are under stress at low temperature and which exhibit a ductile/brittle transition (such as ferritic s
41、teels) shall have minimum toughness values in accordance with ISO 21028-1 or ISO 21028-2 as appropriate.2 ISO 2016 All rights reservedBS EN ISO 24490:2016ISO 24490:2016(E)Metallic materials which can be shown to have no ductile/brittle transition do not require impact testing.Non-metallic materials
42、are generally used only for seals or heat barriers. If such materials are to be used for structural parts, the stress levels and material impact values shall be shown to be acceptable for the intended use.4.2.3 Corrosion resistanceMaterials should be resistant to, or protected from, atmospheric corr
43、osion. Where this is not achievable, a suitable corrosion allowance shall be considered.4.2.4 Oxygen and oxidizing fluids compatibilityIf the specified minimum service temperature is equal to or less than the boiling point of air or the pump is intended for oxygen service, the materials which are, o
44、r are likely to come, in contact with oxygen or oxygen-enriched air shall be oxygen-compatible in accordance with ISO 21010.If the pump is employed for oxidizing cryogenic fluids, e.g. nitrous oxide, the requirements for oxygen compatibility should be taken into consideration.In the case of nitrous
45、oxide, the risk of decomposition shall also be considered.Materials should be selected that minimize the potential for ignition and inhibit sustained combustion.Suitable material properties are high ignition temperature, high thermal conductivity, and low heat of combustion.Table B.1 lists materials
46、 found through testing and operating experience to be particularly suitable for centrifugal cryogenic pumps in oxygen service. Materials other than those identified in Table B.1 may be used but their selection shall be justified by specific testing or long-term experience in this application.For (an
47、y) parts of the pump which are, or are likely to come, in contact with oxygen and which could be exposed to energy sources such as friction, aluminium or aluminium alloy including aluminium bronzes containing more than 2,5 % aluminium shall not be used. The use of aluminium or aluminium alloy for an
48、y other parts shall only be adopted after careful consideration.Stainless steel shall not be used for exposed thin components. Exceptions allowed are seal bellows, trapped shims or gaskets and screw-locking devices of stationary parts where knowledge of past satisfactory performance is available. Ho
49、wever, suitable alternative materials, e.g. nickel or nickel alloy, Monel1)and Inconel1), should be considered.NOTE Tin bronze has been found to be most suitable for the main “wetted” pump components. The most common aluminium bronzes, which typically contain between 6 % and 11 % aluminium, have relatively high heats of combustion and, if combustion occurs, are practically impossible to extinguish in an oxygen environment.1) Moneland Inconelare the trademarks of products supplied by Special Metals Corporation, New Hartford,New Yo
