1、BSI Standards PublicationBS ISO 5149-2:2014Refrigerating systems andheat pumps Safety andenvironmental requirementsPart 2: Design, construction, testing,marking and documentationBS ISO 5149-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 5149-2:2014.The
2、UK participation in its preparation was entrusted to TechnicalCommittee RHE/18, Refrigeration safety.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are resp
3、onsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 69106 5ICS 27.080; 27.200Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStan
4、dards Policy and Strategy Committee on 30 April 2014.Amendments issued since publicationDate Text affectedBS ISO 5149-2:2014 ISO 2014Refrigerating systems and heat pumps Safety and environmental requirements Part 2: Design, construction, testing, marking and documentationSystmes frigorifiques et pom
5、pes chaleur Exigences de scurit et denvironnement Partie 2: Conception, construction, essais, marquage et documentationINTERNATIONAL STANDARDISO5149-2First edition2014-04-15Reference numberISO 5149-2:2014(E)BS ISO 5149-2:2014ISO 5149-2:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUME
6、NT ISO 2014All 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 b
7、e requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 5149-2:2014ISO 5149-2:2014(E) ISO
8、2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 24 Requirements for components and piping . 24.1 General requirements . 24.2 Specific requirements for particular components . 44.3 Materials . 44.4 Testing 64.5 Marking and documentation
9、 . 75 Requirements for assemblies . 85.1 General . 85.2 Design and construction . 95.3 Testing . 285.4 Marking and documentation 32Annex A (informative) Checklist for external visual inspection of the refrigerating system .36Annex B (normative) Additional requirements for refrigerating systems and h
10、eat pumps with ammonia (NH3) .37Annex C (informative) Determination of category for assemblies .38Annex D (normative) Requirements for intrinsic safety test.44Annex E (informative) Examples for arrangement of pressure relief devices in refrigerating systems 46Annex F (normative) Allowable equivalent
11、 length of discharge piping 51Annex G (informative) Stress corrosion cracking 53Bibliography .56BS ISO 5149-2:2014ISO 5149-2:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Inter
12、national 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 wit
13、h 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 Directives,
14、 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 of t
15、he 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 declarations
16、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 meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs
17、 adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 86, Refrigeration and air conditioning, Subcommittee SC 1, Safety and environmental requirements for refrigeratin
18、g systems.ISO 5149-2, together with ISO 5149-1, ISO 5149-3, and ISO 5149-4, cancels and replaces ISO 5149:1993, which has been technically revised.ISO 5149 consists of the following parts, under the general title Refrigerating systems and heat pumps Safety and environmental requirements: Part 1: Def
19、initions, classification and selection criteria Part 2: Design, construction, testing, marking and documentation Part 3: Installation site Part 4: Operation, maintenance, repair and recoveryiv ISO 2014 All rights reservedBS ISO 5149-2:2014INTERNATIONAL STANDARD ISO 5149-2:2014(E)Refrigerating system
20、s and heat pumps Safety and environmental requirements Part 2: Design, construction, testing, marking and documentation1 ScopeThis part of ISO 5149 is applicable to the design, construction, and installation of refrigerating systems, including piping, components, materials, and ancillary equipment d
21、irectly associated with such systems, which are not covered in ISO 5149-1, ISO 5149-3, or ISO 5149-4. It also specifies requirements for testing, commissioning, marking, and documentation. Requirements for secondary heat-transfer circuits are excluded except for any safety devices associated with th
22、e refrigerating system.This part of ISO 5149 is applicable to new refrigerating systems, extensions or modifications of already existing systems, and for used systems, being transferred to and operated on another site.This part of ISO 5149 applies to:a) refrigerating systems, stationary or mobile, o
23、f all sizes including heat pumps;b) secondary cooling or heating systems;c) the location of the refrigerating systems;d) replaced parts and added components after the adoption of this part of ISO 5149, if they are not identical in function and in capacity.This part of ISO 5149 does not cover “motor
24、vehicle air conditioners”. It does not apply to goods in storage, with respect to spoilage or contamination, but it also applies in the case of the conversion of a system for another refrigerant.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this do
25、cument 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 817Refrigerants Designation systemISO 4126-1, Safety devices for protection against exc
26、essive pressure Part 1: Safety valvesISO 4126-2, Safety devices for protection against excessive pressure Part 2: Bursting disc safety devicesISO 5149-1, Refrigerating systems and heat pumps Safety and environmental requirements Part 1: Definitions, classification and selection criteriaISO 5149-4, R
27、efrigerating systems and heat pumps Safety and environmental requirements Part 4: Operation, maintenance, repair and recoveryISO 6708, Pipework components Definition and selection of DN (nominal size)ISO 7010:2011, Graphical symbols Safety colours and safety signs Registered safety signsISO 12100, S
28、afety of machinery General principles for design Risk assessment and risk reduction ISO 2014 All rights reserved 1BS ISO 5149-2:2014ISO 5149-2:2014(E)ISO 14903, Refrigerating systems and heat pumps Qualification of tightness of components and jointsIEC 60204-1, Safety of machinery Electrical equipme
29、nt of machines Part 1: General requirementsIEC 60335-2-24, Household and similar electrical appliances Safety Part 2-24: Particular requirements for refrigerating appliances, ice-cream appliances and ice-makersIEC 60335-2-40, Safety of household and similar electrical appliances Part 2-40: Particula
30、r requirements for electrical heat pumps, air-conditioners and dehumidifiersIEC 60335-2-89, Household and similar electrical appliances Safety Part 2-89: Particular requirements for commercial refrigerating appliances with an incorporated or remote refrigerant unit or compressorIEC 60730-2-6, Automa
31、tic electrical controls for household and similar use Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements3 Terms and definitionsFor the purposes of this document, the definitions given in ISO 5149-1 apply.4 Requirements for component
32、s and piping4.1 General requirementsRefrigerating appliances or systems constructed according to product standards such as IEC 60335-2-24 or IEC 60335-2-89 are presumed to be in conformity with this part of ISO 5149.IEC 60335-2-40 requires appliances to conform to the requirements of this Internatio
33、nal Standard with regard to mechanical strength. In all other respects, appliances constructed according to IEC 60335-2-40 are presumed to be in conformity with this part of ISO 5149.Components and piping shall comply with the related standards or requirements as indicated in Table 1. Components not
34、 included in Table 1 shall conform to relevant national standards or codes. For components not listed in Table 1 or not covered by national standards or codes, the requirements of 4.2 to 4.5 shall apply.The same requirements as class 2 shall be applied to class 2L, unless specific provisions are giv
35、en in this part of ISO 5149.2 ISO 2014 All rights reservedBS ISO 5149-2:2014ISO 5149-2:2014(E)Table 1 Components and piping requirementsComponent and piping RequirementsFired heat exchangers see Clause 4Heat exchangers: pipe coil without air (tube in tube) multi-tubular (shell and tubes)see Clause 4
36、Plate heat exchangers see Clause 4Headers and coils with air as secondary fluid see Clause 4Receiver/accumulator/economizer see Clause 4Oil separator see Clause 4Drier see Clause 4Filter see Clause 4Muffler see Clause 4Hermetic positive displacement compressor see IEC 603352-34 or IEC 602041Semi-her
37、metic positive displacement compressor see IEC 603352-34 or IEC 602041Open positive displacement compressor Non-positive displacement compressor see IEC 602041Pump see IEC 602041 combined with 4.4.3 and 4.5.1General requirementsAdditional requirements for NH3plantssee Annex BPiping see Clause 4Pipin
38、g jointsPermanent jointsDetachable jointssee Clause 4Flexible piping see ISO 13971Valve Safety valve see ISO 4126-1 combined with 4.4.3Safety switching devices for limiting the pressure see Clause 4Control pressure switch see Clause 4Isolating valves see Clause 4Hand-operated valves Capped valves Bu
39、rsting disc see ISO 4126-2 combined with 4.4.3Fusible plug see 4.5.3Liquid level indicators see Clause 4Gauges see Clause 4Soldering materials see 4.3.9Welding materials see 4.3If the component contains electrical components and if the component standard does not cover electrical safety, then the co
40、mponent shall fulfil the requirements of IEC 60335-2-40, IEC 60335-2-24, or IEC 60204-1. ISO 2014 All rights reserved 3BS ISO 5149-2:2014ISO 5149-2:2014(E)4.2 Specific requirements for particular components4.2.1 Piping jointsJoints shall be designed so that they will not be damaged because of freezi
41、ng of water on the outside. They shall be suitable for the pipe, the piping material, and the pressure, temperature, and fluid.Coated (e.g. galvanized) pipes shall not be welded unless all coating has been completely removed from the joint area. Welded joints shall be suitably protected.4.2.2 Isolat
42、ing valvesValves which are used for isolation shall prevent flow in either direction when closed.4.3 Materials4.3.1 Cast iron and malleable ironCast iron and malleable iron shall only be used when suitable for the particular application, in accordance with the requirements of this part of ISO 5149.N
43、OTE 1 Since some grades of cast iron are brittle, their application is dependent on temperature/stress/design considerations.NOTE 2 Malleable iron has two general classifications with several different grades in each. These can have very different mechanical properties.4.3.2 Steel, cast steel, carbo
44、n steel, and low-alloy steelSteel, cast steel, carbon steel, and low-alloy steel can be used for all parts carrying refrigerant and also for heat-transfer medium circuits. Where there is a combination of low temperatures and high pressure and/or where corrosion risks and/or thermal stresses are pres
45、ent, steel with adequate impact strength shall be used, paying regard to thickness, the lowest operating temperature, and its welding properties.NOTE Guidance on stress corrosion cracking in carbon steel vessels is given in G.3.4.3.3 High-alloy steelHigh-alloy steel can be required where there is a
46、combination of low temperatures and high pressure and/or where corrosion risks and/or thermal stresses are present. The impact strength shall be adequate for the particular duty and the material suitable for welding, if required.4.3.4 Stainless steelWhen using stainless steel, care shall be taken to
47、 ensure that the grade of stainless steel is compatible with the process fluids and possible atmospheric impurities, e.g. sodium chloride (NaCl) and sulphuric acid (H2SO4).4.3.5 Copper and copper alloysCopper in contact with refrigerants shall be oxygen-free or de-oxidized.Copper and alloys with a h
48、igh percentage of copper shall not be used for parts carrying ammonia unless their compatibility has been previously established.NOTE Guidance on stress corrosion cracking in copper pipes is given in G.2.4 ISO 2014 All rights reservedBS ISO 5149-2:2014ISO 5149-2:2014(E)4.3.6 Aluminium and aluminium
49、alloysAluminium used for gaskets for use with ammonia shall be of at least 99,5 % purity. Aluminium alloys containing more than 2 % magnesium shall not be used with halogenated refrigerants unless their compatibility has been previously established.Aluminium and its alloys shall not be used in contact with methyl chloride (CH3Cl).NOTE Aluminium and aluminium alloys can be used in any part of the refrigerant circuit provided that its strength is adequate and it is compatible with the
