1、BSI Standards PublicationBS ISO 4437-5:2014Plastics piping systems forthe supply of gaseous fuels -Polyethylene (PE)Part 5: Fitness for purpose of the systemBS ISO 4437-5:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 4437-5:2014.T o g e t h e r w i t h B
2、 S I S O 4 4 3 7 - 1 : 2014, BS ISO 4437-2:2014 and BS ISO 4437-3:2014, it supersedes BS ISO 4437:2007, BS ISO 8085-1:2001, BS ISO 8085-2:2001, and BS ISO 8085-3:2001, which are withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/88/2, Plastics piping for press
3、ure applications.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 application. The British Standards Institution 2014.Publis
4、hed by BSI Standards Limited 2014ISBN 978 0 580 77409 6ICS 75.200; 83.140.30Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2014.Amendments/corrigenda
5、 issued since publicationDate T e x t a f f e c t e dBS ISO 4437-5:2014 ISO 2014Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) Part 5: Fitness for purpose of the systemSystmes de canalisations en matires plastiques pour la d istribution de combustibles gazeux Polythylne
6、(PE) Partie 5: Aptitude lemploi du systmeINTERNATIONAL STANDARDISO4437-5First edition2014-01-15Reference numberISO 4437-5:2014(E)BS ISO 4437-5:2014ISO 4437-5:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of this pu
7、blication 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 from either ISO at the address below or ISOs member body in the co
8、untry 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 4437-5:2014ISO 4437-5:2014(E) ISO 2014 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12
9、 Normative references 13 Terms and definitions . 24 Fitness for purpose of the system . 24.1 Method of preparation of assemblies for testing 24.2 Requirements for fitness for purpose of the system 34.3 Conditioning 64.4 Requirements . 64.5 Retest in case of failure at 80 C . 65 Design coefficient 6A
10、nnex A (informative) Derating coefficients for operating temperatures 9Annex B (normative) Rapid crack propagation (RCP) resistance of pipe at temperatureless than 0 C 10Bibliography .11BS ISO 4437-5:2014ISO 4437-5:2014(E)ForewordISO (the International Organization for Standardization) is a worldwid
11、e 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 established has the right to be represented on that
12、 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 standardization.The procedures used to develop this docume
13、nt 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 with the editorial rules of the ISO/IEC Directives
14、, 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 patent rights identified during the development
15、 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.For an explanation on the meaning of ISO specif
16、ic 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 for this document is ISO/TC 138, Plastics pipes,
17、fittings and valves for the transport of fluids, Subcommittee SC 4, Plastics pipes and fittings for the supply of gaseous fuels.This first edition of ISO 4437-5 together with the first editions of ISO 4437-1, ISO 4437-2 and ISO 4437-3 cancel and replace ISO 4437:2007, ISO 8085-1:2001, ISO 8085-2:200
18、1 and ISO 8085-3:2001, of which they constitute a technical revision.ISO 4437 consists of the following parts, under the general title Plastics piping systems for the supply of gaseous fuels Polyethylene (PE) : Part 1: General Part 2: Pipes Part 3: Fittings Part 4: Valves Part 5: Fitness for purpose
19、 of the systemiv ISO 2014 All rights reservedBS ISO 4437-5:2014ISO 4437-5:2014(E)IntroductionThis part of ISO 4437 specifies the requirements of a piping system and its components made from polyethylene (PE), and which is intended to be used for the supply of gaseous fuels.Requirements and test meth
20、ods for material and components are specified in ISO 4437-1, ISO 4437-2, ISO 4437-3, and ISO 4437-4.Recommended practice for installation is given in ISO/TS 10839.2This part of ISO 4437 covers the characteristics of fitness for purpose of the system. ISO 2014 All rights reserved vBS ISO 4437-5:2014B
21、S ISO 4437-5:2014Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) Part 5: Fitness for purpose of the system1 ScopeThis part of ISO 4437 specifies the requirements of fitness for purpose of the polyethylene (PE) piping system to be used for the supply of gaseous fuels.It sp
22、ecifies the definitions of electrofusion, socket fusion, butt fusion, and mechanical joints.It specifies the method of preparation of test piece joints and the tests to be carried out on these joints for assessing the fitness for purpose of the system under normal and extreme conditions.It specifies
23、 the test parameters for the test methods referred to in this part of ISO 4437.In conjunction with ISO 4437-1, ISO 4437-2, ISO 4437-3, and ISO 4437-4, it is applicable to PE pipes, fittings, valves, their joints, and joints with components of PE and other materials intended to be used under the foll
24、owing conditions:a) the maximum operating pressure (MOP) is based on the design stress, determined from the compound minimum required strength (MRS) divided by the C factor, and taking into account rapid crack propagation (RCP) requirements;b) a temperature of 20 C as reference temperature for the d
25、esign basis.NOTE 1 For other operating temperatures, derating coefficients are given in Annex A.NOTE 2 It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations
26、 and installation practices or codes.2 Normative referencesThe following documents, in whole or in 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 refe
27、renced document (including any amendments) applies.ISO 1167-1:2006, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 1: General methodISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fl
28、uids Determination of the resistance to internal pressure Part 2: Preparation of pipe test piecesISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 4: Preparation of assembliesISO 4437-2, Plastics piping sy
29、stems for the supply of gaseous fuels Polyethylene (PE) Part 2: PipesISO 4437-3, Plastics piping systems for the supply of gaseous fuels Polyethylene (PE) Part 3: FittingsINTERNATIONAL STANDARD ISO 4437-5:2014(E) ISO 2014 All rights reserved 1BS ISO 4437-5:2014ISO 4437-5:2014(E)ISO 10838-11), Mechan
30、ical fittings for polyethylene piping systems for the supply of gaseous fuels Part 1: Metal fittings for pipes of nominal outside diameter less than or equal to 63 mmISO 10838-21), Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels Part 2: Metal fittings for pipes of
31、 nominal outside diameter greater than 63 mmISO 10838-31), Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels Part 3: Thermoplastics fittings for pipes of nominal outside diameter less than or equal to 63 mmISO 11413:2008, Plastics pipes and fittings Preparation of t
32、est piece assemblies between a polyethylene (PE) pipe and an electrofusion fittingISO 11414:2009, Plastics pipes and fittings Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test piece assemblies by butt fusionISO 13477, Thermoplastics pipes for the conveyance of fluids Determination of r
33、esistance to rapid crack propagation (RCP) Small-scale steady-state test (S4 test)ISO 13478, Thermoplastics pipes for the conveyance of fluids Determination of resistance to rapid crack propagation (RCP) Full-scale test (FST)ISO 13953, Polyethylene (PE) pipes and fittings Determination of the tensil
34、e strength and failure mode of test pieces from a butt-fused jointISO 13954, Plastics pipes and fittings Peel decohesion test for polyethylene (PE) electrofusion assemblies of nominal outside diameter greater than or equal to 90 mmISO 13955, Plastics pipes and fittings Crushing decohesion test for p
35、olyethylene (PE) electrofusion assembliesISO 13956, Plastics pipes and fittings Decohesion test of polyethylene (PE) saddle fusion joints Evaluation of ductility of fusion joint interface by tear testISO 21751, Plastics pipes and fittings Decohesion test of electrofusion assemblies Strip-bend test3
36、Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 4437-1 and the following apply.3.1mechanical jointjoint made by assembling a PE pipe with a fitting that generally includes a compression part to provide for pressure integrity, leak tightness, and resista
37、nce to end loads4 Fitness for purpose of the system4.1 Method of preparation of assemblies for testing4.1.1 GeneralThe joints shall be made by using pipes conforming to ISO 4437-2 and fittings conforming to ISO 4437-3.Test pieces for pressure testing shall be closed with pressure-tight, end-load-bea
38、ring end caps, plugs, or flanges which shall be provided with connections for the entry of water and release of air.The peelable layer of peelable-layer pipe shall be removed in the area of the joint prior to jointing.Test assemblies should be prepared taking into consideration applicable national s
39、afety regulations. 1) These International Standards are under revision and will be replaced by ISO 17885.2 ISO 2014 All rights reservedBS ISO 4437-5:2014ISO 4437-5:2014(E)4.1.2 Butt fusion jointsPE pipes, spigot end fittings, and valves intended to be used for jointing by butt fusion shall be prepar
40、ed and assembled in accordance with ISO 11414:2009. The conditions for the preparation of the joints are given in 4.2.2.1 for the assessment of fitness for purpose of the system under normal conditions and in 4.2.2.2 for the assessment of fitness for purpose of the system under extreme conditions.4.
41、1.3 Electrofusion jointsPE pipes, fittings and valves intended to be used for jointing by electrofusion shall be prepared and assembled in accordance with ISO 11413:2008. The conditions for the preparation of the joints are given in 4.2.3.1 for the assessment of fitness for purpose of the system und
42、er normal conditions and in 4.2.3.2 for the assessment of fitness for purpose of the system under extreme conditions.For joints with electrofusion saddle fittings, the electrofusion saddle fitting shall be fused to the pipe while it is pneumatically pressurized to the allowable maximum operating pre
43、ssure. The pipe shall be cut immediately after the manufacturer prescribed cooling time has elapsed.For straight equal electrofusion socket fittings (couplers), test joints on selected diameters out of the product range shall be prepared with a gap of 0,05dnbetween the pipe end and the maximum theor
44、etical depth of penetration of the fitting, where for diameters greater than 225 mm, the adjoining pipes shall be arranged to provide the maximum angular deflection possible for the fitting, limited to 1,5.4.1.4 Mechanical jointsFor mechanical joints, the assembly of the PE pipe and the fitting shal
45、l be prepared in accordance with ISO 10838-1, ISO 10838-2, or ISO 10838-3, as applicable.NOTE The ISO 10838 series will be replaced by ISO 17885.A support sleeve inserted into the pipe bore should be used to provide a permanent support for the PE pipe to prevent creep in the pipe wall under radial c
46、ompressive forces. The metallic part of this fitting can be assembled to a metallic pipe by screw threads, compression joints, welded or brazed flanges, or by other means.4.1.5 Socket fusion jointsFitness for purpose of the system testing shall be agreed between the manufacturer and the end-user.4.2
47、 Requirements for fitness for purpose of the system4.2.1 GeneralWhen tested in accordance with the test methods in Table 5 using the indicated parameters, joints prepared in accordance with 4.1 shall have mechanical characteristics conforming to the requirements given in Table 5, as applicable to th
48、e following types of joints: (A) electrofusion socket fittings; (B) electrofusion saddle fitting; (C) spigot end fitting, pipe.4.2.2 Fitness for purpose of the system for butt fusion joints4.2.2.1 Under normal conditions (ambient temperature 23 C)For the assessment of fitness for purpose of the syst
49、em under normal conditions, butt fusion joints shall have the characteristic of tensile strength conforming to the requirement given in Table 5, using the ISO 2014 All rights reserved 3BS ISO 4437-5:2014ISO 4437-5:2014(E)parameters as specified in Annex B, condition 1 of ISO 11414:2009 at an ambient temperature of 23 C 2 C and the scheme listed in Table 1.Table 1 Scheme for butt-fused jointsPipe/spigot end fit-ting/valve with spigot endsPipePE 80 PE 100PE 80 X XaPE 1
