SANS 4427-5-2008 Plastics piping systems - Polyethylene (PE) pipes and fittings for water supply - Part 5 Fitness for purpose of the system《塑料管道系统 给水用聚乙烯(PE)管和管件 第5部分 系统适用性》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-20750-2 SANS 4427-5:2008Edition 1ISO 4427-5:2007Edition 1SOUTH AFRICAN NATIONAL STANDARD Plastics piping systems Polyethylene (PE) pipes a

4、nd fittings for water supply Part 5: Fitness for purpose of the system This national standard is the identical implementation of ISO 4427-5:2007 and is adopted with the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof

5、private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 4427-5:2008 Edition 1 ISO: 4427-5:2007 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Co

6、mmittee StanSA SC 5120.12K, Water and sanitation Equipment and systems Plastics pipes and fittings, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in July 2008. Reference numberISO 4427-5:2007(E)ISO 2007I

7、NTERNATIONAL STANDARD ISO4427-5First edition2007-08-01Plastics piping systems Polyethylene (PE) pipes and fittings for water supply Part 5: Fitness for purpose of the system Systmes de canalisations en plastique Tubes et raccords en polythylne (PE) destins lalimentation en eau Partie 5: Aptitude lem

8、ploi du systme SANS 4427-5:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 4427-5:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but

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13、9 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All rights reservedSANS 4427-5:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 4427-5:2007(E) ISO 2007 All rights reserved iiiForeword ISO (the Inter

14、national 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

15、been 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. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical st

16、andardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies

17、for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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

18、all such patent rights. ISO 4427-5 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 2, Plastics pipes and fittings for water supplies. ISO 4427 consists of the following parts, under the general title Plastics piping sys

19、tems Polyethylene (PE) pipes and fittings for water supply: Part 1: General Part 2: Pipes Part 3: Fittings Part 5: Fitness for purpose of the system SANS 4427-5:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 4427-5:2007(E) iv ISO 200

20、7 All rights reservedIntroduction ISO 4427, the system standard, specifies the requirements for a piping system and its components when made from polyethylene (PE). The piping system is intended to be used for water supply intended for human consumption, including the conveyance of raw water prior t

21、o treatment and that of water for general purposes. In respect of potential adverse effects on the quality of water intended for human consumption caused by the products covered by ISO 4427: a) ISO 4427 provides no information as to whether the products may be used without restriction; b) existing n

22、ational regulations concerning the use and/or the characteristics of these products are in force. SANS 4427-5:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 4427-5:2007(E) ISO 2007 All rights reserved 1Plastics

23、 piping systems Polyethylene (PE) pipes and fittings for water supply Part 5: Fitness for purpose of the system 1 Scope This part of ISO 4427 specifies the characteristics of the fitness for purpose of assembled piping systems made from polyethylene (PE) intended for the conveyance of water for huma

24、n consumption, including raw water prior to treatment and water for general purposes. It also specifies the test parameters for the test methods to which it refers. In conjunction with the other parts of ISO 4427, it is applicable to PE pipes, fittings, valves, their joints and to joints with compon

25、ents of other materials, intended to be used under the following conditions: a) a maximum operating pressure (MOP) up to and including 25 bar1); b) an operating temperature of 20 C as the reference temperature. NOTE 1 For applications operating at constant temperatures greater than 20 C and up to 40

26、 C, see ISO 4427-1:2007, Annex A. NOTE 2 ISO 4427 covers a range of maximum operating pressures and gives requirements concerning colours and additives. It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular

27、requirements and any relevant national guidance or regulations and installation practices or codes. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the late

28、st edition of the referenced document (including any amendments) applies. ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 1: General method ISO 1167-3, Thermoplastics pipes, fittings and assemblies for t

29、he conveyance of fluids Determination of the resistance to internal pressure Part 3: Preparation of components ISO 3458, Assembled joints between fittings and polyethylene (PE) pressure pipes Test of leakproofness under internal pressure 1) 1 bar = 0,1 MPa = 105Pa; 1 MPa = 1 N/mm2. SANS 4427-5:2008T

30、his s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 4427-5:2007(E) 2 ISO 2007 All rights reservedISO 3459, Polyethylene (PE) pressure pipes Joints assembled with mechanical fittings Internal under-pressure test method and requirement ISO 3501,

31、 Assembled joints between fittings and polyethylene (PE) pressure pipes Test of resistance to pull-out ISO 3503, Assembled joints between fittings and polyethylene (PE) pressure pipes Test of leakproofness under internal pressure when subjected to bending ISO 4427-1:2007, Plastics piping systems Pol

32、yethylene (PE) pipes and fittings for water supply Part 1: General ISO 4427-3, Plastics piping systems Polyethylene (PE) pipes and fittings for water supply Part 3: Fittings ISO 11413:1996, Plastics pipes and fittings Preparation of test piece assemblies between a polyethylene (PE) pipe and an elect

33、rofusion fitting ISO 11414:1996, Plastics pipes and fittings Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test piece assemblies by butt fusion ISO 13953, Polyethylene (PE) pipes and fittings Determination of the tensile strength and failure mode of test pieces from a butt-fused joint I

34、SO 13954, Plastics pipes and fittings Peel decohesion test for polyethylene (PE) electrofusion assemblies of nominal outside diameter greater than or equal to 90 mm ISO 13955, Plastics pipes and fittings Crushing decohesion test for polyethylene (PE) electrofusion assemblies 3 Terms, definitions, sy

35、mbols and abbreviated terms For the purposes of this document, the terms, definitions, symbols and abbreviated terms given in ISO 4427-1 and the following terms and definitions apply. 3.1 electrofusion joint joint between a PE socket or saddle electrofusion fitting and pipe or fitting with spigotted

36、 ends, made by heating the electrofusion fittings by the Joule effect of the heating element incorporated at their jointing surfaces, causing the material adjacent to them to melt and the pipe and fitting surfaces to fuse 3.2 butt fusion joint joint made by heating the planed ends of matching surfac

37、es by holding them against a flat heating plate until the PE material reaches fusion temperature, quickly removing the heating plate and pushing the two softened ends against one another 3.3 saddle fusion joint joint made by heating the curved surface of a saddle and the outside surface of a pipe by

38、 holding them against a heated tool until the PE material reaches fusion temperature, quickly removing the heated tool and pushing the two softened surfaces against each other 3.4 mechanical joint joint made by assembling a PE pipe to another PE pipe, or any other element of the piping system that g

39、enerally includes a compression part, to provide for pressure integrity, leaktightness and resistance to end loads SANS 4427-5:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 4427-5:2007(E) ISO 2007 All rights reserved 3NOTE 1 A suppo

40、rt sleeve inserted into the pipe bore can be used to provide a permanent support for the PE pipe to prevent creep in the pipe wall under radial compressive forces. NOTE 2 Metallic parts of these fittings can be assembled to metallic pipes by jointing threads, compression joints, or welded or flanged

41、 connections including PE flanges. The fitting can allow either a dismountable or permanently assembled joint. 3.5 fusion compatibility ability of two similar or dissimilar polyethylene (PE) materials to be fused together to form a joint which conforms to the performance requirements of this part of

42、 ISO 4427 4 Fitness for purpose of the system 4.1 General This clause details the preparation of test assemblies and the tests required to verify the fusion process under normal and extreme conditions and compatibility; 4.5 gives details of tests on mechanical fittings. 4.2 Preparation of assemblies

43、 for testing 4.2.1 General The following subclauses specify the methods for preparing test assemblies, taking into account the extremes of pipe/fitting manufacturing tolerances, field assembly, equipment tolerances, ambient temperature variations during installation and, where appropriate, sealing a

44、nd component material and tolerances. Test pieces for pressure testing shall be closed with pressure-tight, end-load-bearing caps, plugs or flanges, which shall be provided with connections for the entry of water and release of air. If failures that call for a redesign of the fitting are detected du

45、ring testing according to this part of ISO 4427, retesting according to ISO 4427-3 automatically becomes necessary. 4.2.2 Grouping For testing purposes, the size groups for pipes and fittings shall be in accordance with Table 1. Table 1 Size groups for pipes and fittings Size group 1 2 3 4 Nominal o

46、utside diameter, dnW 16 and 63 mm are under development. fThis test method and its requirements may be superseded by an appropriate test standard under development by ISO/TC 138/SC 5. 4.7 Retest in case of failure at 80 C A fracture in a brittle mode in less than 165 h shall constitute a failure; ho

47、wever, if a sample in the 165 h test fails in a ductile mode in less than 165 h, a retest shall be performed at a selected lower stress in order to achieve the minimum required time for the selected stress obtained from the line through the recommended stress/time points given in Table 4. Table 4 Te

48、st parameters for retesting hydrostatic strength at 80 C PE 40 PE 63 PE 80 PE 100 Stress MPa Test periodh Stress MPa Test periodh Stress MPa Test period h Stress MPa Test periodh 2,5 165 3,5 165 4,5 165 5,4 165 2,4 230 3,4 295 4,4 233 5,3 265 2,3 323 3,3 538 4,3 331 5,2 399 2,2 463 3,2 1 000 4,2 474 5,1 629 2,1 675 4,1 685 5,0 1 000 2,0 1 000 4,0 1 000 Standards South AfricaSANS 4427-5:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .