1、 Reference number ISO 4427-5:2007(E) ISO 2007INTERNATIONAL STANDARD ISO 4427-5 First edition 2007-08-01 Plastics 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) d
2、estins lalimentation en eau Partie 5: Aptitude lemploi du systme 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 shall not be edited unless the typefaces which are embedded are licensed
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5、t is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2007 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
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7、 ii ISO 2007 All rights reservedISO 4427-5:2007(E) ISO 2007 All rights reserved iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out thro
8、ugh 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 with ISO, also take part in the work. ISO collabor
9、ates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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 Standa
10、rds. Draft International Standards adopted by the technical committees are circulated to the member bodies 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 t
11、his document may be the subject of patent rights. ISO shall not be held responsible for identifying any or 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 fitting
12、s for water supplies. ISO 4427 consists of the following parts, under the general title Plastics piping systems 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 ISO 4427-5:2007(E) iv ISO 2007 All rights re
13、servedIntroduction 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 to treatment and
14、 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 national regulat
15、ions concerning the use and/or the characteristics of these products are in force. INTERNATIONAL STANDARD ISO 4427-5:2007(E) ISO 2007 All rights reserved 1 Plastics piping systems Polyethylene (PE) pipes and fittings for water supply Part 5: Fitness for purpose of the system 1 Scope This part of ISO
16、 4427 specifies the characteristics of the fitness for purpose of assembled piping systems made from polyethylene (PE) intended for the conveyance of water for human consumption, including raw water prior to treatment and water for general purposes. It also specifies the test parameters for the test
17、 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 components of other materials, intended to be used under the following conditions: a) a maximum operating pressure (MOP) up to and including 2
18、5 bar 1) ; 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 C, see ISO 4427-1:2007, Annex A. NOTE 2 ISO 4427 covers a range of maximum operating pressures and gives requirements concerning colo
19、urs and additives. 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 guidance or regulations and installation practices or codes. 2 Normative references The followi
20、ng referenced documents are indispensable for the application of 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 1167-1, Thermoplastics pipes, fittings and assemblies fo
21、r the conveyance of fluids Determination of the resistance to internal pressure Part 1: General method ISO 1167-3, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 3: Preparation of components ISO 3458, Assembled joi
22、nts between fittings and polyethylene (PE) pressure pipes Test of leakproofness under internal pressure 1) 1 bar = 0,1 MPa = 10 5 Pa; 1 MPa = 1 N/mm 2 . ISO 4427-5:2007(E) 2 ISO 2007 All rights reservedISO 3459, Polyethylene (PE) pressure pipes Joints assembled with mechanical fittings Internal unde
23、r- pressure test method and requirement ISO 3501, 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 ben
24、ding ISO 4427-1:2007, Plastics piping systems Polyethylene (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 assembl
25、ies between a polyethylene (PE) pipe and an electrofusion 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 fail
26、ure mode of test pieces from a butt-fused joint ISO 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)
27、electrofusion assemblies 3 Terms, definitions, symbols 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 electro
28、fusion fitting and pipe or fitting with spigotted 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 m
29、ade by heating the planed ends of matching surfaces 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
30、 of a saddle and the outside surface of a pipe by 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,
31、 or any other element of the piping system that generally includes a compression part, to provide for pressure integrity, leaktightness and resistance to end loads ISO 4427-5:2007(E) ISO 2007 All rights reserved 3 NOTE 1 A support sleeve inserted into the pipe bore can be used to provide a permanent
32、 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 connections including PE flanges. The fitting can allow either a dismou
33、ntable 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 ISO 4427 4 Fitness for purpose of the system 4.1 General This clause de
34、tails 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 for testing 4.2.1 General The following subclauses specify the methods
35、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 and component material and tolerances. Test pieces for pressure testing s
36、hall 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 during testing according to this part of ISO 4427, retesting according to
37、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 outside diameter, d nW 16 and 75 W 75 and 250 W 250 and 710 W 710 4.2.3 F
38、itting types This part of ISO 4427 is applicable to the following fitting types: a) fittings with spigot ends; b) electrofusion socket fittings; c) electrofusion saddle fittings; d) mechanical fittings. ISO 4427-5:2007(E) 4 ISO 2007 All rights reserved4.3 Electrofusion joints 4.3.1 Assemblies with p
39、ipes and components having different MRS and SDR a) Preparation When applicable, the assemblies shall be prepared in accordance with Table 2, using pipe and components having a different MRS (minimum required strength) and SDR (standard dimension ratio), in accordance ISO 11413:1996, Table C.1, cond
40、ition 1. Table 2 Sampling scheme Pipe or component PE 63 PE 80 PE 100 Electrofusion fitting SDR max. SDR min. SDR max. SDR min. SDR max. SDR min. PE 63 X X X PE 80 X X X PE 100 X X X b) Test pieces The smallest diameter from each size group plus the largest diameter from the manufacturers own produc
41、t range per product type (see Table 1) shall be taken as the test pieces. c) Requirement The assembly shall be in accordance with the requirement specified in Table 3 for the characteristic cohesive resistance for electrofusion socket fittings or for electrofusion saddle fittings, as applicable. 4.3
42、.2 Assemblies under extreme conditions a) Preparation The assemblies shall be prepared using pipe having the same MRS and SDR as the fitting, in accordance with ISO 11413:1996, Table C.1, conditions 2 and 3, using the minimum and maximum permitted ambient temperatures for joint assembly, T min and T
43、 max , as recommended by the fittings manufacturer and given in his technical file. If accepted by the purchaser, the minimum and maximum energy conditions 2 and 3 may be replaced by a nominal energy at a given ambient temperature at which a joint is made, T a , as defined by the fitting manufacture
44、r in his technical file (see ISO 11413:1996, 3.4). For straight, equal electrofusion socket fittings (couplers), test joints on selected diameters out of the product range, which shall be prepared with a gap of 0,05d nbetween the pipe end and the maximum theoretical depth of penetration of the fitti
45、ng 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. Saddle fittings shall be fused to the test pipe while pressurized with water to the maximum rated pressure. The pipe shall be cut imm
46、ediately after the manufacturers prescribed cooling time has elapsed. NOTE Joints with electrofusion saddle fittings will need to be prepared taking into account national safety regulations. ISO 4427-5:2007(E) ISO 2007 All rights reserved 5 b) Test pieces One diameter from each size group, including
47、 the smallest and largest diameter from the manufacturers own range per product type (see Table 1), shall be taken as test pieces. c) Requirement The assembly shall be in accordance with the requirement specified in Table 3 for the characteristic cohesive resistance for electrofusion socket fittings
48、 or for electrofusion saddle fittings, as applicable. 4.4 Butt fusion joints 4.4.1 Assemblies between components of different MRS The following is to be carried out if requested by the purchaser or end user. a) Preparation The assemblies shall be prepared using pipe and/or fittings with spigot ends
49、of the same SDR and having different MRS, in accordance with ISO 11414, and under normal conditions at 23 C. b) Test piece One diameter from the manufacturers own product range per product type shall be taken as the test piece. c) Requirement The assembly shall be in accordance with the requirement specified in Table 3 for the characteristic tensile strength for butt fusion joints. 4.4.2 Assemblies under extreme conditions The following is to be carried out if requested by
