1、BS ISO22621-5:2010ICS 75.200; 83.140.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPlastics piping systemsfor the supply ofgaseous fuels formaximum operatingpressures up to andincluding 2 MPa (20bar) Polyamide (PA)Part 5: Fitness for purpose of thesystemThis
2、 British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 May2010. BSI 2010ISBN 978 0 580 61546 7Amendments/corrigenda issued since publicationDate CommentsBS ISO 22621-5:2010National forewordThis British Standard is the UK implementation of ISO 22621-5:201
3、0.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/88/2, Plastics piping for pressure applications.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions
4、of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS ISO 22621-5:2010Reference numberISO 22621-5:2010(E)ISO 2010INTERNATIONAL STANDARD ISO22621-5First edition2010-04-15Plastics piping systems for the suppl
5、y of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA) Part 5: Fitness for purpose of the system Systmes de canalisations en matires plastiques pour la distribution de combustibles gazeux pour des pressions maximales de service infrieures ou gales 2 MPa
6、(20 bar) Polyamide (PA) Partie 5: Aptitude lemploi du systme BS ISO 22621-5:2010ISO 22621-5:2010(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 embed
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9、em relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2010 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, includ
10、ing photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Publishe
11、d in Switzerland ii ISO 2010 All rights reservedBS ISO 22621-5:2010ISO 22621-5:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms, definitions, symbols and abbreviated terms .2 3.1 Terms and definitions General 2 3.2 Terms and de
12、finitions for preparation of test assemblies by electrofusion .3 3.3 Symbols3 4 Fitness for purpose .5 4.1 Method of preparation of assemblies for testing.5 4.2 Requirements for fitness for purpose .6 5 Overall service (design) coefficient.9 Annex A (normative) Preparation of test assemblies by butt
13、 fusion 10 Annex B (normative) Preparation of test assemblies by electrofusion 13 Annex C (normative) Test methods for the assessment of fitness for purpose of transition fittings.19 Annex D (normative) Derating coefficients for operating temperatures.21 BS ISO 22621-5:2010ISO 22621-5:2010(E) iv ISO
14、 2010 All rights reservedForeword 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 through ISO technical committees. Each member body interested i
15、n 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 collaborates closely with the International Electrotechnical Commis
16、sion (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 Standards. Draft International Standards adopted by the technical
17、 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 this document may be the subject of patent rights. ISO shall
18、 not be held responsible for identifying any or all such patent rights. ISO 22621-5 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 4, Plastics pipes and fittings for the supply of gaseous fuels. ISO 22621 consists of t
19、he following parts, under the general title Plastics piping systems for the supply of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA): Part 1: General Part 2: Pipes Part 3: Fittings Part 5: Fitness for purpose of the system Part 6: Code of practice for
20、 design, handling and installation BS ISO 22621-5:2010ISO 22621-5:2010(E) ISO 2010 All rights reserved vIntroduction As polyamide material is used for piping systems for the supply of gaseous fuels both at low and high pressure, ISO/TC 138/SC 4 experts decided to split the standardization programme
21、into two series of International Standards, with one series ISO 15439 (all parts) covering low pressures up to 0,4 MPa (4 bar), and the other (ISO 22621) high pressures up to 2 MPa (20 bar). Thin wall thickness pipes and solvent cement joints are used typically for pressures up to 0,4 MPa (4 bar), w
22、hile thicker wall thickness pipes and butt fusion, electrofusion and mechanical joints are typically used for pressures up to 2 MPa (20 bar). For technical and safety reasons, it is not possible to mix the components of the two types of piping system (thin wall thickness pipes cannot be jointed by b
23、utt fusion or mechanical joints and vice versa). In particular, solvent cement joints must not be used for jointing for high-pressure piping systems. BS ISO 22621-5:2010BS ISO 22621-5:2010INTERNATIONAL STANDARD ISO 22621-5:2010(E) ISO 2010 All rights reserved 1Plastics piping systems for the supply
24、of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA) Part 5: Fitness for purpose of the system 1 Scope This part of ISO 22621 specifies the requirements of fitness for purpose of the polyamide (PA) piping system, intended to be buried and used for the su
25、pply of gaseous fuels at maximum operating pressures (MOP) up to and including 2 MPa (20 bar1). It specifies the definitions of electrofusion and butt fusion joints. It also specifies the method of preparation of test piece joints and the tests to be carried out on these joints for assessing the fit
26、ness for purpose of the system under normal and extreme conditions. In addition, it specifies the test parameters for the test methods to which it refers. In conjunction with the other parts of ISO 22621, it is applicable to PA fittings, their joints and joints with components of PA. 2 Normative ref
27、erences The following 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 291, Plastics Standard atmospheres fo
28、r conditioning and testing 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 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the re
29、sistance to internal pressure Part 4: Preparation of assemblies ISO 6259-1, Thermoplastics pipes Determination of tensile properties Part 1: General test method ISO 13953, Polyethylene (PE) pipes and fittings Determination of the tensile strength and failure mode of test pieces from a butt-fused joi
30、nt 1) 1 bar = 0,1 MPa = 105Pa; 1 MPa = 1 N/mm2. BS ISO 22621-5:2010ISO 22621-5:2010(E) 2 ISO 2010 All rights reservedISO 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, Plasti
31、cs pipes and fittings Crushing decohesion test for polyethylene (PE) electrofusion assemblies ISO 22621-1, Plastics piping systems for the supply of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA) Part 1: General ISO 22621-2, Plastics piping systems fo
32、r the supply of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA) Part 2: Pipes ISO 22621-3, Plastics piping systems for the supply of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA) Part 3: Fittings 3 Term
33、s, definitions, symbols and abbreviated terms For the purposes of this document, the terms, definitions, symbols and abbreviated terms given in ISO 22621-1 and the following apply. 3.1 Terms and definitions General 3.1.1 electrofusion joint joint between a PA electrofusion socket or saddle fitting a
34、nd a pipe or a spigot end fitting NOTE The electrofusion fittings are heated 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. 3.1.2 butt fusion joint (using heated tool) joint
35、made by heating the planed ends the surfaces of which match by holding them against a flat heating plate until the PA material reaches fusion temperature, removing the heating plate quickly and pushing the two softened ends against one another 3.1.3 fusion compatibility ability of two similar or dis
36、similar polyamide materials to be fused together to form a joint which conforms to the performance requirements of this standard 3.1.4 transition fitting fitting that makes a transition joint between a polyamide (PA) piping and a metallic pipe 3.1.5 transition joint joint at which two different pipi
37、ng materials (the PA and metal piping) are connected 3.1.6 anodeless riser type of transition fitting which is designed to transport gas from an underground polyamide (PA) service line to above-ground steel piping NOTE In an anodeless riser, the PA pipe is always the gas carrier, at least, in the be
38、low ground section. BS ISO 22621-5:2010ISO 22621-5:2010(E) ISO 2010 All rights reserved 33.2 Terms and definitions for preparation of test assemblies by electrofusion 3.2.1 reference time tRtheoretical fusion time indicated by the fitting manufacturer for the reference ambient temperature See Annex
39、B. 3.2.2 fusion energy electrical energy supplied during the fusion-jointing cycle as measured at the terminals of the fitting at a given ambient temperature, Ta, and for electrical parameters whose values lie within the tolerance ranges declared by the manufacturer NOTE 1 The fitting manufacturer i
40、s generally required to state in the technical file any variations in fusion energy input required as a function of the ambient temperature in the range Tminto Tmax. NOTE 2 Where applicable, energy measurement should exclude the effect of terminal contact resistance. 3.2.3 reference energy energy su
41、pplied to a fitting having a nominal electrical resistance and using the nominal fusion parameters defined by the manufacturer at the reference ambient temperature, TR See Annex B. 3.2.4 maximum energy maximum value of the fusion energy supplied for jointing at a given ambient temperature, Ta See An
42、nex B. 3.2.5 minimum energy minimum value of the fusion energy supplied for jointing at a given ambient temperature, Ta See Annex B. 3.2.6 nominal energy nominal energy supplied for jointing at a given ambient temperature, Ta See Annex B. 3.3 Symbols Application Symbol Description Unit Symbols used
43、in more than one phase of the fusion-jointing cycleaennominal pipe wall thickness mm dnnominal external diameter of the pipe p pressure applied to the butt fusion joint interface t duration of each phase in the fusion cycle Tnomnominal temperature (23 2) C C Tmaxmaximum permissible ambient temperatu
44、re C Tminminimum permissible ambient temperature C BS ISO 22621-5:2010ISO 22621-5:2010(E) 4 ISO 2010 All rights reservedApplication Symbol Description Unit Symbols for joint geometryaa misalignment between the pipes or fittings to be butt-fused, expressed in terms of the difference between the exter
45、nal diameters mm w clearance between the fusion faces, expressed in terms of the gap between the prepared faces mm Symbols for ambient temperatureab Taambient temperature at which the joint is made C Symbols for butt fusion cycle parametersa: General T heater-plate temperature, measured in the zone
46、of the heater-plate surface in contact with the pipe or spigot ends to be butt-fused C Phase 1: heating p1interface pressure during the heating phase, i.e. the pressure applied in the contact zone MPa B1initial bead width taken as the bead width at the end of the heating phase mm t1heating time, tak
47、en as the time necessary to obtain a bead of width B1 in the joint region during the heating phase s Phase 2: heat soak p2pressure between the heater plate and the pipe or spigot ends during the heat soak phase MPa t2duration of internal heating during the heat soak phase s Phase 3: withdrawal of he
48、ater plate t3time between the moment when the heater plate is removed from the pipe and/or spigot ends and the moment when the pipe and/or spigot ends are placed in contact with each other s Phase 4: pressure increase t4time required to establish the butt fusion pressure s Phase 5: butt fusion p5pre
49、ssure applied to the contact zone during the butt fusion phase MPa t5time during which the assembly remains under the butt fusion pressure in the machine min Phase 6: cooling t6cooling time during which the butt-fused assembly is not subjected to any rough handling; this cooling can take place outside the machine min B2bead width obtained at the end of the cooling phase mm Symbols for the preparation of test assemblies by electrofusionc Dimmean inside dia
