1、BSI Standards PublicationBS ISO 13951:2015Plastics piping systems Testmethod for the resistance ofplastic pipe/pipe or pipe/fittingassemblies to tensile loadingBS ISO 13951:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 13951:2015. The UK participation in
2、 its preparation was entrusted to TechnicalCommittee PRI/88/4, Test Methods - Plastic Piping.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 responsibl
3、e for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 83582 7 ICS 23.040.01 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards
4、Policy and Strategy Committee on 31 March 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e d ISO 2015Plastics piping systems Test method for the resistance of plastic pipe/pipe or pipe/fitting assemblies to tensile loadingSystmes de canalisations en plastiques Mthode des
5、sai de la rsistance en traction des assemblages tube/tube ou tube/raccord en plastiqueINTERNATIONAL STANDARDISO 13951Second edition 2015-02-15Reference number ISO 13951:2015(E)BS ISO 13951:2015ISO 13951:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015All rights reserved. U
6、nless 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 be requested from either ISO at th
7、e 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 13951:2015ISO 13951:2015(E)Contents PageForeword iv1 Scope . 12 Nor
8、mative references 13 Principle 14 Test parameters and requirements 15 Apparatus . 16 Test pieces . 26.1 Sampling . 26.2 Preparation 27 Conditioning 28 Procedure. 38.1 Setting up the test piece 38.2 Constant-load tensile test 38.3 Constant-speed tensile test 39 Test report . 3Annex A (normative) Test
9、 parameters . 5Bibliography 6 ISO 2015 All rights reserved iiiBS ISO 13951:2015ISO 13951:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carri
10、ed 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 with ISO, also take part in the work. I
11、SO 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, Part 1. In particular the different
12、 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 the elements of this document may be
13、 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 received (see www.iso.org/patents).
14、 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 adherence to the WTO principles i
15、n the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 5, General properties of pipes, fittings and valves of plasti
16、c materials and their accessories Test method and basic specifications.This second edition cancels and replaces the first edition (ISO 13951:2001), which have been technically revised. The reason for modification is for applicability for mechanical fittings to other plastics materials, other sizes a
17、nd/or other test conditions and alignment with texts of other standards on test methods.The modifications are: no material is mentioned; test parameters are omitted, although the original test parameters can be found in Annex A; no requirements are given; editorial changes have been introduced.iv IS
18、O 2015 All rights reservedBS ISO 13951:2015Plastics piping systems Test method for the resistance of plastic pipe/pipe or pipe/fitting assemblies to tensile loadingWARNING Persons using this document should be familiar with normal laboratory practice, if applicable. The use of this International Sta
19、ndard can involve hazardous materials, operations, and equipment. This International Standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this International Standard to establish appropriate safety and health practi
20、ces and determine the applicability of regulatory limitations prior to use.1 ScopeThis International Standard specifies a method for testing the resistance to longitudinal tensile loading of uniaxial plastic pipe/pipe or pipe/fitting assemblies with electrofusion joints, butt fusion joints, or mecha
21、nical fittings (made of plastics or metals). For electrofusion joints and butt fusion joints, this test method is limited to nominal pipe diameters up to and including 250 mm.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indis
22、pensable 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 3126, Plastics piping systems Plastics components Determination of dimensions3 PrincipleThe test consists o
23、f subjecting a plastic pipe/pipe or pipe/fitting assembly to a longitudinal stress by the application of a given constant load for 1 h, followed by application of a load at a constant speed until yielding or failure occurs. The leak tightness of the test piece is verified before the constant load, a
24、fter the constant load, and at the end of the test.4 Test parameters and requirementsThe test parameter of the standard which refers to this International Standard shall be used and the requirements shall be fulfilled. If the parameter is not given in the referring standard, the one given in Annex A
25、 shall apply. The test is carried out at a temperature of (23 2) C.The following test parameter should be given by the standard which refers to this International Standard.a) test stress MPa5 Apparatus5.1 Room, which can be controlled at a temperature of (23 2) C.5.2 Tensile-testing machine or other
26、 equipment, sufficiently powerful to allow tests to be carried out up to the yield point of the pipe. The tensile machine shall be capable of sustaining, between its clamping jaws, a constant load, within a load tolerance of 2 %, and a speed of (25 2,5) mm/min.INTERNATIONAL STANDARD ISO 13951:2015(E
27、) ISO 2015 All rights reserved 1BS ISO 13951:2015ISO 13951:2015(E)5.3 Force-measuring device, capable of checking conformity to the specified loading conditions (see 5.2 and 8.2).5.4 Test piece clamping device, capable of clamping the test piece in the machine.5.5 Time measuring device.5.6 Recording
28、 manometer or contact manometer, covering the range 0 mbar to 55 mbar.5.7 Compressed-air supply, capable of controlling the pressure at (50 5) mbar.5.8 Set of pipes equipped with valves, which can be used to link the test piece to the manometer and the pressure supply or to isolate the test piece ma
29、nometer unit from the pressure supply.5.9 Thermometer, capable of checking conformity to the specified test temperature (see 5.1 and Clause 7).6 Test pieces6.1 SamplingThe pipes and fittings used to produce the test pieces shall be obtained by sampling as specified in the product standard.For electr
30、ofusion couplers where dn 180 mm and where the conduct of tensile tests on fitting/pipe assemblies is beyond the limits of the available test equipment, the testing of joint segments might be appropriate. Testing of segment test pieces shall not be undertaken, however, unless a correlation with test
31、ing of complete pipe/joint assemblies has been established.6.2 PreparationEach test piece shall comprise a complete pipe/pipe, pipe/fitting/pipe, or fitting/pipe/fitting assembly.Pipes of the same nominal pressure (PN) or design SDR as that of the fitting shall be used for the test.All joints shall
32、be made in accordance with the manufacturers instructions and, whenever applicable, the instructions specified in the relevant standards.NOTE 1 For PE, the relevant International Standards are ISO 114131and ISO 12176-24for electrofusion joints and ISO 114142and ISO 12176-13for butt fusion joints.The
33、 free length, l0, of the pipes or spigot ends (between the jaws and the joint/fitting) shall be at least three times the nominal outside diameter dn, with a minimum of 250 mm.Determine the mean wall thickness of the pipe, according to ISO 3126. Attach seals to the free ends of the pipes so that the
34、test piece will remain leak tight at a pressure of 50 mbar. Connect one of these ends to the pressure supply.NOTE 2 It is recommended to reinforce, by means of an internal brace or an electrofusion coupler, the free ends of the pipes that are to be connected to the clamping jaws of the tensile-testi
35、ng machine.7 ConditioningImmediately prior to testing in accordance with Clause 8, condition each test piece at (23 2) C at a time such that testing will not be carried out less than 24 h after the jointing of the pipe/fitting.2 ISO 2015 All rights reservedBS ISO 13951:2015ISO 13951:2015(E)8 Procedu
36、re8.1 Setting up the test pieceConnect the ends of a test piece to the jaws of the tensile-testing machine such that the load is applied along the axis of the pipe.Link the test piece to the pressure supply and introduce a pressure of (50 5) mbar into the test piece and check the leak tightness of t
37、he test piece, e.g. by using a soap solution.8.2 Constant-load tensile testWhile maintaining the pressure of (50 5) mbar apply a tensile load to the test piece so that a load, which corresponds to a longitudinal stress in the pipe wall is reached within 30 s. This load is calculated using Formula (1
38、):FedeTTmnm= ()2 pi (1)whereTis the applicable test stress given in the referring standard (MPa);emis the mean wall thickness of the pipe (mm);dnis the nominal outside diameter of the pipe (mm).Verify the leak tightness after applying the constant load, e.g. by using a soap solution. Maintain the te
39、st piece at this constant load for 1 h, within a load variation of 2 %.Verify the leak tightness after the test period while maintaining the constant load, e.g. by using a soap solution.If the test piece is still leak tight, continue immediately with the second part of the test in accordance with 8.
40、3. Otherwise, report the observations in accordance with Clause 9.8.3 Constant-speed tensile testWhile maintaining the pressure of (50 5) mbar, extend the test piece by applying a tensile load along the longitudinal axis of the test piece at a crosshead speed of (25 2,5) mm/min.Unless the assembly i
41、s pulled apart or one of the test piece components fails otherwise, stop the test when yield of the pipe occurs.In the case of yield, verify the leak tightness after completion of the test, e.g. by using a soap solution.NOTE Yield of plastic materials is the transition from elastic to plastic deform
42、ation, usually characterized by a decrease or a shoulder in the stress-strain curve.9 Test reportThe test report shall include the following information:a) a reference to this International Standard (i.e. ISO 13951) and the referring standard;b) the nominal pressure class (PN) or the design SDR of t
43、he components e.g. fitting(s), pipe comprising the joint(s) under test; ISO 2015 All rights reserved 3BS ISO 13951:2015ISO 13951:2015(E)c) all details necessary for identification of the test pieces, including the nominal size of the pipes and fittings used to produce the test pieces, the type of ma
44、terial, the manufacturers code, and the fusion-jointing procedure used;d) the test temperature;e) the test stress;f) the number of test pieces tested;g) the result of the constant-load tensile test (8.2);h) the result of the constant-speed tensile test (8.3);i) the type(s) of failure;j) any observat
45、ions made during the test;k) any factors which might have affected the results, such as any incidents or any operating details not specified in this International Standard;l) the test laboratory;m) the date of the test.4 ISO 2015 All rights reservedBS ISO 13951:2015ISO 13951:2015(E)Annex A (normativ
46、e) Test parametersThe test stress shall be equal to 6 MPa (6 N/mm2). ISO 2015 All rights reserved 5BS ISO 13951:2015ISO 13951:2015(E)Bibliography1 ISO 11413, Plastics pipes and fittings Preparation of test piece assemblies between a polyethylene (PE) pipe and an electrofusion fitting2 ISO 11414, Pla
47、stics pipes and fittings Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test piece assemblies by butt fusion3 ISO 12176-1, Plastics pipes and fittings Equipment for fusion jointing polyethylene systems Part 1: Butt fusion4 ISO 12176-2, Plastics pipes and fittings Equipment for fusion joi
48、nting polyethylene systems Part 2: Electrofusion6 ISO 2015 All rights reservedBS ISO 13951:2015BS ISO 13951:2015ISO 13951:2015(E) ISO 2015 All rights reservedICS 23.040.01Price based on 6 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and o
49、ther standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards and other standardization products are published by BSI Standards Limited.British Standards Institution (BSI)BSI Group Headquarters389 Chiswick High Road London W4 4AL UKAbout usWe bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into standards -based solutions.The kno
