1、BSI Standards PublicationBS ISO 8639:2016Glass-reinforced thermosettingplastics (GRP) pipes andfittings Test methods forleaktightness and proof ofstructural design of flexiblejointsBS ISO 8639:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 8639:2016.The U
2、K 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 beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a co
3、ntract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 84932 9ICS 23.040.60Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the aut
4、hority of theStandards Policy and Strategy Committee on 29 February 2016.Amendments issued since publicationDate Text affectedBS ISO 8639:2016 ISO 2016Glass-reinforced thermosetting plastics (GRP) pipes and fittings Test methods for leaktightness and proof of structural design of flexible jointsTube
5、s et raccords en plastiques thermodurcissables renforcs de verre (PRV) Mthodes dessai pour ltanchit et preuve de conception structurelle de joint flexibleINTERNATIONAL STANDARDISO8639Second edition2016-02-15Reference numberISO 8639:2016(E)BS ISO 8639:2016ISO 8639:2016(E)ii ISO 2016 All rights reserv
6、edCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless 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 intran
7、et, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.is
8、o.orgBS ISO 8639:2016ISO 8639:2016(E)Foreword ivIntroduction v1 Scope . 12 Terms and definitions . 13 Principle 14 Apparatus . 24.1 End-sealing devices. 24.2 Supports and restraints . 25 Test pieces . 55.1 Assembly 55.2 Number 66 Conditioning 67 Test temperature 68 Procedure. 68.1 General . 68.2 Neg
9、ative pressure . 68.3 Simultaneous angular deflection and draw . 78.4 Simultaneous draw and deformation 78.5 Cyclic pressure 88.6 Positive static pressure 89 Test report . 9 ISO 2016 All rights reserved iiiContents PageBS ISO 8639:2016ISO 8639:2016(E)ForewordISO (the International Organization for S
10、tandardization) 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 been established has the ri
11、ght 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 standardization.The procedure
12、s 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 approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial ru
13、les of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention 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
14、during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny 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 meanin
15、g of ISO specific 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,
16、Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 6, Reinforced plastics pipes and fittings for all applications.This second edition cancels and replaces the first edition (ISO 8639:2000), which has been technically revised. The modifications are: changed title and sco
17、pe to cover the proof of structural design of flexible joints; changed scope to mention that the test procedure is a destructive test; changed testing sequences from mandatory to suggested; changed wording from misalignment to deformation; clarified support conditions; additional test sequence for t
18、he proof of the structural design (Clause 8); changes in Table 1 with additional testing sequences for the proof of the structural design of flexible joints;iv ISO 2016 All rights reservedBS ISO 8639:2016ISO 8639:2016(E)IntroductionIn a pipework system, pipes and fittings of different nominal pressu
19、res and stiffnesses may be used.Any joint made between pipes and/or fittings should be designed such that its performance is equal to or better than the requirements of the pipeline, but not necessarily of the components being joined.The requirements for assembly of the joint are not included in thi
20、s International Standard, but they should be in accordance with the manufacturers recommendations.The material-dependent parameters and/or performance requirements are stated in the referring specification. ISO 2016 All rights reserved vBS ISO 8639:2016BS ISO 8639:2016Glass-reinforced thermosetting
21、plastics (GRP) pipes and fittings Test methods for leaktightness and proof of structural design of flexible joints1 ScopeThis International Standard specifies test methods for flexible non-thrust resistant socket-and-spigot joints with elastomeric sealing elements for buried and above ground glass-r
22、einforced thermosetting plastics (GRP) pipeline applications. It covers methods of test for the leaktightness and resistance to damage of the joint only, when subject to specified combinations of longitudinal extension (draw), angular movement (angular deflection), compression (deformation) perpendi
23、cular to the pipe axis and internal pressure. This International Standard is applicable to joints for either pressure or non-pressure applications.NOTE The joints tested in accordance with this International Standard are subjected to conditions which measure their ability to function and thereby pro
24、ve the design of the joint, especially for type test purposes.These test procedures are applicable to joints for pipes and fittings of all nominal sizes. The tests are suitable for the evaluation of joints intended for applications in which the liquids are conveyed at temperatures specified in the r
25、eferring standards.The test procedures in this International Standard are damaging to the test piece which will not be suitable for reuse after these tests. The test procedure shall be applied for type testing purposes.2 Terms and definitionsFor the purposes of this document, the following terms and
26、 definitions apply.2.1pressurehydrostatic gage pressure2.2angular deflectionangle between the axes of the joint and the consecutive pipe(s), expressed in degrees ()2.3drawlongitudinal movement of the pipe relative to the socket (joint), expressed in millimetres (mm)2.4total drawsum of the draw, and
27、the additional longitudinal movement, of joint components due to the presence of angular deflection, expressed in millimetres (mm)2.5deformationpipe deformation in the coupling as a result of a vertical force on the pipe and a supported coupling causing a step between the two pipe spigots at the loa
28、ding position in millimeters (mm)3 PrincipleA test piece comprising two pieces of pipe jointed together, by incorporation of a socket or inclusion of a double-socket coupler, is subjected to specified combinations of draw, angular deflection and INTERNATIONAL STANDARD ISO 8639:2016(E) ISO 2016 All r
29、ights reserved 1BS ISO 8639:2016ISO 8639:2016(E)deformation. In each specified combination the test piece is subjected to a series of test pressures for specified periods of time, including an internal sub-atmospheric test pressure.In addition, a test at elevated positive static pressure is conducte
30、d to prove the structural design of the coupling.When under pressure, the joint is monitored for leakage.Between each test condition (see Table 1) the joint is inspected for signs of damage.NOTE It is assumed that the following test parameters are set by the standard making reference to this Interna
31、tional Standard: the nominal size of the components to be connected by the joint (see 5.1 ); the pressure class of the components (see 5.1); the total effective length, L, of the test piece (see 5.1); the number of test pieces (see 5.2); if applicable, the conditioning to be applied (see Clause 6);
32、the test temperature (see Clause 7); sequence of testing, if appropriate (see 8.1); the joint positions (see Table 1); the draw, angular deflection (see 8.3 ) and the force, F (see 8.4); the permissible change in negative pressure (see 8.2.3).4 Apparatus4.1 End-sealing devicesEnd sealing devices, of
33、 sizes and type appropriate to the components under test, anchored to take the axial end thrust and permit free longitudinal movement.4.2 Supports and restraints4.2.1 Longitudinal supports, capable of supporting the end thrust induced by the internal pressure but which shall not otherwise support th
34、e joint (see Figure 1, Figure 2 and Figure 3).4.2.2 Straps or cradles, (100 5) mm wide supporting up to an 180 arc of the pipe barrel or of the socket (see Figure 3).The use is as follows:a) a strap, cradle or support, to support the socket on a fixed base, as required for deformation testing (see 8
35、.4);b) a strap or cradle, positioned adjacent to the end of the joint being tested (see Figure 3), through which the force F necessary for deformation testing (see 8.4) can be applied;The straps or cradles shall not have a detrimental effect on the test piece, e.g. point loads.4.2.3 Pipe supports, c
36、apable of supporting an arc of approximately 120 of the pipe barrel (see Figure 1, 2 and 3) for use as follows:2 ISO 2016 All rights reservedBS ISO 8639:2016ISO 8639:2016(E)a) support R, positioned at least 500 mm from the spigot end of the pipe at the point of balance (see Figure 3) to provide supp
37、ort during testing with deformation;b) supports, for the pipe components of the test piece (see 5.1 and Figure 1, Figure 2 and Figure 3). These can be used to apply angular deflection (see 8.3 and Figure 2). They shall allow deformation to occur (see 8.4, 8.5, 8.6 and Figure 3).4.2.4 Special support
38、s, if necessary to prevent buckling of the pipe barrel of low stiffness pipe during negative pressure testing.4.2.5 Special restraints, to provide support for the test assembly to prevent uncontrolled movements, particularly when testing at high pressures. Such supports shall be positioned in a mann
39、er so as to not influence the test being conducted and shall not induce point loads.Key1 thrust resisted by test rig2 test rig3 end cap or sealing device (e.g. joint)4 supports5 test joint6 drawL total effective lengthFigure 1 Test arrangement for total draw ISO 2016 All rights reserved 3BS ISO 8639
40、:2016ISO 8639:2016(E)Key1 thrust resisted by test rig2 test rig3 end cap or sealing device (e.g. joint)4 supports5 test joint6 total draw7 angular deflection between pipes and coupling8 angleL total effective lengthNOTE In order to prove that the angular deflection is between the centre lines of the
41、 pipe(s) and the coupling marks can be made on the pipes to check if there was a coupling rotation after the adjustment of the angular deflection.Figure 2 Test arrangement for angular deflection and draw4 ISO 2016 All rights reservedBS ISO 8639:2016ISO 8639:2016(E)Dimensions in millimetresKey1 thrus
42、t resisted by test rig2 test rig3 end cap or sealing device (e.g. joint)4 supports5 test joint6 draw7 strap, cradle or support (bottom)8 supportF force to be appliedL total effective lengthNOTE Figure 1, Figure 2 and Figure 3 show the loading on the test assembly applied in a vertical plane. This is
43、 the most common and practical orientation, particularly for large diameters. However, variations on this orientation may be used.Figure 3 Test arrangement for deformation and draw4.3 Means for applying the required force (see Clause 8) and a device to measure the force. The device shall be calibrat
44、ed to an accuracy of at least 5 % of the value to be measured.4.4 Source of hydrostatic pressure, capable of applying the required pressures including, as necessary, pressure cycling controls (see Table 1).4.5 Vacuum pump, capable of applying the required negative pressure (see 8.2.3 and Table 1).4.
45、6 Pressure gauges, capable of measuring the positive and negative pressures. The gauges shall be calibrated to an accuracy of at least 2 % of the value to be measured. The pressure shall be measured at the top of the pipe.5 Test pieces5.1 AssemblyThe test piece shall comprise an assembly of two piec
46、es of pipe of the same nominal size and pressure class, as specified in the referring standard, jointed by the socket/spigot, or double-socket, joint to be tested. In some cases it can be desired to test a transition coupling capable of joining two different nominal pipe sizes. In such a case both s
47、ides of the transition coupling shall satisfy the test requirements. ISO 2016 All rights reserved 5BS ISO 8639:2016ISO 8639:2016(E)The total effective length, L, (see Figure 1, Figure 2 and Figure 3) of the test piece shall be not less than that specified in the referring standard.The joint under te
48、st shall be assembled in accordance with the manufacturers recommendations.5.2 NumberUnless otherwise specified the number of test pieces shall be one.6 ConditioningUnless otherwise specified by the referring standard, following the assembly and filling, the filled test piece shall be conditioned by
49、 storing at the test temperature (see Clause 7) for at least 24 h prior testing until the required temperature is reached (medium and sample).NOTE Conditioning time is a function of pipe and joint wall thickness, water volume, temperature differential, the film heat transfer coefficient and whether the elevated temperature environment is applied to one or both sides of the specimen.7 Test temperatureConduct the following procedure in Clause 8 at the temperature specified in the referring standard.8 Procedur
