1、BSI Standards Publication BS ISO 8639:2016 Glass-reinforced thermosetting plastics (GRP) pipes and fittings Test methods for leaktightness and proof of structural design of flexible jointsBS ISO 8639:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 8639:2
2、016. The UK participation in its preparation was entrusted to Technical Committee PRI/88/2, Plastics piping for pressure applications. 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 pro
3、visions of a contract. Users are responsible for its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 84932 9 ICS 23.040.60 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was p
4、ublished under the authority of the Standards Policy and Strategy Committee on 29 February 2016. Amendments issued since publication Date Text affectedBS ISO 8639:2016 ISO 2016 Glass-reinforced thermosetting plastics (GRP) pipes and fittings Test methods for leaktightness and proof of structural des
5、ign of flexible joints Tubes et raccords en plastiques thermodurcissables renforcs de verre (PRV) Mthodes dessai pour ltanchit et preuve de conception structurelle de joint flexible INTERNATIONAL STANDARD ISO 8639 Second edition 2016-02-15 Reference number ISO 8639:2016(E)BS ISO 8639:2016ISO 8639:20
6、16(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in Switzerland All 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
7、posting on the internet or an intranet, 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 office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 F
8、ax +41 22 749 09 47 copyrightiso.org www.iso.orgBS ISO 8639:2016ISO 8639:2016(E)Foreword iv Introduction v 1 Scope . 1 2 Terms and definitions . 1 3 Principle 1 4 Apparatus . 2 4.1 End-sealing devices. 2 4.2 Supports and restraints . 2 5 Test pieces . 5 5.1 Assembly 5 5.2 Number 6 6 Conditioning 6 7
9、 Test temperature 6 8 Procedure. 6 8.1 General . 6 8.2 Negative pressure . 6 8.3 Simultaneous angular deflection and draw . 7 8.4 Simultaneous draw and deformation 7 8.5 Cyclic pressure 8 8.6 Positive static pressure 8 9 Test report . 9 ISO 2016 All rights reserved iii Contents PageBS ISO 8639:2016I
10、SO 8639:2016(E) 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 through ISO technical committees. Each member body interested in a subje
11、ct 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 Commission (IEC
12、) 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 approval criteria needed for the different types of ISO documents should be n
13、oted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives 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
14、 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. www.iso.org/patents Any trade name used in this document is information given for the convenience of users an
15、d 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 in the Technical Barriers to Trade (TBT), see the following URL: Foreword - Supplementary
16、information The committee responsible for this document is ISO/TC 138, 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 ha
17、s been technically revised. The modifications are: changed title and scope 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 d
18、eformation; clarified support conditions; additional test sequence for the 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) Introdu
19、ction In a pipework system, pipes and fittings of different nominal pressures 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 bein
20、g joined. The requirements for assembly of the joint are not included in this 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 rig
21、hts reserved vBS ISO 8639:2016BS ISO 8639:2016Glass-reinforced thermosetting plastics (GRP) pipes and fittings Test methods for leaktightness and proof of structural design of flexible joints 1 Scope This International Standard specifies test methods for flexible non-thrust resistant socket-and-spig
22、ot joints with elastomeric sealing elements for buried and above ground glass-reinforced 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 (d
23、raw), angular movement (angular deflection), compression (deformation) perpendicular 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 ar
24、e subjected to conditions which measure their ability to function and thereby prove 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
25、 applications in which the liquids are conveyed at temperatures specified in the referring 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 purpose
26、s. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 pressure hydrostatic gage pressure 2.2 angular deflection angle between the axes of the joint and the consecutive pipe(s), expressed in degrees () 2.3 draw longitudinal movement of the pipe r
27、elative to the socket (joint), expressed in millimetres (mm) 2.4 total draw sum of the draw, and the additional longitudinal movement, of joint components due to the presence of angular deflection, expressed in millimetres (mm) 2.5 deformation pipe deformation in the coupling as a result of a vertic
28、al force on the pipe and a supported coupling causing a step between the two pipe spigots at the loading position in millimeters (mm) 3 Principle A test piece comprising two pieces of pipe jointed together, by incorporation of a socket or inclusion of a double-socket coupler, is subjected to specifi
29、ed combinations of draw, angular deflection and INTERNATIONAL ST ANDARD ISO 8639:2016(E) ISO 2016 All rights 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 int
30、ernal sub-atmospheric test pressure. In addition, a test at elevated positive static pressure is conducted 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. NO
31、TE It is assumed that the following test parameters are set by the standard making reference to this International 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 (se
32、e 5.1); the number of test pieces (see 5.2); if applicable, the conditioning to be applied (see Clause 6); 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 per
33、missible change in negative pressure (see 8.2.3). 4 Apparatus 4.1 End-sealing devices End sealing devices, of 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 restraints 4.2.1 Longitudinal supports,
34、 capable of supporting the end thrust induced by the internal pressure but which shall not otherwise support the 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
35、: a) a strap, cradle or support, to support the socket on a fixed base, as required for deformation testing (see 8.4); 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;
36、The straps or cradles shall not have a detrimental effect on the test piece, e.g. point loads. 4.2.3 Pipe supports, capable 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) suppor
37、t R, positioned at least 500 mm from the spigot end of the pipe at the point of balance (see Figure 3) to provide support 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 deflecti
38、on (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 supports, 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
39、 prevent uncontrolled movements, particularly when testing at high pressures. Such supports shall be positioned in a manner so as to not influence the test being conducted and shall not induce point loads. Key 1 thrust resisted by test rig 2 test rig 3 end cap or sealing device (e.g. joint) 4 suppor
40、ts 5 test joint 6 draw L total effective length Figure 1 Test arrangement for total draw ISO 2016 All rights reserved 3BS ISO 8639:2016ISO 8639:2016(E) Key 1 thrust resisted by test rig 2 test rig 3 end cap or sealing device (e.g. joint) 4 supports 5 test joint 6 total draw 7 angular deflection betw
41、een pipes and coupling 8 angle L total effective length NOTE In order to prove that the angular deflection is between the centre lines of the 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 Tes
42、t arrangement for angular deflection and draw4 ISO 2016 All rights reservedBS ISO 8639:2016ISO 8639:2016(E) Dimensions in millimetres Key 1 thrust resisted by test rig 2 test rig 3 end cap or sealing device (e.g. joint) 4 supports 5 test joint 6 draw 7 strap, cradle or support (bottom) 8 support F f
43、orce to be applied L total effective length NOTE Figure 1, Figure 2 and Figure 3 show the loading on the test assembly applied in a vertical plane. This is the most common and practical orientation, particularly for large diameters. However, variations on this orientation may be used. Figure 3 Test
44、arrangement for deformation and draw 4.3 Means for applying the required force (see Clause 8) and a device to measure the force. The device shall be calibrated 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 i
45、ncluding, 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). 4.6 Pressure gauges, capable of measuring the positive and negative pressures. The gauges shall be calibrated to an accuracy of at least 2 % o
46、f the value to be measured. The pressure shall be measured at the top of the pipe. 5 Test pieces 5.1 Assembly The test piece shall comprise an assembly of two pieces of pipe of the same nominal size and pressure class, as specified in the referring standard, jointed by the socket/spigot, or double-s
47、ocket, 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 sides of the transition coupling shall satisfy the test requirements. ISO 2016 All rights reserved 5BS ISO 8639:2016ISO 8639:2016(E) The t
48、otal 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 test shall be assembled in accordance with the manufacturers recommendations. 5.2 Number Unless otherwise specified the number of test pi
49、eces shall be one. 6 Conditioning Unless otherwise specified by the referring standard, following the assembly and filling, the filled test piece shall be conditioned by 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 tempera
