1、 Reference number ISO 7432:2002(E) ISO 2002INTERNATIONAL STANDARD ISO 7432 First edition 2002-07-15 Glass-reinforced thermosetting plastics (GRP) pipes and fittings Test methods to prove the design of locked socket-and- spigot joints, including double-socket joints, with elastomeric seals Tubes et r
2、accords en plastiques thermodurcissables renforcs de verre (PRV) Mthodes dessai pour confirmer la conception des assemblages mle-femelle verrouills, y compris ceux double emboture, avec joints dtanchit en lastomre ISO 7432:2002(E) PDF disclaimer This PDF file may contain embedded typefaces. In accor
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7、eneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2002 All rights reserved ISO 7432:2002(E) ISO 2002 All rights reserved iiiContents Page Foreword.iv Introduction.v 1 Scope 1 2 Principle1 3 Apparatus .2 4 Test pieces .2 5 Condit
8、ioning.3 6 Test temperature3 7 Procedure .3 8 Test report 8 Annex A (normative) Equations for calculating the force F 2and limiting deflection used in the bending test (7.5) .9 ISO 7432:2002(E) iv ISO 2002 All rights reserved Foreword ISO (the International Organization for Standardization) is a wor
9、ldwide 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 right to be represented on
10、 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. International Standards are drafted
11、in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standar
12、d 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 International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 7432 was
13、prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 6, Reinforced plastics pipes and fittings for all applications. Annex A forms a normative part of International Standard. ISO 7432:2002(E) ISO 2002 All rights reserved vIntrod
14、uction In a pipework system, pipes and fittings of different nominal pressures and nominal stiffnesses may be used. A joint may be made between pipes and/or fittings and should be designed such that its performance is equal to or better than the requirements for the pipeline, but not necessarily for
15、 the components being joined. The requirements for the 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 will be incorporated in the referri
16、ng specification. INTERNATIONAL STANDARD ISO 7432:2002(E) ISO 2002 All rights reserved 1Glass-reinforced thermosetting plastics (GRP) pipes and fittings Test methods to prove the design of locked socket-and-spigot joints, including double-socket joints, with elastomeric seals 1 Scope This Internatio
17、nal Standard specifies methods of test for joints with a locked socket and spigot, including double- socket joints, and with elastomeric seals, for buried and non-buried glass-reinforced thermosetting plastics (GRP) piping systems. This standard is applicable only to the joint, and specifies methods
18、 of test to prove its design. It assumes that the joint will be exposed to the effects of hydrostatic end thrust. The tests, detailed in 7.2 to 7.6, are applicable to locked socket-and-spigot joints intended to be used in buried or non-buried applications. With the exception of the bending test (7.5
19、), these tests are applicable to joints with pipes and fittings of all nominal sizes. The test detailed in 7.5 is applicable to joints with pipes and fittings up to and including DN 600. The tests are suitable for evaluating joints intended for applications in which liquids are conveyed at particula
20、r temperatures specified in the referring specification. 2 Principle A joint is subjected to a specified internal pressure. The methods include prolonged static tests at elevated pressures and cyclic testing. A method is included to test the joint for resistance to a pressure differential. This also
21、 simulates an external positive pressure. NOTE 1 The only reason for testing the joint for resistance to a pressure differential is to ensure adequate safety against infiltration of pollutants through the joint into the fluid carried in the piping system. Under the test conditions used, pipes with l
22、ow stiffness may require support to prevent buckling. A series of tests under bending is also included. At the end of each of the tests, the joint is inspected for signs of leakage and damage, and if either has occurred then the joint has failed. If the joint is to be used in systems where the maxim
23、um operating temperature is higher than the value given in the referring specification, the test conditions can be modified accordingly. NOTE 2 It is assumed that the following test parameters are set by the specification making reference to this standard: a) the total effective length L of the asse
24、mbled test piece (see 4.1); b) the number of test pieces to be used (see 4.2); c) if applicable, any conditioning other than as specified in clause 5; d) the test temperature and permissible deviations from it (see clause 6); e) the nominal pressure relevant to the joint under test (see 4.1 and clau
25、se 7 as well as the Introduction); ISO 7432:2002(E) 2 ISO 2002 All rights reserved f) if applicable, any criteria indicative of damage to the joint components see clause 7 and item h) in clause 8 ; g) the force F 1to be applied in the misalignment test (see 7.4); h) the acceptable increase in pressu
26、re over 1 h for a pressure-differential test (see 7.2). 3 Apparatus 3.1 End-sealing devices, of a size and type appropriate to the joint under test. The end-sealing devices shall be securely fixed to the pipes to transmit the end thrust loads to the pipes. 3.2 Supports 3.2.1 Straps or cradles, for u
27、se as follows: a) a support R (item 6 in Figure 2) positioned at least 500 mm from the spigot end of the pipe at the point of balance to provide support during testing with misalignment (see 7.4); b) a strap or cradle (100 5) mm wide (item 7 in Figure 2) supporting at least a 120 arc of the socket,
28、as required for misalignment testing (see 7.4); c) a strap or cradle (100 5) mm wide supporting a 180 arc of the pipe barrel, positioned adjacent to the end of the joint being tested (item 5 in Figure 2) and through which the force F 1necessary for misalignment testing (see 7.4) can be applied; d) s
29、upports of sufficient width to carry the pipe components of the test piece (item 3 in Figure 2) and designed in such a way that they allow misalignment to occur. The straps or cradles shall not have a detrimental effect on the test piece, e.g. by applying point loads. 3.2.2 Special supports, if nece
30、ssary to prevent buckling of the pipe barrel during misalignment (see 7.4) or pressure-differential (7.2) testing. Such supports shall be positioned in such a way that they do not affect the force F 1applied to the joint or the joints response to such a load. 3.3 Source of hydrostatic pressure, to m
31、eet the needs of the test. 3.4 Means of measuring the gauge pressure at the top of the pipe to an accuracy within 1 % and of checking conformity to the specified pressures (see 7.2.4, 7.2.6, 7.3.2, 7.4.4, 7.4.7, 7.4.10, 7.5.4, 7.5.5 and 7.6.1). 3.5 Vacuum pump or equivalent, capable of producing the
32、 required negative gauge pressure (see 7.2). 3.6 Means of applying and measuring the required misalignment and bending forces F 1and F 2(see 7.4 and 7.5) to an accuracy within 5 %. 4 Test pieces 4.1 Assembly and test arrangement The test piece shall comprise an assembly of two pieces of pipe of the
33、correct size and pressure class, as specified in the referring specification, between which is located the joint to be tested. ISO 7432:2002(E) ISO 2002 All rights reserved 3For the tests detailed in 7.2, 7.3 and 7.6, the arrangement shall be as shown in Figure 1. For the test detailed in 7.4, the a
34、rrangement shall be as shown in Figure 2. For the test detailed in 7.5, the arrangement shall be as shown in Figure 3. For the test in 7.5, see annex A for details on determining the maximum deflection (see Figure 3) at mid-span and the magnitude of the bending force F 2 . In the test in 7.5, the le
35、ngth L shall be not greater than 8 m. In all these arrangements, a joint of the same size and design shall be used. The same test piece may be used for more than one test procedure providing it is undamaged and of sufficient size to enable the test conditions to be achieved. The total effective leng
36、th L of the assembly shall be not less than that specified in the referring specification and shall allow, if required, the joint under test to be located in the middle of the test arrangement. The joint shall be assembled in accordance with the manufacturers recommendations and the requirements of
37、the referring specification. 4.2 Number of test pieces The number of test pieces shall be as specified in the referring specification. 5 Conditioning For any interval between assembly of the test pieces in accordance with clause 4 and conditioning performed in accordance with the following paragraph
38、 store the test pieces at temperatures which do not exceed the test temperature (see clause 6). Unless otherwise specified in the referring specification, following assembly condition the test pieces at the test temperature (see clause 6) for at least 24 h prior to testing. 6 Test temperature Condu
39、ct the following procedure at the temperature specified in the referring specification. 7 Procedure 7.1 General Subject a test piece (see clause 4) to the applicable tests in 7.2 to 7.6 (see Table 1 for a summary). NOTE Each reference to hydrostatic pressure specifies a positive internal gauge press
40、ure (i.e. relative to atmospheric pressure), and the nominal pressure is that relevant to the joint under test. If a test is interrupted, record the details in the test report and repeat the particular test before carrying on to the next, if applicable. Failure of the end-sealing devices or the pipe
41、 shall not constitute failure of the joint but, if the test conditions are invalidated thereby, repeat the particular test after replacing the failed component. 7.2 Leaktightness when subjected to a pressure differential 7.2.1 Assemble the test piece as shown in Figure 1, using supports (see 3.2) if
42、 appropriate. 7.2.2 Fix the end-sealing devices to the pipes. 7.2.3 Condition the test piece in accordance with clause 5. 7.2.4 Connect to the vacuum pump (3.5). ISO 7432:2002(E) 4 ISO 2002 All rights reserved 7.2.5 Reduce the pressure to at least 0,8 bar below atmospheric pressure (i.e. to approxim
43、ately 0,2 bar absolute). Record the pressure achieved. 7.2.6 Close the valve between the test piece and the vacuum pump and leave for 1 h. 7.2.7 At the end of this 1 h period, record any increase in pressure. 7.2.8 If an increase in pressure in excess of the acceptable level specified in the referri
44、ng specification see item h) in note 2 to clause 2 has occurred, then inspect for any sources of leakage. If any such sources are found in places other than the joint, return the test piece to atmospheric pressure, seal the sources of the leaks and repeat the test in 7.2.3. to 7.2.7. If such sources
45、 are found at the joint, stop the test and record the observations. 7.2.9 If an increase in pressure in excess of the acceptable level specified in the referring specification see item h) in note 2 to clause 2 has not occurred, then restore atmospheric pressure and inspect for any signs of damage to
46、 the joint see item f) in note 2 to clause 2. If signs of damage are found, stop the test and record the observations. Otherwise proceed to the next test. Key 1 Support (if required) 2 End-sealing device fixed to test piece 3 Thrust transmitted to test piece (will be negative in leaktightness test s
47、pecified in 7.2) 4 Test joint L Total effective length NOTE The arrangement may be used either horizontally (as shown) or vertically. Figure 1 Test arrangement for the tests detailed in 7.2, 7.3 and 7.6 7.3 Initial leakage 7.3.1 Assemble the test arrangement as shown in Figure 1, using supports if a
48、ppropriate (see 3.2). 7.3.2 Fix the end-sealing devices to the pipes. ISO 7432:2002(E) ISO 2002 All rights reserved 57.3.3 Condition the test piece in accordance with clause 5. 7.3.4 Fill the test piece with water and vent to remove any air. 7.3.5 Apply an internal pressure of 1,5 times the nominal
49、pressure of the joint, expressed in bars 1) , and maintain for 15 min (see Table 1). 7.3.6 Inspect the joint for signs of leakage or damage and record the observations. If no leakage or damage is found, proceed to the next test. Otherwise stop the test. 7.4 Misalignment with internal pressure and end thrust 7.4.1 Using a test piece conforming to clause 4, together with supports, straps or cradles (see 3.2) as appropriate, assemble the test arrangement as shown in Figure 2. Dimensions in millimetres Key 1
