1、 Reference number ISO 8533:2003(E) ISO 2003INTERNATIONAL STANDARD ISO 8533 First edition 2003-12-01 Glass-reinforced thermosetting plastics (GRP) pipes and fittings Test methods to prove the design of cemented or wrapped joints Tubes et raccords en plastiques thermodurcissables renforcs de verre (PR
2、V) Mthodes dessai pour confirmer la conception des assemblages scells ou enrobs ISO 8533:2003(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 embedded
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5、relating to it is found, please inform the Central Secretariat at the address given below. ISO 2003 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, including photocopying and microfilm,
6、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 Published in Switzerland ii ISO 2003 All
7、 rights reservedISO 8533:2003(E) ISO 2003 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Principle . 1 3 Apparatus. 2 4 Test pieces. 4 4.1 Test arrangement 4 4.2 Number of test pieces. 4 5 Conditioning 4 6 Test temperature . 4 7 Procedure. 4 7.1 General. 4 7.2 Leaktightn
8、ess when subjected to an external pressure differential . 5 7.3 Initial leakage. 5 7.4 Resistance of the joint to bending and pressure 5 7.5 Resistance to internal pressure 6 7.6 Testing excluding hydrostatic end thrust (see 7.1). 7 8 Test report 7 Annex A (normative) Equations for calculating the a
9、dditional force, F, and limiting deflection, , for the bending test described in 7.4 9 ISO 8533:2003(E) iv ISO 2003 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing I
10、nternational 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 that committee. International organizations, governmental and non-governmental, in liaison
11、 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 in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of tech
12、nical 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 Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is draw
13、n 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. ISO 8533 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of flui
14、ds, Subcommittee SC 6, Reinforced plastics pipes and fittings for all applications. ISO 8533:2003(E) ISO 2003 All rights reserved vIntroduction In a pipework system, pipes and fittings of different nominal pressures and stiffness may be used. A joint may be made between pipes and/or fittings and sho
15、uld 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 the assembly of the joint are not included in this standard, but they should be in accordance with the manufacturers recomme
16、ndations. INTERNATIONAL STANDARD ISO 8533:2003(E) ISO 2003 All rights reserved 1Glass-reinforced thermosetting plastics (GRP) pipes and fittings Test methods to prove the design of cemented or wrapped joints 1 Scope This International Standard specifies methods of test for cemented or wrapped joints
17、 for plastics piping systems made of glass-reinforced thermosetting plastics (GRP) for buried and non-buried pipelines. This standard is only applicable to the joint and covers methods of test to prove its design. It assumes that the joint either is or is not intended to be subject to the effects of
18、 hydrostatic end thrust. The tests detailed in 7.1 to 7.6 inclusive are applicable to cemented or wrapped joints intended to be used in either buried or non-buried applications. The bending tests detailed in 7.4 can be used to prove the design where joints are either intended to be used in buried ap
19、plications or are intended to be used in particular above-ground situations where the tests may be considered appropriate. With the exception of 7.4 these test procedures are applicable to joints between pipes and fittings of all nominal sizes. The tests detailed in 7.4 are applicable to joints betw
20、een pipes and fittings up to and including DN 600. The tests are applicable to the evaluation of joints intended for the conveyance of liquids at temperatures specified in the referring standards (see Clause 2). 2 Principle A joint is subjected to a specified internal pressure and, if applicable, lo
21、ngitudinal loading. The procedure includes prolonged static tests at elevated pressures and cyclic testing. A joint is subjected to a specified internal negative pressure. This also simulates an external positive pressure. NOTE 1 The only reason for testing the resistance to external pressure differ
22、ential is to ensure adequate safety against infiltration of pollutants through the joint into the fluid carried in the piping system. Under these test conditions pipes with low stiffness may require support to prevent buckling. A series of tests that are performed under bending is included. At the e
23、nd of each of the tests the joint is inspected for signs of leakage and damage and, unless otherwise specified, if either has occurred then the joint has failed. If the joint is to be used in systems where the maximum operating temperature is higher than the value given in the referring standard the
24、 test conditions can be modified accordingly. NOTE 2 It is assumed that the following test parameters are set by the standard making reference to this standard: a) length, L, of the assembled test piece (see 4.1); b) number of test pieces to be used (see 4.2); c) if applicable, conditioning other th
25、an as given in Clause 5; d) test temperature and its permissible deviations (see Clause 6); ISO 8533:2003(E) 2 ISO 2003 All rights reservede) nominal pressure relevant to the joint under test (see 4.1 and Clause 7, as well as the introduction to this standard); f) if applicable, any criteria indicat
26、ive of damage to the joint components see Clause 7 and item j) of Clause 8; g) whether the joint is or is not to be tested with end loads; h) acceptable increase in pressure over 1 h for an external pressure differential test (see 7.2). 3 Apparatus 3.1 End-sealing devices End-sealing devices shall b
27、e of a size and type appropriate to the joint system under test. 3.1.1 Capable of applying the end loads If the joint is to be tested with the end load see item g) of Note 2 of Clause 2 then the end-sealing devices shall be anchored to the pipes to transmit the end thrust loads. 3.1.2 Not capable of
28、 applying the end loads If the joint is to be tested without the end load see item g) of Note 2 of Clause 2 and 7.6 then the end-sealing devices shall not be anchored to the pipes. 3.2 Supports 3.2.1 End thrust supports If required, the end thrust supports shall comprise part of the rig and shall be
29、 capable of supporting the end thrust induced by the internal pressure but shall not otherwise support the joint see 7.6 and Figure 1b), item 3. 3.2.2 Straps and cradles Straps or cradles for use as supports shall be of sufficient width for the pipe components of the test piece (see Figure 2) and sh
30、all not have a detrimental effect on the test piece, e.g. shall not apply point loads. 3.2.3 Special supports Special supports may be used to prevent buckling of the pipe barrel during external pressure differential testing (see 7.2). 3.3 Source of hydrostatic pressure A source of hydrostatic pressu
31、re capable of meeting the needs of the test. 3.4 Means of measuring the gauge pressure A means of measuring the gauge pressure at the top of the pipe to an accuracy within 1 % and checking conformity to the specified pressures (see 7.2, 7.3, 7.4 and 7.5). 3.5 Vacuum pump or equivalent A vacuum pump
32、or equivalent capable of applying the required negative gauge pressure (see 7.2). ISO 8533:2003(E) ISO 2003 All rights reserved 3a) Arrangement with end loads b) Arrangement without end loads Key 1 thrust carried by test piece 4 joint being tested 2 end-sealing device L length of the assembly 3 thru
33、st carried by test rig Figure 1 Typical test arrangements for the tests detailed in 7.2, 7.3 and 7.5 ISO 8533:2003(E) 4 ISO 2003 All rights reserved4 Test pieces 4.1 Test arrangement The test piece shall comprise an assembly of two pieces of pipe of the correct size and pressure class, as specified
34、in the referring standard, between which is located the joint to be tested. For the tests detailed in 7.2, 7.3 and 7.5, the length of the assembly, L, 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 o
35、f the test arrangement. For the test detailed in 7.4 the length, L, of the assembly shall be not greater than 8 m and the joint under test shall be located in the middle of the test arrangement. For the tests detailed in 7.2, 7.3 and 7.5, the arrangement shall be as shown in Figure 1. For the test d
36、etailed in 7.4, the arrangement shall be as shown in Figure 2. For the tests detailed in 7.4, see Annex A for details on determining the maximum deflection, (see item 6 in Figure 2), at mid-span and the magnitude of the force F. In all these arrangements a joint of the same size and design shall be
37、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 joint shall be assembled in accordance with the manufacturers recommendations and the requirements of the referring standard. 4.2
38、Number of test pieces The number of test pieces shall be as specified in the referring standard. 5 Conditioning For any interval between assembly of the test piece in accordance with Clause 4 and conditioning performed in accordance with the following paragraph, store the test piece at a temperature
39、 which does not exceed the test temperature (see Clause 6). Following assembly, unless otherwise specified in the referring standard, condition test pieces by storing at the test temperature (see Clause 6) for at least 24 h prior to testing. 6 Test temperature Conduct the following procedures at the
40、 temperature specified in the referring standard. 7 Procedure 7.1 General WARNING When carrying out the procedures detailed in this clause, care should be taken to provide suitable protection from flying objects resulting from catastrophic failure. Subject the test piece (see Clause 4) to either the
41、 tests in 7.2 to 7.5 summarized in Table 1, for joints intended to carry end thrust, or the tests detailed in 7.6 summarized in Table 1 for joints not intended to carry end thrust. In either case for the tests detailed in 7.4 the test piece shall have a length not exceeding 8 m and use a joint of th
42、e same size and design as that used for 7.2, 7.3 and 7.5. NOTE Each reference to hydrostatic pressure specifies a positive internal gauge pressure (i.e. relative to atmospheric pressure) and the nominal pressure is that relevant to the joint under test. ISO 8533:2003(E) ISO 2003 All rights reserved
43、5If a test is interrupted, record the details in the test report and repeat the particular test before carrying on to the next in the series of tests, if applicable. Failure at the end caps or of the pipe shall not constitute failure of the joint but, if the test conditions are invalidated thereby,
44、repeat the particular test after replacing the failed component. 7.2 Leaktightness when subjected to an external pressure differential 7.2.1 Assemble the test arrangement as shown in Figure 1a) and condition as described in Clause 5. 7.2.2 Connect to the vacuum pump (see 3.5). 7.2.3 Reduce the press
45、ure to at least 0,8 bar below atmospheric pressure (approximately 0,2 bar absolute). Record the pressure achieved. 7.2.4 Close the valve between the test piece and the vacuum pump and leave for 1 h. 7.2.5 After this time record any increase in pressure. 7.2.6 If an increase in pressure in excess of
46、the acceptable level specified in the referring standard see item h) of Note 2 to Clause 2 has occurred then inspect for sources of leakage other than the joint. If any such sources are found then return the test piece to atmospheric pressure, seal the source of the leaks and repeat the test in 7.2.
47、2 to 7.2.5. Otherwise stop the test and record the observations. 7.2.7 If an increase in pressure in excess of the acceptable level specified in the referring standard see item h) of Note 2 to Clause 2 has not occurred then restore atmospheric pressure and inspect for and record any signs of damage
48、to the joint see item f) of Note 2 to Clause 2 and proceed to the next test. 7.3 Initial leakage 7.3.1 Fill the test piece with water and vent to remove any air. 7.3.2 Apply an internal pressure of 1,5 times the nominal pressure of the joint, expressed in bars 1) , and maintain within 2 % for 15 min
49、 (see Table 1). 7.3.3 Inspect the joint for signs of leakage or damage. If neither are present proceed to the next test. Otherwise stop the test and record the observations. 7.4 Resistance of the joint to bending and pressure 7.4.1 Assemble the test arrangement as shown in Figure 2 using a test piece conforming to Clause 4 and having a length L not exceeding 8 m. Determine the values of F and in accordance with Annex A. 7.4.2 Connect the end caps to the pipes in such a way that the full loads induced by the in
