ISO 8483-2003 Plastics piping systems for pressure and non-pressure drainage and sewerage - Glass-reinforced thermosetting plastics (GRP) pipes and fittings - T.pdf

1、 Reference number ISO 8483:2003(E) ISO 2003INTERNATIONAL STANDARD ISO 8483 First edition 2003-12-01 Glass-reinforced thermosetting plastics (GRP) pipes and fittings Test methods to prove the design of bolted flange joints Tubes et raccords en plastiques thermodurcissables renforcs de verre (PRV) Mth

2、odes dessai pour confirmer la conception des assemblages brides boulonnes ISO 8483:2003(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 are l

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5、ng 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, withou

6、t 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 right

7、s reservedISO 8483:2003(E) ISO 2003 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Principle . 1 3 Apparatus. 2 3.1 End-sealing devices 2 3.2 Supports. 2 3.3 Source of hydrostatic pressure. 2 3.4 Means of measuring the gauge pressure.2 3.5 Vacuum pump or equivalent 2 3.6

8、 Bolt torque test apparatus . 2 4 Test pieces. 3 4.1 Test arrangement 3 4.2 Number of test pieces. 4 5 Conditioning 4 6 Test temperature . 4 7 Procedures 4 7.1 General. 4 7.2 Leaktightness when subjected to an external pressure differential . 5 7.3 Initial leakage. 5 7.4 Resistance to internal press

9、ure 7 7.5 Resistance of the joint to bending and pressure including hydrostatic end thrust 7 7.6 Short-duration resistance to internal pressure including hydrostatic end thrust . 8 7.7 Resistance to bolt-tightening torque 9 7.8 Testing excluding hydrostatic end thrust (see 7.1). 9 8 Test report 9 An

10、nex A (normative) Equations for calculating the additional force, F, and limiting deflection, , for the bending test described in 7.5 11 ISO 8483:2003(E) iv ISO 2003 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards b

11、odies (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 that committee. International organizati

12、ons, 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 in accordance with the rules given in the

13、 ISO/IEC Directives, Part 2. 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 Standard requires approval by at least 75 % of t

14、he member bodies casting a vote. 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 or all such patent rights. ISO 8483 was prepared by Technical Committee ISO/TC 138, Plastics pi

15、pes, fittings and valves for the transport of fluids, Subcommittee SC 6, Reinforced plastics pipes and fittings for all applications. ISO 8483:2003(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

16、 may be made between pipes and/or fittings and 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 the assembly of the joint are not included in this standard, but they shou

17、ld be in accordance with the manufacturers recommendations. INTERNATIONAL STANDARD ISO 8483:2003(E) ISO 2003 All rights reserved 1Glass-reinforced thermosetting plastics (GRP) pipes and fittings Test methods to prove the design of bolted flange joints 1 Scope This International Standard specifies me

18、thods of test for bolted flange joints for plastics piping systems made of glass-reinforced thermosetting plastics (GRP). 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

19、 of hydrostatic end thrust. These test procedures are applicable to joints betwen pipes and fittings of all nominal sizes. The tests are applicable for evaluating joints intended for applications conveying liquids at temperatures specified in the referring specifications. 2 Principle A joint is subj

20、ected to a specified internal pressure and, if appropriate for the joint design, the consequent hydrostatic end thrust. The procedure includes prolonged static tests at elevated pressures and cyclic testing. A method is also included to test the resistance of the joint to an internal negative pressu

21、re. This also simulates an external positive pressure. NOTE 1 The only reason for testing the resistance to external pressure differential 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

22、 with low stiffness may require support to prevent buckling. At the end 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 tem

23、perature 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 standard making reference to this standard: a) length, L, of the assembled test piece (see 4.1); b) number o

24、f test pieces to be used (see 4.2); c) if applicable, conditioning other than as given in Clause 5; d) test temperature and its permissible deviations (see Clause 6); e) nominal pressure relevant to the joint under test (see 4.1 and Clause 7); f) if applicable, any criteria indicative of damage to t

25、he 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; ISO 8483:2003(E) 2 ISO 2003 All rights reservedh) whether GRP to GRP or GRP to metal flange tests are to be performed (see Clause 4); i) acceptable increase in pressure over 1 h f

26、or negative pressure test (see 7.2). 3 Apparatus 3.1 End-sealing devices The end-sealing devices shall be of a size and type appropriate to the joint system under test and shall conform to 3.1.1 or 3.1.2 as applicable. 3.1.1 Capable of applying the end loads If the joint is to be tested with an end

27、load see item g) of Note 2 to 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 applying the end loads If the joint is to be tested without the end load see item g) of Note 2 to Clause 2 then the end-sealing devices shall not

28、be anchored to the pipes (see 7.6). 3.2 Supports 3.2.1 End thrust supports, if required, comprising part of the rig, which shall be capable of supporting the end thrust induced by the internal pressure, but which shall not otherwise support the joint. 3.2.2 Special supports, if necessary, to prevent

29、 buckling of the pipe barrel during external pressure differential (see 7.2) testing. 3.3 Source of hydrostatic pressure A source of hydrostatic pressure 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

30、 to an accuracy within 1 % and checking conformity to the specified pressures (see 7.2 to 7.4). 3.5 Vacuum pump or equivalent A vacuum pump or equivalent capable of applying the required negative gauge pressure (see 7.2). 3.6 Bolt torque test apparatus The bolt torque test apparatus shall incorporat

31、e the following items: a) a flat-faced metallic flange of the same mating dimensions as the GRP flange; b) a calibrated wrench with means of measuring the torque applied; c) bolts, nuts and washers for assembling the metallic flange to the flange under test. ISO 8483:2003(E) ISO 2003 All rights rese

32、rved 34 Test pieces 4.1 Test arrangement When testing in accordance with 7.2 to 7.4 and 7.6 the test arrangement shall be one of those shown in Figure 2a). When testing in accordance with 7.8 the test arrangement shall be one of those shown in Figure 2b). It should be noted that there are two differ

33、ent joint conditions shown, namely metallic flange to GRP flange and GRP flange to GRP flange. These two conditions will not necessarily give the same results due to different stresses and strains being induced. The referring specification shall state which condition is to be used. For the test deta

34、iled in 7.5 the arrangement shall be as shown in Figure 3. See Annex A for details on determining the maximum deflection, (see item 6 in Figure 3), at mid-span and the magnitude of the additional force, F (see Annex A). In all these arrangements a joint of the same size and design shall be used. The

35、 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 test piece shall comprise an assembly of one or two pieces of pipe of the same size and pressure class as the joint being tested, and the j

36、oint to be tested. The total effective length, 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. For the test detailed in 7.5 the length, L, of the assembly s

37、hall be not greater than 8 m and the joint under test shall be located in the middle of the test arrangement. The joint shall be assembled in accordance with the manufacturers recommendations, including gasket type (inside bolt circle or full face), gasket material, bolt and nut lubrication and, if

38、applicable, the requirements of the referring specification. Conditioning, in accordance with Clause 5, shall commence immediately after assembly of a test joint. Key 1 metal blank flange L flength of flange 2 GRP flange and over-wrapping L plength of pipe 3 gasket Figure 1 Typical test arrangement

39、for tests detailed in 7.7 ISO 8483:2003(E) 4 ISO 2003 All rights reservedFor bolt torque testing (see 7.7 and Figure 1) the test piece shall comprise a GRP flange joined to a GRP pipe having a length L pnot less than the value derived from Equation (1). The GRP flange is assembled to a metallic flan

40、ge using bolts and a gasket. () 0,5 pf 3, 3 DN L eL =+ (1) where DN is the nominal size of the pipe, when expressed in millimetres; e is the wall thickness of the pipe, expressed in millimetres; L fis the length of the flange from the flange face to the end of any wrapping, expressed in millimetres;

41、 L pis the minimum length of the pipe, expressed in millimetres. Conditioning, in accordance with Clause 5, shall commence immediately after assembly of a test joint. NOTE Overtightening of the bolts can result in damage to the flange. 4.2 Number of test pieces The number of test pieces shall be as

42、specified in the referring specification. 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 which does not exceed the test temperature (see Clause

43、 6). Following assembly, unless otherwise specified in the referring specification, condition the test piece by storing at the test temperature (see Clause 6) for (24 2) h prior to performing any of the procedures in Clause 7. NOTE The conditioning period starts when the individual parts of the test

44、 piece (see Clause 4) have been joined. 6 Test temperature Conduct the following procedures at the temperature specified in the referring specification. 7 Procedures 7.1 General WARNING When carrying out the procedures detailed in this clause, care should be taken to provide suitable protection from

45、 flying objects resulting from catastrophic failure. Subject each test piece (see Clause 4) to those of the following tests specified in the referring specification and summarised in Table 1 that are either detailed in 7.2 to 7.6 for joints intended to carry end thrust, or 7.8 for joints not intende

46、d to carry end thrust. In either case for the tests detailed in 7.5 the test piece shall have a length not exceeding 8 m and use a joint of the same size and design as that used for 7.2 to 7.4 and 7.6. Carry out the procedures without any retightening of the bolts except as specified e.g. to replace

47、 a failed component, or to test in accordance with 7.7. ISO 8483:2003(E) ISO 2003 All rights reserved 5NOTE 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. I

48、f 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-sealing devices or the pipe shall not constitute failure of the joint but, if the test conditions are invalidated the

49、reby, repeat the particular test after replacing the failed component. 7.2 Leaktightness when subjected to an external pressure differential 7.2.1 Using a test piece conforming to Clause 4, assemble the test arrangement as shown in Figure 2a), using supports (see 3.2) as appropriate. 7.2.2 Connect the end-sealing devices (see 3.1.1) to the pipes in such a way that the full loads induced by the internal pressure will be transmitted along the pipes to the joint under test. 7.2.3 Condition the test piece in accordance w