ISO 7432:2002
(Main)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
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
This International 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 of test to prove its design. It assumes that the joint will be exposed to the effects of hydrostatic end thrust. The tests 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, these tests are applicable to joints with pipes and fittings of all nominal sizes. The bending test 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 particular temperatures.
Tubes et raccords en plastiques thermodurcissables renforcés de verre (PRV) — Méthodes d'essai pour confirmer la conception des assemblages mâle-femelle verrouillés, y compris ceux à double emboîture avec joints d'étanchéité en élastomère
General Information
Relations
Buy Standard
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 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 raccords en plastiques thermodurcissables renforcés de verre
(PRV) — Méthodes d'essai pour confirmer la conception des assemblages
mâle-femelle verrouillés, y compris ceux à double emboîture, avec joints
d'étanchéité en élastomère
Reference number
ISO 7432:2002(E)
©
ISO 2002
---------------------- Page: 1 ----------------------
ISO 7432:2002(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not
be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this
file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this
area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters
were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event
that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2002
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, without permission in writing from either ISO at the address below or ISO's 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 copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO 2002 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 7432:2002(E)
Contents Page
Foreword.iv
Introduction.v
1 Scope .1
2 Principle.1
3 Apparatus .2
4 Test pieces .2
5 Conditioning.3
6 Test temperature.3
7 Procedure .3
8 Test report .8
Annex A (normative) Equations for calculating the force F and limiting deflection used in the
2
bending test (7.5) .9
© ISO 2002 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 7432:2002(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 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 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 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
Standard 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 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.
iv © ISO 2002 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 7432:2002(E)
Introduction
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 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 manufacturer’s recommendations.
The material-dependent parameters and/or performance requirements will be incorporated in the referring
specification.
© ISO 2002 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 7432:2002(E)
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
1 Scope
This International 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 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), 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 particular 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 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 low
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 maximum 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 assembled 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 clause 7 as well as the Introduction);
© ISO 2002 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 7432:2002(E)
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 to be applied in the misalignment test (see 7.4);
1
h) the acceptable increase in pressure 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 use 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, 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 necessary for misalignment testing
1
(see 7.4) can be applied;
d) supports 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 necessary 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 applied to the joint or the joint’s response to such a load.
1
3.3 Source of hydrostatic pressure, to meet 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 required negative gauge pressure (see 7.2).
3.6 Means of applying and measuring the required misalignment and bending forces F and F (see 7.4
1 2
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 correct size and pressure class, as specified
in the referring specification, between which is located the joint to be tested.
2 © ISO 2002 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 7432:2002(E)
For 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 arrangement 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 . In the test in 7.5, the length L shall be not greater than 8 m. In
2
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 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.
The joint shall be assembled in accordance with the manufacturer's recommendations and the requirements of 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, 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 t
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.