ISO 8533:2003

INTERNATIONAL ISO
STANDARD 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 renforcés de verre
(PRV) — Méthodes d'essai pour confirmer la conception des
assemblages scellés ou enrobés




Reference number
ISO 8533:2003(E)
©
ISO 2003

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ISO 8533:2003(E)
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ii © ISO 2003 — All rights reserved

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ISO 8533:2003(E)
Contents 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 Leaktightness 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 additional force, F, and limiting deflection, ∆,
for the bending test described in 7.4 . 9

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ISO 8533:2003(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 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 the 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 8533 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.

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ISO 8533:2003(E)
Introduction
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 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 should be in
accordance with the manufacturer’s recommendations.

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INTERNATIONAL STANDARD ISO 8533:2003(E)

Glass-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 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 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 applications 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 between 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, longitudinal 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 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 with
low stiffness may require support to prevent buckling.
A series of tests that are performed under bending is included.
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 temperature is higher than the value given
in the referring standard 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 of 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);
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ISO 8533:2003(E)
e) 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 indicative 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 be 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 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 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 shall 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 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 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 or equivalent capable of applying the required negative gauge pressure (see 7.2).
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ISO 8533:2003(E)


a)  Arrangement with end loads b)  Arrangement without end loads
Key
1 thrust carried by test piece 4 joint being tes
...