ISO 8533:2019

INTERNATIONAL ISO
STANDARD 8533
Second edition
2019-08
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 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 End sealing devices . 2
5.1.1 General. 2
5.1.2 Capable of applying the end loads . 3
5.1.3 Not capable of applying the end loads . 3
5.2 Supports . 3
5.2.1 End thrust supports . 3
5.2.2 Straps or cradles. 3
5.2.3 Special supports . 3
5.3 Source of hydrostatic pressure . 3
5.4 Means of measuring the gauge pressure . 3
5.5 Vacuum pump . 3
5.6 Means for applying the required bending force . 3
6 Test pieces . 3
6.1 Test arrangement for tests detailed in 9.2, 9.4 and 9.5 . 3
6.2 Test arrangement for tests detailed in 9.3 . 4
6.3 Number of test pieces . 6
7 Conditioning . 6
8 Test temperature . 6
9 Procedure. 6
9.1 General . 6
9.2 Negative pressure . 7
9.3 Resistance to bending with pressure and end thrust . 8
9.3.1 Method A . 8
9.3.2 Method B . 8
9.4 Resistance to internal cyclic pressure . 9
9.5 Resistance to maintained internal pressure .10
9.6 Resistance to bolt-tightening torque .10
10 Test report .10
Annex A (normative) Calculation of the additional force F and limiting deflection Δ used in
A
9.3, Method A .12
Annex B (normative) Calculation of the bending load F used in 9.3, Method B .13
B
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
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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
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This document 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.
This second edition cancels and replaces the first edition ISO 8533:2003, which has been technically
revised. It also incorporates the Amendment ISO 8533:2003/Amd1: 2012. The main changes compared
to the previous edition are as follows:
— changed the Scope to mention that the test procedure is a destructive test and that the bending test
is limited up to DN 600;
— changed the Scope to cover the proof of structural design of cemented or wrapped joints;
— the Terms and definitions clause was added to this document;
— changed testing sequences from mandatory to recommended;
— modified test sequence for the proof of the design, Clause 9;
— changes in Table 1 with modified testing sequences for the proof of the design of cemented or
wrapped joints;
— modification of bending test sequence;
— addition of an alternative bending test (Method B).
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved

Introduction
In a pipework system, pipes and fittings of different nominal pressures and nominal 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 document, but they should be in
accordance with the manufacturer’s recommendations.
The material-dependent parameters and/or performance requirements are stated in the referring
standard.
INTERNATIONAL STANDARD ISO 8533:2019(E)
Glass-reinforced thermosetting plastics (GRP) pipes and
fittings — Test methods to prove the design of cemented or
wrapped joints
1 Scope
This document specifies methods of test for cemented or wrapped joints for buried and above ground
glass-reinforced thermosetting plastics (GRP) piping systems. This document 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 9.2, 9.4 to 9.6 inclusive are applicable to cemented or wrapped joints intended to
be used in buried or above-ground applications. The bending tests detailed in 9.3 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 procedure detailed in 9.3, these test procedures are applicable to joints for pipes
and fittings of all nominal sizes. The tests detailed in 9.3 are applicable to joints for pipes and fittings
up to and including DN 600. The tests are applicable for evaluating joints intended for applications
conveying liquids at temperatures specified in the referring standards.
The test procedures in this document are damaging to the test piece, which will not be suitable for
reuse after these tests. The test procedure is applied for type testing purposes only.
This document is applicable only to the joint and specifies methods of test to prove its design.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
pressure
hydrostatic gauge pressure
Note 1 to entry: Expressed in bar.
3.2
bending
beam bending in the pipe and joint configuration as a result of a vertical force on the cemented or
wrapped joint
4 Principle
A test p
...