ISO 8639:2016

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 8639
ISO/TC 138/SC 6
Glass-reinforced thermosetting
Secretariat: ASI
plastics (GRP) pipes and fittings — Test
Voting begins on:
2015­10­27 methods for leaktightness and proof of
structural design of flexible joints
Voting terminates on:
2015­12­27
Tubes et raccords en plastiques thermodurcissables renforcés de verre
(PRV) — Méthodes d’essai pour l’étanchéité et preuve de conception
structurelle de joint flexible
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 8639:2015(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2015

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ISO/FDIS 8639:2015(E)

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ISO/FDIS 8639:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Terms and definitions . 1
3 Principle . 1
4 Apparatus . 2
4.1 End­sealing devices. 2
4.2 Supports and restraints . 2
5 Test pieces . 5
5.1 Assembly . 5
5.2 Number . 6
6 Conditioning . 6
7 Test temperature . 6
8 Procedure. 6
8.1 General . 6
8.2 Negative pressure . 6
8.3 Simultaneous angular deflection and draw . 7
8.4 Simultaneous draw and deformation . 7
8.5 Cyclic pressure . 8
8.6 Positive static pressure . 8
9 Test report . 9
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ISO/FDIS 8639:2015(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 non­governmental, 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.
The procedures used to develop this document and those intended for its further maintenance are
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
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
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For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT), see the following URL: Foreword - Supplementary information
The committee responsible for this document is 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 8639:2000), which has been technically
revised. The modifications are:
— changed title and scope to cover the proof of structural design of flexible joints;
— changed scope to mention that the test procedure is a destructive test;
— changed testing sequences from mandatory to suggested;
— changed wording from misalignment to deformation;
— clarified support conditions;
— additional test sequence for the proof of the structural design (Clause 8);
— changes in Table 1 with additional testing sequences for the proof of the structural design of
flexible joints;
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ISO/FDIS 8639:2015(E)

Introduction
In a pipework system, pipes and fittings of different nominal pressures and stiffnesses may be used.
Any joint made between pipes and/or fittings 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 assembly of the joint are not included in this International Standard, but they
should be in accordance with the manufacturer’s recommendations.
The material­dependent parameters and/or performance requirements are stated in the referring
specification.
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 8639:2015(E)
Glass-reinforced thermosetting plastics (GRP) pipes and
fittings — Test methods for leaktightness and proof of
structural design of flexible joints
1 Scope
This International Standard specifies test methods for flexible non-thrust resistant socket-and-spigot
joints with elastomeric sealing elements for buried and above ground glass-reinforced thermosetting
plastics (GRP) pipeline applications. It covers methods of test for the leaktightness and resistance to
damage of the joint only, when subject to specified combinations of longitudinal extension (draw),
angular movement (angular deflection), compression (deformation) perpendicular to the pipe axis
and internal pressure. This International Standard is applicable to joints for either pressure or non-
pressure applications.
NOTE The joints tested in accordance with this International Standard are subjected to conditions which
measure their ability to function and thereby prove the design of the joint, especially for type test purposes.
These test procedures are applicable to joints for pipes and fittings of all nominal sizes. The tests
are suitable for the evaluation of joints intended for applications in which the liquids are conveyed at
temperatures specified in the referring standards.
The test procedures in this International Standard are damaging to the test piece which will not be
suitable for reuse after these tests. The test procedure shall be applied for type testing purposes.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
pressure
hydrostatic gage pressure
2.2
angular deflection
angle between the axes of the joint and the consecutive pipe(s), expressed in degrees (°)
2.3
draw
longitudinal movement of the pipe relative to the socket (joint), expressed in millimetres (mm)
2.4
total draw
sum of the draw, and the additional longitudinal movement, of joint components due to the presence of
angular deflection, expressed in millimetres (mm)
2.5
deformation
pipe deformation in the coupling as a result of a vertical force on the pipe and a supported coupling
causing a step between the two pipe spigots at the loading position in millimeters (mm)
3 Principle
A test piece comprising two pieces of pipe jointed together, by incorporation of a socket or inclusion
of a double-socket coupler, is subjected to specified combinations of draw, angular deflection and
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ISO/FDIS 8639:2015(E)

deformation. In each specified combination the test piece is subjected to a series of test pressures for
specified periods of time, including an internal sub-atmospheric test pressure.
In addition, a test at elevated positive static pressure is conducted to prove the structural design of
the coupling.
When under pressure, the joint is monitored for leakage.
Between each test condition (see Table 1) the joint is inspected for signs of damage.
NOTE It is assumed that the following test parameters are set by the standard making reference to this
International Standard:
— the nominal size of the components to be connected by the joint (see 5.1);
— the pressure class of the components (see 5.1);
— the total effective length, L, of the test piece (see 5.1);
— the number of test pieces (see 5.2);
— if applicable, the conditioning to be applied (see Clause 6);
— the test temperature (see Clause 7);
— sequence of testing, if appropriate (see 8.1);
— the joint positions (see Table 1);
— the draw, angular deflection (see 8.3) and the force, F (see 8.4);
— the permissible change in negative pressure (see 8.2.3).
4 Apparatus
4.1 End-sealing devices
End sealing devices, of sizes and type appropriate to the components under test, anchored to take the
axial end thrust and permit free longitudinal movement.
4.2 Supports and restraints
4.2.1 Longitudinal supports, capable of supporting the end thrust induced by the internal pressure but
whic
...