ISO 24690:2025
(Main)Glass reinforced thermosetting plastic (GRP) pipes — Test method for the determination of long-term pressure endurance strength
Glass reinforced thermosetting plastic (GRP) pipes — Test method for the determination of long-term pressure endurance strength
This document specifies a method for determining the long-term pressure endurance of glass-reinforced thermosetting plastics (GRP) pipes, based on the residual failure strength of test pieces after ageing for a specified time at specified internal pressure and temperature. The internal environment is specified in the referring standard. The external environment can be air or water.
Tubes en plastiques thermodurcissables renforcés de verre (PRV) — Méthode d'essai pour la détermination de la résistance d'endurance à la pression à long terme
General Information
Standards Content (Sample)
International
Standard
ISO 24690
First edition
Glass reinforced thermosetting
2025-10
plastic (GRP) pipes — Test method
for the determination of long-term
pressure endurance strength
Tubes en plastiques thermodurcissables renforcés de verre
(PRV) — Méthode d'essai pour la détermination de la résistance
d'endurance à la pression à long terme
Reference number
© ISO 2025
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ii
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 Measuring devices .2
5.2 End sealing devices.2
5.3 Supports .3
5.4 Container .3
5.5 Pressurising system .4
5.6 Pressure measuring device .4
5.7 Electric resistance meter .4
5.8 Strain measuring device(s) .4
6 Test pieces . 4
6.1 Number .4
6.2 Free length .4
6.3 Cutting . .4
7 Conditioning . 4
8 Procedure . 4
8.1 Temperature .4
8.2 Dimension measurements . .4
8.3 Strain measurements .4
8.4 Sealing .5
8.5 Aging pressure . .5
8.6 Failure pressure .5
9 Detection of failure . 5
9.1 General .5
9.2 Detection methods .6
9.2.1 Loss of test liquid .6
9.2.2 Drop in electrical resistance . .6
10 Test report . 6
Bibliography . 7
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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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.
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
Introduction
This test method is an alternative to other methods to determine long-term pressure performance of glass
reinforced plastic pipes. The method removes the unpredictability of time to failure of specimens subject to
constant pressure.
The main difference is that all specimens are aged at a constant internal pressure and temperature, and
at a series of specified times individual specimens are loaded to short-term failure as a measure of their
residual strength. When all the specimens have been tested, the residual strength is extrapolated over time
to determine long-term performance.
This test method can be used to obtain data to establish internal pressure versus time-to-failure
relationships. The procedures for establishing the relationships are not within the scope of this document.
For such purposes, attention is drawn to ISO 10928.
v
International Standard ISO 24690:2025(en)
Glass reinforced thermosetting plastic (GRP) pipes —
Test method for the determination of long-term pressure
endurance strength
1 Scope
This document specifies a method for determining the long-term pressure endurance of glass-reinforced
thermosetting plastics (GRP) pipes, based on the residual failure strength of test pieces after ageing for a
specified time at specified internal pressure and temperature. The internal environment is specified in the
referring standard. The external environment can be air or water.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 10928, Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes and fittings —
Methods for regression analysis and their use
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
failure
occurrence of bursting, leaking, or weeping
[SOURCE: ISO 7509:2015, 3.1]
3.2
bursting
failure by rupture of the pipe wall with immediate loss of test liquid and drop of pressure
[SOURCE: ISO 7509:2015, 3.2]
3.3
leaking
failure by visible loss of the pressurizing liquid through the pipe wall to an extent detectable visually and/or
by a continuous drop in pressure
[SOURCE: ISO 7509:2015, 3.3]
3.4
weeping
failure by passage of the pressurizing liquid through the pipe wall to an extent detectable visually and/or
electronically
[SOURCE: ISO 7509:2015, 3.4]
3.5
endurance strength
ability to maintain functional performance over time
3.6
residual strength
value of short-term failure pressure after ageing test
4 Principle
Cut lengths of pipe are subjected to a specified internal hydrostatic pressure to cause a state of stress in the
pipe wall which repr
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