ISO 10952:2014
(Main)Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes and fittings — Determination of the resistance to chemical attack for the inside of a section in a deflected condition
Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes and fittings — Determination of the resistance to chemical attack for the inside of a section in a deflected condition
ISO 10952:2014 specifies a method for determining the chemical resistance properties of glass-reinforced thermosetting plastics (GRP) pipes and fittings in a deflected condition for nominal sizes DN 100 and larger. In conjunction with ISO 10928, ISO 10952:2014 provides a method for evaluating the effect of a chemical environment on the interior of a pipe or fitting after a specified period of time. Test conditions and requirements are specified in the referring International Standard. ISO 10467 references ISO 10952:2014.
Systèmes de canalisations en matières plastiques — Tubes et raccords en plastiques thermodurcissables renforcés de verre (PRV) — Détermination de la résistance à une attaque chimique à l'intérieur d'un tronçon de tube soumis à déflexion
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INTERNATIONAL ISO
STANDARD 10952
Third edition
2014-03-15
Plastics piping systems — Glass-
reinforced thermosetting plastics
(GRP) pipes and fittings —
Determination of the resistance to
chemical attack for the inside of a
section in a deflected condition
Systèmes de canalisations en matières plastiques — Tubes et raccords
en plastiques thermodurcissables renforcés de verre (PRV) —
Détermination de la résistance à une attaque chimique à l’intérieur
d’un tronçon de tube soumis à déflexion
Reference number
ISO 10952:2014(E)
©
ISO 2014
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ISO 10952:2014(E)
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ii © ISO 2014 – All rights reserved
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ISO 10952:2014(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Test liquid . 2
6 Apparatus . 2
7 Test pieces . 3
7.1 Preparation . 3
7.2 Number . 4
8 Determination of the dimensions of the test piece . 4
8.1 Length . 4
8.2 Mean wall thickness . 4
8.3 Mean diameter . 4
9 Conditioning . 4
10 Test procedure using deflection measurement . 4
11 Test procedure using strain measurement . 6
12 Calculation of extrapolated value . 7
13 Test report . 7
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ISO 10952:2014(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.
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 (see 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 (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
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 third edition cancels and replaces the second edition (ISO 10952:2008), of which it constitutes a
minor revision.
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INTERNATIONAL STANDARD ISO 10952:2014(E)
Plastics piping systems — Glass-reinforced thermosetting
plastics (GRP) pipes and fittings — Determination of the
resistance to chemical attack for the inside of a section in a
deflected condition
1 Scope
This International Standard specifies a method for determining the chemical resistance properties of
glass-reinforced thermosetting plastics (GRP) pipes and fittings in a deflected condition for nominal
sizes DN 100 and larger.
In conjunction with ISO 10928, this International Standard provides a method for evaluating the effect
of a chemical environment on the interior of a pipe or fitting after a specified period of time. Test
conditions and requirements are specified in the referring International Standard. ISO 10467 references
this International Standard.
NOTE It has been found that the effect of chemical environments can be accelerated by strain induced from
deflection; hence, it is frequently referred to as strain corrosion.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 10467, Plastics piping systems for pressure and non-pressure drainage and sewerage — Glass-reinforced
thermosetting plastics (GRP) systems based on unsaturated polyester (UP) resin
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.
3.1
mean diameter
d
m
diameter of the circle corresponding with the middle of the pipe wall cross section
Note 1 to entry: The mean diameter is given by either of the following formulae:
d = d + e
m i m
d = d − e
m e m
where
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ISO 10952:2014(E)
d is the external diameter of the pipe;
e
d is the internal diameter of the pipe;
i
e is the mean wall thickness of the pipe at the bottom.
m
Note 2 to entry: The mean diameter and the dimensions used to calculate it are expressed in millimetres.
3.2
leak failure
failure which becomes apparent by the passage of the test liquid through the pipe wall
Note 1 to entry: Failures of the test sample have been observed at the spring-line location without leakage of the
test liquid. While leakage is not observed, this can be considered a failure of the test sample as the strain levels
in the sample will be altered invalidating any continuation of the test. The test can be discarded or optionally
counted as a failure occurring at the time of spring-line breakage.
4 Principle
The interior of a test piece is exposed to a corrosive test liquid at a specified temperature while being
maintained in a fixed diametrically deflected condition. The test is repeated at several deflection levels,
using a fresh test piece each time and recording the time to leak failure at each deflection. The results
are used to calculate an extrapolated deflection value for a specified period of time.
Alternatively, the extrapolation can be performed using calculated or measured strains. Strain can be
measured using strain gauges.
NOTE Use of strain allows testing using test pieces of variable thickness and stiffness classes. Deflection and
strain are interrelatable by calculation.
It is assumed that the following test parameters are set by the International Standard making reference
to this International Standard:
a) the composition of the test liquid (see Clause 5);
b) the number and length of test pieces (see Clause 7);
c) the preconditioning to be applied (see Clause 9);
d) the test temperature (see 10.1 or 11.1);
e) if failures do not occur (see 10.11 and 11.11), the specified deflection levels and related minimum
time intervals;
f) the time to which the data have to be extrapolated (see Clause 12).
5 Test liquid
The test liquid shall be as specified in the referring International Standard. The quantity shall be
sufficient to achieve and maintain for the duration of the test the specified depth within the test piece
(see 10.7 or 11.7).
6 Apparatus
6.1 Loading frame, comprising two parallel steel sections and threaded rods which can maintain a
constant deflection of the test piece (see Figure 1 for typical test set-up). The sections shall be sufficiently
stiff such that visible bending or deformation of the sections does not occur during the compression of
the test piece. Each section shall have a length equal to the length of the test piece plus at least 30 mm
and a width of at least 100 mm.
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ISO 10952:2014(E)
6.2 Dimensional measuring devices, capable of determining:
a) the dimensions (length, diameter, and wall thickness) to an accuracy of within ±0,5 %;
b) the change in diameter of the test piece in the vertical direction to an accuracy of within ±1,0 % of
the maximum value of the change;
c) if used, strain gauges of the foil type, single element suitable for the maximum anticipated strain
level, and a length appropriate for the pipe diameter.
Strain gauges of length 6 mm and 12 mm have been found to be effective for pipe diameters 300 mm
to 600 mm. Consult the strain gauge manufacturer for gauge length recommendations for other pipe
diameters.
Key
1 steel channel section
2 dam
3 sealant
4 threaded rod
5 test liquid
6 test piece
7 strain gauge (optional)
D deflected diameter
dm
Figure 1 — Typical test set-up
7 Test pieces
7.1 Preparation
The test piece shall comprise a complete ring cut from the pipe or fitting to be tested. The length of
the test piece shall be as specified in the referring International Standard, with permitted deviations
of ±5 %.
The cut ends shall be smooth and perpendicular to the axis of the test piece.
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ISO 10952:2014(E)
Two straight lines, diametrically opposed, shall be drawn longitudina
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