ISO/PRF 10952

DRAFT INTERNATIONAL STANDARD
ISO/DIS 10952
ISO/TC 138/SC 6 Secretariat: ASI
Voting begins on: Voting terminates on:
2020-09-17  2020-12-10
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
ICS: 23.040.45; 23.040.20
THIS DOCUMENT IS A DRAFT CIRCULATED
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THEREFORE SUBJECT TO CHANGE AND MAY
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This document is circulated as received from the committee secretariat.
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Reference number
NATIONAL REGULATIONS.
ISO/DIS 10952:2020(E)
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PROVIDE SUPPORTING DOCUMENTATION. ISO 2020
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ISO/DIS 10952:2020(E)
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© ISO 2020

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Foreword ........................................................................................................................................................................................................................................iv

1  Scope .................................................................................................................................................................................................................................1

2  Normative references ......................................................................................................................................................................................1

3  Terms and definitions .....................................................................................................................................................................................1

4 Principle ........................................................................................................................................................................................................................2

5  Test liquid ....................................................................................................................................................................................................................2

6  Apparatus .....................................................................................................................................................................................................................2

6.1 Loading frame .......................................................................................................................................................................................... 2

6.2 Dimensional measuring devices .............................................................................................................................................. 3

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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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 forth edition cancels and replaces the third edition (ISO 10952:2014), which has been technically

— The measurement of the mean wall thickness in 8.2 and the mean diameter in 8.3 were precised.

This document 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

In conjunction with ISO 10928, this document 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 23856 references this document.

NOTE It has been found that the effect of chemical environments can be accelerated by strain induced from

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 23856, Plastics piping systems for pressure and non-pressure water supply, drainage or 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 —

diameter of the circle corresponding with the middle of the pipe wall cross section

Note 2 to entry: The mean diameter and the dimensions used to calculate it are expressed in millimetres.

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

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

NOTE Use of strain allows testing using test pieces of variable thickness and stiffness classes. Deflection and

It is assumed that the following test parameters are set by the International Standard making reference

e) if failures do not occur (see 10.11 and 11.11), the specified deflection levels and related minimum

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

The frame comprises of 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) the dimensions (length, diameter, and wall thickness) of the test pieces. The devices shall be

b) the change in diameter of the test piece in the vertical direction. The device shall be calibrated to

c) if used, strain gauges of the foil type, single element suitable for the maximum anticipated strain

Strain gauges of length 6 mm and 12 mm have been found to be effective for pipe diameters 300 mm