ISO 4152:2021

INTERNATIONAL ISO
STANDARD 4152
First edition
Glass‐reinforced thermosetting plastics
(GRP) pipes — Determination of the
apparent axial long‐term modulus of
pipes subject to beam bending
Tubes en plastiques thermodurcissables renforcés de verre (PRV)
- Détermination du module axial apparent à long terme de tubes
soumis à la flexion de poutre
PROOF/ÉPREUVE
Reference number
ISO 4152:2021(E)
©
ISO 2021

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ISO 4152:2021(E)

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ISO 4152:2021(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Test piece . 3
7 Number of test pieces . 3
8 Determination of the dimensions of the test piece . 3
8.1 Outside diameter, d .
o 3
8.2 Mean wall thickness, e .3
8.3 Inner diameter, d .
i 4
8.4 Length . 4
9 Conditioning . 4
10 Procedure. 4
10.1 Preparation of test piece . 4
10.2 Preparation of supporting frame . 4
10.3 Mounting of test piece . 4
10.4 Mounting of displacement meters and zero readings . 5
10.5 Filling of test sample . 5
10.6 Monitoring deflection. 5
11 Calculating creep modulus . 5
12 Test report . 6
Bibliography . 7
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ISO 4152:2021(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
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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).
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URL: www .iso .org/ iso/ foreword .html.
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.
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ISO 4152:2021(E)

Introduction
The apparent axial long-term modulus of pipes subject to beam bending of pipes manufactured
according to ISO 23586 is required for designing pipe systems installed aboveground in accordance
with ISO/TS 10986.
The modulus is used to calculate deflections and rotations of pipes installed on two or more supports.
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INTERNATIONAL STANDARD ISO 4152:2021(E)
Glass‐reinforced thermosetting plastics (GRP) pipes —
Determination of the apparent axial long‐term modulus of
pipes subject to beam bending
1 Scope
This document specifies a method for determining the apparent axial long-term modulus of pipes
subject to beam bending deflection between vertically supported end-couplers, which allow rotation of
the pipe relative to the couplers.
In conjunction with ISO 10928, this document expresses the results of the test as an apparent axial
long-term modulus for use in the calculation of mid-span beam deflection and end rotation of GRP pipes
as specified in ISO/TS 10986.
Test conditions and requirements are specified in the referring standard.
For practical reasons, the test method is not suited for diameters greater than DN 600.
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 referenc
...