ISO 10466:1997

INTERNATIONAL ISO
STANDARD 10466
First edition
1997-11-15
Plastics piping systems — Glass-reinforced
thermosetting plastics (GRP) pipes — Test
method to prove the resistance to initial
ring deflection
Systèmes de canalisations en plastiques — Tubes en plastiques
thermodurcissables renforcés de verre (PRV) — Méthode d'essai pour
établir la résistance à la déflexion annulaire initiale
A
Reference number
ISO 10466:1997(E)

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ISO 10466:1997(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.
Draft International Standards adopted by the technical committees are circulated to the member bodies
for voting. Publication as an International Standard requires approval of at least 75% of the member
bodies casting a vote.
International Standard ISO 10466 was prepared by Technical Committee ISO/TC 138, Plastics pipes,
fittings and valves for the transport of fluids, Reinforced plastics pipes and fittings
Subcommittee SC 6,
for all applications,
in collaboration with CEN/TC 155, Plastics piping systems and ducting systems.
This International Standard is one of a series of standards on test methods for plastics piping systems
and ducting systems
©  ISO 1997
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
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Internet central@iso.ch
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Printed in Switzerland
ii

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©
INTERNATIONAL STANDARD  ISO ISO 10466:1997(E)
Plastics piping systems — Glass-reinforced thermosetting
plastics (GRP) pipes — Test method to prove the resistance
to initial ring deflection
1 Scope
This International Standard specifies a method for testing the ability of glass-reinforced thermosetting plastics
(GRP) pipes to withstand specified levels of initial ring deflection without displaying surface damage and/or
structural failure.
2 Definitions
For the purposes of this International Standard, the following definitions apply:
y
2.1 vertical deflection ( ): The vertical change in diameter of a pipe in a horizontal position in response to a
vertical compressive load (see 7.3).
It is expressed in metres.
2.2 relative vertical deflection (y/d ): The ratio of the vertical deflection y (see 2.1) to the mean diameter of the
m
d
pipe (see 2.3).
m
2.3 mean diameter (d ): The diameter of the circle corresponding with the middle of the pipe wall cross section.
m
It is given, in metres, by either of the following equations:
d = d + e
m i
d d e
= -
m e
where:
d is the average of the measured internal diameters (see 5.3.2),
i
  in metres;

d
 is the average of the measured external diameters (see 5.3.2),
e
  in metres;

e is the average of the measured wall thicknesses of the pipe

  (see 5.3.1), in metres.

2.4 visual evidence of structural failure: Unless otherwise specified by the referring standard, a failure apparent
in any of the following forms (see 7.3):
- interlaminar separation;
- tensile failure of the glass fibre reinforcement;
- buckling of the pipe wall;
- if applicable, separation of the thermoplastic liner from the structural wall.
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ISO
ISO 10466:1997(E)
2.5 strength-reduction evidence of structural failure: Unless otherwise specified by the referring standard, a
failure apparent in any of the following ways:
a) during the two-minute inspection period (see 7.3.5), there is an instantaneous drop in load in excess of 10 % of
the maximum load applied;
b) when an instantaneous drop in load of up to 10 % has occurred and the test piece cannot sustain an increase in
load equal to twice the reduction in load.
2.6  compressive load (F or F ): The load applied to a pipe to cause a diametric deflection.
1 2
It is expressed in newtons.
3 Principle
A length of pipe supported horizontally is loaded throughout its length to compress it diametrically to two successive
specified levels of vertical deflection (see figure 2). The pipe is inspected at the first deflection level for visual
evidence of surface damage and/or structural failure and at the second deflection level for visual evidence of
structural failure (see 2.4). A performance test for structural integrity is also carried out, as a function of the
resistance to loading.
NOTE: It is assumed that the following test parameters are set by the standard making reference to this standard:
a) the two pipe deflection limits (see 4.1 and 7.3);
b) the length of the test piece (see clause 5);
c) the number of test pieces (see clause 5);
d) the test temperature (see 7.1);
e) the surface(s) of the test piece to be inspected for surface damage (see 7.3);
f) the visual characteristics of surface damage and structural failure (see 7.3).
4 Apparatus
4.1 Compressive-loading machine, comprising a system capable of applying, without shock, a compressive force
at a controlled rate through two parallel load application surfaces conforming to 4.2 so that a horizontally orientated
pipe test piece conforming to clause 5 can be compressed vertically. The machine shall be able to achieve and
sustain in accordance with the periods specified in 7.3 the deflections or relative vertical deflections specified in the
referring standard.
4.2 Load application surfaces
4.2.1 General arrangement
The surfaces shall be provided by a pair of plates (see 4.2.2), or a pair of beam bars (see 4.2.3), or a combination
of one such plate and one such bar, with their major axes perpendicular to and centred on the direction of
application of the load F by the compressive-loading machine, as shown in figure 1. The surfaces in contact with the
test piece shall be flat, smooth, clean and parallel.
Plates and beam bars shall have a length at least equal to that of the test piece (see clause 5) and a thickness such
that visible deformation does not occur during the test.
4.2.2 Plates
The plate(s) shall have a width of at least 100 mm.
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ISO ISO 10466:1997(E)
Figure 1 – Schematic diagram of the test arrangement
4.2.3 Beam bars
E
...