ISO 10471:2018
(Main)Glass-reinforced thermosetting plastics (GRP) pipes — Determination of the long-term ultimate bending strain and the long-term ultimate relative ring deflection under wet conditions
Glass-reinforced thermosetting plastics (GRP) pipes — Determination of the long-term ultimate bending strain and the long-term ultimate relative ring deflection under wet conditions
This document specifies a method for determining by extrapolation the long-term ultimate ring bending strain and the calculation of the long-term ultimate relative ring deflection of glass-reinforced thermosetting plastics (GRP) pipes, under wet conditions. Two methods of loading are given, one using plates the other beam bars.
Tubes en plastiques thermodurcissables renforcés de verre (PRV) — Détermination de l'effort à la flexion ultime à long terme et réflexion annulaire relative ultime à long terme dans des conditions mouillées
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INTERNATIONAL ISO
STANDARD 10471
Second edition
2018-05
Glass-reinforced thermosetting
plastics (GRP) pipes — Determination
of the long-term ultimate bending
strain and the long-term ultimate
relative ring deflection under wet
conditions
Tubes en plastiques thermodurcissables renforcés de verre (PRV) —
Détermination de l'effort à la flexion ultime à long terme et réflexion
annulaire relative ultime à long terme dans des conditions mouillées
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Apparatus . 5
5.1 Compressive loading machine . 5
5.2 Force application surfaces . 5
5.2.1 General arrangement . 5
5.2.2 Plates . 5
5.2.3 Beam bars . 5
5.3 Water container. 5
5.4 Measuring devices. 6
6 Test piece . 7
7 Number of test pieces . 7
8 Determination of the dimensions of the test piece . 7
8.1 Length . 7
8.2 Wall thickness . 7
8.3 Mean diameter . 7
9 Conditioning . 7
10 Procedure. 7
11 Calculation . 8
11.1 Extrapolation of the strain data to obtain the x-year value, ε . . 8
x, wet
11.2 Calculation of the long-term ultimate relative ring deflection under wet conditions,
y /d . 9
u, wet, x m
12 Test report . 9
Annex A (informative) Equal increments of lg (time in h) .10
Foreword
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bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
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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.
This second edition cancels and replaces the first edition (ISO 10471:2003), which has been technically
revised. It also incorporates the Amendment ISO 10471:2003/Amd1: 2010.
The major changes to this edition include:
— reference to ISO 3126 for dimension measurement;
— clarification of accuracy statements;
— inclusion of calculation procedure for spring-line failures.
iv © ISO 2018 – All rights reserved
INTERNATIONAL STANDARD ISO 10471:2018(E)
Glass-reinforced thermosetting plastics (GRP) pipes —
Determination of the long-term ultimate bending strain
and the long-term ultimate relative ring deflection under
wet conditions
1 Scope
This document specifies a method for determining by extrapolation the long-term ultimate ring
bending strain and the calculation of the long-term ultimate relative ring deflection of glass-reinforced
thermosetting plastics (GRP) pipes, under wet conditions.
Two methods of loading are given, one using plates the other beam bars.
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 7685, Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Determination
of initial specific ring stiffness
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 terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at https: //www .iso .org/obp
3.1
vertical compressive force
F
vertical force, applied to a horizontal pipe to cause a vertical deflection
Note 1 to entry: Vertical compressive force is expressed in newtons.
3.2
mean diameter
d
m
diameter of the circle corresponding with the middle of the pipe wall cross-section and given by either
of the following formulae:
dd=+e
mi
dd=−e
me
where
d is the internal diameter, in metres (m);
i
d is the external diameter, in metres (m);
e
e is the wall thickness of the pipe, in metres (m).
Note 1 to entry: Mean diameter is expressed in metres.
3.3
vertical deflection
y
vertical change in diameter of a pipe in a horizontal position in response to a vertical compressive
force (3.1)
Note 1 to entry: Vertical deflection is expressed in metres.
3.4
relative vertical deflection
y/d
m
ratio of the vertical deflection, y (3.3), to the mean diameter (3.2) of the pipe, d
m
3.5
ultimate vertical deflection under wet conditions
y
u, wet
vertical deflection (3.3) of the pipe, y, when failure occurs under wet conditions (see Clause 4)
Note 1 to entry: Ultimate vertical deflection under wet conditions is expressed in metres.
3.6
ultimate relative vertical deflection under wet conditions
y /d
u, wet m
ratio of the ultimate vertical deflection under wet conditions, y (3.5), to the mean diameter (3.2) of
u, wet
the pipe, d
m
3.7
long-term ultimate ring deflection under wet conditions
y
u, wet, x
extrapolated value of the ultimate vertical deflection under wet conditions (3.5) of the pipe, y , when
u, wet
failure is expected to occur at a time, x, specified in the referring standard
Note 1 to entry: Long-term ultimate ring deflection under wet conditions is expressed in metres.
3.8
long-term ultimate relative ring deflection under wet conditions
y /d
u, wet, x m
ratio of the long-term ultimate ring deflection under wet conditions (3.7) of the pipe, y , to the mean
u, wet, x
diameter (3.2) of the pipe, d
m
3.9
failure
loss of the structural integrity of a test piece as evidenced by the inability of the test piece to carry the load
2 © ISO 2018 – All rights reserved
3.10
time to failure
t
u
time elapsed until failure (3.9) occurs
Note 1 to entry: Time to failure is expressed in hours.
3.11
specific ring stiffness
S
physical characteristic of a pipe, that is a measure of the resistance to ring deflection per metre length
under external load and is defined by the following formulae
EI×
S =
d
m
where
E is the apparent modulus of elasticity, in newtons per square metre, determined by testing in
accordance with ISO 7685;
I is the second moment of area in the longitudinal direction per metre length, in metres to the
fourth power per metre (m /m), i.e.
e
I=
where
e is the wall thickness of the pipe, in metres (m);
d is the mean diameter of the pipe, in metres (m) (see 3.2).
m
Note 1 to entry: Specific ring stiffness is expressed in newtons per square metre.
3.12
initial specific ring stiffness
S
value of specific ring stiffness S (3.11), determined by testing in accordance with ISO 7685
Note 1 to entry: Initial specific ring stiffness is expressed in newtons per square metre.
3.13
strain factor
D
g
dimensionless factor used to transform a deflection value into a strain value
4 Principle
Each of several cut lengths of pipe is supported horizontally and loaded throughout its length to
compress it diametrically to achieve a desired level of strain. The force application surfaces are either
bearing plates or beam bars.
The pipe is immersed in water at a given temperature for a period of time during which the force remains
constant and the increasing vertical deflection is measured at intervals until failure (see
...
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