ISO 10468:2023
(Main)Glass-reinforced thermosetting plastics (GRP) pipes — Determination of the ring creep properties under wet or dry conditions
Glass-reinforced thermosetting plastics (GRP) pipes — Determination of the ring creep properties under wet or dry conditions
This document specifies methods for determining the ring creep properties for glass-reinforced thermosetting plastics (GRP) pipes. Properties include the creep factor and the long-term creep stiffness. Testing is performed under either wet (total immersion in water) or dry conditions. Dry creep testing is typically performed for the assessment and control of raw material consistency. Wet creep testing is typically undertaken to determine the long-term creep performance in simulated use conditions.
Tubes en plastiques thermodurcissables renforcés de verre (PRV) — Détermination des propriétés de fluage annulaires en conditions humides ou sèches
Le présent document spécifie les méthodes de détermination des propriétés de fluage annulaire pour les tubes en plastique thermodurcissable renforcé de verre (PRV). Les propriétés comprennent le facteur de fluage et la rigidité de fluage à long terme. Les essais sont réalisés dans des conditions humides (immersion totale dans l'eau) ou sèches. Les essais de fluage à sec sont généralement réalisés pour évaluer et contrôler la consistance des matières premières. Les essais de fluage en conditions humides sont généralement effectués pour déterminer la performance de fluage à long terme dans des conditions d'utilisation simulées.
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 10468
Third edition
2023-07
Glass-reinforced thermosetting
plastics (GRP) pipes — Determination
of the ring creep properties under wet
or dry conditions
Tubes en plastiques thermodurcissables renforcés de verre (PRV) —
Détermination des propriétés de fluage annulaires en conditions
humides ou sèches
Reference number
ISO 10468:2023(E)
© ISO 2023
---------------------- Page: 1 ----------------------
ISO 10468:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
© ISO 2023 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 10468:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 4
5 Apparatus . 4
5.1 Compressive loading machine . 4
5.2 Force application surfaces. 4
5.2.1 General arrangement. 4
5.2.2 Plates . 5
5.2.3 Beam bars . 5
5.3 Water container . 5
5.4 Measuring devices . 5
6 Test piece . 5
7 Number of test pieces .6
8 Determination of the dimensions of the test pieces . 6
9 Conditioning . 7
10 Procedure .7
11 Calculation . 7
11.1 Extrapolation of the deflection data . 7
11.2 Calculation of the long-term ring creep stiffness for position 1 . 8
11.3 Calculation of the creep factor . 8
12 Test report . 8
iii
© ISO 2023 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 10468:2023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
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,
in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/
TC 155, Plastics piping systems and ducting systems, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 10468:2018), which has been technically
revised.
The main changes are as follows:
— the Introduction has been deleted as the information is no longer relevant to this edition of the
document;
— in the test report, the “plot of measured deflection versus time” has been changed from an obligation
into an option of plotting deflection versus time or stiffness versus time;
— initial ring stiffness according to ISO 7685 can now be measured by constant load or constant
deflection.
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.
iv
© ISO 2023 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 10468:2023(E)
Glass-reinforced thermosetting plastics (GRP) pipes —
Determination of the ring creep properties under wet or
dry conditions
1 Scope
This document specifies methods for determining the ring creep properties for glass-reinforced
thermosetting plastics (GRP) pipes. Properties include the creep factor and the long-term creep
stiffness. Testing is performed under either wet (total immersion in water) or dry conditions.
Dry creep testing is typically performed for the assessment and control of raw material consistency.
Wet creep testing is typically undertaken to determine the long-term creep performance in simulated
use conditions.
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, Glass-reinforced thermosetting plastics (GRP) pipes — Determination of initial ring stiffness
ISO 10928:2016, 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 terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
vertical compressive force
F
vertical force, applied to a horizontal pipe to cause a vertical deflection (3.7)
Note 1 to entry: Vertical compressive force is expressed in Newtons.
3.2
ring stiffness
S
measure of the resistance of a pipe to ring deflection, per metre of length, under external load as defined
by Formula (1):
EI×
S = (1)
3
d
m
where
1
© ISO 2023 – All rights reserved
---------------------- Page: 5 ----------------------
ISO 10468:2023(E)
d is the mean diameter (3.3) of the pipe, in metres;
m
E is the apparent modulus of elasticity as determined in a ring stiffness test, in Newtons per square
metre;
I is the second moment of area in the longitudinal direction per metre length, in metres to the
4
fourth power per metre (m /m), as shown in Formula (2):
3
e
I= (2)
12
where e is the wall thickness of the pipe, in metres.
Note 1 to entry: Ring stiffness is expressed in Newtons per square metre.
3.3
mean diameter
d
m
diameter of the circle corresponding with the middle of the pipe wall cross-section and given by either
Formula (3) or Formula (4):
dd=+e (3)
mi
dd=−e (4)
me
where
d is the internal diameter, in metres;
i
d is the external diameter, in metres;
e
e is the wall thickness of the pipe, in metres.
Note 1 to entry: Mean diameter is expressed in metres.
3.4
initial ring stiffness
S
0
value of ring stiffness, S (3.2), determined by testing in accordance with ISO 7685
Note 1 to entry: Initial ring stiffness is expressed in Newtons per square metre.
3.5
long-term ring creep stiffness at position 1
S
x,1,creep
value of ring stiffness, S (3.2), at a reference position, position 1, at x years, obtained by extrapolation of
long-term stiffness measurements at a constant force ()
Note 1 to entry: See 10.2.
Note 2 to entry: Long-term ring creep stiffness at position 1 is expressed in Newtons per square metre.
3.6
creep factor
α
x,creep
ratio of the long-term ring creep stiffness to the initial ring stiffness (3.4), both at a reference position,
position 1 (see 10.2), and given by Formula (5):
S
x,,1 creep
α = (5)
x,creep
S
01,
2
© ISO 2023 – All rights reserved
---------------------- Page: 6 ---
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.