ISO 10466:2021

Glass-reinforced thermosetting plastics (GRP) pipes - Test method to prove the resistance to initial ring deflection

This document 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.

Tubes en plastiques thermodurcissables renforcés de verre (PRV) — Méthode d'essai pour établir la résistance à la déflexion annulaire initiale

General Information

• Status: Published
• Publication Date: 11-Apr-2021
• ICS: 23.040.20 - Plastics pipes
• Technical Committee: ISO/TC 138/SC 6 - Reinforced plastics pipes and fittings for all applications
• Drafting Committee: ISO/TC 138/SC 6/WG 1 - Methods of test
• Current Stage: 6060 - International Standard published
• Start Date: 12-Apr-2021
• Due Date: 18-Oct-2021
• Completion Date: 12-Apr-2021

Relations

• Revises: ISO 10466:1997 - Plastics piping systems - Glass-reinforced thermosetting plastics (GRP) pipes - Test method to prove the resistance to initial ring deflection
• Effective Date: 23-Apr-2020

Overview

ISO 10466:2021 specifies a standardized test method for proving the resistance of glass‑reinforced thermosetting plastics (GRP) pipes to initial ring deflection. The method determines whether GRP pipe rings can withstand specified levels of diametral (ring) compression without surface damage or structural failure. This second edition updates and replaces ISO 10466:1997 and is intended for use where a referring standard sets the deflection limits, test-piece dimensions, test temperature and acceptance criteria.

Key Topics and Requirements

• Scope: Assessment of resistance to initial vertical (ring) deflection for GRP pipes - visual and strength‑reduction criteria for failure are defined.
• Test principle: A horizontal pipe ring is compressed diametrically to two successive specified deflection levels; inspections for surface damage and structural failure occur at each level.
• Apparatus: Requires a compressive‑loading machine and defined load‑application surfaces (plates or beam bars). Beam bars are required when relative deflection limits exceed 28%.
• Measurement & instruments:
  • Calibrated dimension‑measuring devices (length, diameter, wall thickness) with stated accuracy.
  • Instruments to measure the vertical change in diameter to specified tolerances.
  • Temperature measuring equipment where test temperature is specified.
• Test pieces & preparation: Complete pipe rings with specified length, smooth perpendicular ends and six reference lines at 60° intervals; wall thickness and mean diameter determined per ISO 3126 methods.
• Procedure:
  • Condition test pieces to test temperature.
  • Compress to the first deflection target over a controlled time, hold while visually inspecting for surface damage, then increase to the second target and monitor for structural failure and load drops.
  • Failure criteria include visual signs (interlaminar separation, fiber breakage, buckling, liner separation) and defined strength‑reduction behavior (instantaneous load drops).
• Reporting: Record deflection, applied loads, observations of damage or failure, test temperature and equipment used.

Applications

ISO 10466:2021 is practical for:

• GRP pipe manufacturers for product development, quality control and specification compliance.
• Independent test laboratories performing acceptance and type-testing.
• Pipeline designers, utilities and procurement teams specifying GRP pipe performance.
• Certification bodies and standards committees assessing structural integrity under compressive ring deflection.

Keywords: ISO 10466:2021, GRP pipes, glass‑reinforced thermosetting plastics, ring deflection test, compressive‑loading machine, pipe testing, structural failure criteria.

Related Standards

• ISO 3126 - referenced for methods to measure dimensions (wall thickness, diameters).
• Standards and specifications that reference ISO 10466 typically define the actual deflection limits, test temperature and number/length of test pieces.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 10466
Second edition
2021-04
Glass-reinforced thermosetting
plastics (GRP) pipes — Test method
to prove the resistance to initial ring
deflection
Tubes en plastiques thermodurcissables renforcés de verre (PRV) —
Méthode d'essai pour établir la résistance à la déflexion annulaire
initiale
Reference number
©
ISO 2021
© ISO 2021
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
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Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 3
5.1 Compressive-loading machine . 3
5.2 Load application surfaces . 3
5.2.1 General arrangement . 3
5.2.2 Plates . 3
5.2.3 Beam bars . 4
5.3 Dimension-measuring instruments . 4
5.4 Temperature-measuring instrument . 4
6 Test pieces . 4
6.1 Preparation . 4
6.2 Number . 4
6.3 Determination of dimensions . 4
6.3.1 Wall thickness . 4
6.3.2 Mean diameter . 5
7 Conditioning . 5
8 Procedure. 5
8.1 Test temperature . 5
8.2 Choice of load application surfaces and positioning of the test piece . 5
8.3 Application of load and measurement of deflection . 5
9 Test report . 6
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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committee has been established has the right to be represented on that committee. International
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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
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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.
This second edition cancels and replaces the first edition (ISO 10466:1997), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— Clause 2, "Normative references", has been added;
— subclause 5.3, "Dimension-measuring instruments, capable of determining", has been amended;
— subclause 6.3, "Determination of dimensions", has been amended.
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 2021 – All rights reserved

INTERNATIONAL STANDARD ISO 10466:2021(E)
Glass-reinforced thermosetting plastics (GRP) pipes — Test
method to prove the resistance to initial ring deflection
1 Scope
This document 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 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
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:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
vertical deflection
y
vertical change in diameter of a pipe in a horizontal position in response to a vertical compressive load
Note 1 to entry: It is expressed in metres.
3.2
relative vertical deflection
y/d
m
ratio of the vertical deflection, y, (3.1) to the mean diameter, d (3.3), of the pipe
m
3.3
mean diameter
d
m
diameter of the circle corresponding to the middle of the pipe wall cross-section and given, in metres
(m), by either of the following formulae:
dd=+e
mi
dd=−e
m e
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.
3.4
visual evidence of structural failure
unless otherwis
...