ISO 7685:2019

Glass-reinforced thermosetting plastics (GRP) pipes — Determination of initial ring stiffness

This document specifies methods for determining the initial ring stiffness of glass-reinforced thermosetting plastics (GRP) pipes. Two methods are given (constant load and constant deflection), and within the specified deflection limits, each is equally valid and can be used for any diameter.

Tubes en plastiques thermodurcissables renforcés de verre (PRV) — Détermination de la rigidité annulaire initiale

General Information

• Status: Published
• Publication Date: 10-Jul-2019
• 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: 9060 - Close of review
• Start Date: 04-Mar-2029

Relations

• Revises: ISO 7685:1998 - Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Determination of initial specific ring stiffness
• Effective Date: 23-Apr-2016

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 7685
Second edition
2019-07
Glass-reinforced thermosetting
plastics (GRP) pipes — Determination
of initial ring stiffness
Tubes en plastiques thermodurcissables renforcés de verre (PRV) —
Détermination de la rigidité annulaire initiale
Reference number
ISO 7685:2019(E)
©
ISO 2019

---------------------- Page: 1 ----------------------
ISO 7685:2019(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
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: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 7685:2019(E)

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 . 3
5.3 Dimension-measuring instruments . 3
6 Test pieces . 4
6.1 Preparation . 4
6.2 Number . 4
6.3 Determination of dimensions . 4
6.3.1 General. 4
6.3.2 Length. 4
6.3.3 Wall thickness .
...