ISO INTERNATIONAL STANDARD 7509 Second edition 2015-03-01 Plastics piping systems - Glass- reinforced thermosetting plastics (GRP) pipes - Determination of time to failure under sustained internal pressure Systemes de canalisations enplastiques-Tubes enplastiques thermodurcissables renforcés de verre (PRV)-Détermination du temps mis jusqu'a la défaillance sous une pression interne constante Reference number IS0 7509:2015(E) SO International Organization for Standardization @ IS0 2015 ng Institute of Standardization 5956617 vided by IHS under ted without license from IHS IS0 7509:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS02015 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax +41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland PrganizationforStandardization Iby IHS unde Not for Resale, 2015/6/2 07:05:00 networking permited without license from IHS IS0 7509:2015(E) Contents Page Foreword ..iv Introduction. ... 1 Scope.. 2 Normativereferences 3 Terms and definitions 4 Principle 5 Apparatus. ..2 6 Test pieces. ..4 6.1 Number ..4 6.2 Freelength ..4 6.3 Cutting ..4 7 Conditioning ..4 8 Procedure ..4 9 Detectionoffailure ..5 9.1 General. .5 9.2 Detection methods. .5 9.2.1 Loss of test liquid. .5 9.2.2 Drop in electrical resistance .6 10 Test report .6 Annex A (informative) Electronic leak/weep detection 7 iii see=Zhejiang Institute of Standardization 5956617 vided by IHS under ed without license from IHS