ISO INTERNATIONAL STANDARD 13761 Secondedition 2017-07 Plastics pipes and fittings - Pressure reduction factors for polyethylene pipeline systems for use at temperatures above 20 °C Tubes et raccords en matieres plastiques Facteurs de réduction de pression des canalisations en polyéthylene utilisées a des températures supérieures a 20 ℃ Reference number IS0 13761:2017(E) International Organization for Standardization @ IS0 2017 e=ZHEJIANG INST OF STANDARDIZATION C1 5956617 mitted without license from IHS IS0 13761:2017(E) COPYRIGHT PROTECTED DOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Licensee-ZHEJIANG INST.OF STANDARDIZzRoISQ7 - All rights reserved No reproduction or networking permited without license from IHS IS0 13761:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope.. 2 Normative references 3 Terms and definitions 4 Principle 5 Procedure ..1 5.1 Determination of the applicable pressure reduction factor 1 5.2 Analysis of data by extrapolation ..2 5.3 Design lifetime. ..2 Bibliography 4 Inteainal oganzation @st(Sr207 - All rights reserved icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ii vided by IHS under I Not for Resale, 2017/9/27 05:22:21 ed without license from IHS