ISO INTERNATIONAL STANDARD 17456 First edition 2006-09-15 Plastics piping systems Multilayer pipes Determination of long-term strength Systemes de canalisations en matieres plastiques-Tubes multicouches - Détermination de la resistance a long terme Reference number ISO 17456:2006(E) ISO2006 ISO 17456:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In ?ISO2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing 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 [email protected] Web www.iso.org Published in Switzerland @ ISO 2006-All rights reserved ISO 17456:2006(E) Contents Page Foreword Introduction 1 Scope 2 Normative references 3 Principle. 4 Terms and definitions 5 Testpieces 6 Determination of long-term strength 7 Test report. Annex A (normative) Validation of the pressure strength (Procedure I) Annex B (informative) Flow chart of long-term strength determination. Bibliography... Iso2006-All rightsreserved ii ISO 17456:2006(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 non-governmental,inliaisonwithIsO,alsotakepartinthework.IsOcollaboratescloselywiththe International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 17456 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fitings and valves for the theiraccessoriesTestmethodsandbasicspecifications iv ISo 2006-All rights reserved ISO 17456:2006(E) Introduction Subcommittee's Working Group WG 16 at Kyoto, Japan, in 1998, in response to worldwide demand for specifications, requirements and test methods for multilayer plastics pipes. The others are IsO 17454 [1] and ISO 17455 [2]. Only multilayer pipes are dealt with in this International Standard and for its purposes cross-linked polyethylene (PEX) as well as adhesives are to be considered as a thermoplastics material. The long-term pressure strength of a multilayer pipe can be measured experimentally using pressure test data Alternatively, the pressure strength of the pipe can be theoretically determined using an equation (see Annex A) that calculates the pressure resistance of each individual pipe layer from the layer dimensions and is then the sum of the calculated pressure strengths of the individual pipe layers. Consequently, two procedures for the determination of the long-term pressure strength of multilayer pipes are