ISO INTERNATIONAL STANDARD 21138-1 Second edition 2020-01 Plastics piping systems for non- pressure underground drainage and sewerage - Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) - Part 1: Material specification and performance criteria for pipes, fittings and systems Systemes de canalisations enplastiquepour les branchementset les collecteurs d'assainissement sans pression enterrés - Systemes de canalisations a parois structurees en poly(chlorure de vinyle) non plastifié(PVC-U),polypropylene (PP)etpolyéthylene(PE) Partie 1: Specification des matieres et criteres de performance des tubes, raccordsetsysteme Referencenumber IS0 21138-1:2020(E) iso @ ISO 2020 IS021138-1:2020(E) COPYRIGHTPROTECTEDDOCUMENT @IS02020 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 below orIso's member body in the country of therequester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland i @IS0 2020 - All rights reserved IS021138-1:2020(E) Contents Page Foreword iv Introduction. Scope. 1 1 2 Normativereferences .1 3 Terms, definitions, symbols and abbreviated terms .3 Terms and definitions 3.1 3.2 Symbols. 5 3.3 Abbreviatedterms 4 Material 6 4.1 General 6 4.2 Sealingring retaining components 6 4.3 Sealing rings 6 4.4 Fused or welded joints 6 5 Designation of wall construction. 6 6 Colour .7 7 Geometrical characteristics .7 8 Types of fitting .7 8.1 General 7 8.2 Design length of fittings 9 .10 9 Functional characteristics 10 Relationbetween ring stiffness, installationtechnique and resulting deflection .10 Annex A (informative) General material characteristics of PvC-U, PPand PE pipes and fittings. AnnexB(informative)GeneralperformancecharacteristicsofPvC-U,PPandPE .13 AnnexC (informative) Structural design. .14 Bibliography 17 IS0 2020-All rights reserved iii