ISO INTERNATIONAL STANDARD 13268 Second edition 2022-06 Thermoplastics piping systems for non-pressure underground drainage and sewerage Thermoplastics shafts or risers for inspection chambers and manholes Determination of ring stiffness Systemes de canalisations thermoplastiques pour branchements etcollecteursd'assainissemententerressanspression-Elements de rehausse thermoplastiques pourchambres d'inspection et de branchement ou regards - Determination de la rigidite annulaire Referencenumber IS0 13268:2022(E) ISO @ISO2022 IS0 13268:2022(E) COPYRIGHTPROTECTEDDOCUMENT ISO2022 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 anyform or by anymeans, electronic or mechanical, including photocopying, orposting on theinternetoran intranet,withoutpriorwrittenpermission.Permissioncanberequestedfrom eitherIsoattheaddressbelow or ISO's member body in the country of the requester. ISO copyright office CP401 : Ch.de Blandonnet 8 CH-1214 Vernier,Geneva Phone: +4122 749 0111 Email: [email protected] Website:www.iso.org Published in Switzerland ii @IS0 2022-All rights reserved