ISO INTERNATIONAL STANDARD 6993-4 First edition 2006-06-01 Buried, high-impact poly(vinyl chloride) (PvC-Hl) piping systems for the supply of gaseous fuels Part 4: Code of practice for design, handling and installation Systemes decanalisations enterrees enpoly(chlorurede vinyle)a resistanceau chocaméliorée (PvC-Hl)pourréseaux decombustibles xneze Partie 4:Code de pratique pourla conception, la manutention et Iinstallation Reference number ISO 6993-4:2006(E) @ISO 2006 ISO 6993-4:2006(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 downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat 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 the unlikely event that a problem relating to it is found, please infom the Central Secretariat at the address given below. ISO2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's member body in the country of the requester. ISO copyright office Case postale 56·CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2006 - All rights reserved ISO 6993-4:2006(E) Contents Page Foreword. iv Introduction 1 Scope 2 Normativereferences 3 Terms and definitions.... 2 4 Design.. 5 Installation.. 6 Storage, handling and transportation.. 7 Quality control.... Bibliography..... @ IS0 2006 All rights reserved ii ISO 6993-4:2006(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been non-governmental, in liaison with IsO, also take part in the work. IsO collaborates closely with the 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 6993-4 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 4,Plastics pipes and fittings forthe supply ofgaseous fuels. This first edition of ISO 6993-4, together with ISO 6993-1, ISO 6993-2 and ISO 6993-3, cancels and replaces IsO 6993:2001, of which it constitutes a technical revision. Iso 6993 consists of the following parts, under the general title Buried, high-impact poly(vinyl chloride) Part1:Pipesforamaximumoperatingpressureof1bar (100kPa) Part2:Fittingsforamaximumoperatingpressureof200mbar(20kPa) Part3:Fittingsandsaddlesforamaximumoperatingpressureof1bar(100kPa) Part4:Codeofpracticefordesign,handlingand installation iv @ISO 2006-All rights reserved ISO 6993-4:2006(E) Introduction This part of IsO 6993 addresses the common basic principles for gas supply systems. Its users need to be aware that more detailed national standards and/or codes of practice might exist in the IsO member countries with those national standards and/or codes of practice related to the above-mentioned basic principles. @Iso2006-Allrights reserved V INTERNATIONALSTANDARD ISO 6993-4:2006(E) Buri