BS ISO BRITISH STANDARD 14531-4:2006 Plastics pipes and fittings Crosslinked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels Metric series - Specifications - Part 4: System design and installation guidelines ICS 23.040.20; 23.040.45; 75.200 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BS ISO 14531-4:2006 National foreword This British Standard reproduces verbatim IS0 14531-4:2006 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee PRI/88/2, Plastics piping for pressure applications, to Subcommittee PRI/88/2/6, Thermoplastics piping for gas supply, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BsI Catalogueunder the section entitled "International Standards Correspondence Index", or by using the"Search" facility of the BsI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does notofitself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 16, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. This British Standard was Amendments issued since publication published under the authority of the Standards Policy and Amd. No. Date Comments Strategy Committee on 30 June 2006 C BSI 2006 ISBN0580480259 BSISO14531-4:2006 INTERNATIONAL ISO STANDARD 14531-4 First edition 2006-04-01 Plastics pipes and fittings Crosslinked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels Metric seriesSpecifications- Part 4: System design and installation guidelines Tubes et raccordsenmatieresplastiquesSystemesdetubes en polyethylene reticule (PE-X)pour le transport de combustibles gazeux-Serie métrique-'Spécifications Partie4:Lignes directricespourla conceptionet I'installationdu systeme Reference number ISO 14531-4:2006(E) i BSIS014531-4:2006 Contents Page Foreword Introduction 1 Scope 2 Normativereference 3 Terms and definitions. 4 Reguirements 4.1 Design. 4.1.1 General.. 4.1.2 Materials 4.1.3 Pressure ranges... Minimum/maximum operating temperatures Tmin/Tmax*. 4.1.4 4.1.5 Pipes... 4.1.6 Pipelinecomponents 4.2 Construction.. 10 4.2.1 Handling,transportandstorage 10 4.2.2 Jointing 10 4.3 Laying ... 12 4.3.1 General. 12 4.3.2 Open-trench installation 12 4.3.3 Trenchless installation. 13 4.3.4 Stopping the gas flow.. 13 Tests on site... 5 5.1 General. 13 5.2 Pressuretest 13 Annex A (informative)Assessment of lifetime using Miner's rule... 15 Bibliography ... 16 ili BSISO14531-4:2006 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 InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. 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 re