BS ISO 18225:2012 BSI Standards Publication Plastics piping systems - Multilayer piping systems for outdoor gas installations - Specifications for systems bsi. ..making excellenCe a habit. BS ISO 18225:2012 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 18225:2012. It supersedesBS ISO 18225:20g7 which is withdrawn. The UK participation in its preparation was entrusted to Technica Committee PRI/88/2, Plastics piping for pressure applications. A list of organizations represented onthis committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012.Published by BSI Standards Limited 2012 ISBN9780580776144 ICS 23.040.20; 23.040.45; 75.200 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the StandardsPolicyandStrategyCommitteeon31December2012 Amendments issued since publication Date Textaffected BS ISO 18225:2012 ISO 18225 INTERNATIONAL STANDARD Second edition 2012-12-01 Plastics piping systems - Multilayer piping systems for outdoor gas installations Specifications for systems Systemesdecanalisations enplastique-Tubesmulticouchesdestines a I'alimentation en gaz a I'exterieur des batiments-Specifications pour les systemes EIE TSO ISORec2o bey @ISO2012 BS ISO 18225:2012 IS018225:2012(E) COPYRIGHTPROTECTEDDOCUMENT ISO2012 Aleaightedresawiecbitmlesbathahwiseispbcifiagphotocqpyingfahispekiositianwithbutpepmosbiondrottlizg idfromaoynitheatshbyany address below or Iso's member body in the country of the requester. ISS postalet : ficeCH-1211Geneva20 Tel+4227490111 Fax + 41 22 749 09 47 oMMei Published in Switzerland ii @ IS0 2012 - All rights reserved BS ISO18225:2012 IS0 18225:2012(E) Contents Page Foreword iv Iptroduction. V Scope 1 2 Normative references 1 3 Terms and definitions 2 3.1 Structural definitions 2 3.2 Geometrical definitions 3 3.3 Dlefieritabsnsdefiatitibns pressure. 3.5 Definitions relatedtomaterial characteristics. 4 .5 4 3.6 Terms related to service conditions Pipes 5 4.1 Material 5 4.2 General characteristics. 6 4.3 Meclearsicadspfroperties 6 4.5 Physical properties 10 5 Fittings .11 5.1 Fittings reference standards 11 5.2 Materials 11 6 Fitnessforpurposeofthesystem .11 7 Marking and documentation .12 7.1 Legibility .12 7.2 Damage. 12 7.3 Minimum marking requirements .12 Annex A (normative) List of reference product standards .14 Annex B (normative) Testing resistance togas constituents .15 Annex C (normative) Testing resistance to weathering of outer layer of M-pipes .16 Bibliography .17 IS0 2012- All rights reserved iii BS ISO18225:2012 IS0 18225:2012(E) Foreword thodiegh(IsO tecamloet boabieasiftahsewofkdf peapbringbodyIrititetretitedaihStandebjdstisoowhidlycarrtiechaital committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with Iso, also take part in the work. ISO collaborates closely withthe electrotechnical standardization. International Electrotechnical Commission (IEC) on all matters of International Standards aredrafted in accordance with therules given in the ISO/IEC Directives, Part 2. stanmariastaak pfedbechnical terhniateescommitteesprepare Intiisidttetal StartherasepbareBrafernatfoh xpting Publication as an International Standard requires approval by at least 75 % of the member bodies castingavote Atentiommights.tfawrtshthe hetpsksibilthatespaisiblth6relaerntifg angltisiscldeatleht mhayrights.the subject of IS018225wasprepared byTechnical CommitteeIS0/TC138,Plastics pipes,fittings and valves for the transportoffluids,SubcommitteeSC 4,Plasticspipes andfittingsforthesupplyofgasgousfuels This second edition cancels and replaces the first edition (IS0 18225:2007) which has been technicallyrevised. iv IS