ISO INTERNATIONAL STANDARD 5149-2 Firstedition 2014-04-15 Refrigerating systems and heat pumps - Safety and environmental reguirements Part 2: Design, construction, testing, marking and documentation Systemesfrigorifiquesetpompes a chaleur-Exigences desécurite et d'environnement Partie 2:Conception,construction, essais, marquageet documentation Referencenumber IS05149-2:2014(E) LSO Copyright International Organization for Standardization @IS02014 license from IHS Not for Resale IS05149-2:2014(E) COPYRIGHTPROTECTEDDOCUMENT ISO2014 All rights reserved. Unless otherwise specified, 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 on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56.CH-1211 Geneva 20 Tel. + 4122 749 01 11 Fax +41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2014- All rights reserved No reproduction or networking permited without license from IHS Not for Resale IS0 5149-2:2014(E) Contents Page Foreword ..iv 1 Scope .1 2 Normativereferences .1 3 Terms and definitions 4 Requirementsforcomponents and piping .2 4.1 General requirements. .2 4.2 Specific requirements for particular components .4 4.3 Materials. 4 4.4 Testing .6 4.5 Markingand documentation .7 5 Requirementsforassemblies .8 5.1 General .8 5.2 Designandconstruction .9 5.3 Testing .28 5.4 Marking and documentation. 32 Annex A (informative) Checklist for external visual inspection of the refrigerating system .36 Annex B (normative)Additionalrequirements for refrigerating systems and heatpumps with ammonia (NH3) .37 AnnexC (informative) Determination ofcategoryforassemblies ..38 AnnexD(normative)Reguirementsforintrinsicsafetytest ..44 AnnexE (informative)Examplesfor arrangement ofpressurereliefdevices in refrigerating systems. .46 AnnexF (normative)Allowableequivalentlength of dischargepiping .51 AnnexG(informative)Stresscorrosioncracking .53 Bibliography .56 iii cense from IHS Not for Resale