ISO INTERNATIONAL STANDARD 16923 First edition 2016-12-15 Natural gas fuelling stations CNG stations for fuelling vehicles Stations-service degaz naturel-StationsGNC pour le ravitaillement devéhicules Reference number ISO 16923:2016(E) ISO Intemational Organization for Standardization @IS02016 itted without licensefrom IHS IS0 16923:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS02016,Published inSwitzerland 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 Ch. de Blandonnet 8. CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +4122 749 09 47 copyright@iso.org www.iso.org Intemationaibr PrganizationforStandardization networking permited without license from IHS IS016923:2016(E) Contents Page Foreword ..V 1 Scope. ..1 2 Normativereferences 3 Terms and definitions 4 Symbols and abbreviated terms :8 Symbols. .8 4.2 Abbreviated terms .8 5 Risk management .8 6 General design requirements ..9 6.1 General .9 6.2 Sitelayout .10 6.3 Pressure safety relief valves and venting ..10 7 Fuel supplytothefuelling station .11 7.1 Supply by pipeline.. ..11 7.2 Supply by mobile storage ..11 8 Dryer ..12 9 Compressors .12 9.1 General ..12 9.2 Instrumentationandcontrol ..13 9.3 Crankcase design. .13 9.4 Compressor enclosures, buildings and canopies .14 9.5 Underground compressor installations. .16 9.6 Hazardous area classification. ..16 10 Buffer storage .16 11 Dispensers. .17 11.1 General requirements ..17 11.2 Breakawaydevices .17 11.3 Fuellinghose assemblies .18 11.4 Fuellinghoses .19 11.5 Enclosure. .19 11.6 Fuelling controls and instrumentation 20 11.7 Electricalsystemsandinterconnections 22 11.8 Documentation .22 12 Gas odorization .22 13 Pipework. .23 13.1 General .23 13.2 Buried piping .23 14 Electrical 24 14.1 Labelling .24 14.2 Contact with liveparts 24 14.3 Cables 24 14.4 Performance after power fail and restoration 24 14.5 Electrical bonding and grounding .25 15 Instrumentationandcontrolsystem 25 15.1 Gasdetection .25 15.2 Emergency shutdown devices .25 16 Emergency shutdown .26 16.1 Emergency shutdown procedure .26 iii vithoutlicense from IHS