INTERNATIONAL STANDARD ISO 16923 First edition 2016-12-15 Natural gas fuelling stations — CNG stations for fuelling vehicles Stations-service de gaz naturel — Stations GNC pour le ravitaillement de véhicules Reference number ISO 16923:2016(E) I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n © ISO 2016 ISO 16923:2016(E) COPYRIGHT PROTECTED DOCUMENT © ISO 2016, Published in Switzerland All rights reserved Unless otherwise specified, no part o f 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 o f the requester ISO copyright o ffice Ch de Blandonnet • CP 401 CH-1214 Vernier, Geneva, Switzerland Tel +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ii I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n ISO 16923:2016(E) Contents Page Foreword v Scope Normative references Terms and definitions Symbols and abbreviated terms 4.2 Abbreviated terms Risk management General design requirements 6.1 General 10 f f 10 Fuel supply to the fuelling station 11 11 11 Dryer 12 Compressors 12 9.1 General 12 9.2 Instrumentation and control 13 9.3 Crankcase design 13 9.4 Compressor enclosures, buildings and canopies 14 9.5 Underground compressor installations 16 16 10 Buffer storage 16 11 Dispensers 17 11.1 General requirements 17 17 11.3 Fuelling hose assemblies 18 11.4 Fuelling hoses 19 11.5 Enclosure 19 11.6 Fuelling controls and instrumentation 20 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 live parts 24 14.3 Cables 24 14.4 Performance after power fail and restoration 24 14.5 Electrical bonding and grounding 25 15 Instrumentation and control system 25 15.1 Gas detection 25 25 16 Emergency shutdown 26 26 Symb o ls 6.2 S ite layo ut 6.3 Pres s ure s a ety relie 7.1 S up p ly by p ip eline 7.2 S up p ly by mo b ile s to rage 9.6 H azardo us area clas s ificatio n 1 B reakaway devices 1 E lectrical sys tems and interco nnectio ns E mergency s hutdo wn devices 6.1 E mergency s hutdo wn p ro cedure © ISO 2016 – All rights reserved I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n valves and venting iii ISO 16923:2016(E) 6.2 17 Res to ratio n a fter emergency s hutdown Indoor fuelling 26 General Ventilation Additional requirements 18 Testing and commissioning 27 19 Operation 28 20 Fuelling procedures 9.2 S a fety s igns Training 9.4 E mergency res p o ns e p lan 9 O perations manual Inspection and maintenance 29 I nspection and maintenance p rogram 0.2 M aintenance and tes ting Annex A (informative) E x a m p l e s o f h a frequency z a r d o u s z o f gas detectio n o n e c l a s s i f i c a t i o n 31 Annex B (normative) Separation distances 38 Annex C (informative) Fuelling procedures 39 Annex D (informative) Emergency instructions example 40 Annex E (informative) Example of fuelling station periodic inspection and maintenance 41 Bibliography 43 iv I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n ISO 16923:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work o f preparing International Standards is normally carried out through ISO technical committees Each member body interested in a subject for which a technical 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 with the International Electrotechnical Commission (IEC) on all matters o f electrotechnical standardization The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part In particular, the different approval criteria needed for the di fferent types o f ISO documents should be noted This document was dra fted in accordance with the editorial rules of the ISO/IEC Directives, Part (see www.iso.org/directives) Attention is drawn to the possibility that some o f the elements o f this document may be the subject o f patent rights ISO shall not be held responsible for identi fying any or all such patent rights Details o f any patent rights identified during the development o f the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) Any trade name used in this document is in formation given for the convenience o f users and does not constitute an endorsement For an explanation on the meaning o f ISO specific terms and expressions related to formity assessment, as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html The committee responsible for this document is ISO/PC 252, Natural gas fuelling stations for vehicles © ISO 2016 – All rights reserved I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n v I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n INTERNATIONAL STANDARD ISO 16923:2016(E) Natural gas fuelling stations — CNG stations for fuelling vehicles Scope This document covers the design, construction, operation, inspection and maintenance of stations for fuel l i ng compre s s e d natu l gas (C NG) to veh icle s , i nclud i ng e qu ipment, s a fe ty a nd control device s This document also applies to portions of a fuelling station where natural gas is in a gaseous state and d i s p en s i ng C NG deri ve d from T h i s c u ment appl ie s to l iquefie d natu l gas (LC NG) accord i ng to I S O 169 fuel l i ng s tation s s uppl ie d with natu l ga s a s defi ne d i n lo c a l appl ic able gas composition regulations or ISO 13686 It also applies to other gases meeting these requirements including biomethane, upgraded coal-bed methane (CBM) and gas supplies coming from LNG vaporization (on-site or off-site) T h i s c u ment i nclude s a l l e qu ipment for down s tre am gas s upply ne c tion (i e p oi nt o f s ep aration between the CNG fuelling station piping and the pipeline network) Fuelling station nozzles are not defi ne d i n th i s c u ment This document covers fuelling stations with the following characteristics: — s low fi l l; — fas t fi l l; — private acce s s; — pub l ic acce s s (s el f- s er vice or as s i s te d) ; — fuel l i ng s tation s with fi xe d s torage; — fuel l i ng s tation s with mobi le s torage (daughter s tation) ; — multi-fuel stations This document is not applicable to domestic CNG fuelling devices without buffer storage NOTE This document is based on the condition that the gas entering the fuelling station is odorized For Clause 10 f f u no dor i z e d ga s uel l i n g s tation s , add ition a l s a e ty re qu i rements a re i nclude d i n Normative references T he fol lowi ng c u ments a re re ferre d to in te xt i n s uch a way that s ome or all o f thei r content s titute s re qu i rements o f th i s c u ment For date d re ference s , on ly the e d ition cite d appl ie s For u ndate d re ference s , the late s t e d ition o f the re ference d c ument (i nclud i ng a ny amend ments) appl ie s ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation ISO 834-1, Fire-resistance tests — Elements of building construction — Part 1: General requirements ISO 4126-1, Safety devices for protection against excessive pressure — Part 1: Safety valves ISO 8580, Rubber and plastics hoses — Determination of ultra-violet resistance under static conditions © ISO 2016 – All rights reserved I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n ISO 692 : 01 6(E) I SO 9 -1 , Gas cylinders — Refillable seamless steel gas cylinders — Design, construction and testing — I SO 9 -2 , Gas cylinders — Refillable seamless steel gas cylinders — Design, construction and testing — Part 1: Quenched and tempered steel cylinders with tensile strength less than 100 MPa Part 2: Quenched and tempered steel cylinders with tensile strength greater than or equal to 100 MPa I SO 11119 -1 , Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and testing —Part 1: Hoop wrapped fibre rein forced composite gas cylinders and tubes up to 450 l Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and testing — Part 2: Fully wrapped fibre rein forced composite gas cylinders and tubes up to 450 l with load- I SO 11119 -2 , sharing metal liners Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and testing — Part 3: Fully wrapped fibre rein forced composite gas cylinders and tubes up to 450L with nonI SO 11119 -3 , load-sharing metallic or non-metallic liners Gas cylinders — High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles I SO 1143 9, Reaction to fire tests — Ignitability of building products subjected to direct impingement of flame — Part 3: Multi-source test I SO 1192 -3 , I SO 10 , Safety of machinery — General principles for design — Risk assessment and risk reduction I SO 47, Petroleum and natural gas industries — Pipeline transportation systems — Welding of pipelines I SO 141 , Safety of machinery — Guards — General requirements for the design and construction of fixed and movable guards 5 0 -2 , Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2: Performance and general test methods I SO I SO 5 0 -17, fuel line Road vehicles — Compressed natural gas (CNG) fuel system components — Part 17: Flexible I SO 5 -1 , Petroleum, petrochemical and natural gas industries — Cathodic protection of pipeline systems — Part 1: On-land pipelines I SO 49, Petroleum and natural gas industries — Piping I EC 1010 , Risk management — Risk assessment techniques I EC 0 79 - , Electrical apparatus for explosive gas atmospheres — Part 0: General requirements I EC 0 79 -10 -1 , I EC 0 79 -11 , I EC 60 079 -14, Explosive atmospheres — Part 10-1: Classification of areas — Explosive gas atmospheres Explosive atmospheres — Part 11: Equipment Protection by Intrinsic Safety “i” Electrical apparatus for explosive gas atmospheres — Part 14: Electrical installations in hazardous areas (other than mines) I EC 0 79 -2 , I EC 02 -1 , I EC 52 9, Explosive atmospheres — Part 25: Intrinsically safe electrical systems Safety of machinery — Electrical equipment of machines — Part 1: General requirements Degrees of protection provided by enclosures (IP Code) Terms and definitions For the pu rp o s e s o f th i s c ument, the I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n fol lowi ng term s and defi nition s apply ISO 16923:2016(E) ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia.org/ — ISO Online browsing platform: available at http://www.iso.org/obp 3.1 assembly s ub - s ys tem o f fuel l i ng s tation s compri s i ng s evera l comp onents 3.2 auto-extinguishing fe atu re o f a materia l that ce as e s combu s tion up on remova l o f fl ame or ign ition s ou rce 3.3 biomethane me thane rich ga s derive d from bio ga s or similar to natural gas [SOURCE: ISO 14532:2014, 2.1.1.15] from ga s i fic ation o f bioma s s b y up grad i ng with the prop er tie s 3.4 bonding e quip o tenti a l z one where p o tentia l ly l ive exp o s e d me ta l l ic p ar ts are ele c tric a l ly ne c te d with at least one point connected to ground/earth 3.5 breakaway device coupling which separates at a predetermined section when required and each separated section conta i n s a s el f- clo s i ng s hut- o ff va lve wh ich s e a l s automatic a l ly [SOURCE: ISO/TS 18683:2015, 3.1.3] 3.6 buffer storage one or more suitable pressure vessels designed for the purpose of storing compressed natural gas 3.7 building s truc tu re s , u s ua l ly enclo s e d b y wa l l s and a ro o f, s tr uc te d to provide s upp or t or shelter for an i ntende d o cc up a nc y 3.8 burst pressure pb pre s s u re that c au s e s fa i lu re and s e quenti a l flu id lo s s th rough the comp onent envelop e 3.9 canopy roof, overhead shelter, or hood, that affords a degree of weather protection 3.10 CNG fuelling station fac i l ity at wh ich compre s s e d natura l gas i s d i s p en s e d to veh icle s 3.11 competent person p ers on havi ng the abi l ity, appropriate trai n i ng , knowle dge and e xp erience, to s up er vi s e or c arr y out the work being undertaken in a safe and proper manner © ISO 2016 – All rights reserved I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n ISO 16923:2016(E) 3.12 compressed natural gas C NG natural gas which has b een compres s ed and s tored for us e as a vehicle fuel [SOURC E: I SO 5 0 -1 : 0 , ] 3.13 compressor machine that increases the pres s ure of gas 3.14 conduit cas ing, tubing or liner, either metal l ic or non-metal lic [SOURC E: I SO 143 10 : 0 , 6] 3.15 cylinder pres s ure ves sel used for the s torage of compres sed natural gas 3.16 cylinder working pressure s e ttle d pre s s ure o f a fu l ly fi l le d c yl i nder at a u n i form temp eratu re o f ° C 3.17 dispenser equipment through which the fuel is s upplied to the vehicle N o te to entr y: T h i s e qu ipment c a n i nclude me ter i n g 3.18 dryer equipment which decreases the water vap our content (mois ture) of natural gas 3.19 enclosure s truc ture, no t b ei ng a bu i ld i ng or c anop y, that enclo s e s a comp onent o f the E X AM PLE fuel l i ng s tation H ou s i ng , contai ner and mach i ne c abi ne t 3.20 explosive gas atmosphere mi xture of s ub s tances with air, under atmos pheric conditions , in the form of gases , vap ours , mis ts or dus ts in which, after ignition has o ccurred, combus tion s preads to the entire unburned mi xture [SOURC E: I EC 61 40 – - 4: 014, 11 , 4] 3.21 fail-safe des ign feature that en s ures that s afe conditions are maintained in the event of a mal func tion of a control device or an i nterrup tion o f a s upply s ource 3.22 f a s t f i l l fuel l i ng op eration wh ich s a de s igne d flow rate gre ater th an 10 m (N )/ h p er no zz le 3.23 f i e l d p i p i n g piping ins tal led for interconnec tion b etween equipment at the s ite I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n ISO 16923:2016(E) 20.2 Maintenance and testing frequency of gas detection 20.2.1 The gas detectio n sys tem s hall b e maintained in acco rdance with the s ervice requirements o f the manu facturer The s ervice frequency s hall b e o nce p er year as a minimum, o r mo re o ften i f s o s p ecified by the manu facturer 20.2.2 M aintenance s hall b e p er fo rmed by co mp etent p ers o ns 20.2.3 The following periodic maintenance actions shall be performed as a minimum: — e ach ga s de te c tor sha l l b e c a l ibrate d — the enti re s ys tem s l l b e che cke d fol lowi ng for pro ce du re s s p e ci fie d b y the manu fac tu rer; the de s i re d s e tti ngs; — an overall function test shall be performed including the associated actions (see Clause 16 ) ; — an operation test shall be performed 20.2.4 Special attention shall be given to detectors that are in an environment where pollution is influencing the o p eratio n, o r detecto rs that are exp o s ed to s ub s tances which reduce the li fetime o f the detector 20.2.5 All maintenance operations shall be recorded in a fuelling station log 30 I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n ISO 16923:2016(E) Annex A (informative) E x a m p l e s o f h a z a r d o u s z o n e c l a s s i f i c a t i o n Figures A.1 to A.9 on hazardous zones is informative and represents maximum extent of zone for the f f methods e quipment s hown T he ex tent o zone may b e re duce d b a s e d on app l ic ation o I E C 0 79 -10 -1 pro te c tion Dimensions in millimetres Key Zone area: enclosed compressor Zone area NO TE H a z a rdou s z o ne s for ga s d r yi n g e qu ip ment c a n b e s idere d identic a l Figure A.1 — Hazardous zones for enclosed CNG compressors © ISO 2016 – All rights reserved I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n 31 ISO 16923:2016(E) Dimensions in millimetres Key NOTE enclosed compressor with ventilation and gas detection The ventilation rate should provide a minimum of six air changes per hour (ACH) The enclosed space may b e de cl a s s i fie d to Z one with the add ition o f conti nuou s me ch a n ic a l venti l ation th at i s p roven b y u s i n g a flow s witch or o ther de vice th at wi l l i s o l ate p ower to the enclo s e d s p ace i n the e vent o f a lo s s o f venti l ation , or ga s de te c tion a nd venti l ation i n wh ich i f a ga s concentration o f % lower fl a m m ab le l i m it ( L F L) o r gre ater i s de te c te d , the venti l ation fa n wi l l op erate a nd i f a ga s co ncentration o f % L F L i s de te c te d , p ower wi l l b e isolated from the enclosed space Figure A.2 — Hazardous zones for enclosed and ventilated CNG compressors Dimensions in millimetres NOTE Shelters with at least three of four walls open and a ventilated roof can also be considered unenclosed Figure A.3 — Hazardous zones for unenclosed CNG compressors 32 I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n ISO 16923:2016(E) Dimensions in millimetres a) Side view b) Top view [from a to a in diagram a)] Key Zone area CNG equipment: compressor, storage and ancillaries gas tight wall general purpose electrical equipment Distances a, b, c and d are zones that can be extended as applicable NOTE Figure A.4 — Hazardous areas around CNG equipment separated by a gas tight wall © ISO 2016 – All rights reserved I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n 33 ISO 16923:2016(E) Key buffer vessel NO TE D i men s ion R i s me a s u re d o f the bu ffer s to rage a s s emb l y a s p er fro m a ny o p en i n g i n the bu ffer ve s s el i n accord a nce with the aggre gate s i z e Table A.1 Figure A.5 — Hazardous zones around a buffer storage Table A.1 — Extent of zone for buffer storage volumes Total buffer storage volume capacity l Up to and including 000 From 001 to 10 000 Over 10 000 Key Dimension R mm 500 000 10 000 enclosed space NOTE Dimensions R are shown in Table A.2 NOTE The CNG hose and nozzle connection point are not considered to create a hazardous zone Figure A.6 — Hazardous zone around a CNG dispenser 34 I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n ISO 16923:2016(E) Table A.2 — Extent of zone for CNG dispenser Dimension R Application b y c a lc u l atio n o r b y the u s e o f pro te c tio n s ys tem s th at i nclude ga s tight p a r tition s o r wa l l s , pre s s u r i s atio n As determined T he e x tent o f z one d i men s ion R m ay b e de term i ne d i n acco rda nce with I E C 0 79 -10 -1 cer ti fic ation (from safe area), gas detection, ventilation, continuous vapour barriers and other means See example zone for C-Frame dispensers in Figure A.7 f Us e o cer ti fie d p ro te c tion s ys tem s m ay a l s o b e app l ie d 000 mm T h i s de fau lt d i men s ion s hou ld b e ap p l ie d without de s ign s p e c i fic c a lc u l ation e vidence i n accord a nce with I E C 0 -10 -1 or cer ti fie d pro te c tion s ys tem s Dimensions in millimetres Key enclosed space electro nic dis p lay Figure A.7 — Hazardous zone around a “C” Frame type CNG dispenser © ISO 2016 – All rights reserved I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n 35 ISO 16923:2016(E) D imensions in millimetres Key vent stack D vent o rifice diameter (p ip e I D ) d diameter NO TE Fo r s a fe ty rel ie f va l ve vents , the or i fice d i a me ter, D, i s the no m i n a l outle t p or t s i z e o f the rel ie f va l ve Figure A.8 — Hazardous zone around a vent Table A.3 — Hazardous zones around piping and valves Location P ip e a nd tub e l i ne s j o i ne d b y th re ade d fitti n gs , tub e fi tti n gs , weld i n g , fl a n ge s i nclud i n g b lo ck va lve s , che ck va lve s , pre s s u re gage s a nd l i ne i n s tr umentatio n device s P ro ces s control va lves i nclud- Extent of hazardous location Zone Unenclo s ed O utdo ors Uncl a s s i fie d Uncl a s s i fie d E nclo s ed with ade - To extent of enclo s ed are a Z one O uts ide of enclo s e d a rea Uncl a s s i fie d To extent of enclo s ed are a Z one 1 0 m m from enclo s e d area Z one With i n 0 m m of the p oint of Z one quate venti lation a E nclo s ed with i nade quate venti lation Unenclo s ed O utdo ors i ng regu lators , b ack pres s ure va lves , ac tuated va lves and mo du lating va lves releas e (s ee Figu re A 9) E nclo s ed with ade quate venti lation a E nclo s ed with i nade quate venti lation a 36 To extent of enclo s ed are a Z one O uts ide of enclo s e d a rea Uncl a s s i fie d To extent of enclo s ed are a Z one 0 m m from enclo s ed are a Z one Ade quate venti l atio n s ho u ld b e de s igne d a nd pro ve d i n acco rda nce with I E C 0 79 -10 -1 I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n ISO 16923:2016(E) Dimensions in millimetres NOTE A control valve includes a regulator, back pressure valve, actuated valve, modulating valve and other valve with moving seals that wear with use Figure A.9 — Hazardous zone around a control valve in open air © ISO 2016 – All rights reserved I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n 37 ISO 16923:2016(E) Annex B (normative) Separation distances B.1 General A sep aration dis tance is the minimum sep aration b etween a hazard source (an ins tal lation comp onent with a hazardous substance) and the potentially a ffected object o f the hazard (a person, vulnerable ins tal lation comp onent or bui lding within the es tabl ishment) , with the purp ose of preventing or limiting the harmful effec t as a res ult of a foreseeable incident and hence preventing either an escalation to a bigger incident (domino e ffect), in the case o f internal separation distances or e ffects to external objects, in the case of external sep aration dis tances A foreseeable incident in one ins tal lation comp onent cou ld not lead to the (p ar tial) fai lure of another ins tal lation comp onent An internal sep aration dis tance there fore prevents a relatively small incident developing into a big incident Adequate internal separation distances are hence a condition for sa fe execution o f the CNG delivery installation B.2 External separation distances C NG fuel ling s tation external sep aration dis tances are not required to exceed those for other liquid fuel s B.3 Internal separation distances I nternal sep aration dis tances shal l b e determined in accordance with Table B Table B.1 — Internal separation distances Hazard source Total site storage below 10 000 l Dispenser Storage cylinders and compressor B ui ldi ngs op eni ngs >3 m >3 m B ui ldi ng wa l l s (non- combus tible) ≥0m >1 m >5 m >5 m (>10 m for s torage > 10 0 l) Facility perimeter I f a h fire wall is located between CNG equipment and the property line, the separation distance may be reduced to m The fire wall shall have a minimum height equal to 0,5 m greater than the maximum height o f the equipment and shall limit the hazardous zone from crossing the property line 38 I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n ISO 16923:2016(E) Annex C (informative) Fuelling procedures C.1 Fast fuelling procedure (typical) The procedure for fast fuelling should be posted at each dispenser and should be similar to the following: a) no t u s e mobi le phone s or ele c tric a l appl i ance s; b) tu rn o ff engi ne; c) remove the du s t plug d) attach the e) authori ze the d i s p en s er; f) on comple tion o f the fi l l, c are fu l ly d i s ne c t the fi l l no z z le; a s ma l l e s c ap e o f gas fuel l i ng from the veh icle re fuel l i ng re cep tacle; no z z le to the re fuel l i ng re cep tacle; from the fuel l i ng no z z le c an o cc ur at th i s ti me; g) re turn the no z z le to the holder on the d i s p en s er; h) refit the du s t plug/c ap If fuel l i ng i s p er forme d from a mu lti- fuel d i s p en s er, on ly one s ame veh icle D i fferent veh icle s may b e dispenser C S l o w f u T he pro ce dure following: e l l for i n g p ti me r o c e d u r e ( s fuel l i ng s hou ld l fuel le d o w - f i l l with d i fferent fuel at a ti me shou ld b e del ivere d to the fuel s on d i fferent s ide s o f the mu lti- fuel ) b e p o s te d at e ach ti me fi l l d i s p en s er and s hou ld b e s i m i lar to the a) tu rn o ff engi ne; b) remove the du s t plug c) attach the d) op en the e) a fter the e xp e c te d fi l l ti me h as el ap s e d a nd the veh icle ve s s el(s) i s/are fuel l i ng fuel from the veh icle re fuel l i ng re cep tacle; no z z le to the re fuel l i ng re cep tacle; va lve on the fi l l p o s t; fu l l, clo s e the fuel va lve on the ti me fi l l d i s p en s er, f) c a re fu l l y d i s co n ne c t the fi l l no z z le ; a s m a l l e s c ap e o f ga s fro m the fue l l i n g no z z le c a n o cc u r at th i s ti me; g) re turn the fi l l no z z le to the no z z le holder on the ti me fi l l d i s p en s er; h) refit the du s t plug/c ap © ISO 2016 – All rights reserved I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n 39 ISO 16923:2016(E) Annex D (info rmative) Emergency instructions example Actions to carry out in case o f fire or serious gas leakage o f a fuelling station: a) press the emergency shutdown device (button); b) extinguish all ignition sources, also in the buildings (pilot lights) and in the surrounding area; c) turn o ff engines; d) noti fy the fire brigade, tel 000-00000; e) noti fy the operator, name: f , tel 000-00000; ) noti fy people in the vicinity and direct them to a sa fe area; g) not use electrical switches (i.e light switches and other contact type switches); h) 40 no t s tar t engi ne s I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n ISO 16923:2016(E) Annex E (informative) Example of fuelling station periodic inspection and maintenance T h i s mai ntena nce s che du le provide d i s a n i n formative e xa mple on ly Fuel l i ng s tation op erators s hou ld determine a maintenance schedule that considers the particular fuelling station design, environmental f f f f and wear Not all maintenance items listed need to be applicable to a particular installation and some items can be missing The fuelling station owner should develop a customized maintenance schedule and develop safe maintenance intervals based on fuelling station experience and inspection requirements based on local regulating authorities It is recommended that fuelling station maintenance intervals cond ition s , uel l i ng lo ad s , op erati ng hou rs , re quenc y o u s e and o ther ac tors i mp ac ti ng e qu ipment u s e remai n s er vative (s hor ter) i n iti a l ly and then ex tende d on ly i f exp erience warra nts it T he p ers on or orga ni z ation re s p on s ib le for the op eration o f the fuel l i ng s tation s hou ld c arr y out, the mai ntena nce me as u rements , i n s p e c tion s or che ck-up s s tate d i n th i s c u ment O n ly trai ne d a nd competent persons (own or subcontracted) should perform the tasks The results should be stored and kep t avai lable for i n s p e c tion b y authoritie s for at le a s t th re e s ub s e quent i n s p e c tion p erio d s or for the p erio d s p e c i fie d b y the appl ic able nationa l or lo c a l re gu lation s Maintenance of each piece of equipment should follow the manufacturer’s instructions An example of scheduled maintenance is provided in Table E.1 I n- s er vice d i s p en s er ho s e s may b e che cke d for conti nue d conti nu ity, but on ly us i ng a low-voltage oh m meter approved for use in hazardous atmospheres Table E.1 — Example of a scheduled maintenance Maintenance and inspection schedule General Overall fuelling station inspection f f C he ck re p a i r a nd vi s ib i l i t y o sa e Weekly Monthly Interval months year X C he ck fi re e x ti n gu i s her p re s s u re as required Repl ace fi re e x ti ngu i s hers External visual check Isolation valve functional check Internal inspection C he ck for draining F l a n g e s , conden s ate i n ve s s el s b y f i t t i n g s a n d p i p i n © ISO 2016 – All rights reserved X X X as required g Corrosion check Damage check Leakage check Check earth leakage buried of steel piping I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n years X X ty s igns Buffer storage vessels and other vessels years X X X X 41 ISO 16923:2016(E) Table E.1 (continued) Maintenance and inspection schedule Weekly Monthly Interval months year years years Valves Functional check of valves X ESD function check X Safety relief valve Visual inspection X Recalibration as required Vent pipe blockage check X Gas dryer X Dewpoint check Change desiccant as required Instrumentation Functional test of pressure switches/transmitters Recalibration of pressure switches/ transmitters Check pressure gauges X Gas detector functional check X Gas detector calibration X Dispenser X Wear and damage inspection of CNG nozzle X Hose damage check Vi s u a l che ck o f bre a kaway X Leakage check of nozzle X L e a kage che ck o f b re a kaway X X C heck conduc tivity o f ho se as s embly C he ck valves fu nc tio n i ng o f e xce s s flow X D i s p en s er fi l l pre s s u re c a l ib ratio n X check Pressure transmitter calibration Equipment bonding and ground B ond i n g conti nu ity che ck X B o nd i n g co nti nu i ty to e a r th X ground check H a z a r d o u s z o n e v e r i f i c a t i o n X C he ck i nte gr ity o f h a z a rdo u s z one s Documentation Veri fy lo gb o ok entr ie s X Enter repairs and inspection data X Enter calibration data Enter cathodic protection data 42 I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n X X ISO 16923:2016(E) Bibliography [1] [2] [3] [4] ISO 6406, Gas cylinders — Seamless steel gas cylinders — Periodic inspection and testing ISO 7010, Graphical symbols — Safety colours and safety signs — Registered safety signs ISO 10461, Gas cylinders — Seamless aluminium-alloy gas cylinders — Periodic inspection and testing ISO 11119-4, Gas cylinders — Refillable composite gas cylinders — Design, construction and testing — Part 4: Fully wrapped fibre rein forced composite gas cylinders up to 150 l with load- sharing welded metallic liners [5] [6] [7] [8] ISO 11623, Gas cylinders — Composite construction — Periodic inspection and testing ISO 13686, Natural gas — Quality designation ISO 13734, Natural gas — Organic components used as odorants — Requirements and test methods ISO/TR 14121-2, Safety ofmachinery — Risk assessment — Part 2: Practical guidance and examples [9] ISO 15403-1, Natural gas — Natural gas for use as a compressed fuel for vehicles — Part 1: Designation of the quality of methods [10] ISO 15403-2, Natural gas — Natural gas for use as a compressed fuel for vehicles — Part 2: Specification of the quality ISO 14469 1) , Road vehicles — Compressed natural gas (CNG) refuelling connector [11] [12] IEC 60079-1, Explosive atmospheres — Part 1: Equipment protection by flame-proof enclosures “d [13] IEC 60079-29-1, Explosive atmospheres — Part 29-1: Gas detectors — Performance requirements of detectors for flammable gases [14] IEC 60079-29-2, Explosive atmospheres — Part 29-2: Gas — Selection, installation, use and maintenance of detectors for flammable gases and oxygen [15] IEC 61340-4-4, Electrostatics — Part 4-4: Standard test methods for specific applications Electrostatic classification of flexible intermediate bulk containers (FIBC) [16] IEC 61508 (all parts), Functional safety of electrical/electronic/programmable electronic safetyrelated systems [17] IEC 61511 (all parts), Functional safety — Safety instrumented systems for the process industry sector 1) To be published Revises ISO 14469-1, ISO 14469-2 and ISO 14469-3 © ISO 2016 – All rights reserved I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n 43 ISO 692 : 01 6(E) I CS 75 00 Price based on 43 pages © ISO 2016 – All rights reserved I n tern ati o n al Org an i z ati o n fo r S tan d ard i z ati o n