FprEN ISO 16924

SLOVENSKI STANDARD
oSIST prEN ISO 16924:2025
01-februar-2025
Polnilne postaje za oskrbo z zemeljskim plinom - Postaje za oskrbo vozil z
utekočinjenim zemeljskim plinom (ISO/DIS 16924:2024)
Natural gas fuelling stations - LNG stations for fuelling vehicles (ISO/DIS 16924:2024)
Gasfüllanlagen - LNG Füllanlagen zur Betankung von Fahrzeugen (ISO/DIS
16924:2024)
Stations-service de gaz naturel - Stations GNL pour le ravitaillement de véhicules
(ISO/DIS 16924:2024)
Ta slovenski standard je istoveten z: prEN ISO 16924
ICS:
75.060 Zemeljski plin Natural gas
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
oSIST prEN ISO 16924:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 16924:2025
oSIST prEN ISO 16924:2025
DRAFT
International
Standard
ISO/DIS 16924
ISO/TC 340
Natural gas fuelling stations — LNG
Secretariat: AFNOR
stations for fuelling vehicles
Voting begins on:
Stations-service de gaz naturel — Stations GNL pour le
2024-12-19
ravitaillement de véhicules
Voting terminates on:
ICS: 75.200 2025-03-13
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
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WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 16924:2024(en)
oSIST prEN ISO 16924:2025
DRAFT
ISO/DIS 16924:2024(en)
International
Standard
ISO/DIS 16924
ISO/TC 340
Natural gas fuelling stations — LNG
Secretariat: AFNOR
stations for fuelling vehicles
Voting begins on:
Stations-service de gaz naturel — Stations GNL pour le
ravitaillement de véhicules
Voting terminates on:
ICS: 75.200
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
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TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
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Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 16924:2024(en)
ii
oSIST prEN ISO 16924:2025
ISO/DIS 16924:2024(en)
Contents Page
Foreword .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 3
4 Abbreviated terms . 10
5 Risk management . 10
5.1 Risk assessment .10
5.1.1 General .10
5.1.2 Protection against overpressure .11
5.1.3 Static electricity .11
5.2 Fire protection .11
5.2.1 Hazardous area classification.11
5.2.2 Sources of ignition . 12
5.2.3 Fire fighting . 12
5.3 Explosion protection measures . 12
6 General design requirements .13
6.1 General . 13
6.1.1 Design philosophy . 13
6.1.2 Buildings and civil works . 13
6.1.3 Installation and construction .14
6.2 Site layout . 15
6.2.1 Separation distances . 15
6.2.2 Traffic management . . 15
6.2.3 Security . .16
6.2.4 Requirements for location of equipment .16
6.3 Environmental considerations .16
6.3.1 Noise attenuation .16
6.3.2 Prevention of venting of natural gas .16
7 Fuel supply to the fuelling station . 17
7.1 Application .17
7.2 Equipment compatibility .17
7.3 Filling connector .17
7.4 Requirements for filling .18
7.4.1 General requirements .18
7.4.2 Prevention of overpressurization and overfilling .19
7.5 Prevention of back flow .19
7.6 Bleed connections .19
7.7 Draining of liquid from the LNG storage tank .19
7.8 LNG tanker .19
7.8.1 Immobility . .19
7.8.2 Anti-drive-away equipment . 20
7.8.3 Turning off the engine . 20
7.8.4 Equalizing the potentials . 20
8 Storage .20
8.1 LNG storage . 20
8.1.1 Design and construction . 20
8.1.2 Safety requirements . 22
8.1.3 Installation guidance . 25
8.2 CNG buffer storage . 26
9 Pumps and compressors .26
9.1 Connection of LNG pumps to the LNG storage tank . 26
9.1.1 General . 26

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oSIST prEN ISO 16924:2025
ISO/DIS 16924:2024(en)
9.1.2 NPSH requirements .27
9.1.3 Vapour return .27
9.1.4 Protection against weather .27
9.1.5 Accessibility .27
9.2 LNG centrifugal pump (including ancillaries) .27
9.2.1 General provisions .27
9.2.2 Liquid inlet to the centrifugal pump .27
9.2.3 Centrifugal pump design .27
9.2.4 Vibration . 28
9.2.5 Detection of shaft seal leak . 28
9.2.6 Detection of cavitation . 28
9.3 LNG reciprocating pump for LCNG fuelling stations (including ancillaries) . 28
9.3.1 General provisions . 28
9.3.2 Liquid supplied to the reciprocating pump . 28
9.3.3 Design . 28
9.3.4 Vibration . 28
9.3.5 Pulsation . 29
9.4 Commonalities for LNG centrifugal and reciprocating pumps . 29
9.4.1 Suction line . 29
9.4.2 Instrumentation. 29
9.4.3 Markings of a pump . 29
9.4.4 Instructions . 30
9.5 Natural gas compressor. 30
10 Dispensers .30
10.1 LNG dispensers . 30
10.1.1 General requirements . 30
10.1.2 Breakaway system . .32
10.1.3 Fuelling hoses .32
10.1.4 Fuelling nozzles . 33
10.1.5 Dispenser enclosure . 34
10.1.6 Other requirements . 34
10.2 CNG dispensers . 35
11 Vaporizers and heaters .35
11.1 Application . 35
11.2 Design of vaporizers and heaters . 35
11.3 Ambient air vaporizer . 36
11.3.1 General . 36
11.3.2 Defrosting . 36
11.3.3 Aluminium vaporizers . 36
11.4 Electric vaporizer/heater .37
11.5 Water bath vaporizer .37
11.6 Fired vaporizers .37
11.7 Remotely heated vaporizers .37
12 Odorization .37
12.1 General requirements .37
12.2 High-pressure odorizer. 38
12.3 Safety. 38
12.4 Monitoring . 38
12.5 Odorant. 39
12.5.1 Dynamics of function . 39
13 Pipework.39
13.1 General . 39
13.2 Pipework design . 39
13.2.1 General . 39
13.2.2 Overground pipework . 40
13.2.3 Underground pipework . 40
13.2.4 Pipework in ducts . 40

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ISO/DIS 16924:2024(en)
13.2.5 Flexible connections . . .41
14 Electrical equipment and wiring . 41
14.1 General .41
14.2 Main considerations.41
14.2.1 Grounding .41
14.2.2 Lightning .41
14.2.3 Contact with live parts . . .41
14.2.4 Cables . .41
14.2.5 Static electricity .42
14.3 Other considerations .42
14.3.1 Interface .42
14.3.2 Primary seal .42
14.3.3 Additional seal .42
14.3.4 Conduit seals .42
14.3.5 Detection vents .43
15 Instrumentation and control system .43
15.1 General .43
15.2 Gas detectors .43
15.3 Flame detectors .43
15.4 Pressure gauges .43
15.5 Temperature sensors .43
15.6 Manual emergency shutdown devices .43
15.7 Uninterruptible Power Supply Unit (UPS) . 44
16 Emergency shutdown .44
16.1 Application . 44
16.2 Procedure . 44
16.3 Activation . 44
16.4 ESD action .45
16.5 Reset .45
17 Special configurations .45
17.1 Movable LNG fuelling station .45
17.1.1 General requirements .45
17.1.2 Anchoring .45
17.1.3 Containment . 46
17.2 Mobile LNG fuelling station . 46
17.2.1 General requirements . 46
17.2.2 Anchoring . 46
17.2.3 Containment . 46
17.2.4 Design . 46
17.2.5 Additional requirements for operation . 46
18 Testing and commissioning . 47
18.1 Testing .47
18.1.1 Electrical testing .47
18.1.2 Pressure strength testing .47
18.1.3 Leak testing.47
18.2 Commissioning . 48
18.2.1 General provisions . 48
18.2.2 Purging . 48
18.2.3 Functional testing . 48
18.2.4 First filling of the LNG storage tank and other components . 48
19 Operations .49
19.1 LNG tanker unloading . 49
19.2 Fuelling procedure . 49
19.3 Safety signs . 49
19.3.1 General on identification labels . 49
19.3.2 Equipment marking . 50

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oSIST prEN ISO 16924:2025
ISO/DIS 16924:2024(en)
19.4 Equipment and pipework identification . 50
19.5 Training .51
19.6 Installation and operating instructions .51
19.7 Emergency plan .52
19.8 Maintaining the emergency shutdown .52
20 Inspection and maintenance .52
20.1 Inspection .52
20.1.1 General requirements .52
20.1.2 Inspection and testing of electrical systems . 53
20.1.3 Inspection and re-testing of the safety relief valves . 53
20.1.4 Safety and fire protection equipment . 53
20.2 Maintenance . 54
20.2.1 Preventive maintenance planning . 54
20.2.2 Maintenance procedures. 54
20.2.3 Maintenance safety . 54
20.2.4 Draining of the LNG storage tank . 54
Annex A (informative) Examples of hazardous zones classification .55
Annex B (normative) Separation distances .59
Annex C (informative) Example flow diagram of an LNG fuelling station .63
Annex D (informative) Example flow diagram of an LCNG fuelling station .64
Annex E (informative) Example flow diagram of an LNG and LCNG fuelling station .65
Annex F (informative) Process requirements for the effective cryogenic pump operation .66
Annex G (informative) Recommendations for installation of a centrifugal pump . 67
Annex H (informative) Recommendations for centrifugal pump design .68
Annex I (informative) Recommendations for installation of a reciprocating pump .69
Annex J (informative) Recommendations on the content of the cryogenic pump operation
instructions .71
Annex K (informative) LNG identification mark of an LNG fuelling station .73
Annex L (informative) Explosion-proof Static Grounding Control System . 74
Bibliography .75

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oSIST prEN ISO 16924:2025
ISO/DIS 16924:2024(en)
Foreword
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