ISO 16924
(Main)Natural gas fuelling stations — Liquefied natural gas (LNG) stations for fuelling road vehicles
Natural gas fuelling stations — Liquefied natural gas (LNG) stations for fuelling road vehicles
ISO 16924:2016 specifies the design, construction, operation, maintenance and inspection of stations for fuelling liquefied natural gas (LNG) to vehicles, including equipment, safety and control devices. ISO 16924:2016 also specifies the design, construction, operation, maintenance and inspection of fuelling stations for using LNG as an onsite source for fuelling CNG to vehicles (LCNG fuelling stations), including safety and control devices of the station and specific LCNG fuelling station equipment. NOTE Specific CNG equipment is dealt with in ISO 16923. ISO 16924:2016 is applicable to fuelling stations receiving LNG and other liquefied methane-rich gases that comply with local applicable gas composition regulation or with the gas quality requirements of ISO 13686. ISO 16924:2016 includes all equipment from the LNG storage tank filling connection up to the fuelling nozzle on the vehicle. The LNG storage tank filling connection itself and the vehicle fuelling nozzle are not covered in this document. ISO 16924:2016 includes fuelling stations having the following characteristics: - private access; - public access (self-service or assisted); - metered dispensing and non metered dispensing; - fuelling stations with fixed LNG storage; - fuelling stations with mobile LNG storage; - movable fuelling stations; - mobile fuelling stations; - multi-fuel stations.
Stations-service de gaz naturel — Stations de gaz naturel liquéfié (GNL) pour le ravitaillement de véhicules routiers
L'ISO 16924:2016 spécifie la conception, la construction, l'exploitation, la maintenance et l'inspection des stations-service de gaz naturel liquéfié (GNL) pour véhicules, dont les équipements et les dispositifs de sécurité et de contrôle. L'ISO 16924:2016 spécifie également la conception, la construction, l'exploitation, la maintenance et l'inspection des stations-service de gaz naturel liquéfié (GNL) servant également de site de ravitaillement des véhicules en gaz naturel comprimé (GNC), appelées stations-service de GNLC (gaz naturel liquéfié/comprimé), en couvrant les dispositifs de sécurité et de contrôle des stations et les équipements propres aux stations-service GNLC. NOTE Les équipements propres aux stations de GNC sont couverts par l'ISO 16923. L'ISO 16924:2016 s'applique aux stations-service ravitaillées en GNL et autres gaz liquéfiés riches en méthane conformes à la réglementation locale applicable aux compositions gazeuses ou aux exigences en matière de qualité des gaz de l'ISO 13686. L'ISO 16924:2016 couvre tous les équipements, du connecteur pour le dépotage de GNL dans réservoir de stockage GNL au pistolet de ravitaillement destiné aux réservoirs des véhicules. Le connecteur de ravitaillement du réservoir et le pistolet de ravitaillement des véhicules à proprement dits ne sont pas couverts par ce document. L'ISO 16924:2016 couvre toutes les stations-service présentant les caractéristiques suivantes: - accès privé; - accès public (self-service ou avec assistance); - borne de distribution de carburant avec ou sans compteur; - stations-service avec stockage de GNL fixe; - stations-service avec stockage mobile de GNL; - stations-service transportables; - stations-service mobiles; - stations-service multi-carburants.
General Information
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Standards Content (Sample)
FINAL DRAFT
International
Standard
ISO/FDIS 16924
ISO/TC 340
Natural gas fuelling stations —
Secretariat: AFNOR
Liquefied natural gas (LNG) stations
Voting begins on:
for fuelling road vehicles
2025-10-08
Voting terminates on:
2025-12-03
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 SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 16924:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 16924:2025(en)
International
Standard
ISO/FDIS 16924
ISO/TC 340
Natural gas fuelling stations —
Secretariat: AFNOR
Liquefied natural gas (LNG) stations
Voting begins on:
for fuelling road vehicles
Voting terminates on:
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 SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 16924:2025(en) © ISO 2025
ii
ISO/FDIS 16924:2025(en)
Contents Page
Foreword .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 3
4 Abbreviated terms . 10
5 Risk management .11
5.1 Risk assessment .11
5.1.1 General .11
5.1.2 Protection against overpressure .11
5.1.3 Static electricity . 12
5.2 Fire protection . 12
5.2.1 Fire protection measures . 12
5.2.2 Fire fighting . 13
6 General design provisions .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 .16
6.2.1 Separation distances .16
6.2.2 Traffic management . .16
6.2.3 Security . .16
6.2.4 Location of equipment .16
6.3 Environmental considerations .17
6.3.1 Noise attenuation .17
6.3.2 Prevention of venting of natural gas .17
7 Fuel supply to the fuelling station .18
7.1 Application .18
7.2 Equipment compatibility .18
7.3 Unloading connector .18
7.4 Requirements for unloading .18
7.4.1 Personnel and supervision .18
7.4.2 Emergency stop systems (ESDs) .19
7.4.3 Unloading process conditions.19
7.4.4 Hose and connection requirements . 20
7.4.5 Prevention of over-pressurization and overfilling . 20
7.5 Prevention of back flow . 20
7.6 Bleed connections . 20
7.7 Draining of liquid from the liquefied natural gas (LNG) storage tank . 20
7.8 Liquefied natural gas (LNG) tanker .21
7.8.1 Immobility . .21
7.8.2 Turning off the engine .21
7.8.3 Equalizing the potentials .21
8 Storage .21
8.1 Liquefied natural gas (LNG) storage . .21
8.1.1 Design and construction .21
8.1.2 Safety requirements . 23
8.1.3 Installation guidance . 26
8.2 Compressed natural gas (CNG) storage .27
9 Pumps and compressors .27
9.1 General .27
9.1.1 The design requirement for safe operation .27
iii
ISO/FDIS 16924:2025(en)
9.1.2 Vibration .27
9.1.3 Connection of liquefied natural gas (LNG) pumps to the LNG storage tank .27
9.1.4 Net positive suction head (NPSH) requirements . 28
9.1.5 Vapour return . 28
9.1.6 Protection against weather . 28
9.1.7 Accessibility . 28
9.2 Liquefied natural gas (LNG) centrifugal pump (including ancillaries) . 28
9.2.1 General provisions . 28
9.2.2 Liquid inlet to the centrifugal pump . 28
9.2.3 Centrifugal pump design . 28
9.2.4 Detection of shaft seal leak . 29
9.2.5 Detection of cavitation . 29
9.3 Liquefied natural gas (LNG) reciprocating pump for LCNG fuelling stations (including
ancillaries) . 29
9.3.1 General provisions . 29
9.3.2 Liquid supplied to the reciprocating pump . 29
9.3.3 Design . 29
9.3.4 Pulsation . 29
9.4 Commonalities for liquefied natural gas (LNG) centrifugal and reciprocating pumps . . 29
9.4.1 Suction line . 29
9.4.2 Instrumentation. 30
9.4.3 Markings of a pump . 30
9.4.4 Instructions . 30
9.5 Natural gas compressor.31
10 Dispensers .31
10.1 Liquefied natural gas (LNG) dispensers .31
10.1.1 General requirements .31
10.1.2 Breakaway system . . 33
10.1.3 Fuelling hoses . 33
10.1.4 Fuelling nozzles . 34
10.1.5 Dispenser enclosure . 34
10.1.6 Other requirements . 34
10.2 Compressed natural gas (CNG) dispensers . 35
11 Vaporizers and heaters .36
11.1 Application . 36
11.2 Design of vaporizers and heaters . 36
11.3 Ambient air vaporizer .37
11.3.1 General .37
11.3.2 Defrosting .37
11.3.3 Aluminium vaporizers .37
11.4 Electric vaporizer or heater .37
11.5 Water bath vaporizer . 38
12 Odorization .38
12.1 General requirements . 38
12.2 High-pressure odorizer. 38
12.3 Safety. 38
12.4 Monitoring . 39
12.5 Odorant. 39
12.5.1 Dynamics of function . 39
13 Pipework.39
13.1 General . 39
13.2 Pipework design . 40
13.2.1 General . 40
13.2.2 Overground pipework . 40
13.2.3 Underground pipework . 40
13.2.4 Pipework in ducts .41
13.2.5 Flexible connections . . .41
iv
ISO/FDIS 16924:2025(en)
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 . .42
14.2.5 Static electricity .42
14.3 Other considerations .42
14.3.1 Interface .42
14.3.2 Primary seal .43
14.3.3 Additional seal .43
14.3.4 Conduit seals .43
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 . 44
15.5 Temperature sensors . 44
15.6 Manual emergency shutdown devices . 44
15.7 Uninterruptible power supply unit (UPS) . 44
16 Emergency shutdown .44
16.1 Application . 44
16.2 Procedure . 44
16.3 Activation .45
16.4 Emergency shut-down (ESD) action .45
16.5 Reset . 46
17 Special configurations .46
17.1 Movable liquefied natural gas (LNG) fuelling station . . 46
17.1.1 General requirements . 46
17.1.2 Anchoring . 46
17.1.3 Containment . 46
17.1.4 Configurations . 46
17.2 Mobile liquefied natural gas (LNG) fuelling station . 46
17.2.1 General requirements . 46
17.2.2 Anchoring . 46
17.2.3 Containment . 46
17.2.4 Design .47
17.2.5 Additional requirements for operation .47
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. 48
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 liquefied natural gas (LNG) storage tank and other
components . 49
19 Operations .49
19.1 Liquefied natural gas (LNG) tanker unloading . 49
19.2 Fuelling procedure . 49
19.3 Safety signs . 50
19.3.1 General on identification labels . 50
v
ISO/FDIS 16924:2025(en)
19.3.2 Equipment marking . 50
19.4 Equipment and pipework identification .51
19.5 Training .51
19.6 Installation and operating instructions .52
19.7 Emergency plan .52
19.8 Maintaining the emergency shutdown (ESD) . 53
20 Inspection and maintenance .53
20.1 Inspection . 53
20.1.1 General requirements . 53
20.1.2 Inspection and testing of electrical systems . 53
20.1.3 Inspection and re-testing of the safety relief valves . 54
20.1.4 Safety and fire protection equipment . 54
20.2 Maintenance . 55
20.2.1 Preventive maintenance planning . 55
20.2.2 Maintenance procedures. 55
20.2.3 Maintenance safety . 55
20.2.4 Draining of the liquefied natural gas (LNG) storage tank . 55
Annex A (informative) Examples of hazardous zones classification .56
Annex B (normative) Separation distances .60
Annex C (informative) Example flow diagram of a liquefied natural gas (LNG) fuelling station .64
Annex D (informative) Example flow diagram of a liquefied-to-compressed natural gas (LCNG)
fuelling station .65
Annex E (informative) Example flow diagram of a liquefied natural gas (LNG) and liquefied-to-
compressed natural gas (LCNG) fuelling station .66
Annex F (informative) Process requirements for the effective cryogenic pump operation .69
Annex G (informative) Recommendations for installation of a centrifugal pump .70
Annex H (informative) Recommendations for centrifugal pump design .72
Annex I (informative) Recommendations for installation of a reciprocating pump .73
Annex J (informative) Recommendations on the content of the cryogenic pump operation
instructions . 76
Annex K (informative) Liquefied natural gas (LNG) identification mark of an LNG fuelling
station .78
Annex L (informative) Explosion-proof static grounding control system .79
Bibliography .80
vi
ISO/FDIS 16924:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of 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 of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 340, Natural gas fuelling stations, in
collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 326,
Natural gas vehicles – Fuelling and operation, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 16924:2016), which has been technically
revised.
The main changes are as follows:
— revision of content based on operating experience and accident review, e.g. limited use of detachable
joints, use of fire-safe gaskets, use of gas detectors in critical areas;
— addition of requirements for the interface between the liquified natural gas (LNG) road tanker and LNG
fuelling station with reference to EN 17922 (LNG unloading stop system);
— addition of requirements for multi-fuel stations with reference to CEN-CENELEC GUIDE 38;
— addition of requirements to prohibit venting to the atmosphere;
— revision of Figures A.1 and A.2;
— deletion of Figure A.3;
— deletion of Annex K;
— addition of Annex L.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
vii
FINAL DRAFT International Standard ISO/FDIS 16924:2025(en)
Natural gas fuelling stations — Liquefied natural gas (LNG)
stations for fuelling road veh
...
Date: 2025-06-09
ISO/FDIS 16924:2025(en)
ISO/TC 340/WG 2
Secretariat: AFNOR
Date:
Natural gas fuelling stations — LiquifiedLiquefied natural gas
(LNG) stations for fuelling road vehicles
Stations-service de gaz naturel — Stations de gaz naturel liquéfié (GNL) de ravitaillement des véhicules
routiers
FDIS stage
ISO/FDIS 16924:2025(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel.Phone: + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
iii
ISO/DISFDIS 16924:2024(E2025(en)
Contents
Foreword . vii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 3
4 Abbreviated terms . 11
5 Risk management . 12
5.1 Risk assessment . 12
5.2 Fire protection . 14
6 General design provisions . 15
6.1 General . 15
6.2 Site layout . 17
6.3 Environmental considerations . 18
7 Fuel supply to the fuelling station . 19
7.1 Application . 19
7.2 Equipment compatibility . 19
7.3 Unloading connector . 19
7.4 Requirements for unloading . 20
7.5 Prevention of back flow . 22
7.6 Bleed connections . 22
7.7 Draining of liquid from the liquefied natural gas (LNG) storage tank . 22
7.8 Liquefied natural gas (LNG) tanker . 22
8 Storage . 23
8.1 Liquefied natural gas (LNG) storage . 23
8.2 Compressed natural gas (CNG) storage . 29
9 Pumps and compressors . 29
9.1 General . 29
9.2 Liquefied natural gas (LNG) centrifugal pump (including ancillaries) . 30
9.3 Liquefied natural gas (LNG) reciprocating pump for LCNG fuelling stations (including
ancillaries) . 31
9.4 Commonalities for liquefied natural gas (LNG) centrifugal and reciprocating pumps . 31
9.5 Natural gas compressor . 33
10 Dispensers . 33
10.1 Liquefied natural gas (LNG) dispensers . 33
10.2 Compressed natural gas (CNG) dispensers . 37
11 Vaporizers and heaters . 38
11.1 Application . 38
11.2 Design of vaporizers and heaters . 38
11.3 Ambient air vaporizer . 39
11.4 Electric vaporizer or heater . 39
11.5 Water bath vaporizer . 40
12 Odorization . 40
12.1 General requirements . 40
12.2 High-pressure odorizer . 40
12.3 Safety . 40
12.4 Monitoring . 41
12.5 Odorant . 41
iv
ISO/FDIS 16924:2025(en)
13 Pipework . 41
13.1 General . 41
13.2 Pipework design . 42
14 Electrical equipment and wiring . 43
14.1 General . 43
14.2 Main considerations . 43
14.3 Other considerations . 44
15 Instrumentation and control system . 45
15.1 General . 45
15.2 Gas detectors . 45
15.3 Flame detectors . 45
15.4 Pressure gauges . 45
15.5 Temperature sensors . 45
15.6 Manual emergency shutdown devices . 46
15.7 Uninterruptible power supply unit (UPS) . 46
16 Emergency shutdown . 46
16.1 Application . 46
16.2 Procedure . 46
16.3 Activation . 46
16.4 Emergency shut-down (ESD) action . 47
16.5 Reset . 48
17 Special configurations . 48
17.1 Movable liquefied natural gas (LNG) fuelling station . 48
17.2 Mobile liquefied natural gas (LNG) fuelling station . 48
18 Testing and commissioning . 49
18.1 Testing . 49
18.2 Commissioning . 50
19 Operations . 51
19.1 Liquefied natural gas (LNG) tanker unloading . 51
19.2 Fuelling procedure . 51
19.3 Safety signs . 51
19.4 Equipment and pipework identification . 53
19.5 Training . 53
19.6 Installation and operating instructions . 54
19.7 Emergency plan . 54
19.8 Maintaining the emergency shutdown (ESD) . 54
20 Inspection and maintenance . 55
20.1 Inspection . 55
20.2 Maintenance . 56
Annex A (informative) Examples of hazardous zones classification . 58
Annex B (normative) Separation distances . 64
Annex C (informative) Example flow diagram of a liquefied natural gas (LNG) fuelling station . 69
Annex D (informative) Example flow diagram of a liquefied-to-compressed natural gas (LCNG)
fuelling station . 71
Annex E (informative) Example flow diagram of a liquefied natural gas (LNG) and liquefied-to-
compressed natural gas (LCNG) fuelling station . 74
Annex F (informative) Process requirements for the effective cryogenic pump operation . 76
Annex G (informative) Recommendations for installation of a centrifugal pump . 77
v
ISO/DISFDIS 16924:2024(E2025(en)
Annex H (informative) Recommendations for centrifugal pump design . 81
Annex I (informative) Recommendations for installation of a reciprocating pump . 82
Annex J (informative) Recommendations on the content of the cryogenic pump operation
instructions . 87
Annex K (informative) Liquefied natural gas (LNG) identification mark of an LNG fuelling
station . 90
Annex L (informative) Explosion-proof static grounding control system . 92
Bibliography . 94
vi
ISO/FDIS 16924:2025(en)
PageForeword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of 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 of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 340, Natural gas fuelling stations, in
collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 326,
Natural gas vehicles – Fuelling and operation, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 16924:2016), which has been technically
revised.
The main changes are as follows:
— The title changed to include not abbreviated LNG and “road” vehicles to make the purpose of the
standard clear.
— Exclusions added in the 1 Scope.
— Adjustmentsrevision of content based on operating experience and accident review, e.g. limited use of
detachable joints, use of fire-safe gaskets, use of gas detectors in critical areas.;
— Additionaddition of requirements for the interface between the liquified natural gas (LNG) road tanker and
LNG fuelling station with reference to EN 17922 (LNG unloading stop system).);
— Additionaddition of requirements for multi-fuel stations with reference to CEN-CENELEC GUIDE 38.;
— Additionaddition of requirements to prohibit venting to the atmosphere. ;
revision of Figures A.1 and A.2;
deletion of Figure A.3;
vii
ISO/DISFDIS 16924:2024(E2025(en)
deletion of Annex K;
addition of Annex L— Addition of reference to ISO 21009-1 for pressure relief valve sizing.
— Addition of reference to UN ECE R110 in the definition of the limit of pressure of LNG dispensed at the
nozzle.
— Addition of reference to IEC 62443 for cybersecurity of remote monitoring.
— Update of figures of A.1 and A.2
— Deletion of Figure A.3 Example of zones classification around an LNG plant according to IEC 60079-10-
— Deletion of Annex K (informative) Example flow diagram of a high-pressure odorizer
— Addition of Annex L (informative) Explosion-proof Static Grounding Control System
.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
viii
DRAFT International Standard ISO/FDIS 16924:2025(en)
Natural gas fuelling stations — Liquefied natural gas (LNG) stations for
fuelling road vehicles
1 Scope
This document specifies requirements for the design, construction, operation, maintenance and inspection of
stations for fuelling Liquefied Natural Gasliquefied natural gas (LNG) to vehicles, including equipment, safety
and control devices. This document also specifies the design, construction, operation, maintenance and
inspection of fuelling stations using LNG as an onsite source for supplying Compressed Natural
Gascompressed natural gas (CNG) to vehicles, commonly referred to as Liquefiedliquefied-to-Compressed
Natural Gascompressed natural gas (LCNG) fuelling stations, including safety and control devices of the station
and specific LCNG fuelling station equipment.
NOTE Specific CNG equipment is dealt with in ISO 16923.
This document is applicable to fuelling stations receiving LNG and other liquefied methane-rich gases such as
Biobio LNG thatwhich comply with local applicable gas composition regulations or with the gas quality
requirements of ISO 13686.
This document covers all equipment from the LNG storage tank unloading connection up to (but not including)
the fuelling nozzle on the vehicle. The LNG storage tank unloading connection itself and the vehicle fuelling
nozzle are not covered in this document.
This document includesapplies to fuelling stations having the following characteristics:
— private access;
— public access (self-service or assisted);
— metered dispensing and non-metered dispensing;
— fuelling stations with fixed LNG storage;
— fuelling stations with mobile LNG storage;
— movable fuelling stations;
— mobile fuelling stations;
— multi-fuel stations.
This document does not apply to:
— equipment, piping, or tubing downstream of the gas pressure regulator for closed boil-off gas systems;
— liquefaction equipment.
ISO/DISFDIS 16924:2024(E2025(en)
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 4126 (all parts), Safety devices for protection against excessive pressure
ISO 9606--1, Qualification testing of welders — Fusion welding — Part 1: Steels
ISO 10380, Pipework — Corrugated metal hoses and hose assemblies
ISO 10497, Testing of valves — Fire type-testing requirements
ISO 12100, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 12617, Road vehicles — Liquefied natural gas (LNG) refuelling connector — 3,1 MPa connector
ISO 13686, Natural gas — Quality designation
ISO 13709, Centrifugal pumps for petroleum, petrochemical and natural gas industries
ISO 15609--1, Specification and qualification of welding procedures for metallic materials — Welding procedure
specification — Part 1: Arc welding
ISO 15609--2, Specification and qualification of welding procedures for metallic materials — Welding procedure
specification — Part 2: Gas welding
ISO 16923, Natural gas fuelling stations — CNG stations for fuelling vehicles
ISO 20421--1, Cryogenic vessels — Large transportable vacuum-insulated vessels — Part 1: Design, fabrication,
inspection and testing
ISO 20816-1, Mechanical vibration — Measurement and evaluation of machine vibration
ISO 21009--1, Static vacuum-insulated vessels, Part 1: Design, fabrication, inspection and tests
ISO 21011, Cryogenic vessels — Valves for cryogenic service
ISO 21012, Cryogenic vessels — Hoses
ISO 21013--3, Cryogenic vessels — Pressure-relief accessories for cryogenic service — Part 3: Sizing and capacity
determination
ISO 21029--1, Cryogenic vessels — Transportable vacuum insulated vessels of not more than 1 000 litres volume
— Part 1: Design, fabrication, inspection and tests
ISO 24490, Cryogenic vessels — Pumps for cryogenic service
ISO 31000, Risk management — Principles and guidelinesGuidelines
ISO 20607, Safety of machinery — Instruction handbook — General drafting principles
ISO 80079-36, Explosive atmospheres — Part 36: Non-electrical equipment for explosive atmospheres — Basic
method and requirements
ISO/FDIS 16924:2025(en)
IEC 31010, Risk management — Risk assessment techniques
IEC 60079-0, Explosive atmospheres — Part 0: Equipment - General requirements
IEC 60079-10-1, Explosive atmospheres — Part 10-1: Classification of areas — Explosive gas atmospheres
IEC 60079--14, Explosive atmospheres — Part 14: Electrical installations design, selection and erection
IEC 60079--17, Explosive atmospheres — Part 17: Electrical installations inspection and maintenance
IEC 60079--29-1, Explosive atmospheres - Part 29-1: Gas detectors - Performance requirements of detectors for
flammable gases
IEC 60079--29-4, Explosive atmospheres - Part 29-4: Gas detectors - Performance requirements of open path
detectors for flammable gases
IEC 60079-32-1, Explosive atmospheres - Part 32-1: Electrostatic hazards, guidance
IEC 60204--1:2005, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 61511 (all parts), Functional safety — Safety instrumented systems for the process industry sector
IEC 62305, Protection against lightning
IEC 62443-3-3, Industrial communication networks - Network and system security - Part 3-3: System security
requirements and security levels”
UN ECE R110, Uniform provisions concerning the approval of specific components of motor vehicles using CNG
in their propulsion system
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1 3.1
ambient air vaporizer
heat exchanger that vaporizes LNG with the heat of ambient air
3.2 3.2
as low as reasonably practicable
ALARP
a risk management principle applied in the regulation and control of safety-critical and safety-involved
systems, whereby residual risk is reduced to a level that is as low as reasonably practicable, taking into account
the cost, time, and effort required to further reduce the risk in relation to the benefit gained
ISO/DISFDIS 16924:2024(E2025(en)
3.3 3.3
assembly
sub-system of the fuelling station comprising several components
3.4 3.4
approved
having approval for the intended usage from an authority having jurisdiction or having the manufacturer’s
declaration for intended use
3.5
3.5 Bio
bio liquefied natural gas
bio LNG
bio methane that has been liquefied, after processing, for storage or transportation purposes
3.53.6
3.6
boiling liquid expanding vapor explosion
BLEVE
a physical explosion caused by the sudden rupture of a vessel containing a pressurized liquid at a temperature
above its atmospheric boiling point, resulting in rapid vaporization and violent energy release
Note 1 to entry: If the liquid is flammable, a BLEVE maycan also result in fireballs, thermal radiation, or secondary
explosions.
3.63.7 3.7
boil-off gas
gas produced from evaporation of Liquified Natural Gas (LNG) in the LNG storage tank and other parts of the
fuelling station including the gas returned from the vehicle tank
3.73.8 3.8
breakaway device
coupling which separates at a predetermined section to protect the fuelling station from damage by vehicles
driving away while still connected to the station
Note 1 to entry: Each separated section contains a self-closing shut-off valve which seals automatically.
3.83.9 3.9
building
structure, usually enclosed by walls and a roof, constructed to provide support or shelter for an intended
occupancy
3.93.10 3.10
bund
elevated boundary of the containment
EXAMPLE Wall, dike or embankment.
3.103.11 3.11
burst pressure
pressure that causes failure and consequential fluid loss through the component envelope
ISO/FDIS 16924:2025(en)
3.113.12
3.12
canopy
roof, overhead shelter, or hood that affords a degree of weather protection
3.13
3.13
compressed natural gas storage
CNG storage
one or more suitable pressure vessels designed for the purpose of storing compressed natural gas
3.123.14
3.14
cold end
cryogenic part of a reciprocating LNG pump
3.133.15 3.15
competent person
person having the ability, appropriate training, knowledge and experience, to supervise or carry out the work
being undertaken in a safe and proper manner
3.143.16 3.16
compressed natural gas
CNG
natural gas which has been compressed and stored for use as a vehicle fuel
[SOURCE: ISO 15500--1:20002015, 3.2]
3.153.17 3.17
compressor
machine that increases the pressure of gas
3.163.18 3.18
conduit
casing, tubing or liner, either metallic or non-metallic
[SOURCE: ISO 14310:2008, 3.6]
3.173.19 3.19
containerized fuelling station
type of movable LNG fuelling station installed on a single-container-type skid
3.183.20 3.20
containment
area, surrounded by a bund, to contain spilled LNG within that area
3.193.21 3.21
cryogenic
intended for service at temperatures down to normal boiling point of nitrogen (-196 °C).)
Note 1 to entry: Tests of the equipment with liquid nitrogen are recommended before the plant operation.
3.203.22 3.22
cryogenic pump
mechanical device that uses energy to deliver cryogenic fluid at a higher pressure
ISO/DISFDIS 16924:2024(E2025(en)
3.213.23 3.23
detachable joint
mechanical joint that can be readily disassembled
EXAMPLE Flanges, threaded joints and similar.
3.223.24 3.24
dispenser
equipment through which the fuel is supplied to the vehicle
Note 1 to entry: This equipment can include metering.
3.233.25 3.25
dry air
air with a maximum dew point of ‒40 °C
3.243.26 3.26
enclosure
structure, not being a building or canopy, that encloses a component of the fuelling station
EXAMPLE Housing, container and machine cabinet.
3.253.27 3.27
explosive gas atmosphere
mixture of substances with air, under atmospheric conditions, in the form of gases, vapours or mists in which,
after ignition has occurred, combustion spreads to the entire unburned mixture
3.263.28 3.28
extended valve
a valve with an extended spindle so that the spindle cannot freeze and be operational under all circumstances
3.273.29 3.29
fail-safe
design feature that ensures that safe conditions are maintained in the event of a malfunction of a control device
or an interruption of a supply source
3.283.30 3.30
fire resistance
property of materials or their assemblies that prevents or delays the passage of excessive heat, hot gases or
flames under specified conditions
3.293.31 3.31
fire wall
wall or separating partition erected to reduce the effects of radiated heat
3.303.32 3.32
flash gas
gas produced during the process of reducing the pressure of a saturated cryogenic liquid
3.313.33 3.33
fuelling
transfer of fuel from dispenser to the vehicle
ISO/FDIS 16924:2025(en)
3.323.34 3.34
fuelling nozzle
device which permits quick connection and disconnection of the fuelling hose to/ and from the refuelling
receptacle
3.333.35 3.35
fuelling pressure
pressure at which the fuel is delivered to the vehicle
3.343.36 3.36
fuelling station
facility at which vehicle fuels are dispensed
3.353.37 3.37
grounding
electrical connection of potentially live exposed metallic parts to earth
3.363.38 3.38
hazardous area
area in which an explosive gas atmosphere is present, or can be expected to be present, in quantities such as
to require special precautions for the construction, installation and use of apparatus to prevent ignition
[SOURCE: IEC 60079-10-1:2015, 3.3]
3.373.39 3.39
hose
pipeline of flexible material with end fittings attached
3.383.40 3.40
hose assembly
hose, or hoses, with anciliaryancillary components, such as bend restrictors, breakaways and nozzles, attached
3.393.41 3.41
interlock
system that prevents certain actions from occurring unless specific conditions are met to ensure safety and
correct sequencing
3.42
3.42
liquefied-to-compressed natural gas fuelling station
LCNG fuelling station
facility at which CNG derived from LNG is dispensed to vehicles
3.403.43 3.43
liquefied natural gas
LNG
natural gas that has been liquefied, after processing, for storage or transportation purposes
3.44
3.44
liquefied natural gas fuelling station
LNG fuelling station
facility at which LNG is unloaded, stored, filled, metered and dispensed to vehicles
Note 1 to entry: The facility is automatically controlled and safety monitored.
ISO/DISFDIS 16924:2024(E2025(en)
Note 2 to entry: The facility integrates LNG storage tanks, pumps or equivalent, dispensers, pipeline systems, vaporizers,
instrument systems, control systems, instrument air systems, and other equipment.
3.45
3.45
liquefied natural gas unloading area
LNG unloading area
area where the LNG tanker connects to the LNG fuelling station for unloading LNG into the LNG storage tank
3.46
3.46
liquefied natural gas pump
LNG pump
cryogenic pump for transferring LNG
3.47
3.47
liquefied natural gas storage tank
LNG storage tank
cryogenic vessel used for the purpose of storing LNG
3.48
3.48
liquefied natural gas tanker
LNG tanker
vehicle that delivers LNG for unloading to the LNG storage tank at the LNG fuelling station
3.49
3.49
liquefied natural gas transfer point
LNG transfer point
connection point between the hose of the LNG tanker and the fixed pipeline to the LNG storage tank
3.413.50 3.50
lower explosion limit
LEL
volume concentration of flammable gas or vapour in air, below which the mixture is not flammable
[SOURCE: ISO 19372:2015, 3.7, modified — “explosive” has been changed to “flammable”.]
3.423.51 3.51
maximum allowable working pressure
MAWP
maximum pressure to which a component or system is designed to be subjected and which is the basis for
determining the strength of the component or system
[SOURCE: ISO 12991:2012, 3.10, modified — “or system” has been added and “under consideration” has been
removed.]
3.433.52 3.52
maximum fuelling pressure
maximum pressure to which the vehicle tank can be filled
ISO/FDIS 16924:2025(en)
3.443.53 3.53
mobile LNG fuelling station
LNG fuelling station having an LNG storage tank capacity of more than 1 000 litres that can be transported
either empty or with LNG onboard
3.453.54 3.54
mobile storage
LNG storage tank assembly, having a gross volume of more than 1 000 litres, mounted on a vehicle and used
at the LNG fuelling station as a temporary LNG storage tank
3.463.55 3.55
movable LNG fuelling station
LNG (or LCNG) fuelling station (and/or LCNG fuelling station) having an LNG storage tank capacity of more
than 1 000 litres and consisting of one or more units intended for easy installation and possible relocation
3.473.56 3.56
multi-fuel station
fuelling station that can fuel natural gas as well as other fuels, for example diesel, petrol, LPG, hydrogen or
electric vehicles
3.483.57 3.57
natural gas
complex gaseous mixture of hydrocarbons, primarily methane, but generally including ethane, propane and
higher hydrocarbons, and some non-combustible gases such as nitrogen and carbon dioxide
Note 1 to entry: Natural gas can also contain components or containments such as sulphur compounds and other
chemicals.
[SOURCE: ISO 14532:2014, 2.1.1.1]
3.493.58 3.58
net positive suction head
NPSH
inlet total head increased by the head (in flowing liquid) corresponding to the atmospheric pressure at the
test location and decreased by the sum of the head corresponding to the vapour pressure of the pump liquid
at the inlet temperature and the inlet impeller height
[SOURCE: ISO 24490:2016, 3.5]
3.503.59 3.59
non-combustible
not capable of undergoing combustion under specified conditions
[SOURCE: ISO 13943:2008, 4.239]
3.513.60 3.60
normal operation
situation when the equipment is operating within its design parameters
[SOURCE: ISO 16110--1:2007, 3.50]
3.523.61 3.61
odorant
intensely smelling organic chemical or combination of chemicals added to natural gas at low concentration
and capable of imparting a characteristic and distinctive (usually disagreeable) warning odour so gas leaks
can be detected at concentrations below their lower flammability limit
ISO/DISFDIS 16924:2024(E2025(en)
Note 1 to entry: ISO/TR 16922 gives the specifications and guidelines for the methods to be used in the odorization of
natural gas under a safety point of view and specifies the principles for the odorization technique (including handling
and storage of odorants) and the control of odorization of natural gas.
[SOURCE: ISO 14532:2014, 2.8.1, modified — Note 1 to entry has been added.]
3.533.62 3.62
odorization
process of introducing odorant(s) into natural gas
3.543.63 3.63
odorizer
equipment used to introduce odorant into natural gas
3.553.64 3.64
overpressure
condition under which the pressure exceeds the maximum allowable working pressure (MAWP)
3.563.65 3.65
refuelling connector
joined assembly of LNG fuelling nozzle and LNG refuelling receptacle
3.573.66 3.66
refuelling receptacle
device connected to a vehicle or storage system, which receives the LNG fuelling nozzle and permits
safe transfer of fuel
Note 1 to entry: The receptacle consists as minimum of a receptacle body and a check valve mounted inside the body.
[SOURCE: ISO 12617:2015, 3.9]
3.583.67 3.67
separation distance
minimum separation between a hazard source and an object, which is required to mitigate the effect of a likely
foreseeable incident and prevent a minor incident from escalating into a larger incident
3.593.68 3.68
saturation pressure
pressure at which the liquid boils
Note 1 to entry: Saturation pressure is used as an expression of the thermal state of LNG. LNG of different compositions
will have a different temperature at the same saturation pressure.
3.603.69 3.69
thermal relief valve
relief valve that is installed to relieve excess pressure caused by vaporization of cryogenic liquid or warming
up of cold gas trapped in an isolated section of a pipeline or other small components of the LNG fuelling station
3.613.70 3.70
trim heater
heat exchanger that heats the gas from the vaporizer to a temperature acceptable for the downstream
equipment
Note 1 to entry: A trim heater is typically an electric heater or hot water bath.
ISO/FDIS 16924:2025(en)
3.623.71 3.71
try cock
valve connected to a pipe, the inlet of which is at the position of the maximum fill level of the tank
3.633.72 3.72
unloading
process of transferring LNG from the LNG tanker into the LNG storage tank.
3.643.73 3.73
vaporizer
heat exchanger that vaporizes LNG and delivers it in the gaseous phase
3.653.74 3.74
vehicle tank
cryogenic tank mounted on a vehicle for the storage of LNG as a fuel for that vehicle
3.663.75 3.75
ventilation
movement of air and its replacement with fresh air due to the effects of wind, temperature gradients, or
mechanical means (for example fans or extractors)
3.673.76 3.76
venting
controlled release of natural gas to the atmosphere
3.683.77 3.77
vent stack
pipe that allows gas to be vented at a safe elevation and location
3.693.78 3.78
warm end drive
non-cryogenic part of a reciprocating LNG pump, comprising the pump drive part
3.703.79 3.79
water bath vaporizer
heat exchanger that vaporizes LNG using the heat from fluid that is warmed by the ambient air or an external
source of energy including water from natural sources (e.g. river, sea)
3.713.80 3.80
zone
hazardous area classified based upon the frequency of the occurrence and duration of an explosive gas
atmosphere
[SOURCE: IEC 60079-10-1:2015, 3.3.3, modified — “gas” has been added.]
4 Abbreviated terms
ADR the agreement concerning the international carriage of dangerous goods by roadas low as
reasonably practicableboiling liquid expanding vapor explosionbasic process control system
ALARP
compressed natural gas
BLEVE
BPCS
ISO/DISFDIS 16924:2024(E2025(en)
CNG
ALARP as low as reasonably practicable
BLEVE boiling liquid expanding vapor explosion
BPCS basic process control system
CNG compressed natural gas
DGS dry gas seal
DOT
U.S. departmentDepartment of transportation, codeTransportation, Code of federal
regulationFederal Regulation (CFR) 49emergency shut-down
ESD
ESD emergency shut-down
HAZOP hazard and operability analysisinternational building code
IBC compressed natural gas, sourced from LNG
LCNG
IBC international building code
LCNG liquefied-to-compressed natural gas
LEL lower explosive limit
LNG liquefied natural gas
MAWP maximum allowable working pressure
NGV natural gas vehicle
NPSH net positive suction head
NPSH net positive suction headoperator presence control button, [formerly known as dead man’s button
(DMB)
OPCB
)]quick connect and disconnect couplingquantitative risk assessmentsafety instrumented function
QCDC
QRA
SIF
QCDC quick connect and disconnect coupling
QRA quantitative risk assessment
SIF safety instrumented function
5 Risk management
5.1 Risk assessment
5.1.1 General
Risks shall be managed throughout the life cycle of the LNG fuelling station through the adoption of a risk
management policy and framework that systematically identifies, analyses and evaluates the risks to
personnel, the environment and equipment. The principles and guidelines of ISO 12100, ISO 31000 and
IEC 31010 shall be followed in developing a risk management policy and a risk management framework. One
or more of the risk assessment techniques described in IEC 31010 shall be used to conduct risk assessments.
Appropriate risk mitigation measures can then be identified and implemented to reduce the risks to as low as
ISO/FDIS 16924:2025(en)
reasonably practicable. Risk mitigation can be achieved through various measures to reduce the probability
or the consequences, or both of a risk scenario. Risk mitigation measures can include one or more of the
following:
— the use of inherently safe designs and technologies;
— the use of protective devices and
...
PROJET FINAL
Norme
internationale
ISO/FDIS 16924
ISO/TC 340
Stations-service de gaz naturel —
Secrétariat: AFNOR
Stations de gaz naturel liquéfié
Début de vote:
(GNL) pour le ravitaillement de
2025-10-08
véhicules routiers
Vote clos le:
2025-12-03
Natural gas fuelling stations — Liquefied natural gas (LNG)
stations for fuelling road vehicles
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
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FOURNIR UNE DOCUMENTATION EXPLICATIVE.
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ISO/FDIS 16924:2025(fr) © ISO 2025
PROJET FINAL
ISO/FDIS 16924:2025(fr)
Norme
internationale
ISO/FDIS 16924
ISO/TC 340
Stations-service de gaz naturel —
Secrétariat: AFNOR
Stations de gaz naturel liquéfié
Début de vote:
(GNL) pour le ravitaillement de
2025-10-08
véhicules routiers
Vote clos le:
2025-12-03
Natural gas fuelling stations — Liquefied natural gas (LNG)
stations for fuelling road vehicles
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INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
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Publié en Suisse Numéro de référence
ISO/FDIS 16924:2025(fr) © ISO 2025
ii
ISO/FDIS 16924:2025(fr)
Sommaire Page
Avant-propos .vii
1 Domaine d'application . 1
2 Références normatives . 1
3 Termes et définitions . 3
4 Abréviations . 10
5 Gestion des risques .11
5.1 Appréciation du risque .11
5.1.1 Généralités .11
5.1.2 Protection contre une surpression .11
5.1.3 Électricité statique . 12
5.2 Sécurité incendie . 12
5.2.1 Mesures en matière de sécurité incendie . 12
5.2.2 Lutte contre l'incendie. 13
6 Dispositions générales de conception .13
6.1 Généralités . 13
6.1.1 Principe de conception . . . 13
6.1.2 Bâtiments et ouvrages de génie civil .14
6.1.3 Installation et construction . 15
6.2 Disposition du site .16
6.2.1 Distances de séparation .16
6.2.2 Gestion du trafic .16
6.2.3 Sûreté .17
6.2.4 Emplacement des équipements .17
6.3 Considérations environnementales .18
6.3.1 Atténuation du bruit .18
6.3.2 Prévention de mise à l'évent de gaz naturel .18
7 Approvisionnement en carburant de la station-service .18
7.1 Périmètre d'application .18
7.2 Compatibilité des équipements .19
7.3 Raccord de dépotage .19
7.4 Exigences relatives au dépotage .19
7.4.1 Personnel et surveillance .19
7.4.2 Systèmes d'arrêt d'urgence (AU). 20
7.4.3 Conditions du procédé de dépotage . 20
7.4.4 Exigences relatives aux flexibles et aux connexions .21
7.4.5 Prévention d'une surpression et d’un surremplissage .21
7.5 Prévention de débit à contre-courant .21
7.6 Raccords de purge .21
7.7 Vidange liquide du réservoir de stockage de gaz naturel liquéfié (GNL) . 22
7.8 Camion-citerne à gaz naturel liquéfié (GNL) . 22
7.8.1 Immobilité . 22
7.8.2 Coupure du moteur . 22
7.8.3 Mise à la terre . 22
8 Stockage .23
8.1 Stockage de gaz naturel liquéfié (GNL) . 23
8.1.1 Conception et construction . 23
8.1.2 Exigences de sécurité . 25
8.1.3 Préconisations d'installation . 28
8.2 Stockage de gaz naturel comprimé (GNC) . 29
9 Pompes et compresseurs.29
9.1 Généralités . 29
9.1.1 Exigence de conception pour un fonctionnement sûr . 29
iii
ISO/FDIS 16924:2025(fr)
9.1.2 Vibrations . 29
9.1.3 Connexion des pompes à gaz naturel liquéfié (GNL) au réservoir de stockage GNL . 29
9.1.4 Exigences relatives à la hauteur de charge nette absolue à l'aspiration (NPSH) . 30
9.1.5 Retour de vapeur . 30
9.1.6 Protection vis-à-vis des conditions climatiques . 30
9.1.7 Accessibilité . 30
9.2 Pompe centrifuge à gaz naturel liquéfié (GNL) (accessoires compris) . 30
9.2.1 Dispositions générales . 30
9.2.2 Entrée de liquide dans la pompe centrifuge . 30
9.2.3 Conception d'une pompe centrifuge . 30
9.2.4 Détection d'une fuite d'étanchéité de l'arbre .31
9.2.5 Détection d'une cavitation.31
9.3 Pompe à piston pour gaz naturel liquéfié (GNL) pour un ravitaillement en GNLC
(accessoires compris) .31
9.3.1 Dispositions générales .31
9.3.2 Entrée de liquide dans la pompe à piston .31
9.3.3 Conception .31
9.3.4 Pulsations .31
9.4 Points communs des pompes centrifuges et à piston pour gaz naturel liquéfié (GNL) .32
9.4.1 Ligne d'aspiration .32
9.4.2 Instrumentation.32
9.4.3 Marquage d'une pompe .32
9.4.4 Instructions .32
9.5 Compresseur de gaz naturel . 33
10 Bornes de distribution.33
10.1 Bornes de distribution de gaz naturel liquéfié (GNL) . 33
10.1.1 Exigences générales . 33
10.1.2 Système de désaccouplement . 35
10.1.3 Flexible de distribution . 35
10.1.4 Pistolets de distribution . 36
10.1.5 Enveloppe de la borne de distribution .37
10.1.6 Autres exigences .37
10.2 Bornes de distribution de gaz naturel comprimé (GNC) . 38
11 Vaporisateurs et modules de chauffage .38
11.1 Périmètre d'application . 38
11.2 Conception des vaporisateurs et modules de chauffage . 39
11.3 Vaporisateur à air ambiant . 39
11.3.1 Généralités . 39
11.3.2 Dégivrage . 39
11.3.3 Vaporisateurs en aluminium . 40
11.4 Vaporisateur ou module de chauffage électrique . 40
11.5 Vaporisateur par bain d'eau . 40
12 Odorisation . 41
12.1 Exigences générales .41
12.2 Odoriseur haute pression .41
12.3 Sécurité .41
12.4 Surveillance .41
12.5 Odorisant .42
12.5.1 Dynamique de la fonction . .42
13 Tuyauterie .42
13.1 Généralités .42
13.2 Conception du circuit de tuyauterie .43
13.2.1 Généralités .43
13.2.2 Circuit de tuyauterie aérien .43
13.2.3 Circuit de tuyauterie enterré . . .43
13.2.4 Tuyauteries en conduits . 44
13.2.5 Raccords flexibles . . 44
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ISO/FDIS 16924:2025(fr)
14 Équipements électriques et câblage .44
14.1 Généralités . 44
14.2 Principales considérations. 44
14.2.1 Mise à la terre . 44
14.2.2 Foudre . 44
14.2.3 Contact avec des parties sous tension . 44
14.2.4 Câbles . .45
14.2.5 Électricité statique .45
14.3 Autres considérations .45
14.3.1 Interface .45
14.3.2 Garniture d'étanchéité principale . 46
14.3.3 Garniture d'étanchéité supplémentaire . 46
14.3.4 Garnitures d'étanchéité de gaine . 46
14.3.5 Évents de détection . 46
15 Instrumentation et système de contrôle .46
15.1 Généralités . 46
15.2 Détecteurs de gaz . 46
15.3 Dispositifs de surveillance de flamme . 46
15.4 Manomètres .47
15.5 Capteurs de température .47
15.6 Dispositifs d’arrêt d’urgence .47
15.7 Unité d’alimentation électrique sans interruption (UPS) .47
16 Arrêt d'urgence . 47
16.1 Périmètre d'application .47
16.2 Procédure . 48
16.3 Activation . 48
16.4 Action d'arrêt d'urgence (AU) . 48
16.5 Réinitialisation . 49
17 Configurations particulières .49
17.1 Station-service de gaz naturel liquéfié (GNL) déplaçable . 49
17.1.1 Exigences générales . 49
17.1.2 Ancrage . 49
17.1.3 Bassin de rétention . 49
17.1.4 Configurations . 49
17.2 Station-service de gaz naturel liquéfié (GNL) mobile. 49
17.2.1 Exigences générales . 49
17.2.2 Ancrage . 50
17.2.3 Bassin de rétention . 50
17.2.4 Conception . 50
17.2.5 Exigences supplémentaires applicables à l'exploitation . 50
18 Essais et mise en service .50
18.1 Essais . 50
18.1.1 Essai électrique. 50
18.1.2 Essai de pression .51
18.1.3 Essai d'étanchéité .51
18.2 Mise en service .52
18.2.1 Dispositions générales .52
18.2.2 Purge .52
18.2.3 Essai fonctionnel .52
18.2.4 Premier dépotage du réservoir de stockage de gaz naturel liquéfié (GNL) et
d'autres composants .52
19 Exploitation .53
19.1 Dépotage du camion-citerne à gaz naturel liquéfié (GNL) . 53
19.2 Procédure de ravitaillement . 53
19.3 Panneaux de sécurité . 53
19.3.1 Généralités sur les plaques d'identification . 53
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ISO/FDIS 16924:2025(fr)
19.3.2 Marquage de l'équipement . . 54
19.4 Identification des équipements et conduites . 55
19.5 Formation . 55
19.6 Notice d'installation et d'utilisation . 55
19.7 Plan d'urgence . 56
19.8 Maintien de l'arrêt d'urgence (AU) . 56
20 Inspection et maintenance . .57
20.1 Inspection .57
20.1.1 Exigences générales .57
20.1.2 Inspection et essai des systèmes électriques .57
20.1.3 Inspection et nouvel essai des soupapes de sécurité .57
20.1.4 Équipements de sécurité et de sécurité incendie . 58
20.2 Maintenance . 58
20.2.1 Programme de maintenance préventive. 58
20.2.2 Procédures de maintenance .59
20.2.3 Sécurité lors de la maintenance .59
20.2.4 Vidange du réservoir de stockage de gaz naturel liquéfié (GNL) .59
Annexe A (informative) Exemples de classification de zones dangereuses .60
Annexe B (normative) Distances de séparation .64
Annexe C (informative) Exemple de schéma fonctionnel d'une station-service de gaz naturel
liquéfié (GNL) .68
Annexe D (informative) Exemple de schéma fonctionnel d'une station-service de gaz naturel
liquéfié-comprimé (GNLC) .69
Annexe E (informative) Exemple de schéma fonctionnel d'une station-service de gaz naturel
liquéfié (GNL) et de gaz naturel liquéfié-comprimé (GNLC) .70
Annexe F (informative) Exigences de procédé relatives à l'efficacité de fonctionnement des
pompes cryogéniques .73
Annexe G (informative) Recommandations relatives à une installation avec pompe centrifuge .75
Annexe H (informative) Recommandations relatives à la conception des pompes centrifuges .77
Annexe I (informative) Recommandations relatives à une installation avec pompe à piston .78
Annexe J (informative) Recommandations relatives au contenu des instructions de mise en
œuvre d'une pompe cryogénique . .81
Annexe K (informative) Marquage d'identification de gaz naturel liquéfié (GNL) d'une station-
service de gaz naturel liquéfié (GNL) .84
Annexe L (informative) Système de contrôle de mise à la terre statique antidéflagrant.85
Bibliographie .86
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ISO/FDIS 16924:2025(fr)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document
a été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2
(voir www.iso.org/directives).
L'ISO attire l'attention sur le fait que la mise en application du présent document peut entraîner l'utilisation
d'un ou de plusieurs brevets. L'ISO ne prend pas position quant à la preuve, à la validité et à l'applicabilité
de tout droit de propriété revendiqué à cet égard. À la date de publication du présent document, l'ISO
n'avait pas reçu notification qu'un ou plusieurs brevets pouvaient être nécessaires à sa mise en application.
Toutefois, il y a lieu d'avertir les responsables de la mise en application du présent document que des
informations plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à
l'adresse www.iso.org/brevets. L'ISO ne saurait être tenue pour responsable de ne pas avoir identifié tout ou
partie de tels droits de brevet.
Les appellations commerciales éventuellement mentionnées dans le présent document sont données pour
information, par souci de commodité, à l'intention des utilisateurs et ne sauraient constituer un engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion de
l'ISO aux principes de l'Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voir www.iso.org/avant-propos.
Le présent document a été élaboré par le comité technique ISO/TC 340, Stations de ravitaillement en gaz
naturel, en collaboration avec le comité technique CEN/TC 326, Remplissage et utilisation de véhicules au gaz
naturel, du Comité européen de normalisation (CEN), conformément à l'Accord de coopération technique
entre l'ISO et le CEN (Accord de Vienne).
Cette deuxième édition annule et remplace la première édition (ISO 16924:2016), qui a fait l'objet d'une
révision technique.
Les principales modifications sont les suivantes:
— révision du contenu sur la base de l'expérience de fonctionnement et du passage en revue des accidents,
par exemple utilisation limitée de raccords détachables, utilisation de joints anti-incendie, utilisation de
détecteurs de gaz dans les zones critiques;
— ajout d'exigences relatives à l'interface entre le camion-citerne à gaz naturel liquéfié (GNL) et la station-
service GNL en référence à l'EN 17922 (système d'arrêt de déchargement de GNL);
— ajout d'exigences pour les stations-service multi-carburants avec référence au GUIDE 38 du CEN-
CENELEC;
— ajout d'exigences pour interdire le dégazage à l'atmosphère;
— révision des Figures A.1 et A.2;
— suppression de la Figure A.3;
— suppression de l'Annexe K;
— ajout de l'Annexe L.
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ISO/FDIS 16924:2025(fr)
Il convient que l'utilisateur adresse tout retour d'information ou toute question concernant le présent
document à l'organisme national de normalisation de son pays. Une liste exhaustive desdits organismes se
trouve à l'adresse www.iso.org/fr/members.html.
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