ISO 16923
(Main)Natural gas fuelling stations — Compressed natural gas (CNG) stations for fuelling vehicles
Natural gas fuelling stations — Compressed natural gas (CNG) stations for fuelling vehicles
ISO 16923:2016 covers the design, construction, operation, inspection and maintenance of stations for fuelling compressed natural gas (CNG) to vehicles, including equipment, safety and control devices. ISO 16923:2016 also applies to portions of a fuelling station where natural gas is in a gaseous state and dispensing CNG derived from liquefied natural gas (LCNG) according to ISO 16924. ISO 16923:2016 applies to fuelling stations supplied with natural gas as defined in local applicable 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). ISO 16923:2016 includes all equipment for downstream gas supply connection (i.e. point of separation between the CNG fuelling station piping and the pipeline network). Fuelling station nozzles are not defined in this document. ISO 16923:2016 covers fuelling stations with the following characteristics: - slow fill; - fast fill; - private access; - public access (self-service or assisted); - fuelling stations with fixed storage; - fuelling stations with mobile storage (daughter station); - multi-fuel stations. ISO 16923:2016 is not applicable to domestic CNG fuelling devices without buffer storage. NOTE ISO 16923:2016 is based on the condition that the gas entering the fuelling station is odorized. For unodorized gas fuelling stations, additional safety requirements are included in Clause 10.
Stations-service de gaz naturel — Stations de gaz naturel comprimé (GNC) pour le ravitaillement de véhicules
L'ISO 16923:2016 traite de la conception, la construction, l'exploitation, l'inspection et la maintenance des stations de ravitaillement au gaz naturel comprimé (GNC) pour véhicules, dont les appareils et les dispositifs de sécurité et de contrôle. L'ISO 16923:2016 s'applique également aux parties d'une station-service où le gaz naturel se trouve à l'état gazeux et où le GNC dérivé d'un gaz naturel liquéfié (GNCL) est distribué conformément à l'ISO 16924. L'ISO 16923:2016 s'applique aux stations-service alimentées par gaz naturel tel que défini par les règlements locaux applicables relatifs à la composition des gaz ou par l'ISO 13686. Elle s'applique également à d'autres gaz satisfaisant à ces exigences tels que le biométhane, le méthane de houille (MH) valorisé et les gaz provenant de la vaporisation de GNL (sur ou hors site). L'ISO 16923:2016 couvre tous les appareils en aval de la connexion d'alimentation en gaz (c'est-à-dire le point de séparation entre les conduites de la station-service GNC et le réseau de canalisations). Les pistolets de distribution des stations-service ne sont pas définis dans ce document. L'ISO 16923:2016 comprend les stations-service avec les caractéristiques suivantes: - remplissage lent; - remplissage rapide; - accès privé; - accès public (self-service ou avec assistance); - stations-service avec stockage fixe; - stations-service avec stockage mobile (station secondaire); - stations multi-carburants. L'ISO 16923:2016 ne s'applique pas aux dispositifs domestiques de ravitaillement de GNC sans stockage tampon. NOTE L'ISO 16923:2016 repose sur la condition que les gaz fournis à la station-service sont odorisés. Pour les stations-service utilisant des gaz non odorisés, des exigences de sécurité supplémentaires sont spécifiées à l'Article 10.
General Information
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Standards Content (Sample)
FINAL DRAFT
International
Standard
ISO/FDIS 16923
ISO/TC 340
Natural gas fuelling stations —
Secretariat: AFNOR
Compressed natural gas (CNG)
Voting begins on:
stations for fuelling vehicles
2025-10-08
Voting terminates on:
2025-12-03
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
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Reference number
ISO/FDIS 16923:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 16923:2025(en)
International
Standard
ISO/FDIS 16923
ISO/TC 340
Natural gas fuelling stations —
Secretariat: AFNOR
Compressed natural gas (CNG)
Voting begins on:
stations for fuelling 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
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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
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ISO/FDIS 16923:2025(en) © ISO 2025
ii
ISO/FDIS 16923:2025(en)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 3
4 Symbols and abbreviated terms. 9
4.1 Symbols .9
4.2 Abbreviated terms .9
5 Risk management . 9
5.1 General .9
5.2 Hazardous area classification .10
5.3 Design and safety requirements for station layout and operation .11
5.4 Site layout . 12
5.5 Pressure safety relief valves and venting . 12
6 Fuel supply to the fuelling station .13
6.1 Supply by pipeline . 13
6.2 Supply by mobile storage . 13
7 Dryer . 14
8 Compressors .15
8.1 General . 15
8.2 Instrumentation and control . 15
8.3 Compressor design.16
8.3.1 General .16
8.4 Compressor enclosures, buildings and canopies .16
8.5 Underground compressor installations .17
8.6 Hazardous area classification .17
9 Buffer storage .18
9.1 General .18
10 Dispensers .18
10.1 General requirements .18
10.2 Breakaway devices .19
10.3 Fuelling hose assemblies .19
10.4 Fuelling hoses . 20
10.5 Dispenser enclosure .21
10.6 Fuelling controls and instrumentation . 22
10.7 Electrical systems and interconnections . 23
11 Gas odorization.23
12 Pipework.24
12.1 General .24
12.2 Buried piping .24
13 Electrical .25
13.1 Labelling . 25
13.2 Contact with live parts . 25
13.3 Cables . 25
13.4 Performance after power fail and restoration . 25
13.5 Electrical and grounding . 26
14 Instrumentation and control system .26
14.1 General . 26
14.2 Gas detection . 26
14.3 Uninterruptible power supply unit (UPS) .27
iii
ISO/FDIS 16923:2025(en)
15 Emergency shutdown .27
15.1 Emergency shutdown devices (ESDs) .27
15.2 Emergency shutdown procedure .27
15.3 Restoration after emergency shutdown . 28
16 Indoor fuelling .28
16.1 General . 28
16.2 Ventilation . 28
16.3 Additional requirements . 29
17 Testing and commissioning .29
18 Operation .29
18.1 Fuelling procedures . 29
18.2 Safety signs . 30
18.3 Training . 30
18.4 Emergency response plan . .31
18.5 Explosion protection measures .31
18.6 Operations manual .31
18.7 Documentation .31
18.7.1 Traceability .31
18.7.2 Handover documents .31
19 Installation and operating instructions .32
20 Inspection and maintenance .32
20.1 Inspection and maintenance program .32
20.2 Maintenance and testing frequency of gas detection .32
20.3 Maintenance operations . . 33
20.3.1 General . 33
20.4 instrument loops . 33
Annex A (informative) Examples of hazardous zone classification .34
Annex B (normative) Separation distances . 41
Annex C (informative) Fuelling procedures .42
Annex D (informative) Emergency instructions example .43
Annex E (informative) Example of fuelling station periodic inspection and maintenance .44
Bibliography .46
iv
ISO/FDIS 16923:2025(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 16923:2016), which has been technically
revised.
The main changes are as follows:
— clarification and expansion of the scope to explicitly exclude vehicle-to-vehicle transfer and vehicle
refuelling appliances (VRAs);
— revision of Clause 2;
— revision of Clause 3, with the inclusion of new entries;
— revision of the risk management clause to incorporate a lifecycle approach, with enhanced provisions for
ignition prevention, explosion mitigation, and equipment protection;
— revision of the design and safety provisions to strengthen them, including requirements for physical
protection of exposed gas equipment, electrical system reliability, and enhanced venting and shutdown
protocols;
— revision of Annex A (hazardous zone classification) to clarify designer responsibilities in determining
hazardous areas;
— revision of annexes to reflect current operational practices, with revised examples for fuelling procedures,
emergency instructions, and maintenance programs.
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.
v
FINAL DRAFT International Standard ISO/FDIS 16923:2025(en)
Natural gas fuelling stations — Compressed natural gas (CNG)
stations for fuelling vehicles
1 Scope
This document specifies requirements for the design, construction, operation, maintenance and inspection
of stations for fuelling compressed natural gas (CNG) to vehicles, including equipment, safety and control
devices up to the fuelling nozzle to the vehicle.
This document applies to fuelling stations supplied with natural gas as defined in local applicable gas
composition regulations or ISO 13686. It also applies to other gases meeting these requirements.
This document also applies to portions of a fuelling station where natural gas is in a gaseous state and
dispensing CNG derived from liquefied natural gas (LCNG) according to ISO 16924.
This document covers all equipment for downstream gas supply connection (i.e. point of separation between
the CNG fuelling station piping and the pipeline network). Fuelling station nozzle are not defined in this
document.
This document covers fuelling stations with the following characteristics:
— slow fill;
— fast fill;
— private access;
— public access (self-service or assisted);
— fuelling stations with fixed storage;
— fuelling stations with mobile storage (daughter station);
— multi-fuel stations.
This document is not applicable to vehicle to vehicle transfer or vehicle refuelling appliances (VRA).
NOTE This document is based on the condition that the gas entering the fuelling station is odorized. For
unodorized gas fuelling stations, additional safety requirements are included in Clause 10.
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 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 30013, Rubber and plastics hoses — Methods of exposure to laboratory light sources — Determination of
changes in colour, appearance and other physical properties
ISO 9809-1, Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and tubes
— Part 1: Quenched and tempered steel cylinders and tubes with tensile strength less than 1 100 MPa
ISO/FDIS 16923:2025(en)
ISO 9809-2, Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and
tubes — Part 2: Quenched and tempered steel cylinders and tubes with tensile strength greater than or equal to
1 100 MPa
ISO 11119-1, Gas cylinders — Design, construction and testing of refillable composite gas cylinders and tubes —
Part 1: Hoop wrapped fibre reinforced composite gas cylinders and tubes up to 450 l
ISO 11119-2, Gas cylinders — Design, construction and testing of refillable composite gas cylinders and tubes —
Part 2: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450 l with load-sharing metal liners
ISO 11119-3, Gas cylinders — Design, construction and testing of refillable composite gas cylinders and tubes
— Part 3: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450 l with non-load-sharing
metallic or non-metallic liners or without liners
ISO 11439, Gas cylinders — High pressure cylinders for the on-board storage of natural gas as a fuel for
automotive vehicles
ISO 11925-3, Reaction to fire tests — Ignitability of building products subjected to direct impingement of flame
— Part 3: Multi-source test
ISO 12100, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13847, Petroleum and natural gas industries — Pipeline transportation systems — Welding of pipelines
ISO 14120, Safety of machinery — Guards — General requirements for the design and construction of fixed and
movable guards
ISO 15500-2, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2: Performance
and general test methods
ISO 15500-17, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 17: Flexible fuel line
ISO 15589-1, Petroleum, petrochemical and natural gas industries — Cathodic protection of pipeline systems —
Part 1: On-land pipelines
ISO 15649, Petroleum and natural gas industries — Piping
ISO 23684, Road vehicles — Technical personnel dealing with natural gas vehicles (NGVs) — Training and
qualification
ISO 20607, Safety of machinery — Instruction handbook — General drafting principles
ISO 20816-8, Mechanical vibration — Measurement and evaluation of machine vibration — Part 8: Reciprocating
compressor systems
ISO 24671, Road vehicles — Qualification and certification of technical personnel dealing with natural gas
vehicles (NGVs)
IEC 31010, Risk management — Risk assessment techniques
IEC 60079-0, Electrical apparatus for explosive gas atmospheres — Part 0: General requirements
IEC 60079-7, Explosive atmospheres - Part 7: Equipment protection by increased safety “e”
IEC 60079-10-1, Explosive atmospheres — Part 10-1: Classification of areas — Explosive gas atmospheres
IEC 60079-11, Explosive atmospheres — Part 11: Equipment Protection by Intrinsic Safety “i”
IEC 60079-14, Electrical apparatus for explosive gas atmospheres — Part 14: Electrical installations in
hazardous areas (other than mines)
IEC 60079-25, Explosive atmospheres — Part 25: Intrinsically safe electrical systems
ISO/FDIS 16923:2025(en)
IEC 60079-29-1, Explosive atmospheres - Part 29-1: Gas detectors - Performance requirements of detectors for
fammable gases
IEC 60079-29-4, Explosive atmospheres - Part 29-4: Gas detectors - Performance requirements of open path
detectors for fammable gases
IEC 60204-1, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 61508-1, Functional safety of electrical/electronic/programmable electronic safety related systems – Part 1:
General requirements
IEC 61508-2, Functional safety of electrical/electronic/programmable electronic safety related systems – Part 2:
Requirements for electrical/electronic/programmable electronic safety related systems
IEC 61508-3, Functional safety of electrical/electronic/programmable electronic safety related systems – Part
3: Software requirements
IEC 61511-1:2016+AMD1:2017, Functional safety – Safety instrumented systems for the process industry sector
– Part 1: Framework, definitions, system, hardware and application programming requirements
IEC 62443-2, Industrial communication networks – network and system security - Part 2: Policies and Procedures
IEC 62443-3, Industrial communication networks – network and system security – Part 3: System Level
IEC 62443-4, Industrial communication networks – network and system security – Part 4: Component Level
ISO 2615:2024, Analysis of natural gas —Biomethane — Determination of the content of compressor oil
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
assembly
sub-system of fuelling stations comprising several components
3.2
auto-extinguishing
feature of a material that ceases combustion upon removal of flame or ignition source
3.3
biomethane
methane rich gas derived from biogas or from gasification of biomass by upgrading with the properties
similar to natural gas
[SOURCE: ISO 14532:2014, 2.1.1.15]
3.4
bonding
equipotential zone where potentially live exposed metallic parts are electrically connected with at least one
point connected to the ground or earth
ISO/FDIS 16923:2025(en)
3.5
breakaway device
coupling that separates at a predetermined section to protect the fuelling station from damage by vehicles
driving away while still connected to the station
3.6
buffer storage
one or more suitable pressure vessels designed for the purpose of storing compressed natural gas
3.7
building
structure, usually enclosed by walls and a roof, constructed to provide support or shelter for an intended
occupancy
3.8
bundled tube
bundles of small diameter stainless steel tubes contained within a polyethylene sheath
3.9
burst pressure
p
b
pressure that causes failure and consequential fluid loss through the component envelope
3.10
canopy
roof, overhead shelter, or hood, that affords a degree of weather protection
3.11
compresses natural gas fuelling station
CNG fuelling station
facility at which compressed natural gas is dispensed to vehicles
3.12
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 with documented proof of appropriate training
3.13
compressed natural gas
CNG
natural gas which has been compressed and stored for use as a vehicle fuel
[SOURCE: ISO 15500-1:2000, 3.2]
3.14
compressor
equipment that increases the pressure of gas
3.15
conduit
casing, tubing or liner, either metallic or non-metallic
[SOURCE: ISO 14310:2008, 3.6]
3.16
cylinder
pressure vessel used for the storage of compressed natural gas
3.17
cylinder working pressure
settled pressure of a fully filled cylinder at a uniform temperature of 15 °C
ISO/FDIS 16923:2025(en)
3.18
dispenser
equipment through which the fuel is supplied to the vehicle
Note 1 to entry: This equipment can include metering.
3.19
dryer
item of equipment that decreases the water vapour content (moisture) of natural gas
3.20
enclosure
structure, not being a building or canopy, that encloses a component of the fuelling station
EXAMPLE Housing, container and machine cabinet.
3.21
explosive gas atmosphere
mixture of substances with air, under atmospheric conditions, in the form of gases, vapours, mists or dusts
in which, after ignition has occurred, combustion spreads to the entire unburned mixture
[SOURCE: IEC 61340-4-4:2014, 11, 3.4]
3.22
fail-safe
design feature that ensures a system or component enters or maintains a safe condition in the event of a
malfunction or loss of power supply
Note 1 to entry: A fail-safe function may involve shutdown, isolation, or deactivation of equipment to prevent hazards.
3.23
fast fill
fuelling operation which has a designed flow rate greater than 100 m (N)/h per nozzle
3.24
field piping
piping installed for interconnection between equipment at the site
3.25
fire resistant
property that prevents or retards the passage of excessive heat, hot gases or flames under specified
conditions
3.26
fire wall
wall, or separating partition erected to reduce the effects of radiated heat
3.27
fuelling
transfer of fuel from dispenser to the vehicle
3.28
fuelling pressure
pressure at which the fuel is delivered to the vehicle
3.29
fuelling station
facility at which vehicles fuels are dispensed
3.30
grounding
electrical connection of potentially live exposed metallic parts to earth
ISO/FDIS 16923:2025(en)
3.31
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 60079-10-1:2008, 3.3]
3.32
hose
pipeline of flexible material with end fittings attached
3.32.1
vent hose
pipeline of flexible material through which natural gas is vented from the fuelling connection at a vehicle
3.31.2
hose assembly
hose or hoses with ancillary components, such as bend restrictors, breakaways and nozzles, attached
3.33
intrinsically safe circuit
circuit in which any spark or thermal effect is incapable of causing ignition of a mixture of flammable or
combustible material in air under specified test conditions
3.34
lower explosive 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”.]
3.35
maximum allowable operating pressure
MAOP
maximum pressure that the component or system is subjected to during normal operation
Note 1 to entry: MAOP is typically not greater than 90 % of the maximum allowable working pressure of the component
or system.
3.36
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.]
3.36.1
mobile storage
multi-cylinder or tank fixture mounted on a vehicle or trailer and used for the transportation of natural gas
to CNG fuelling stations
3.37
multi-fuel dispenser
dispenser delivering CNG and other fuels (liquid or gaseous)
3.38
multi-fuel station
fuelling station that can fuel natural gas as well as other fuels, for example diesel, petrol, LPG
ISO/FDIS 16923:2025(en)
3.39
natural gas
complex gaseous mixture of hydrocarbons, primarily methane, but generally includes 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 sulfur compounds and/or other
chemical species.
[SOURCE: ISO 14532:2014, 2.1.1.1]
3.40
non-combustible
not capable of undergoing combustion under specified conditions
[SOURCE: ISO 13943:2008, 4.239]
3.41
normal operation
situation when the equipment is operating within its design parameters
[SOURCE: ISO 16110-1:2007, 3.50]
3.42
normally occupied building
building where people are regularly present for extended durations e.g. home or workplace
3.43
non-hazardous area
area in which an explosive gas is not expected to be present in quantities such as to require special
precautions for the construction, installation and use of apparatus
[SOURCE: ISO 16110-1:2007, 3.48]
3.44
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
Note 1 to entry: ISO/TR 16922 provides guidelines for methods 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.]
3.45
odorization
process of introducing odorant(s) into natural gas
3.46
overpressure
condition under which the pressure exceeds the maximum allowable working pressure
3.47
piping
system for conveying fluids including pipes, valves, strainers and fittings
[SOURCE: ISO 16818:2008, 3.170]
3.48
power failure
power loss such that any electrical component or sub system stop working (such as flow control) are
operating outside manufacturers specification
ISO/FDIS 16923:2025(en)
3.49
refuelling receptacle
device connected to a vehicle or storage system which receives the CNG refuelling nozzle and permits
safe transfer of fuel
3.50
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 escalating into a larger incident
3.51.1
external separation distance
separation distance between a hazard source and an object situated outside the boundaries of the fuelling station
3.51.2
internal separation distance
separation distance between a hazard source and an object situated within the boundaries of the fuelling station
3.52
settled pressure
gas pressure when a given settled temperature is reached and there is no gas flow
3.53
settled temperature
uniform gas temperature in the cylinder after the dissipation of any heat caused by fuelling
3.54
self-service
facility where the fuel is dispensed by the user with or without supervision by an attendant
3.55
slow fill
refuelling method where multiple vehicles are connected to a common gas supply manifold and filled
gradually over a predefined time period
Note 1 to entry: Typically used in fleet environments, this method allows unattended overnight fuelling and can take
several hours.
3.56
tubing
network of pipes, fittings and valves used to transfer natural gas between items of equipment
Note 1 to entry: Any pipe with an outside diameter less than 25,4 mm (1 in) is classified as "tubing for the purposes of
this document.
3.57
vault
room or space, typically situated underground
3.58
ventilation
movement of air and its replacement with fresh air due to the effects of wind, temperature gradients, or
artificial means
Note 1 to entry: Artificial means can include, for example, fans or extractors.
3.59
venting
controlled release of natural gas to the atmosphere
ISO/FDIS 16923:2025(en)
3.60
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 Symbols and abbreviated terms
4.1 Symbols
p
burst pressure
b
p
maximum allowable working pressure
MAWP
4.2 Abbreviated terms
CNG compressed natural gas
IS intrinsically safe
ERP emergency response plan
LEL lower explosive limit
MAOP maximum allowable operating pressure
MAWP maximum allowable working pressure
NGV natural gas vehicle
P&I process and instruments
5 Risk management
5.1 General
5.1.1 Risks shall be managed throughout the life cycle of the CNG 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 reasonably practicable. Risk mitigation can be achieved through various measures to reduce either the
probability or the consequences of a risk scenario.
NOTE Risk mitigation measures may include one or more of the following:
a) the use of inherently safe designs and technologies;
b) the use of protective devices and systems;
c) the adoption of specific operating and maintenance procedures;
d) the use of personal protective equipment;
e) the provision of information and training;
f) the adoption of emergency planning and emergency procedures during the delivery process;
ISO/FDIS 16923:2025(en)
g) the need for an emergency stop system that, once activated, stops the filling process and interacts with valves on
the tube trailer or transportable module, as applicable;
h) the prevention of public access during the delivery process;
i) the isolation of valves at the filling points;
j) the adoption of measures to prevent gas storage beyond permitted design limits for volume and pressure;
k) the design of connection points to ensure a connection/disconnection suitable for transport storage and site
storage;
l) the identification of losses during the delivery process;
m) the protection against breakage of the flexible hose during transfer;
n) the identification of hazardous areas around the delivery area;
o) the flow control if applicable.
5.1.2 Risk assessment shall follow the techniques described in ISO 12100 for assessment of machinery
safety and IEC 31010 for general site risk management, or local applicable standards.
5.1.3 The CNG fuelling station installation shall be sited to minimize risk to users, operating personnel,
properties, and environment.
5.1.4 Risk assessment shall include design, construction, operation and maintenance of the CNG fuelling
station. The risk assessment process shall be used to evaluate the consequences of hazardous events and to
determine appropriate means of either risk reduction or mitigation of consequences, or both.
5.1.5 Measures to reduce fire and explosion risks shall be applied, including but not limited to:
— prevention of the formation of a flammable or explosive mixture;
— avoidance of electrostatic risk;
— avoidance of ignition sources;
— mitigation of the effects of a fire or explosion.
5.1.6 Protection against static electricity shall be carried out in accordance with IEC 60079-32-1 and
ISO 80079-36 or equivalent st
...
Date: 2025-07-28
ISO/FDIS 16923:2025(en)
ISO/TC 340/WG 1
Secretariat: AFNOR
Date:
Natural gas fuelling stations — Compressed Natural Gasnatural gas
(CNG) stations for fuelling vehicles
Stations-service de gaz naturel — Stations GNC pour le ravitaillement de véhicules
FDIS stage
ISO/FDIS 16923:2025(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'sISO’s member body in the country of the requester.
ISO Copyright Office copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland.
ii
ISO/FDIS 16923:2025(en)
Contents Page
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 4
4 Symbols and abbreviated terms . 10
4.1 Symbols . 10
4.2 Abbreviated terms . 10
5 Risk management . 10
5.1 General . 10
5.2 Hazardous area classification . 12
5.3 Design and safety requirements for station layout and operation . 12
5.4 Site layout . 13
5.5 Pressure safety relief valves and venting . 13
6 Fuel supply to the fuelling station . 14
6.1 Supply by pipeline . 14
6.2 Supply by mobile storage . 14
7 Dryer . 15
8 Compressors . 16
8.1 General . 16
8.2 Instrumentation and control . 16
8.3 Compressor design . 17
8.4 Compressor enclosures, buildings and canopies . 17
8.5 Underground compressor installations . 18
8.6 Hazardous area classification . 18
9 Buffer storage . 18
9.1 General . 18
10 Dispensers . 19
10.1 General requirements . 19
10.2 Breakaway devices . 19
10.3 Fuelling hose assemblies . 20
10.4 Fuelling hoses . 21
10.5 Dispenser enclosure . 21
10.6 Fuelling controls and instrumentation . 22
10.7 Electrical systems and interconnections . 24
11 Gas odorization . 24
12 Pipework . 25
12.1 General . 25
12.2 Buried piping . 25
13 Electrical . 26
13.1 Labelling . 26
13.2 Contact with live parts . 26
13.3 Cables . 26
13.4 Performance after power fail and restoration . 26
13.5 Electrical and grounding . 26
14 Instrumentation and control system . 27
iii
ISO/FDIS 16923:2025(en)
14.1 General . 27
14.2 Gas detection . 27
14.3 Uninterruptible power supply unit (UPS). 27
15 Emergency shutdown . 28
15.1 Emergency shutdown devices (ESDs) . 28
15.2 Emergency shutdown procedure . 28
15.3 Restoration after emergency shutdown . 29
16 Indoor fuelling . 29
16.1 General . 29
16.2 Ventilation . 29
16.3 Additional requirements . 29
17 Testing and commissioning . 30
18 Operation . 30
18.1 Fuelling procedures . 30
18.2 Safety signs . 30
18.3 Training . 31
18.4 Emergency response plan . 32
18.5 Explosion protection measures . 32
18.6 Operations manual . 32
18.7 Documentation . 32
19 Installation and operating instructions . 32
20 Inspection and maintenance. 33
20.1 Inspection and maintenance program . 33
20.2 Maintenance and testing frequency of gas detection . 33
20.3 Maintenance operations . 34
20.4 instrument loops . 34
Annex A (informative) Examples of hazardous zone classification . 35
Annex B (normative) Separation distances . 46
Annex C (informative) Fuelling procedures . 47
Annex D (informative) Emergency instructions example . 48
Annex E (informative) Example of fuelling station periodic inspection and maintenance . 49
Bibliography . 52
iv
ISO/FDIS 16923:2025(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 16923:2016), which has been technically
revised.
The main changes are as follows:
— clarification and expansion of the scope to explicitly exclude vehicle-to-vehicle transfer and vehicle
refuelling appliances (VRAs);
— revision of Clause 2;
— revision of Clause 3The, with the inclusion of new entries;
— revision of the risk management clause has been significantly expanded to incorporate a lifecycle
approach, referencing IEC 31010 and ISO 12100, with enhanced provisions for ignition prevention,
explosion mitigation, and equipment protection.;
• The scope has been clarified and extended to explicitly exclude vehicle-to-vehicle transfer and vehicle
refuelling appliances (VRAs), while reaffirming its applicability to both public and private CNG
stations, including fast-fill and time-fill operations.
• Definitions have been updated and extended in Clause 3, including new entries such as piping, tubing,
time fill, and fail-safe, and harmonized with ISO 16924 and ISO 15500 terminology.
v
ISO/FDIS 16923:2025(en)
• The normative references list has been revised to remove obsolete documents and incorporate
updated standards, such as replacing ISO 8580 with ISO 30013 and adding ISO 2615 for biomethane
quality analysis.
— Therevision of the design and safety provisions have been strengthenedto strengthen them, including
requirements for physical protection of exposed gas equipment, electrical system reliability, and enhanced
venting and shutdown protocols.;
— Annex Arevision of Annex A (hazardous zone classification) has been retained as informative, with
improved formatting and clarification onto clarify designer responsibilities in determining hazardous
areas.;
— Annexes have been updatedrevision of annexes to reflect current operational practices, with revised
examples for fuelling procedures, emergency instructions, and maintenance programs.
• The structure of the document has been refined to improve consistency, remove editorial ambiguity,
and distinguish clearly between normative requirements and informative guidance.
This revision reflects a more detailed and risk-based approach to the design, construction, operation, and
maintenance of CNG fuelling stations, addressing developments in technology and aligning more closely with
international best practices.
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.
vi
Final DRAFT International Standard ISO/FDIS 16923:2025(en)
Natural gas fuelling stations — — Compressed natural gas (CNG)
stations for fuelling vehicles
1 Scope
This document coversspecifies requirements for the design, construction, operation, maintenance and
inspection of stations for fuelling compressed natural gas (CNG) to vehicles, including equipment, safety and
control devices up to the fuelling nozzle to the vehicle.
This document applies to fuelling stations supplied with natural gas as defined in local applicable gas
composition regulations or ISO 13686. It also applies to other gases meeting these requirements.
This document also applies to portions of a fuelling station where natural gas is in a gaseous state and
dispensing CNG derived from liquefied natural gas (LCNG) according to ISO 16924.
This document covers all equipment for downstream gas supply connection (i.e. point of separation between
the CNG fuelling station piping and the pipeline network). Fuelling station nozzle are not defined in this
document.
This document covers fuelling stations with the following characteristics:
— — slow fill;
— — fast fill;
— — private access;
— — public access (self-service or assisted);
— — fuelling stations with fixed storage;
— — fuelling stations with mobile storage (daughter station);
— — multi-fuel stations.
This document is not applicable to vehicle to vehicle transfer, Vehicle or vehicle refuelling appliances (VRA).
NOTE This document is based on the condition that the gas entering the fuelling station is odorized. For unodorized
gas fuelling stations, additional safety requirements are included in Clause 10Clause 10.
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 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/FDIS 16923:2025(en)
ISO 30013, Rubber and plastics hoses — Methods of exposure to laboratory light sources — Determination of
changes in colour, appearance and other physical properties
ISO 9809--1, Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and tubes
— Part 1: Quenched and tempered steel cylinders and tubes with tensile strength less than 1 100 MPa
ISO 9809--2, Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and tubes
— Part 2: Quenched and tempered steel cylinders and tubes with tensile strength greater than or equal to
1 100 MPa
ISO 11119--1, Gas cylinders — Design, construction and testing of refillable composite gas cylinders and tubes
— Part 1: Hoop wrapped fibre reinforced composite gas cylinders and tubes up to 450 l
ISO 11119--2, Gas cylinders — Design, construction and testing of refillable composite gas cylinders and tubes
— Part 2: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450 l with load-sharing metal
liners
ISO 11119--3, Gas cylinders — Design, construction and testing of refillable composite gas cylinders and tubes
— Part 3: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450 l with non-load-sharing
metallic or non-metallic liners or without liners
ISO 11439, Gas cylinders — High pressure cylinders for the on-board storage of natural gas as a fuel for
automotive vehicles
ISO 11925--3, Reaction to fire tests — Ignitability of building products subjected to direct impingement of flame
— Part 3: Multi-source test
ISO 12100, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13847, Petroleum and natural gas industries — Pipeline transportation systems — Welding of pipelines
ISO 14120, Safety of machinery — Guards — General requirements for the design and construction of fixed and
movable guards
ISO 15500--2, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2: Performance
and general test methods
ISO 15500--17, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 17: Flexible fuel
line
ISO 15589--1, Petroleum, petrochemical and natural gas industries — Cathodic protection of pipeline systems
— Part 1: On-land pipelines
ISO 15649, Petroleum and natural gas industries — Piping
ISO 23684, Road vehicles — Technical personnel dealing with natural gas vehicles (NGVs) — Training and
qualification
ISO 20607, Safety of machinery — Instruction handbook — General drafting principles
ISO 20816-8, Mechanical vibration — Measurement and evaluation of machine vibration — Part 8:
Reciprocating compressor systems
ISO 24671, Road vehicles — Qualification and certification of technical personnel dealing with natural gas
vehicles (NGVs)
ISO/FDIS 16923:2025(en)
IEC 31010, Risk management — Risk assessment techniques
IEC 60079--0, Electrical apparatus for explosive gas atmospheres — Part 0: General requirements
IEC 60079-IEC 60079-7, Explosive atmospheres - Part 7: Equipment protection by increased safety “e”
IEC 60079-10-1, Explosive atmospheres — Part 10-1: Classification of areas — Explosive gas atmospheres
IEC 60079--11, Explosive atmospheres — Part 11: Equipment Protection by Intrinsic Safety “i”
IEC 60079--14, Electrical apparatus for explosive gas atmospheres — Part 14: Electrical installations in
hazardous areas (other than mines)
IEC 60079--25, Explosive atmospheres — Part 25: Intrinsically safe electrical systems
IEC 60079--29-1, Explosive atmospheres - Part 29-1: Gas detectors - Performance requirements of detectors for
fammable gases
IEC 60079--29-4, Explosive atmospheres - Part 29-4: Gas detectors - Performance requirements of open path
detectors for fammable gases
IEC 60204--1, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 61508-1:2010 –, Functional safety of electrical/electronic/programmable electronic safety related systems
– Part 1: General requirements
IEC 61508-2:2010 –, Functional safety of electrical/electronic/programmable electronic safety related systems
– Part 2: Requirements for electrical/electronic/programmable electronic safety related systems
IEC 61508-3:1998 –, Functional safety of electrical/electronic/programmable electronic safety related systems
– Part 3: Software requirements
IEC 61511-1:2016+AMD1:2017 –, Functional safety – Safety instrumented systems for the process industry
sector – Part 1: Framework, definitions, system, hardware and application programming requirements
EC 62305-1:2010, Protection against lightning – Part 1: General principles
EC 62305-2:2010, Protection against lightning – Part 2: Risk management
IEC 62305-3:2010, Protection against lightning – Part 3: Physical damage to structures and life hazard
IEC 62305-4:2010, Protection against lightning – Part 4: Electrical and electronic systems within structures
IEC IEC 62443-2, Industrial communication networks – network and system security - Part 2: Policies and
Procedures
IEC 62443-3, Industrial communication networks – network and system security – Part 3: System Level
IEC 62443-4, Industrial communication networks – network and system security – Part 4: Component Level
EN 16723-2, Natural gas and biomethane for use in transport and biomethane for injection in the natural gas
network -part 2 – Automotive fuels specification
ISO/FDIS 16923:2025(en)
ISO 2615:2024, Natural gasAnalysis of natural gas —Biomethane — Determination of biomethanethe content
— Gas chromatography methodof compressor oil
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.1 3.1
assembly
sub-system of fuelling stations comprising several components
3.2 3.2
auto-extinguishing
feature of a material that ceases combustion upon removal of flame or ignition source
3.3 3.3
biomethane
methane rich gas derived from biogas or from gasification of biomass by upgrading with the properties similar
to natural gas
[SOURCE: ISO 14532:2014, 2.1.1.15]
3.4 3.4
bonding
equipotential zone where potentially live exposed metallic parts are electrically connected with at least one
point connected to the ground/ or earth
3.5 3.5
breakaway device
coupling that separates at a predetermined section to protect the fuelling station from damage by vehicles
driving away while still connected to the station.
3.6 3.6
buffer storage
one or more suitable pressure vessels designed for the purpose of storing compressed natural gas
3.7 3.7
building
structure, usually enclosed by walls and a roof, constructed to provide support or shelter for an intended
occupancy
3.8 3.8
bundled tube
bundles of small diameter stainless steel tubes contained within a Polyethylenepolyethylene sheath
3.9 3.9
burst pressure
p
b
pressure that causes failure and consequential fluid loss through the component envelope
ISO/FDIS 16923:2025(en)
3.10 3.10
canopy
roof, overhead shelter, or hood, that affords a degree of weather protection
3.11
3.11
compresses natural gas fuelling station
CNG fuelling station
Compresses Natural Gas facility at which compressed natural gas is dispensed to vehicles
3.12 3.12
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 with documented proof of appropriate training
3.13 3.13
compressed natural gas
CNG
natural gas which has been compressed and stored for use as a vehicle fuel
[SOURCE: ISO 15500-1:2000, 3.2]
3.14 3.14
compressor
equipment that increases the pressure of gas
3.15 3.15
conduit
casing, tubing or liner, either metallic or non-metallic
[SOURCE: ISO 14310:2008, 3.6]
3.16 3.16
cylinder
pressure vessel used for the storage of compressed natural gas
3.17 3.17
cylinder working pressure
settled pressure of a fully filled cylinder at a uniform temperature of 15 °C
3.18 3.18
dispenser
equipment through which the fuel is supplied to the vehicle
Note 1 to entry: This equipment can include metering.
3.19 3.19
dryer
item of equipment that decreases the water vapour content (moisture) of natural gas
3.20 3.20
enclosure
structure, not being a building or canopy, that encloses a component of the fuelling station
EXAMPLE Housing, container and machine cabinet.
ISO/FDIS 16923:2025(en)
3.21 3.21
explosive gas atmosphere
mixture of substances with air, under atmospheric conditions, in the form of gases, vapours, mists or dusts in
which, after ignition has occurred, combustion spreads to the entire unburned mixture
[SOURCE: IEC 61340-4-4:2014, 11, 3.4]
3.22 3.22
fail-safe
design feature that ensures a system or component enters or maintains a safe condition in the event of a
malfunction or loss of power supply
Note 1 to entry: A fail-safe function may involve shutdown, isolation, or deactivation of equipment to prevent hazards.
3.23 3.23
fast fill
fuelling operation which has a designed flow rate greater than 100 m (N)/h per nozzle
3.24 3.24
field piping
piping installed for interconnection between equipment at the site
3.25 3.25
fire resistant
property that prevents or retards the passage of excessive heat, hot gases or flames under specified conditions
3.26 3.26
fire wall
wall, or separating partition erected to reduce the effects of radiated heat
3.27 3.27
fuelling
transfer of fuel from dispenser to the vehicle
3.28 3.28
fuelling pressure
pressure at which the fuel is delivered to the vehicle
3.29 3.29
fuelling station
facility at which vehicles fuels are dispensed
3.30 3.30
grounding
electrical connection of potentially live exposed metallic parts to earth
3.31 3.31
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–-1:2008, 3.3]
3.32 3.32
hose
pipeline of flexible material with end fittings attached
ISO/FDIS 16923:2025(en)
3.32.1 3.32.1
vent hose
pipeline of flexible material through which natural gas is vented from the fuelling connection at a vehicle
3.32.2 3.31.2
hose assembly
hose or hoses with ancillary components, such as bend restrictors, breakaways and nozzles, attached
3.33 3.33
intrinsically safe circuit
circuit in which any spark or thermal effect is incapable of causing ignition of a mixture of flammable or
combustible material in air under specified test conditions
3.34 3.34
lower explosive 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”.]
3.35 3.35
maximum allowable operating pressure
MAOP
maximum pressure that the component or system is subjected to during normal operation
Note 1 to entry: MAOP is typically not greater than 90 % of the maximum allowable working pressure of the component
or system.
3.36 3.36
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.]
3.36.1 3.36.1
mobile storage
multi-cylinder or tank fixture mounted on a vehicle or trailer and used for the transportation of natural gas to
Compressed Natural Gas CNG fuelling stations
3.37 3.37
multi-fuel dispenser
dispenser delivering CNG and other fuels (liquid or gaseous)
3.38 3.38
multi-fuel station
fuelling station that can fuel natural gas as well as other fuels, for example diesel, petrol, LPG
3.39 3.39
natural gas
complex gaseous mixture of hydrocarbons, primarily methane, but generally includes ethane, propane and
higher hydrocarbons, and some non-combustible gases such as nitrogen and carbon dioxide
ISO/FDIS 16923:2025(en)
Note 1 to entry: Natural gas can also contain components or containments such as sulfur compounds and/or other
chemical species.
[SOURCE: ISO 14532:2014, 2.1.1.1]
3.40 3.40
non-combustible
not capable of undergoing combustion under specified conditions
[SOURCE: ISO 13943:2008, 4.239]
3.41 3.41
normal operation
situation when the equipment is operating within its design parameters
[SOURCE: ISO 16110-1:2007, 3.50]
3.42 3.42
normally occupied building
a building where people are regularly present for extended durations e.g. home or workplace
3.443.43 3.43
non-hazardous area
area in which an explosive gas is not expected to be present in quantities such as to require special precautions
for the construction, installation and use of apparatus
[SOURCE: ISO 16110-1:2007, 3.48]
3.453.44 3.44
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
Note 1 to entry: ISO/TR 16922 gives the specifications andprovides 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.]
3.463.45 3.45
odorization
process of introducing odorant(s) into natural gas
3.473.46 3.46
overpressure
condition under which the pressure exceeds the maximum allowable working pressure
3.483.47 3.47
piping
system for conveying fluids including pipes, valves, strainers and fittings
[SOURCE: ISO 16818:2008, 3.170]
ISO/FDIS 16923:2025(en)
3.503.48 3.48
power failure
power loss such that any electrical component or sub system stop working (such as flow control) are operating
outside manufacturers specification
3.513.49 3.49
refuelling receptacle
device connected to a vehicle or storage system which receives the CNG refuelling nozzle and permits
safe transfer of fuel
3.523.50 3.50
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 escalating into a larger incident
3.52.13.50.1 3.51.1
external separation distance
separation distance between a hazard source and an object situated outside the boundaries of the fuelling
station
3.52.23.50.2 3.51.2
internal separation distance
separation distance between a hazard source and an object situated within the boundaries of the fuelling
station
3.533.51 3.52
settled pressure
gas pressure when a given settled temperature is reached and there is no gas flow
3.543.52 3.53
settled temperature
uniform gas temperature in the cylinder after the dissipation of any heat caused by fuelling
3.553.53 3.54
self-service
facility where the fuel is dispensed by the user with or without supervision by an attendant.
3.55
3.54 Slow
slow fill
refuelling method where multiple vehicles are connected to a common gas supply manifold and filled
gradually over a predefined time period
Note 1 to entry: Typically used in fleet environments, this method allows unattended overnight fuelling and maycan take
several hours.
3.573.55 3.56
tubing
network of pipes, fittings and valves used to transfer natural gas between items of equipment
Note 1 to entry: Any pipe with an outside diameter less than 25,4 mm (1 in) is classified as "tubing for the purposes of
this document.
3.583.56 3.57
vault
room or space, typically situated underground
ISO/FDIS 16923:2025(en)
3.593.57 3.58
ventilation
movement of air and its replacement with fresh air due to the effects of wind, temperature gradients, or
artificial means (for example fans or extractors)
3.59
Note 1 to entry: Artificial means can include, for example, fans or extractors.
3.58
venting
controlled release of natural gas to the atmosphere
3.603.59 3.60
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 Symbols and abbreviated terms
4.1 Symbols
p
burst pressure
b
p
maximum allowable working pressure
MAWP
4.2 Abbreviated terms
CNG compressed natural gas
IS intrinsically safe
ERP emergency response plan
LEL lower explosive limit
MAOP maximum allowable operating pressure
MAWP maximum allowable working pressure
NGV natural gas vehicle
P&I process and instruments
5 Risk management
5.1 General
5.1.1 Risks shall be managed throughout the life cycle of the CNG 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
reasonably practicable. Risk mitigation can be achieved through various measures to reduce either the
probability or the consequences of a risk scenario.
NOTE Risk mitigation measures may include one or more of the following:
ISO/FDIS 16923:2025(en)
a) a) the use of inherently safe designs and technologies;
b) b) the use of protective devices and systems;
c) c) the adoption of specific operating and maintenance procedures;
d) d) the use of personal protective equipment;
e) e) the provision of information and training;
f) f) the adoption of emergency planning and emergency procedures during the delivery process;
g) g) the need for an emergency stop system that, once activated, stops the filling process and interacts with
valves on the tube trailer or transportable module, as applicable;
h) h) the prevention of public access during the delivery process;
i) i) the isolation of valves at the filling points;
j) j) the adoption of measures to prevent gas storage beyond permitted design limits for volume and
pressure;
k) k) the design of connection points to ensure a connection/disconnection suitable for transport storage and
site storage;
l) l) the identification of losses during the delivery process;
m) m) the protection against breakage of the flexible hose during transfer;
n) n) the identification of hazardous areas around the delivery area;
o) o) the flow control if applicable.
5.1.2 Risk assessment shall follow the techniques described in ISO 12100 for assessment of machinery
safety and IEC 31010 for general site risk management, or local applicable standards.
5.1.3 The CNG fuelling station installation shall be sited to minimize risk to users, operating personnel,
properties, and environment.
5.1.4 Risk assessment shall include design, construction, operation and maintenance of the CNG fuelling
station. The risk assessment process shall be used to evaluate the consequences of hazardous events and to
determine appropriate means of either risk reduction and/or mitigation of consequences, or both.
5.1.5 Measures to reduce fire and explosion risks shall be applied, including but not limited to:
— — prevention of the formation of a flammable or explosive mixture;
— — avoidance of electrostatic risk.;
— — avoidance of ignition sources;
— — mitigation of the effects of a fire or explosion.
5.1.6 Protection against static electricity shall be carried out in accordance with IEC 60079-32-1 and ISO
80079-36 or equivalent standards.
5.1.7 5.1.6 Protection from ignition in explosive atmospheres shall be provided by using protection systems
conforming to IEC 60079-0, IEC 60079-1, IEC 60079-7, and IEC 60079-11, as applicable, and selected and
ISO/FDIS 16923:2025(en)
installed in accordance with IEC 60079-14. Applicable hazard zones shall be determined in accordance with
IEC 60079-10-1.
5.2
5.35.2 .Hazardous area classification
5.3.15.2.1 A hazardous area classification analysis according to IEC 60079-10-1 shall be undertaken for
all the locations in which an explosive gas atmosphere can be present in quantities such as to require special
precautions in relation to electrical and other sources of ignition.
NOTE Annex A Annex A provides recommendations for determining the size of hazardous areas for the major units
of the CNG fuelling station.
5.3.25.2.2 Existing electrical infrastructure, such as high-voltage overhead cables, shall be assessed and
protected to prevent risks of electric shock, arcing, or ignition in hazardous areas. Particular attention shall be
given to insulation integrity and protection against mechanical damage. Overhead power lines shall not pass
above or within a horizontal distance of 3 m3 m from classified ATEX zones or unprotected equipment
associated with the CNG fuelling process. Vaulted or underground installations shall be deemed to provide
engineered protection from overhead power lines.
5.3.35.2.3 If other combustible or hazardous liquids can encroach on any parts of the CNG fuelling station,
means shall be provided to protect those parts.
5.3.45.2.4 Fired equipment (flame heated equipment) shall be located outside hazardous areas and a safe
separation distance.
5.3.55.2.5 The hazardous area shall not exceed the boundaries of the CNG fuelling station within the
separation distances as defined in Table B.1Table B.1 unless a supplementary risk assessment is carried out.
5.45.3 Design and safety requirements for station layout and operation
5.4.15.3.1 Installation and equipment design shall minimize the number of connections and other
possible points of leakage or release to atmosphere.
5.4.25.3.2 Configurations which have the potential to create a confined explosive atmosphere shall be
avoided. Fire and explosion risk prevention shall take into account foreseeable equipment malfunctions and
reasonably foreseeable human error or unintended use.
5.4.35.3.3 Safety distances as defined by local regulations shall be maintained between the natural gas
pipeline, and utility piping and electrical cab
...
PROJET FINAL
Norme
internationale
ISO/FDIS 16923
ISO/TC 340
Stations-service de gaz naturel —
Secrétariat: AFNOR
Stations de gaz naturel comprimé
Début de vote:
(GNC) pour le ravitaillement de
2025-10-08
véhicules
Vote clos le:
2025-12-03
Natural gas fuelling stations — Compressed natural gas (CNG)
stations for fuelling vehicles
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
NORMES POUVANT
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
Numéro de référence
ISO/FDIS 16923:2025(fr) © ISO 2025
PROJET FINAL
ISO/FDIS 16923:2025(fr)
Norme
internationale
ISO/FDIS 16923
ISO/TC 340
Stations-service de gaz naturel —
Secrétariat: AFNOR
Stations de gaz naturel comprimé
Début de vote:
(GNC) pour le ravitaillement de
2025-10-08
véhicules
Vote clos le:
2025-12-03
Natural gas fuelling stations — Compressed natural gas (CNG)
stations for fuelling vehicles
LES DESTINATAIRES DU PRÉSENT PROJET SONT
INVITÉS À PRÉSENTER, AVEC LEURS OBSERVATIONS,
NOTIFICATION DES DROITS DE PROPRIÉTÉ DONT ILS
AURAIENT ÉVENTUELLEMENT CONNAISSANCE ET À
FOURNIR UNE DOCUMENTATION EXPLICATIVE.
DOCUMENT PROTÉGÉ PAR COPYRIGHT
OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES FINS
© ISO 2025 INDUSTRIELLES, TECHNOLOGIQUES ET COM-MERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
PROJETS DE NORMES
TRAITEMENT PARALLÈLE ISO/CEN
INTERNATIONALES DOIVENT PARFOIS ÊTRE CONSIDÉRÉS
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
DU POINT DE VUE DE LEUR POSSI BILITÉ DE DEVENIR DES
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NORMES POUVANT
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
SERVIR DE RÉFÉRENCE DANS LA RÉGLEMENTATION
NATIONALE.
ISO copyright office
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Web: www.iso.org
Publié en Suisse Numéro de référence
ISO/FDIS 16923:2025(fr) © ISO 2025
ii
ISO/FDIS 16923:2025(fr)
Sommaire Page
Avant-propos .v
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 3
4 Symboles et abréviations . 9
4.1 Symboles .9
4.2 Abréviations.9
5 Gestion des risques . 10
5.1 Généralités .10
5.2 Classification des zones dangereuses .11
5.3 Exigences de conception et de sécurité pour la disposition et le fonctionnement de la
station .11
5.4 Disposition du site . 12
5.5 Soupapes de surpression et dégazage . 13
6 Approvisionnement en carburant vers la station-service. 14
6.1 Approvisionnement par canalisations .14
6.2 Approvisionnement par stockage mobile .14
7 Sécheur .15
8 Compresseurs . .16
8.1 Généralités .16
8.2 Instrumentation et contrôle .16
8.3 Conception du compresseur .17
8.3.1 Généralités .17
8.4 Enceintes, bâtiments, auvents pour compresseur .17
8.5 Installations souterraines pour compresseur .18
8.6 Classification des zones dangereuses .19
9 Stockage tampon. 19
9.1 Généralités .19
10 Bornes de distribution. 19
10.1 Exigences générales .19
10.2 Dispositifs de désaccouplement (break-away) . 20
10.3 Ligne de remplissage.21
10.4 Flexibles de distribution . 22
10.5 Enveloppe de la borne de distribution . 22
10.6 Contrôles et instrumentation de ravitaillement . 23
10.7 Systèmes et interconnexions électriques . 25
11 Odorisation du gaz .25
12 Tuyauterie .26
12.1 Généralités . 26
12.2 Conduites enterrées . 26
13 Électricité .27
13.1 Étiquetage .27
13.2 Contact avec des parties sous tension .27
13.3 Câbles .27
13.4 Remise en service après interruption et rétablissement électrique .27
13.5 Électricité et mise à la terre . 28
14 Instrumentation et système de contrôle .28
14.1 Généralités . 28
14.2 Détection gaz. 28
iii
ISO/FDIS 16923:2025(fr)
14.3 Unité d’alimentation sans interruption (ASI) . 29
15 Arrêt d'urgence .29
15.1 Boutons d’arrêt d’urgence . 29
15.2 Procédure d’arrêt d’urgence . . 29
15.3 Rétablissement après arrêt d'urgence . 30
16 Ravitaillement en intérieur .30
16.1 Généralités . 30
16.2 Ventilation . 30
16.3 Exigences complémentaires .31
17 Essais et mise en service .31
18 Fonctionnement .32
18.1 Consignes de distribution .32
18.2 Panneaux de sécurité .32
18.3 Formation . 33
18.4 Plan d'intervention d'urgence . 33
18.5 Mesures en matière de protection contre les explosions . 34
18.6 Manuel d'exploitation . 34
18.7 Documentation . 34
18.7.1 Traçabilité . 34
18.7.2 Documents de réception technique . 34
19 Instructions d'installation et d'exploitation .34
20 Inspection et maintenance . .35
20.1 Programme d'inspection et de maintenance . . 35
20.2 Fréquence de maintenance et d'essais pour la détection gaz . 35
20.3 Opérations de maintenance . 35
20.3.1 Généralités . 35
20.4 Boucles d’instruments . 35
Annexe A (informative) Exemples de classification des zones dangereuses.36
Annexe B (normative) Distances de séparation .43
Annexe C (informative) Procédures de ravitaillement .44
Annexe D (informative) Exemple d'instructions d'urgence .45
Annexe E (informative) Exemple d'inspection et de maintenance périodique d'une station-
service .46
Bibliographie .49
iv
ISO/FDIS 16923:2025(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 16923:2016), qui a fait l'objet d'une
révision technique.
Les principales modifications sont les suivantes:
— clarification et extension du domaine d’application afin d’exclure explicitement les dispositifs de transfert
de véhicule à véhicule et de ravitaillement des véhicules (VRA, Vehicle Refuelling Appliance);
— révision de l’Article 2;
— révision de l’Article 3, avec l’ajout de nouvelles entrées;
— révision de l’article relatif à la gestion des risques afin d’y intégrer une approche fondée sur le cycle de
vie, avec des dispositions renforcées en matière de prévention des incendies, de réduction des explosions
et de protection des appareils;
— révision des dispositions relatives à la conception et à la sécurité afin de les renforcer, y compris les
exigences relatives à la protection physique des appareils à gaz exposés, à la fiabilité des systèmes
électriques et aux protocoles améliorés d’évacuation et d’arrêt;
— révision de l’Annexe A (classification des zones dangereuses) afin de clarifier les responsabilités du
concepteur dans la détermination des zones dangereuses;
v
ISO/FDIS 16923:2025(fr)
— révision des annexes pour refléter les pratiques opérationnelles actuelles, avec des exemples révisés
pour les procédures de ravitaillement, les instructions d’urgence et les programmes de maintenance.
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.
vi
PROJET FINAL Norme internationale ISO/FDIS 16923:2025(fr)
Stations-service de gaz naturel — Stations de gaz naturel
comprimé (GNC) pour le ravitaillement de véhicules
1 Domaine d’application
Le présent document spécifie les exigences relatives à la conception, à la construction, à l’exploitation, à la
maintenance et à l’inspection des stations de ravitaillement au gaz naturel comprimé (GNC) pour véhicules, y
compris les appareils et les dispositifs de sécurité et de contrôle jusqu’au pistolet de distribution au véhicule.
Le présent document s’applique aux stations-service alimentées par gaz naturel comme cela est défini par
les réglementations locales applicables en matière de composition des gaz ou par l’ISO 13686. Il s’applique
également aux autres gaz qui répondent à ces exigences.
Le présent document s’applique également aux parties d’une station-service où le gaz naturel se trouve à
l’état gazeux et où le GNC dérivé d’un gaz naturel liquéfié (GNLC) est distribué conformément à l’ISO 16924.
Le présent document couvre tous les appareils en aval de la connexion d’alimentation en gaz (c’est-à-dire le
point de séparation entre les conduites de la station-service GNC et le réseau de canalisations). Les pistolets
de distribution des stations-service ne sont pas définis dans le présent document.
Le présent document comprend les stations-service avec les caractéristiques suivantes:
— remplissage lent;
— remplissage rapide;
— accès privé;
— accès public (libre-service ou avec assistance);
— stations-service avec stockage fixe;
— stations-service avec stockage mobile (station secondaire);
— stations multi-carburants.
Le présent document ne s’applique pas aux dispositifs de transfert de véhicule à véhicule ou de ravitaillement
de véhicules (VRA).
NOTE Le présent document repose sur la condition que les gaz fournis à la station-service soient odorisés.
Pour les stations-service utilisant des gaz non odorisés, des exigences de sécurité supplémentaires sont spécifiées à
l’Article 10.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur
contenu, des exigences du présent document. Pour les références datées, seule l’édition citée s’applique. Pour
les références non datées, la dernière édition du document de référence s'applique (y compris les éventuels
amendements).
ISO 834-1, Essai de résistance au feu — Éléments de construction — Partie 1: Exigences générales
ISO 4126-1, Dispositifs de sécurité pour protection contre les pressions excessives — Partie 1: Soupapes de sûreté
ISO 30013, Tuyaux en caoutchouc et en plastique — Méthodes d'exposition à des sources lumineuses de
laboratoire — Détermination du changement de coloration, d'aspect et d'autres propriétés physiques
ISO/FDIS 16923:2025(fr)
ISO 9809-1, Bouteilles à gaz — Conception, construction et essais des bouteilles à gaz et des tubes rechargeables
en acier sans soudure — Partie 1: Bouteilles et tubes en acier trempé et revenu ayant une résistance à la traction
inférieure à 1 100 MPa
ISO 9809-2, Bouteilles à gaz — Conception, construction et essais des bouteilles à gaz et des tubes rechargeables
en acier sans soudure — Partie 2: Bouteilles et tubes en acier trempé et revenu ayant une résistance à la traction
supérieure ou égale à 1 100 MPa
ISO 11119-1, Bouteilles à gaz — Conception, construction et essais des tubes et bouteilles à gaz rechargeables en
matériau composite — Partie 1: Tubes et bouteilles à gaz frettés, en matériau composite renforcé par des fibres,
d'une contenance allant jusqu'à 450 l
ISO 11119-2, Bouteilles à gaz — Conception, construction et essais des tubes et bouteilles à gaz rechargeables en
matériau composite — Partie 2: Tubes et bouteilles à gaz entièrement bobinés en matériau composite renforcés
de fibres et d'une contenance allant jusqu'à 450 l avec liners métalliques structuraux
ISO 11119-3, Bouteilles à gaz — Conception, construction et essais des tubes et bouteilles à gaz rechargeables en
matériau composite — Partie 3: Tubes et bouteilles à gaz entièrement bobinés en matériau composite renforcés
de fibres d'une contenance allant jusqu'à 450 l avec liners non métalliques ou métalliques non structuraux, ou
sans liners
ISO 11439, Bouteilles à gaz — Bouteilles haute pression pour le stockage de gaz naturel utilisé comme carburant
à bord des véhicules automobiles
ISO 11925-3, Essais de réaction au feu — Allumabilité des produits du bâtiment soumis à l'incidence directe de la
flamme — Partie 3: Essai multi-sources
ISO 12100, Sécurité des machines — Principes généraux de conception — Appréciation du risque et réduction
du risque
ISO 13847, Industries du pétrole et du gaz naturel — Conduites pour systèmes de transport — Soudage des
conduites
ISO 14120, Sécurité des machines — Protecteurs — Prescriptions générales pour la conception et la construction
des protecteurs fixes et mobiles
ISO 15500-2, Véhicules routiers — Composants des systèmes de combustible gaz naturel comprimé (GNC) —
Partie 2: Performances et méthodes d’essai générales
ISO 15500-17, Véhicules routiers — Composants des systèmes de combustible gaz naturel comprimé (GNC) —
Partie 17: Tuyauterie flexible pour combustible
ISO 15589-1, Industries du pétrole, de la pétrochimie et du gaz naturel — Protection cathodique des systèmes de
transport par conduites — Partie 1: Conduites terrestres
ISO 15649, Industries du pétrole et du gaz naturel — Tuyauterie
ISO 23684, Véhicules routiers — Personnel technique s'occupant des véhicules au gaz naturel (GNV) —
Programmes de formation et de qualification
ISO 20607, Sécurité des machines — Notice d’instructions — Principes rédactionnels généraux
ISO 20816-8, Vibrations mécaniques — Mesurage et évaluation des vibrations des machines — Partie 8:
Systèmes de compresseurs alternatifs
ISO 24671, Véhicules routiers — Qualification et certification du personnel technique chargé des véhicules au
gaz naturel
IEC 31010, Management du risque — Techniques d'appréciation du risque
IEC 60079-0, Atmosphères explosives — Partie 0: Exigences générales
IEC 60079-7, Atmosphères explosives — Partie 7: Protection du matériel par sécurité augmentée «e»
ISO/FDIS 16923:2025(fr)
IEC 60079-10-1, Atmosphères explosives — Partie 10-1: Classification des emplacements — Atmosphères
explosives gazeuses
IEC 60079-11, Atmosphères explosives — Partie 11: Protection de l’appareil par sécurité intrinsèque «i»
IEC 60079-14, Atmosphères explosives — Partie 14: Installations électriques dans les emplacements dangereux
(autres que les mines)
IEC 60079-25, Atmosphères explosives — Partie 25: Systèmes électriques de sécurité intrinsèque
IEC 60079-29-1, Atmosphères explosives — Partie 29-1: Détecteurs de gaz — Exigences d’aptitude à la fonction
des détecteurs de gaz inflammables
IEC 60079-29-4, Atmosphères explosives — Partie 29-4: Détecteurs de gaz — Exigences d’aptitude à la fonction
des détecteurs de gaz inflammables à chemin ouvert
IEC 60204-1, Sécurité des machines — Équipement électrique des machines — Partie 1: Exigences générales
IEC 60529, Degrés de protection procurés par les enveloppes (Code IP)
IEC 61508-1, Sécurité fonctionnelle des systèmes électriques/électroniques/électroniques programmables
relatifs à la sécurité — Partie 1: Exigences générales
IEC 61508-2, Sécurité fonctionnelle des systèmes électriques/électroniques/électroniques programmables relatifs
à la sécurité — Partie 2: Exigences pour les systèmes électriques/électroniques/électroniques programmables
relatifs à la sécurité
IEC 61508-3, Sécurité fonctionnelle des systèmes électriques/électroniques/électroniques programmables
relatifs à la sécurité — Partie 3: Exigences concernant les logiciels
IEC 61511-1:2016+AMD1:2017, Sécurité fonctionnelle — Systèmes instrumentes de sécurité pour le secteur
des industries de transformation — Partie 1: Cadre, définitions, exigences pour le système, le matériel et la
programmation d’application
IEC 62443-2, Industrial communication networks — network and system security — Part 2: Policies and
Procedures (disponible en anglais seulement)
IEC 62443-3, Industrial communication networks — network and system security — Part 3: System Level
(disponible en anglais seulement)
IEC 62443-4, Industrial communication networks — network and system security — Part 4: Component Level
(disponible en anglais seulement)
ISO 2615:2024, Analyse du gaz naturel — Biométhane — Détermination de la teneur en huile de compresseur
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions suivants s'appliquent.
L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en normalisation,
consultables aux adresses suivantes:
— ISO Online browsing platform: disponible à l'adresse https:// www .iso .org/ obp
— IEC Electropedia: disponible à l'adresse https:// www .electropedia .org/
3.1
ensemble
sous-système d'une station-service comprenant plusieurs composants
ISO/FDIS 16923:2025(fr)
3.2
auto-extinguible
caractéristique d'un matériau qui arrête la combustion après le retrait de la flamme ou de la source
d'allumage
3.3
biométhane
gaz riche en méthane provenant du biogaz ou de la gazéification de la biomasse par traitement pour obtenir
des propriétés similaires au gaz naturel
[SOURCE: ISO 14532:2014, 2.1.1.15]
3.4
liaison électrique
zone équipotentielle où les parties métalliques exposées potentiellement sous tension sont connectées
électriquement à au moins un point connecté à la terre ou à la masse
3.5
dispositif de désaccouplement
raccord qui se sépare dans une section prédéterminée pour protéger la station-service des dommages
causés par les véhicules qui s’éloignent alors qu’ils sont toujours raccordés à la station
3.6
stockage tampon
nombre de récipients sous pression adaptés, conçus pour stocker le gaz naturel comprimé
3.7
bâtiment
structure, généralement fermée par des murs et un toit, construite pour fournir un support ou un abri pour
une activité spécifique
3.8
faisceau de tubes
faisceaux de tubes en acier inoxydable de petit diamètre contenus dans une gaine en polyéthylène
3.9
pression d’éclatement
p
b
pression qui provoque la rupture et la perte de liquide consécutive à travers l'enveloppe du composant
3.10
toiture
toit, abri couvert ou couverture offrant un degré de protection contre les intempéries
3.11
station-service de gaz naturel comprimé
station-service GNC
installation où un gaz naturel comprimé est distribué à des véhicules
3.12
personne compétente
personne possédant la capacité, la formation appropriée ainsi que la preuve documentée qui en atteste, les
connaissances et l'expérience pour superviser ou réaliser une tâche de manière sûre et adéquate
3.13
gaz naturel comprimé
GNC
gaz naturel comprimé et stocké pour utilisation comme carburant pour véhicules
[SOURCE: ISO 15500-1:2000, 3.2]
ISO/FDIS 16923:2025(fr)
3.14
compresseur
appareil qui augmente la pression d’un gaz
3.15
conduit
cuvelage, colonne de production ou colonne perdue, qu'ils soient métalliques ou non métalliques
[SOURCE: ISO 14310:2008, 3.6]
3.16
bouteille
récipient sous pression utilisé pour stocker le gaz naturel comprimé
3.17
pression de service d'une bouteille
pression stabilisée d'une bouteille entièrement remplie, à une température uniforme de 15 °C
3.18
borne de distribution
appareil par lequel le carburant est distribué au véhicule
Note 1 à l'article: Cet appareil peut comprendre un compteur.
3.19
sécheur
élément d’appareil diminuant la teneur en vapeur d’eau (humidité) dans le gaz naturel
3.20
enceinte
structure, n'étant ni un bâtiment ni une toiture, qui entoure un composant de la station-service
EXEMPLE Enveloppe, container et cabine pour machines.
3.21
atmosphère de gaz explosive
mélange de substances avec l’air, dans les conditions atmosphériques, sous forme de gaz, vapeurs, brouillards
ou poussières, dans lequel, après inflammation, la combustion se propage à l’ensemble du mélange non brûlé
[SOURCE: IEC 61340-4-4:2014, 11, 3.4]
3.22
à sécurité intégrée
caractéristique de conception qui garantit qu’un système ou un composant entre ou reste dans une condition
de sécurité en cas de dysfonctionnement ou de coupure de l’alimentation électrique
Note 1 à l'article: Une fonction à sécurité intégrée peut impliquer l’arrêt, l’isolation ou la désactivation d’un appareil
afin de prévenir tout danger.
3.23
remplissage rapide
opération de remplissage avec un débit de conception supérieur à 100 Nm /h par pistolet
3.24
canalisation
conduite installée pour assurer l'interconnexion entre les appareils sur le site
3.25
résistant au feu
classe de matériau désignant des composants capables de résister à l'application de chaleur par une flamme
standard pendant 5 min
ISO/FDIS 16923:2025(fr)
3.26
mur coupe-feu
mur, ou cloison de séparation, érigé pour limiter les effets des rayonnements thermiques
3.27
ravitaillement
transfert de carburant depuis une borne de distribution vers le véhicule
3.28
pression de ravitaillement
pression à laquelle le carburant est distribué au véhicule
3.29
station-service
installation où le gaz naturel peut être distribué
3.30
mise à la terre
connexion électrique à la terre des parties métalliques exposées potentiellement sous tension
3.31
zone dangereuse
zone dans laquelle une atmosphère de gaz explosive est présente, ou dans laquelle on peut s'attendre à
ce qu'elle soit présente, en quantités suffisantes pour nécessiter des précautions particulières pour la
construction, l'installation et l'utilisation d’équipements pour éviter toute inflammation
[SOURCE: IEC 60079-10-1:2008, 3.3 - modifié]
3.32
flexible
canalisation en matériau flexible, possédant des raccords d'extrémité
3.32.1
flexible d’évent
canalisation en matériau flexible, à travers laquelle le gaz naturel est évacué depuis la connexion de
ravitaillement à un véhicule
3.32.2
flexible assemblé
flexible ou flexibles, avec des composants auxiliaires, tels que les restricteurs de courbure, raccords
détachables et pistolets, attachés
3.33
circuit intrinsèquement sécurisé
circuit où tout effet thermique ou étincelle est incapable de provoquer l'inflammation d'un mélange de
matériau inflammable ou combustible dans l'air dans des conditions d'essai spécifiées
3.34
limite inférieure d'explosivité
LIE
concentration volumique de gaz ou de vapeur inflammable dans l'air, en deçà de laquelle le mélange n'est pas
inflammable
[SOURCE: ISO 19372:2015, 3.7, modifié — «explosif» a été remplacé par «inflammable».]
3.35
pression maximale admissible
PMAD
pression maximale à laquelle le composant ou système est soumis pendant un fonctionnement normal
Note 1 à l'article: La PMAD est généralement inférieure à 90 % de la pression de service maximale autorisée du
composant ou système
ISO/FDIS 16923:2025(fr)
3.36
pression de service maximale autorisée
MAWP
pression maximale à laquelle un composant ou système est conçu pour être soumis et sur laquelle repose la
détermination de la résistance d'un composant ou système
[SOURCE: ISO 12991:2012, 3.10, modifié — «ou système» a été ajouté et «considéré» a été retiré.]
3.36.1
stockage mobile
installation à bouteilles multiples ou à réservoir sur un véhicule ou une remorque, utilisée pour le transport
du gaz naturel vers les stations-service GNC
3.37
borne de distribution multi-carburants
borne de distribution délivrant des GNC et d'autres carburants (liquides ou gazeux)
3.38
station-service multi-carburants
station-service qui peut fournir du gaz naturel ainsi que d'autres carburants, par exemple gazole,
essence, GPL
3.39
gaz naturel
mélange complexe d’hydrocarbures, composé principalement de méthane, mais comprenant généralement
aussi, de l’éthane, du propane, des hydrocarbures supérieurs, et quelques gaz non combustibles tels que
l’azote et le dioxyde de carbone
Note 1 à l'article: Le gaz naturel peut également contenir des constituants ou des impuretés tels que les composés
soufrés et/ou d'autres espèces chimiques.
[SOURCE: ISO 14532:2014, 2.1.1.1]
3.40
incombustible
ne pouvant subir une combustion dans des conditions spécifiées
[SOURCE: ISO 13943:2008, 4.239]
3.41
fonctionnement normal
situation dans laquelle l'appareil fonctionne conformément à ses paramètres de conception
[SOURCE: ISO 16110-1:2007, 3.50]
3.42
bâtiment normalement occupé
bâtiment où des personnes sont régulièrement présentes pendant de longues périodes, par exemple domicile
ou lieu de travail
3.43
zone de sécurité
zone ne présentant pas d'atmosphère de gaz explosif dans des proportions telles que des précautions
particulières sont nécessaires pour la construction, l'installation et l'utilisation de l'appareillage
[SOURCE: ISO 16110-1:2007, 3.48]
ISO/FDIS 16923:2025(fr)
3.44
odorisant
substance ou combinaison de substances chimiques organiques d’odeur intense ajoutée au gaz naturel à
faible concentration et capable de conférer une odeur d’alerte caractéristique et distinctive (généralement
désagréable) afin de pouvoir détecter des fuites de gaz à des concentrations inférieures à leur limite
inférieure d'inflammabilité
Note 1 à l'article: L’ISO/TR 16922 fournit des lignes directrices sur les méthodes employées pour l’odorisation du
gaz naturel d’un point de vue de la sécurité; elle spécifie les principes pour la technique d’odorisation (y compris la
manutention et le stockage des odorisants) et le contrôle de l’odorisation des gaz naturels.
[SOURCE: ISO 14532:2014, 2.8.1, modifié — La Note 1 à l’article a été ajoutée.]
3.45
odorisation
procédé consistant à introduire un ou plusieurs odorisants dans le gaz naturel
3.46
surpression
condition à laquelle la pression dépasse la pression de service maximale autorisée
3.47
tuyauterie
système de transport de fluides comprenant des tuyaux, des vannes, des crépines et des raccords
[SOURCE: ISO 16818:2008, 3.170]
3.48
interruption électrique
perte d’alimentation électrique entraînant l’arrêt du fonctionnement d’un composant ou sous-système
électrique (tel que le contrôle du débit) en dehors des spécifications du fabricant
3.49
about de ravitaillement
dispositif raccordé à un véhicule ou à un stockage, prévu pour recevoir le pistolet de distribution GNC et
assurer le transfert de carburant en toute sécurité
3.50
distance de séparation
séparation minimale entre une source dangereuse et un objet, permettant de réduire les effets d'un incident
prévisible probable et d'empêcher qu'un incident mineur ne se transforme en incident plus grave
3.50.1
distance de séparation externe
distance de séparation entre une source dangereuse et un objet situé en-dehors des limites de la station-service
3.50.2
distance de séparation interne
distance de séparation entre une source dangereuse et un objet situé à l'intérieur des limites de la station-service
3.51
pression stabilisée
pression du gaz lorsqu'une température stabilisée donnée est atteinte et en l'absence de distribution de gaz
3.52
température stabilisée
température uniforme du gaz dans la bouteille après dissipation de toute chaleur causée par le ravitaillement
3.53
libre-service
installation où le carburant est distribué par l’utilisateur avec ou sans la supervision d’un employé
ISO/FDIS 16923:2025(fr)
3.54
remplissage lent
méthode de ravitaillement dans laquelle plusieurs véhicules sont raccordés à un collecteur d’alimentation en
gaz commun et remplis progressivement pendant une période prédéfinie
Note 1 à l'article: Habituellement utilisée dans les flottes, cette méthode permet un ravitaillement nocturne sans
surveillance et peut prendre plusieurs heures.
3.55
tubulure
réseau de canalisations, raccords et vannes utilisé pour transférer le gaz naturel entre les différents
appareils
Note 1 à l'article: Tout tuyau dont le diamètre extérieur est inférieur à 25,4 mm (1 po) est classé comme
...
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