SIST ISO 16923:2017
Natural gas fuelling stations - CNG stations for fuelling vehicles
Natural gas fuelling stations - 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 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 comprim� (GNC) pour v�hicules, dont les appareils et les dispositifs de s�curit� et de contr�le.
L'ISO 16923:2016 s'applique �galement aux parties d'une station-service o� le gaz naturel se trouve � l'�tat gazeux et o� le GNC d�riv� d'un gaz naturel liqu�fi� (GNCL) est distribu� conform�ment � l'ISO 16924.
L'ISO 16923:2016 s'applique aux stations-service aliment�es par gaz naturel tel que d�fini par les r�glements locaux applicables relatifs � la composition des gaz ou par l'ISO 13686. Elle s'applique �galement � d'autres gaz satisfaisant � ces exigences tels que le biom�thane, le m�thane de houille (MH) valoris� 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-�-dire le point de s�paration entre les conduites de la station-service GNC et le r�seau de canalisations). Les pistolets de distribution des stations-service ne sont pas d�finis dans ce document.
L'ISO 16923:2016 comprend les stations-service avec les caract�ristiques suivantes:
- remplissage lent;
- remplissage rapide;
- acc�s priv�;
- acc�s 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 � la station-service sont odoris�s. Pour les stations-service utilisant des gaz non odoris�s, des exigences de s�curit� suppl�mentaires sont sp�cifi�es � l'Article 10.
Polnilne postaje za oskrbo z zemeljskim plinom - Postaje za oskrbo vozil s stisnjenim zemeljskim plinom
Standard obravnava načrtovanje, gradnjo, delovanje, nadzor in vzdrževanje polnilnih postaj za oskrbo vozil s stisnjenim zemeljskim plinom (CNG), vključno z opremo ter varnostnimi in kontrolnimi napravami. Velja za dele polnilne postaje, kjer je zemeljski plin v plinastem stanju in distribucija zemeljskega plina izhaja iz utekočinjenega zemeljskega plina (LCNG) v skladu z ISO 16924, in za polnilne postaje, oskrbovane z zemeljskim plinom, kot je opredeljen v veljavnih lokalnih predpisih o sestavi plina ali v ISO 13686. Uporablja se tudi za druge pline, ki izpolnjujejo te zahteve, vključno z biometanom, izboljšanim metanom iz premogovnih ležišč (CBM) in zalogami plina iz uplinjanja utekočinjenega zemeljskega plina (v obratu ali zunaj njega). Standard ne velja za domače polnilne naprave za stisnjeni zemeljski plin brez začasnega skladiščenja.
Vključuje vso opremo za priključevanje (tj. na točki med cevovodom polnilne postaje stisnjenega zemeljskega plina in plinovodnim omrežjem). Šobe polnilne postaje v tem standardu niso vključene.
Standard vključuje polnilne postaje z naslednjimi značilnostmi:
‒ počasno polnjenje,
‒ hitro polnjenje,
‒ zasebni dostop,
‒ javni dostop (samopostrežni ali z asistenco),
‒ polnilne postaje s fiksnim/stalnim skladiščenjem,
‒ polnilne postaje z mobilnim/premičnim skladiščenjem (hčerinska postaja),
‒ postaje z različnimi vrstami goriva.
OPOMBA: Ta standard temelji na pogoju, da je plin, ki vstopa na polnilno postajo, odoriziran. Za polnilne postaje z neodoriziranim plinom so dodatne varnostne zahteve vključene v točki 10.
General Information
Buy Standard
Standards Content (Sample)
SLOVENSKI STANDARD
SIST ISO 16923:2017
01-september-2017
Polnilne postaje za oskrbo z zemeljskim plinom - Postaje za oskrbo vozil s
stisnjenim zemeljskim plinom
Natural gas fuelling stations - CNG stations for fuelling vehicles
Stations-service de gaz naturel - Stations GNC pour le ravitaillement de véhicules
Ta slovenski standard je istoveten z: ISO 16923:2016
ICS:
75.200 2SUHPD]DVNODGLãþHQMH Petroleum products and
QDIWHQDIWQLKSURL]YRGRYLQ natural gas handling
]HPHOMVNHJDSOLQD equipment
SIST ISO 16923:2017 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ISO 16923:2017
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SIST ISO 16923:2017
INTERNATIONAL ISO
STANDARD 16923
First edition
2016-12-15
Natural gas fuelling stations — CNG
stations for fuelling vehicles
Stations-service de gaz naturel — Stations GNC pour le ravitaillement
de véhicules
Reference number
ISO 16923:2016(E)
©
ISO 2016
---------------------- Page: 3 ----------------------
SIST ISO 16923:2017
ISO 16923:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 16923:2017
ISO 16923:2016(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 8
4.1 Symbols . 8
4.2 Abbreviated terms . 8
5 Risk management . 8
6 General design requirements . 9
6.1 General . 9
6.2 Site layout .10
6.3 Pressure safety relief valves and venting .10
7 Fuel supply to the fuelling station .11
7.1 Supply by pipeline .11
7.2 Supply by mobile storage .11
8 Dryer .12
9 Compressors .12
9.1 General .12
9.2 Instrumentation and control .13
9.3 Crankcase design .13
9.4 Compressor enclosures, buildings and canopies .14
9.5 Underground compressor installations .16
9.6 Hazardous area classification.16
10 Buffer storage .16
11 Dispensers .17
11.1 General requirements .17
11.2 Breakaway devices .17
11.3 Fuelling hose assemblies .18
11.4 Fuelling hoses .19
11.5 Enclosure .19
11.6 Fuelling controls and instrumentation .20
11.7 Electrical systems and interconnections .22
11.8 Documentation .22
12 Gas odorization .22
13 Pipework .23
13.1 General .23
13.2 Buried piping .23
14 Electrical .24
14.1 Labelling .24
14.2 Contact with live parts.24
14.3 Cables .24
14.4 Performance after power fail and restoration .24
14.5 Electrical bonding and grounding .25
15 Instrumentation and control system .25
15.1 Gas detection .25
15.2 Emergency shutdown devices .25
16 Emergency shutdown .26
16.1 Emergency shutdown procedure .26
© ISO 2016 – All rights reserved iii
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SIST ISO 16923:2017
ISO 16923:2016(E)
16.2 Restoration after emergency shutdown .26
17 Indoor fuelling .26
17.1 General .26
17.2 Ventilation .26
17.3 Additional requirements .27
18 Testing and commissioning .27
19 Operation .28
19.1 Fuelling procedures .28
19.2 Safety signs .28
19.3 Training .28
19.4 Emergency response plan .29
19.5 Operations manual .29
20 Inspection and maintenance .29
20.1 Inspection and maintenance program.29
20.2 Maintenance and testing frequency of gas detection .30
Annex A (informative) Examples of hazardous zone classification .31
Annex B (normative) Separation distances .38
Annex C (informative) Fuelling procedures .39
Annex D (informative) Emergency instructions example .40
Annex E (informative) Example of fuelling station periodic inspection and maintenance .41
Bibliography .43
iv © ISO 2016 – All rights reserved
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SIST ISO 16923:2017
ISO 16923:2016(E)
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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/PC 252, Natural gas fuelling stations for vehicles.
© ISO 2016 – All rights reserved v
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SIST ISO 16923:2017
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SIST ISO 16923:2017
INTERNATIONAL STANDARD ISO 16923:2016(E)
Natural gas fuelling stations — CNG stations for fuelling
vehicles
1 Scope
This document covers the design, construction, operation, inspection and maintenance of stations for
fuelling compressed natural gas (CNG) to vehicles, including equipment, safety and control devices.
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 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).
This document 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.
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 domestic CNG fuelling devices without buffer storage.
NOTE This document is based on the condition that the gas entering the fuelling station is odorized. For
unodorized gas fuelling stations, additional safety requirements are included in Clause 10.
2 Normative references
The following documents are referred to in 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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 834-1, Fire-resistance tests — Elements of building construction — Part 1: General requirements
ISO 4126-1, Safety devices for protection against excessive pressure — Part 1: Safety valves
ISO 8580, Rubber and plastics hoses — Determination of ultra-violet resistance under static conditions
© ISO 2016 – All rights reserved 1
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SIST ISO 16923:2017
ISO 16923:2016(E)
ISO 9809-1, Gas cylinders — Refillable seamless steel gas cylinders — Design, construction and testing —
Part 1: Quenched and tempered steel cylinders with tensile strength less than 1 100 MPa
ISO 9809-2, Gas cylinders — Refillable seamless steel gas cylinders — Design, construction and testing —
Part 2: Quenched and tempered steel cylinders with tensile strength greater than or equal to 1 100 MPa
ISO 11119-1, Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and
testing —Part 1: Hoop wrapped fibre reinforced composite gas cylinders and tubes up to 450 l
ISO 11119-2, Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and
testing — 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 — Refillable composite gas cylinders and tubes — Design, construction and
testing — Part 3: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450L with non-
load-sharing metallic or non-metallic 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
IEC 31010, Risk management — Risk assessment techniques
IEC 60079-0, Electrical apparatus for explosive gas atmospheres — Part 0: General requirements
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 60204-1, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60529, Degrees of protection provided by enclosures (IP Code)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2 © ISO 2016 – All rights reserved
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SIST ISO 16923:2017
ISO 16923:2016(E)
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
assembly
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 ground/earth
3.5
breakaway device
coupling which separates at a predetermined section when required and each separated section
contains a self-closing shut-off valve which seals automatically
[SOURCE: ISO/TS 18683:2015, 3.1.3]
3.6
buffer storage
one or more suitable pressure vessels designed for the purpose of storing compressed natural gas
3.7
building
structures, usually enclosed by walls and a roof, constructed to provide support or shelter for an
intended occupancy
3.8
burst pressure
p
b
pressure that causes failure and consequential fluid loss through the component envelope
3.9
canopy
roof, overhead shelter, or hood, that affords a degree of weather protection
3.10
CNG fuelling station
facility at which compressed natural gas is dispensed to vehicles
3.11
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
© ISO 2016 – All rights reserved 3
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SIST ISO 16923:2017
ISO 16923:2016(E)
3.12
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]
3.13
compressor
machine that increases the pressure of gas
3.14
conduit
casing, tubing or liner, either metallic or non-metallic
[SOURCE: ISO 14310:2008, 3.6]
3.15
cylinder
pressure vessel used for the storage of compressed natural gas
3.16
cylinder working pressure
settled pressure of a fully filled cylinder at a uniform temperature of 15 °C
3.17
dispenser
equipment through which the fuel is supplied to the vehicle
Note 1 to entry: This equipment can include metering.
3.18
dryer
equipment which decreases the water vapour content (moisture) of natural gas
3.19
enclosure
structure, not being a building or canopy, that encloses a component of the fuelling station
EXAMPLE Housing, container and machine cabinet.
3.20
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]
3.21
fail-safe
design feature that ensures that safe conditions are maintained in the event of a malfunction of a
control device or an interruption of a supply source
3.22
fast fill
3
fuelling operation which has a designed flow rate greater than 100 m (N)/h per nozzle
3.23
field piping
piping installed for interconnection between equipment at the site
4 © ISO 2016 – All rights reserved
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SIST ISO 16923:2017
ISO 16923:2016(E)
3.24
fire resistant
property that prevents or retards the passage of excessive heat, hot gases or flames under specified
conditions
3.25
fire wall
wall, or separating partition erected to reduce the effects of radiated heat
3.26
fuelling
transfer of fuel from dispenser to the vehicle
3.27
fuelling pressure
pressure at which the fuel is delivered to the vehicle
3.28
fuelling station
facility at which vehicles fuels are dispensed
3.29
grounding
electrical connection of potentially live exposed metallic parts to earth
3.30
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]
3.31
hose
pipeline of flexible material with end fittings attached
3.31.1
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
3.32
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
3.33
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”.]
© ISO 2016 – All rights reserved 5
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SIST ISO 16923:2017
ISO 16923:2016(E)
3.34
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.
3.35
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
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
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 combust
...
INTERNATIONAL ISO
STANDARD 16923
First edition
2016-12-15
Natural gas fuelling stations — CNG
stations for fuelling vehicles
Stations-service de gaz naturel — Stations GNC pour le ravitaillement
de véhicules
Reference number
ISO 16923:2016(E)
©
ISO 2016
---------------------- Page: 1 ----------------------
ISO 16923:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 16923:2016(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 8
4.1 Symbols . 8
4.2 Abbreviated terms . 8
5 Risk management . 8
6 General design requirements . 9
6.1 General . 9
6.2 Site layout .10
6.3 Pressure safety relief valves and venting .10
7 Fuel supply to the fuelling station .11
7.1 Supply by pipeline .11
7.2 Supply by mobile storage .11
8 Dryer .12
9 Compressors .12
9.1 General .12
9.2 Instrumentation and control .13
9.3 Crankcase design .13
9.4 Compressor enclosures, buildings and canopies .14
9.5 Underground compressor installations .16
9.6 Hazardous area classification.16
10 Buffer storage .16
11 Dispensers .17
11.1 General requirements .17
11.2 Breakaway devices .17
11.3 Fuelling hose assemblies .18
11.4 Fuelling hoses .19
11.5 Enclosure .19
11.6 Fuelling controls and instrumentation .20
11.7 Electrical systems and interconnections .22
11.8 Documentation .22
12 Gas odorization .22
13 Pipework .23
13.1 General .23
13.2 Buried piping .23
14 Electrical .24
14.1 Labelling .24
14.2 Contact with live parts.24
14.3 Cables .24
14.4 Performance after power fail and restoration .24
14.5 Electrical bonding and grounding .25
15 Instrumentation and control system .25
15.1 Gas detection .25
15.2 Emergency shutdown devices .25
16 Emergency shutdown .26
16.1 Emergency shutdown procedure .26
© ISO 2016 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 16923:2016(E)
16.2 Restoration after emergency shutdown .26
17 Indoor fuelling .26
17.1 General .26
17.2 Ventilation .26
17.3 Additional requirements .27
18 Testing and commissioning .27
19 Operation .28
19.1 Fuelling procedures .28
19.2 Safety signs .28
19.3 Training .28
19.4 Emergency response plan .29
19.5 Operations manual .29
20 Inspection and maintenance .29
20.1 Inspection and maintenance program.29
20.2 Maintenance and testing frequency of gas detection .30
Annex A (informative) Examples of hazardous zone classification .31
Annex B (normative) Separation distances .38
Annex C (informative) Fuelling procedures .39
Annex D (informative) Emergency instructions example .40
Annex E (informative) Example of fuelling station periodic inspection and maintenance .41
Bibliography .43
iv © ISO 2016 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 16923:2016(E)
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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/PC 252, Natural gas fuelling stations for vehicles.
© ISO 2016 – All rights reserved v
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INTERNATIONAL STANDARD ISO 16923:2016(E)
Natural gas fuelling stations — CNG stations for fuelling
vehicles
1 Scope
This document covers the design, construction, operation, inspection and maintenance of stations for
fuelling compressed natural gas (CNG) to vehicles, including equipment, safety and control devices.
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 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).
This document 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.
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 domestic CNG fuelling devices without buffer storage.
NOTE This document is based on the condition that the gas entering the fuelling station is odorized. For
unodorized gas fuelling stations, additional safety requirements are included in Clause 10.
2 Normative references
The following documents are referred to in 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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 834-1, Fire-resistance tests — Elements of building construction — Part 1: General requirements
ISO 4126-1, Safety devices for protection against excessive pressure — Part 1: Safety valves
ISO 8580, Rubber and plastics hoses — Determination of ultra-violet resistance under static conditions
© ISO 2016 – All rights reserved 1
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ISO 16923:2016(E)
ISO 9809-1, Gas cylinders — Refillable seamless steel gas cylinders — Design, construction and testing —
Part 1: Quenched and tempered steel cylinders with tensile strength less than 1 100 MPa
ISO 9809-2, Gas cylinders — Refillable seamless steel gas cylinders — Design, construction and testing —
Part 2: Quenched and tempered steel cylinders with tensile strength greater than or equal to 1 100 MPa
ISO 11119-1, Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and
testing —Part 1: Hoop wrapped fibre reinforced composite gas cylinders and tubes up to 450 l
ISO 11119-2, Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and
testing — 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 — Refillable composite gas cylinders and tubes — Design, construction and
testing — Part 3: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450L with non-
load-sharing metallic or non-metallic 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
IEC 31010, Risk management — Risk assessment techniques
IEC 60079-0, Electrical apparatus for explosive gas atmospheres — Part 0: General requirements
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 60204-1, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60529, Degrees of protection provided by enclosures (IP Code)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2 © ISO 2016 – All rights reserved
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ISO 16923:2016(E)
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
assembly
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 ground/earth
3.5
breakaway device
coupling which separates at a predetermined section when required and each separated section
contains a self-closing shut-off valve which seals automatically
[SOURCE: ISO/TS 18683:2015, 3.1.3]
3.6
buffer storage
one or more suitable pressure vessels designed for the purpose of storing compressed natural gas
3.7
building
structures, usually enclosed by walls and a roof, constructed to provide support or shelter for an
intended occupancy
3.8
burst pressure
p
b
pressure that causes failure and consequential fluid loss through the component envelope
3.9
canopy
roof, overhead shelter, or hood, that affords a degree of weather protection
3.10
CNG fuelling station
facility at which compressed natural gas is dispensed to vehicles
3.11
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
© ISO 2016 – All rights reserved 3
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ISO 16923:2016(E)
3.12
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]
3.13
compressor
machine that increases the pressure of gas
3.14
conduit
casing, tubing or liner, either metallic or non-metallic
[SOURCE: ISO 14310:2008, 3.6]
3.15
cylinder
pressure vessel used for the storage of compressed natural gas
3.16
cylinder working pressure
settled pressure of a fully filled cylinder at a uniform temperature of 15 °C
3.17
dispenser
equipment through which the fuel is supplied to the vehicle
Note 1 to entry: This equipment can include metering.
3.18
dryer
equipment which decreases the water vapour content (moisture) of natural gas
3.19
enclosure
structure, not being a building or canopy, that encloses a component of the fuelling station
EXAMPLE Housing, container and machine cabinet.
3.20
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]
3.21
fail-safe
design feature that ensures that safe conditions are maintained in the event of a malfunction of a
control device or an interruption of a supply source
3.22
fast fill
3
fuelling operation which has a designed flow rate greater than 100 m (N)/h per nozzle
3.23
field piping
piping installed for interconnection between equipment at the site
4 © ISO 2016 – All rights reserved
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ISO 16923:2016(E)
3.24
fire resistant
property that prevents or retards the passage of excessive heat, hot gases or flames under specified
conditions
3.25
fire wall
wall, or separating partition erected to reduce the effects of radiated heat
3.26
fuelling
transfer of fuel from dispenser to the vehicle
3.27
fuelling pressure
pressure at which the fuel is delivered to the vehicle
3.28
fuelling station
facility at which vehicles fuels are dispensed
3.29
grounding
electrical connection of potentially live exposed metallic parts to earth
3.30
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]
3.31
hose
pipeline of flexible material with end fittings attached
3.31.1
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
3.32
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
3.33
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”.]
© ISO 2016 – All rights reserved 5
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ISO 16923:2016(E)
3.34
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.
3.35
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
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
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
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]
6 © ISO 2016 – All rights reserved
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ISO 16923:2016(E)
3.43
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
odor so gas leaks can be detected at concentrations below their lower flammability limit
Note 1 to entry: ISO/TR 16922 gives the specifications and guidelines for the methods to be used in the
odorization of natural gas under a safety point of view and specifies the principles for the odorization technique
(including handling and storage of odorants) and
...
NORME ISO
INTERNATIONALE 16923
Première édition
2016-12-15
Stations-service de gaz naturel —
Stations GNC pour le ravitaillement de
véhicules
Natural gas fuelling stations — CNG stations for fuelling vehicles
Numéro de référence
ISO 16923:2016(F)
©
ISO 2016
---------------------- Page: 1 ----------------------
ISO 16923:2016(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2016, Publié en Suisse
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni utilisée
sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie, l’affichage sur
l’internet ou sur un Intranet, sans autorisation écrite préalable. Les demandes d’autorisation peuvent être adressées à l’ISO à
l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – Tous droits réservés
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ISO 16923:2016(F)
Sommaire Page
Avant-propos .v
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 3
4 Symboles et abréviations . 8
4.1 Symboles . 8
4.2 Abréviations . 9
5 Gestion des risques . 9
6 Exigences de conception générales . 9
6.1 Généralités . 9
6.2 Disposition du site .10
6.3 Soupapes de surpression et dégazage .11
7 Approvisionnement en carburant vers la station-service .12
7.1 Approvisionnement par canalisations.12
7.2 Approvisionnement par stockage mobile .12
8 Sécheur .13
9 Compresseurs .13
9.1 Généralités .13
9.2 Instrumentation et contrôle .14
9.3 Conception du carter .14
9.4 Enceintes, bâtiments, auvents pour compresseur.16
9.5 Installations souterraines pour compresseur .17
9.6 Classification des emplacements dangereux .18
10 Stockage tampon .18
11 Bornes de distribution .18
11.1 Exigences générales .18
11.2 Dispositifs de désaccouplement (break-away) .19
11.3 Ligne de remplissage .20
11.4 Flexibles de distribution .21
11.5 Enceinte.21
11.6 Contrôles et instrumentation de ravitaillement .22
11.7 Systèmes et interconnexions électriques .24
11.8 Documentation .24
12 Odorisation du gaz .25
13 Tuyauterie .25
13.1 Généralités .25
13.2 Conduites enterrées.25
14 Électricité .26
14.1 Étiquetage .26
14.2 Contact avec des parties sous tension .26
14.3 Câbles .27
14.4 Remise en service après interruption et rétablissement électrique .27
14.5 Liaison électrique et mise à la terre .27
15 Instrumentation et système de contrôle .27
15.1 Détection gaz .27
15.2 Boutons d’arrêt d’urgence .28
16 Arrêt d’urgence .28
16.1 Procédure d’arrêt d’urgence .28
© ISO 2016 – Tous droits réservés iii
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ISO 16923:2016(F)
16.2 Rétablissement après arrêt d’urgence .28
17 Ravitaillement en intérieur .29
17.1 Généralités .29
17.2 Ventilation .29
17.3 Exigences supplémentaires.29
18 Essais et mise en service .30
19 Fonctionnement .30
19.1 Consignes de distribution .30
19.2 Panneaux de sécurité .30
19.3 Formation .31
19.4 Plan d’intervention d’urgence . .31
19.5 Manuel d’exploitation .31
20 Inspection et maintenance .32
20.1 Programme d’inspection et de maintenance .32
20.2 Fréquence de maintenance et d’essais pour la détection gaz .32
Annexe A (informative) Exemples de classification d’emplacements dangereux .33
Annexe B (normative) Distances de séparation .40
Annexe C (informative) Procédures de ravitaillement .41
Annexe D (informative) Exemple d’instructions d’urgence .42
Annexe E (informative) Exemple d’inspection et de maintenance périodique
d’une station-service .43
Bibliographie .46
iv © ISO 2016 – Tous droits réservés
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ISO 16923:2016(F)
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’attention est appelée sur le fait que certains des éléments du présent document peuvent faire l’objet de
droits de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable
de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant
les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de
l’élaboration du document sont indiqués dans l’Introduction et/ou dans la liste des déclarations de
brevets reçues par l’ISO (voir www.iso.org/brevets).
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 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 le lien
suivant: www.iso.org/iso/fr/avant-propos.html
L’ISO 16923 a été élaborée par le comité technique ISO/PC 252, Stations de ravitaillement de gaz naturel
pour véhicules.
© ISO 2016 – Tous droits réservés v
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NORME INTERNATIONALE ISO 16923:2016(F)
Stations-service de gaz naturel — Stations GNC pour le
ravitaillement de véhicules
1 Domaine d’application
Ce document 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.
Ce 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 (GNCL) est distribué conformément à l’ISO 16924.
Ce document 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).
Ce 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 ce document.
Ce document 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.
Ce document ne s’applique pas aux dispositifs domestiques de ravitaillement de GNC sans stockage
tampon.
NOTE Ce document 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.
2 Références normatives
Les documents suivants sont mentionnés dans le texte de sorte que tout ou partie de leur contenu
constitue des exigences de ce 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 7-1, Filetages de tuyauterie pour raccordement avec étanchéité dans le filet — Partie 1: Dimensions,
tolérances et désignation
ISO 834-1, Essai de résistance au feu — Éléments de construction — Partie 1: Exigences générales
© ISO 2016 – Tous droits réservés 1
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ISO 16923:2016(F)
ISO 4126-1, Dispositifs de sécurité pour protection contre les pressions excessives — Partie 1: Soupapes
de sûreté
ISO 8580, Tuyaux en caoutchouc et en plastique — Détermination de la résistance aux ultraviolets dans des
conditions statiques
ISO 9809-1, Bouteilles à gaz — Bouteilles à gaz rechargeables en acier sans soudure — Conception,
construction et essais — Partie 1: Bouteilles en acier trempé et revenu ayant une résistance à la traction
inférieure à 1 100 MPa
ISO 9809-2, Bouteilles à gaz — Bouteilles à gaz rechargeables en acier sans soudure — Conception,
construction et essais — Partie 2: Bouteilles en acier trempé et revenu ayant une résistance à la traction
supérieure ou égale à 1 100 MPa
ISO 11119-1, Bouteilles à gaz — Bouteilles à gaz rechargeables en matériau composite et tubes —
Conception, construction et essais — Partie 1: Bouteilles à gaz frettées en matériau composite renforcé par
des fibres et tubes d’une contenance allant jusqu’à 450 l
ISO 11119-2, Bouteilles à gaz — Bouteilles à gaz rechargeables en matériau composite et tubes —
Conception, construction et essais — Partie 2: Bouteilles à gaz composites entièrement bobinées renforcées
par des fibres et tubes d’une contenance allant jusqu’à 450 l avec liners métalliques transmettant la charge
ISO 11119-3, Bouteilles à gaz — Bouteilles à gaz rechargeables en matériau composite et tubes —
Conception, construction et essais — Partie 3: Bouteilles à gaz composites entièrement bobinées renforcées
par des fibres et tubes d’une contenance allant jusqu’à 450 l avec liners métalliques ou non métalliques ne
transmettant pas la charge
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
IEC 31010, Gestion des risques — Techniques d’évaluation des risques
IEC 60079-0, Matériel électrique pour atmosphères explosives gazeuses — Partie 0: Exigences générales
IEC 60079-10-1, Atmosphères explosives — Partie 10-1: Classement des emplacements — Atmosphères
explosives gazeuses
IEC 60079-11, Atmosphères explosives — Partie 11: protection de l’équipement par sécurité intrinsèque «i»
2 © ISO 2016 – Tous droits réservés
---------------------- Page: 7 ----------------------
ISO 16923:2016(F)
IEC 60079-14, Matériel électrique pour atmosphères explosives gazeuses — 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 60204-1, Sécurité des machines — Équipement électrique des machines — Partie 1: Exigences générales
IEC 60529, Degrés de protection procurés par les enveloppes (code IP)
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:
— IEC Electropedia: disponible à l’adresse http://www.electropedia.org/
— ISO Online browsing platform: disponible à l’adresse http://www.iso.org/obp
3.1
ensemble
sous-système d’une station-service comprenant plusieurs composants
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/masse
3.5
dispositif de désaccouplement
couplage qui se sépare à une section prédéterminée lorsque nécessaire et chaque section séparée
contient une vanne d’arrêt à fermeture automatique qui scelle automatiquement
[SOURCE: ISO/TS 18683:2015, 3.1.3]
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
© ISO 2016 – Tous droits réservés 3
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ISO 16923:2016(F)
3.8
pression d’éclatement
Pe
pression qui provoque une défaillance et résulte en une perte de fluide à travers l’enveloppe d’un
composant
3.9
auvent
toit, abri couvert ou couverture offrant un degré de protection contre les intempéries
3.10
station-service GNC
installation où un gaz naturel comprimé est distribué à des véhicules
3.11
personne compétente
personne possédant la capacité, la formation appropriée, les connaissances et l’expérience pour
superviser ou réaliser une tâche de manière sûre et adéquate
3.12
gaz naturel comprimé
GNC
machine gaz naturel comprimé et stocké pour utilisation comme carburant
[SOURCE: ISO 15500-1:2000, 3.2]
3.13
compresseur
machine qui augmente la pression d’un gaz
3.14
conduit
cuvelage, colonne de production ou colonne perdue, qu’ils soient métalliques ou non métalliques
[SOURCE: ISO 14310:2008, 3.6]
3.15
bouteille
récipient sous pression utilisé pour stocker le gaz naturel comprimé
3.16
pression de service d’une bouteille
pression stabilisée d’une bouteille entièrement remplie, à une température uniforme de 15 °C
3.17
borne de distribution
appareil par lequel le carburant est distribué au véhicule
Note 1 à l’article: Cet appareil peut comprendre un compteur.
3.18
sécheur
appareil diminuant la teneur en vapeur d’eau (humidité) dans le gaz naturel
3.19
enceinte
structure, n’étant ni un bâtiment ni un auvent, qui entoure un composant de la station-service
EXEMPLE Enveloppe, container et cabine pour machines.
4 © ISO 2016 – Tous droits réservés
---------------------- Page: 9 ----------------------
ISO 16923:2016(F)
3.20
atmosphère 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]
3.21
à sécurité intégrée
caractéristique de conception qui s’assure que des conditions de fonctionnement sûres sont maintenues
en cas de dysfonctionnement des dispositifs de contrôle ou en cas d’interruption d’une source
d’approvisionnement
3.22
remplissage rapide
3
opération de remplissage avec un débit de conception supérieur à 100 Nm /h par pistolet
3.23
canalisation
conduite installée pour assurer l’interconnexion entre les appareils sur le site
3.24
résistant au feu
classe de matériau désignant des composants capables de résister à l’application de chaleur par une
flamme standard pendant 5 min
3.25
mur coupe-feu
mur, ou cloison de séparation, érigé pour limiter les effets des rayonnements thermiques
3.26
ravitaillement
transfert de carburant depuis une borne de distribution vers le véhicule
3.27
pression de ravitaillement
pression à laquelle le carburant est distribué au véhicule
3.28
station-service
installation où le gaz naturel peut être distribué
3.29
mise à la terre
connexion électrique à la terre des parties métalliques exposées potentiellement sous tension
3.30
emplacement dangereux
emplacement dans lequel une atmosphère explosive est présente, ou dans lequel 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 60079-1:2008, 3.3]
3.31
flexible
canalisation en matériau flexible, possédant des raccords d’extrémité
© ISO 2016 – Tous droits réservés 5
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ISO 16923:2016(F)
3.31.1
flexible d’évent
canalisation en matériau flexible, à travers laquelle le gaz naturel est évacué depuis la connexion de
ravitaillement à un véhicule
3.31.2
ensemble de flexible
flexible ou flexibles, avec des composants auxiliaires, tels que les restricteurs de courbure, raccords
détachables et pistolets, attachés
3.32
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
3.33
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, modifiée – «explosif» a été remplacé par «inflammable»]
3.34
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
3.35
pression de service maximale autorisée
PSMA
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, modifiée – «ou sys
...
SLOVENSKI STANDARD
oSIST ISO 16923:2017
01-julij-2017
Polnilne postaje za oskrbo z zemeljskim plinom - Postaje za oskrbo vozil s
stisnjenim zemeljskim plinom
Natural gas fuelling stations - CNG stations for fuelling vehicles
Stations-service de gaz naturel - Stations GNC pour le ravitaillement de véhicules
Ta slovenski standard je istoveten z: ISO 16923:2016
ICS:
75.200 2SUHPD]DVNODGLãþHQMH Petroleum products and
QDIWHQDIWQLKSURL]YRGRYLQ natural gas handling
]HPHOMVNHJDSOLQD equipment
oSIST ISO 16923:2017 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST ISO 16923:2017
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oSIST ISO 16923:2017
INTERNATIONAL ISO
STANDARD 16923
First edition
2016-12-15
Natural gas fuelling stations — CNG
stations for fuelling vehicles
Stations-service de gaz naturel — Stations GNC pour le ravitaillement
de véhicules
Reference number
ISO 16923:2016(E)
©
ISO 2016
---------------------- Page: 3 ----------------------
oSIST ISO 16923:2017
ISO 16923:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
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oSIST ISO 16923:2017
ISO 16923:2016(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 8
4.1 Symbols . 8
4.2 Abbreviated terms . 8
5 Risk management . 8
6 General design requirements . 9
6.1 General . 9
6.2 Site layout .10
6.3 Pressure safety relief valves and venting .10
7 Fuel supply to the fuelling station .11
7.1 Supply by pipeline .11
7.2 Supply by mobile storage .11
8 Dryer .12
9 Compressors .12
9.1 General .12
9.2 Instrumentation and control .13
9.3 Crankcase design .13
9.4 Compressor enclosures, buildings and canopies .14
9.5 Underground compressor installations .16
9.6 Hazardous area classification.16
10 Buffer storage .16
11 Dispensers .17
11.1 General requirements .17
11.2 Breakaway devices .17
11.3 Fuelling hose assemblies .18
11.4 Fuelling hoses .19
11.5 Enclosure .19
11.6 Fuelling controls and instrumentation .20
11.7 Electrical systems and interconnections .22
11.8 Documentation .22
12 Gas odorization .22
13 Pipework .23
13.1 General .23
13.2 Buried piping .23
14 Electrical .24
14.1 Labelling .24
14.2 Contact with live parts.24
14.3 Cables .24
14.4 Performance after power fail and restoration .24
14.5 Electrical bonding and grounding .25
15 Instrumentation and control system .25
15.1 Gas detection .25
15.2 Emergency shutdown devices .25
16 Emergency shutdown .26
16.1 Emergency shutdown procedure .26
© ISO 2016 – All rights reserved iii
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oSIST ISO 16923:2017
ISO 16923:2016(E)
16.2 Restoration after emergency shutdown .26
17 Indoor fuelling .26
17.1 General .26
17.2 Ventilation .26
17.3 Additional requirements .27
18 Testing and commissioning .27
19 Operation .28
19.1 Fuelling procedures .28
19.2 Safety signs .28
19.3 Training .28
19.4 Emergency response plan .29
19.5 Operations manual .29
20 Inspection and maintenance .29
20.1 Inspection and maintenance program.29
20.2 Maintenance and testing frequency of gas detection .30
Annex A (informative) Examples of hazardous zone classification .31
Annex B (normative) Separation distances .38
Annex C (informative) Fuelling procedures .39
Annex D (informative) Emergency instructions example .40
Annex E (informative) Example of fuelling station periodic inspection and maintenance .41
Bibliography .43
iv © ISO 2016 – All rights reserved
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oSIST ISO 16923:2017
ISO 16923:2016(E)
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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/PC 252, Natural gas fuelling stations for vehicles.
© ISO 2016 – All rights reserved v
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oSIST ISO 16923:2017
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oSIST ISO 16923:2017
INTERNATIONAL STANDARD ISO 16923:2016(E)
Natural gas fuelling stations — CNG stations for fuelling
vehicles
1 Scope
This document covers the design, construction, operation, inspection and maintenance of stations for
fuelling compressed natural gas (CNG) to vehicles, including equipment, safety and control devices.
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 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).
This document 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.
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 domestic CNG fuelling devices without buffer storage.
NOTE This document is based on the condition that the gas entering the fuelling station is odorized. For
unodorized gas fuelling stations, additional safety requirements are included in Clause 10.
2 Normative references
The following documents are referred to in 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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 834-1, Fire-resistance tests — Elements of building construction — Part 1: General requirements
ISO 4126-1, Safety devices for protection against excessive pressure — Part 1: Safety valves
ISO 8580, Rubber and plastics hoses — Determination of ultra-violet resistance under static conditions
© ISO 2016 – All rights reserved 1
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oSIST ISO 16923:2017
ISO 16923:2016(E)
ISO 9809-1, Gas cylinders — Refillable seamless steel gas cylinders — Design, construction and testing —
Part 1: Quenched and tempered steel cylinders with tensile strength less than 1 100 MPa
ISO 9809-2, Gas cylinders — Refillable seamless steel gas cylinders — Design, construction and testing —
Part 2: Quenched and tempered steel cylinders with tensile strength greater than or equal to 1 100 MPa
ISO 11119-1, Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and
testing —Part 1: Hoop wrapped fibre reinforced composite gas cylinders and tubes up to 450 l
ISO 11119-2, Gas cylinders — Refillable composite gas cylinders and tubes — Design, construction and
testing — 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 — Refillable composite gas cylinders and tubes — Design, construction and
testing — Part 3: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450L with non-
load-sharing metallic or non-metallic 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
IEC 31010, Risk management — Risk assessment techniques
IEC 60079-0, Electrical apparatus for explosive gas atmospheres — Part 0: General requirements
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 60204-1, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
IEC 60529, Degrees of protection provided by enclosures (IP Code)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2 © ISO 2016 – All rights reserved
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oSIST ISO 16923:2017
ISO 16923:2016(E)
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
assembly
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 ground/earth
3.5
breakaway device
coupling which separates at a predetermined section when required and each separated section
contains a self-closing shut-off valve which seals automatically
[SOURCE: ISO/TS 18683:2015, 3.1.3]
3.6
buffer storage
one or more suitable pressure vessels designed for the purpose of storing compressed natural gas
3.7
building
structures, usually enclosed by walls and a roof, constructed to provide support or shelter for an
intended occupancy
3.8
burst pressure
p
b
pressure that causes failure and consequential fluid loss through the component envelope
3.9
canopy
roof, overhead shelter, or hood, that affords a degree of weather protection
3.10
CNG fuelling station
facility at which compressed natural gas is dispensed to vehicles
3.11
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
© ISO 2016 – All rights reserved 3
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oSIST ISO 16923:2017
ISO 16923:2016(E)
3.12
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]
3.13
compressor
machine that increases the pressure of gas
3.14
conduit
casing, tubing or liner, either metallic or non-metallic
[SOURCE: ISO 14310:2008, 3.6]
3.15
cylinder
pressure vessel used for the storage of compressed natural gas
3.16
cylinder working pressure
settled pressure of a fully filled cylinder at a uniform temperature of 15 °C
3.17
dispenser
equipment through which the fuel is supplied to the vehicle
Note 1 to entry: This equipment can include metering.
3.18
dryer
equipment which decreases the water vapour content (moisture) of natural gas
3.19
enclosure
structure, not being a building or canopy, that encloses a component of the fuelling station
EXAMPLE Housing, container and machine cabinet.
3.20
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]
3.21
fail-safe
design feature that ensures that safe conditions are maintained in the event of a malfunction of a
control device or an interruption of a supply source
3.22
fast fill
3
fuelling operation which has a designed flow rate greater than 100 m (N)/h per nozzle
3.23
field piping
piping installed for interconnection between equipment at the site
4 © ISO 2016 – All rights reserved
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oSIST ISO 16923:2017
ISO 16923:2016(E)
3.24
fire resistant
property that prevents or retards the passage of excessive heat, hot gases or flames under specified
conditions
3.25
fire wall
wall, or separating partition erected to reduce the effects of radiated heat
3.26
fuelling
transfer of fuel from dispenser to the vehicle
3.27
fuelling pressure
pressure at which the fuel is delivered to the vehicle
3.28
fuelling station
facility at which vehicles fuels are dispensed
3.29
grounding
electrical connection of potentially live exposed metallic parts to earth
3.30
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]
3.31
hose
pipeline of flexible material with end fittings attached
3.31.1
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
3.32
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
3.33
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”.]
© ISO 2016 – All rights reserved 5
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oSIST ISO 16923:2017
ISO 16923:2016(E)
3.34
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.
3.35
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
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
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 speci
...
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