ISO 15501-1:2012
(Main)Road vehicles — Compressed natural gas (CNG) fuel systems — Part 1: Safety requirements
Road vehicles — Compressed natural gas (CNG) fuel systems — Part 1: Safety requirements
Véhicules routiers — Systèmes d'alimentation en gaz naturel comprimé (GNC) — Partie 1: Exigences de sécurité
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 15501-1
Second edition
2012-04-01
Road vehicles — Compressed natural
gas (CNG) fuel systems —
Part 1:
Safety requirements
Véhicules routiers — Systèmes d’alimentation en gaz naturel
comprimé (GNC) —
Partie 1: Exigences de sécurité
Reference number
ISO 15501-1:2012(E)
©
ISO 2012
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ISO 15501-1:2012(E)
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ii © ISO 2012 – All rights reserved
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ISO 15501-1:2012(E)
Contents Page
Foreword .iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 3
4.1 Design . 3
4.2 Refuelling connection . 5
4.3 Leakage control . 5
4.4 Mounting of the cylinder(s) . 5
4.5 Heat protection . 6
4.6 Minimizing risk of gas ignition . 6
4.7 Venting system . 6
5 Instructions for use . 7
6 Marking . 7
Annex A (informative) Technical solutions to functional requirements . 8
Annex B (informative) Examples of compressed natural gas (CNG) on-board fuel systems . 9
Bibliography . 11
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ISO 15501-1:2012(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 15501-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 25, Vehicles
using gaseous fuels.
This second edition cancels and replaces the first edition (ISO 15501-1:2001), which has been technically revised.
ISO 15501 consists of the following parts, under the general title Road vehicles — Compressed natural gas
(CNG) fuel systems:
— Part 1: Safety requirements
— Part 2: Test methods
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ISO 15501-1:2012(E)
Introduction
For the purposes of this part of ISO 15501, all fuel system components in contact with natural gas have been
considered suitable for natural gas as defined in ISO 15403.
When applying this part of ISO 15501, it is to be understood that a safety device that prevents overfilling of the
vehicle’s fuel system is part of the refuelling station. The pressure gauge is not considered a safety component.
Where necessary, technical solutions to functional requirements are given in Annex A.
1) 2)
This part of ISO 15501 makes reference to a service pressure of 20 MPa [200 bar ] for natural gas used as
fuel, settled at 15 °C. It is possible to accommodate other service pressures by adjusting the pressure using
the appropriate factor (ratio). For example, a 25 MPa (250 bar) service pressure system will require pressures
to be multiplied by 1,25.
2
1) 1 MPa = 1 N/mm .
5
2) 1 bar = 0,1 MPa = 10 Pa.
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INTERNATIONAL STANDARD ISO 15501-1:2012(E)
Road vehicles — Compressed natural gas (CNG) fuel systems —
Part 1:
Safety requirements
1 Scope
This part of ISO 15501 specifies the minimum safety requirements applicable to compressed natural gas
(CNG) on-board fuel systems intended for use on the types of motor vehicles defined in ISO 3833. This part of
ISO 15501 is applicable to vehicles using compressed natural gas as defined in ISO 15403, including bi-fuel,
original-production and converted vehicles.
Matters relating to the skills of installers and converters are outside the scope of this part of ISO 15501.
2 Normative references
The following referenced documents are indispensable for the application 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 1176, Road vehicles — Masses — Vocabulary and codes
ISO 11439, Gas cylinders — High pressure cylinders for the on-board storage of natural gas as a fuel for
automotive vehicles
ISO 14469-1, Road vehicles — Compressed natural gas (CNG) refuelling connector — Part 1: 20 MPa
(200 bar) connector
ISO 14469-2, Road vehicles — Compressed natural gas (CNG) refuelling connector — Part 2: 20 MPa
(200 bar) connector, size 2
ISO 14469-3, Road vehicles — Compressed natural gas (CNG) refuelling connector — Part 3: 25 MPa
(250 bar) connector
ISO 15500 (all parts), Road vehicles — Compressed natural gas (CNG) fuel system components
ISO 15501-2, Road vehicles — Compressed natural gas (CNG) fuel systems — Part 2: Test methods
IEC 60079-10-1, Explosive atmospheres — Part 10-1: Classification of areas — Explosive gas atmospheres
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15500-1, ISO 1176, and the following apply.
3.1
service pressure
settled pressure of vehicle fuel system at a uniform natural gas temperature of 15 °C
3.2
CNG on-board fuel system
compressed natural gas fuel system comprising a cylinder, or cylinders, mounting hardware, a refuelling
receptacle or more than one of each of these, in accordance with ISO 14469, and the components described
in ISO 15500-3 to ISO 15500-20
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ISO 15501-1:2012(E)
3.3
main shut-off valve
automatic valve designed to isolate a high-pressure source
3.4. Vehicle mass
3.4.1
kerb mass
complete shipping mass of a vehicle fitted with all equipment necessary for normal operation plus the mass of the
following elements for categories M1, N1 and M2 whose maximum authorized mass does not exceed 3 500 kg:
— lubricants, coolant (if needed), washer fluid;
— fuel (tank filled to at least 90 % of the capacity specified by the manufacturer);
— other equipment if included as basic parts for the vehicle, such as spare wheel(s), wheel chocks, fire
extinguisher(s), spare parts and tool kit
NOTE The definition of kerb mass can vary from country to country, but in this part of ISO 15501, it refers to the
definition given in ISO 1176.
3.4.2
maximum authorized mass
kerb mass plus the maximum allowable payload
3.5 Vehicle categories
3.5.1
category M
power-driven vehicles having at least four wheels and used for the carriage of passengers
3.5.1.1
category M1
vehicles used for the carriage of passengers and comprising no more than eight seats in addition to the driver’s seat
3.5.1.2
category M2
vehicles used for the carriage of passengers, comprising more than eight seats in addition to the driver’s seat
and having a maximum authorized mass not exceeding 5 000 kg
3.5.1.3
category M3
vehicles used for the carriage of passengers, comprising more than eight seats in addition to the driver’s seat
and having a maximum authorized mass exceeding 5 000 kg
3.5.2
category N
power-driven vehicles having at least four wheels and used for the carriage of goods
3.5.2.1
category N1
vehicles used for the carriage of goods and having a maximum authorized mass not exceeding 3 500 kg
3.5.2.2
category N2
vehicles used for the carriage of goods and having a maximum authorized mass exceeding 3 500 kg but not
exceeding 12 000 kg
3.5.2.3
category N3
vehicles used for the carriage of goods and having a maximum authorized mass exceeding 12 000 kg
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ISO 15501-1:2012(E)
4 Requirements
4.1 Design
4.1.1 General
4.1.1.1 The CNG on-board fuel system components shall comply with ISO 11439, ISO 14469 and ISO 15500,
as applicable.
4.1.1.2 For bi-fuel vehicles, provision shall be made to avoid accelerated deterioration of the non-CNG fuel
system as a result of sustained operation on natural gas. Such measures shall be as recommended by the
original vehicle manufacturer (with regard to fuel hoses for example).
4.1.1.3 All fuel system components shall fulfil the following conditions.
a) They shall withstand the environmental temperatures and other environmental conditions safely during
their operational life.
b) They shall be located with full regard for anticipated damage liable to occur while the vehicle is being
used safely.
NOTE Such damage can be caused by the vehicle itself, by extraneous factors such as heat, road debris,
automotive chemical splash (brake liquid, oil, petrol, cooling liquid, etc.), or by rust, etc.
c) They shall be fitted so that they are not the outermost, highest or lowest parts of the vehicle; otherwise they
shall be protected.
d) They shall be fitted so as not to affect the ground clearance, approach angle, ramp (break-over) angle or
departure angles defined by the vehicle manufacturer.
e) They shall be located so as not to suffer corrosion damage through accumulation of water or cargo chemicals.
f) They shall ensure proper electrical conductivity throughout the fuel system in order to avoid electrostatic
charges. This provision does not apply to gas-tight housing and ventilation hoses.
4.1.1.4 The CNG system [including the gas cylinder valve(s), pressure-relief device(s) (PRDs) and one or
more automatic valves designed to close when the engine is not running on CNG and to
...
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