ISO 15500-2:2001
(Main)Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2: Performance and general test methods
Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2: Performance and general test methods
Véhicules routiers — Composants des systèmes de combustible gaz naturel comprimé (GNC) — Partie 2: Performances et méthodes d'essai générales
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 15500-2
First edition
2001-02-15
Road vehicles — Compressed natural gas
(CNG) fuel system components —
Part 2:
Performance and general test methods
Véhicules routiers — Composants des systèmes de combustible gaz
naturel comprimé (GNC) —
Partie 2: Performances et méthodes d'essai générales
Reference number
ISO 15500-2:2001(E)
©
ISO 2001
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ISO 15500-2:2001(E)
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ISO 15500-2:2001(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 3.
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 part of ISO 15500 may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 15500-2 was prepared by Technical Committee ISO/TC 22, Road vehicles,
Subcommittee SC 25, Road vehicles using natural gas.
ISO 15500 consists of the following parts, under the general title Road vehicles — Compressed natural gas (CNG)
fuel system components:
� Part 1: General requirements and definitions
� Part 2: Performance and general test methods
� Part 3: Check valve
� Part 4: Manual valve
� Part 5: Manual cylinder valve
� Part 6: Automatic valve
� Part 7: Gas injector
� Part 8: Pressure indicator
� Part 9: Pressure regulator
� Part 10: Gas-flow adjuster
� Part 11: Gas/air mixer
� Part 12: Pressure relief valve (PRV)
� Part 13: Pressure relief device (PRD)
� Part 14: Excess flow valve
� Part 15: Gas-tight housing and ventilation hose
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ISO 15500-2:2001(E)
� Part 16: Rigid fuel line
� Part 17: Flexible fuel line
� Part 18: Filter
� Part 19: Fittings
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INTERNATIONAL STANDARD ISO 15500-2:2001(E)
Road vehicles — Compressed natural gas (CNG) fuel system
components —
Part 2:
Performance and general test methods
1 Scope
This part of ISO 15500 specifies performance and general test methods for compressed natural gas fuel system
components intended for use on the types of motor vehicles defined in ISO 3833.
This part of ISO 15500 is applicable to vehicles using natural gas in accordance with ISO 15403 (mono-fuel, bi-fuel
or dual-fuel applications). It is not applicable to the following:
a) liquefied natural gas (LNG) fuel system components located upstream of, and including, the vaporizer;
b) fuel containers;
c) stationary gas engines;
d) container mounting hardware;
e) electronic fuel management;
f) refuelling receptacles.
NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria
of this part of ISO 15500 and tested according to the appropriate functional tests
NOTE 2 All references to pressure in this part of ISO 15500 are to be considered gauge pressures unless otherwise
specified.
1)
NOTE 3 This part of ISO 15500 is based upon a service pressure for natural gas as fuel of 20 MPa [200 bar ] settled at
15 °C. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example,
a 25 MPa (250 bar) service pressure system will require pressures to be multiplied by 1,25.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 15500. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 15500 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm
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ISO 15500-2:2001(E)
ISO 188:1998, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests.
ISO 1817, Rubber, vulcanized — Determination of the effect of liquids.
ISO 3833:1977, Road vehicles — Types — Terms and definitions.
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests.
ISO 15403, Natural gas — Designation of the quality of natural gas for use as a compressed fuel for vehicles.
ISO 15500-1:2000, Road vehicles — Compressed natural gas (CNG) fuel system components — General
requirements and definitions.
ISO 15500-3, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 3: Check valve.
ISO 15500 (parts 4 to 19), Road vehicles — Compressed natural gas (CNG) fuel system components.
3 Terms and definitions
For the purposes of this part of ISO 15500, the terms and definitions given in ISO 15500-1 apply.
4 General
4.1 Unless otherwise stated, the tests shall be conducted at room temperature: i.e. 20 °C� 5 °C.
4.2 Components shall comply with the tests specified in ISO 15500-3 and subsequent parts, as well as the
applicable tests specified in this part of ISO 15500. Because of the peculiarities of some components, the list of
tests given in this part of ISO 15500 (clauses 5 to 15) is not exhaustive. Where additional tests are required, their
provisions are given in another, relevant part.
4.3 Unless otherwise specified, all tests shall be conducted using dry air or nitrogen. Qualified personnel may
also test with natural gas provided that appropriate safety measures are taken. The dewpoint of the test gas at the
test pressure shall be at the temperature at which there is no icing, or hydrate or liquid formation.
4.4 It is recognized that new technology may not be covered in ISO 15500-3 or subsequent parts of ISO 15500.
5 Hydrostatic strength
A component shall not rupture when subjected to the following test procedure.
Plug the outlet opening of the component and have the valve seats or internal blocks assume the open position.
Apply, with a test fluid, the hydrostatic pressure specified in ISO 15500-3 and subsequent parts of ISO 15500 to the
inlet of the component for a period of at least 3 min.
The samples used in this test shall not be used for any other testing.
6 Leakage
6.1 General
6.1.1 Prior to conditioning, purge the component or device with nitrogen and then seal it at 30 % of service
pressure using nitrogen, dry air or natural gas.
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ISO 15500-2:2001(E)
6.1.2 Conduct all tests while the device is continuously exposed to the specified test temperatures. The device
3
shall either be bubble-free or have a leakage rate of less than 20 cm /h (normal) using the following test method.
6.2 External leakage
6.2.1 Plug each device outlet with the appropriate mating connection and apply the test pressure to the inlet.
6.2.2 Apply pressurized air, nitrogen, or natural gas to the test device.
6.2.3 At all test temperatures, immerse the components in a suitable test medium for 2 min or use a helium
vacuum test (global accumulation method) or other equivalent method.
6.2.4 If there are no bubbles for the specified time period, the sample passes the test. If bubbles are detected,
measure the leak rate by an appropriate method.
6.3 Internal leakage
6.3.1 The internal leakage test is applicable only to devices having a closed position. The aim of this test is to
check the pressure tightness of the closed system.
6.3.2 Connect the inlet or outlet (as applicable) of the device, with the appropriate mating connection, while
leaving the opposite connection or connections open.
6.4 Test conditions
6.4.1 General
The leakage test conditions depend on whether the component is exposed to cylinder pressure or located
downstream of the first stage of pressure reduction.
6.4.2 Devices exposed to cylinder pressure
6.4.2.1 The device shall be conditioned at a low temperature of � 40 °C, andpressurizedat75% and2,5% of
service pressure.
6.4.2.2 The device shall be conditioned at a room temperature of 20 °C and pressurized at 2,5 % and 150 %
of service pressure.
6.4.2.3 The device shall be conditioned at a high temperature of 85 °C or 120 °C and pressurized at 5 % and
150 % of service pressure.
6.4.3 Devices downstream of t
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