ISO 15500-2:2012
(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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INTERNATIONAL ISO
STANDARD 15500-2
Second edition
2012-04-15
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 15500-2:2012(E)
©
ISO 2012
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ISO 15500-2:2012(E)
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ISO 15500-2:2012(E)
Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General . 1
5 Hydrostatic strength . 2
6 Leakage . 2
6.1 General . 2
6.2 External leakage . 2
6.3 Internal leakage . 2
6.4 Test conditions . 3
7 Excess torque resistance . 3
8 Bending moment . 3
9 Continued operation . 4
9.1 General . 4
9.2 Test methods . 5
10 Corrosion resistance . 5
11 Oxygen ageing . 6
12 Electrical overvoltages . 6
13 Non-metallic material immersion . 6
14 Vibration resistance . 7
15 Brass material compatibility . 7
Bibliography . 8
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ISO 15500-2:2012(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 15500-2 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 15500-2:2001), which has been technically revised.
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
— Part 16: Rigid fuel line in stainless steel
— Part 17: Flexible fuel line
— Part 18: Filter
— Part 19: Fittings
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ISO 15500-2:2012(E)
— Part 20: Rigid fuel line in material other than stainless steel
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ISO 15500-2:2012(E)
Introduction
For the purposes of this part of ISO 15500, all fuel system components in contact with natural gas have been
considered suitable for natural gas as defined in ISO 15403. However, it is recognized that miscellaneous
components not specifically covered herein can be examined to meet the criteria of this part of ISO 15500 and
can be tested in accordance with the appropriate functional tests.
All references to pressure in this part of ISO 15500 are considered to be gauge pressures unless otherwise specified.
1)
This part of ISO 15500 is based on a service pressure for natural gas used as fuel of 20 MPa [200 bar ], settled
at 15 °C. Other service pressures can be accomodated 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.
5 2.
1) 1 bar = 0,1 MPa = 10 Pa 1 MPa = 1 N/mm
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INTERNATIONAL STANDARD ISO 15500-2:2012(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 (CNG) 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 (mono-fuel, bi-fuel or dual-fuel applications) using compressed
natural gas in accordance with ISO 15403. 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.
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 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
ISO 15500-1:2000, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 1:
General requirements and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15500-1 apply.
4 General
4.1 Unless otherwise stated, the tests shall be conducted at a room temperature of 20 °C ± 5 °C.
4.2 Components shall comply with the tests specified in this part of ISO 15500 as well as the relevant parts
of ISO 15500, as applicable for each component.
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ISO 15500-2:2012(E)
NOTE 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 other parts of ISO 15500.
4.3 Unless otherwise specified, all tests shall be conducted using dry air or nitrogen. Tests may also be
conducted with natural gas provided appropriate safety measures are taken. The dew point of the test gas at
the test pressure shall be at the temperature at which there is no icing, or hydrate or liquid formation.
5 Hydrostatic strength
A component shall not show any visible evidence of 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 the applicable part of ISO 15500 to the inlet of the
component for a period of at least 3 min.
The hydrostatic pressure shall then be increased at a rate of less than or equal to 1,4 MPa/s until component
failure. The hydrostatic pressure at failure shall be recorded. The failure pressure of previously tested
components shall be no less than 80 % of the failure pressure of the virgin component.
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 with nitrogen, then seal it at 30 % of the working pressure
using nitrogen, dry air or natural gas.
6.1.2 Conduct all tests while the device is continuously exposed to the specified test temperatures. The
3
device shall either be bubble-free or display a leakage rate of less than 20 Ncm /h when subjected to the
following test method.
If components are subjected to more than one working pressure, the test may be conducted in subsequent steps.
6.2 External leakage
6.2.1 Plug each device outlet into the appropriate mating connection.
6.2.2 Apply pressurized air, nitrogen or natural gas to the inlet of the test device.
+30
6.2.3 At all test temperatures, immerse the components in a suitable test medium for 2 min s or use a
()
0
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 leakage rate using an appropriate method; the leakage rate should not be more than
that specified in 6.1.2.
6.3 Internal leakage
6.3.1 The internal leakage test is applicable only to devices in the 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 to the appropriate mating connection, leaving the
opposite connection(s) open.
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ISO 15500-2:2012(E)
6.3.3 Apply the test pressure to the inlet or outlet (as applicable) of the device using air, nitrogen or natural
gas as the test fluid.
6.3.4 At all applicable test temperatures mentioned
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