ISO 15500-13:2001
(Main)Road vehicles — Compressed natural gas (CNG) fuel system components — Part 13: Pressure relief device (PRD)
Road vehicles — Compressed natural gas (CNG) fuel system components — Part 13: Pressure relief device (PRD)
Véhicules routiers — Composants des systèmes de combustible gaz naturel comprimé (GNC) — Partie 13: Dispositifs de limitation de pression
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 15500-13
First edition
2001-04-15
Road vehicles — Compressed natural gas
(CNG) fuel system components —
Part 13:
Pressure relief device (PRD)
Véhicules routiers — Composants des systèmes de combustible gaz
naturel comprimé (GNC) —
Partie 13: Dispositifs de limitation de pression
Reference number
ISO 15500-13:2001(E)
©
ISO 2001
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ISO 15500-13:2001(E)
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ii © ISO 2001 – All rights reserved
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ISO 15500-13:2001(E)
Contents Page
Foreword.iv
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Marking .2
5 Construction and assembly.2
6 Tests.3
6.1 Applicability.3
6.2 Hydrostatic strength.3
6.3 Leakage.4
6.4 Bending moment.4
6.5 Continued operation.4
6.6 Accelerated Life .5
6.7 Benchtop activation .6
6.8 Thermal cycling.7
6.9 Condensate corrosion resistance.7
6.10 Flow capacity .7
7 Production batch inspection and acceptance testing .8
Annex A (normative) Determination of fusible material yield temperature and PRD activation
temperature .9
Annex B (informative) PRD trigger temperatures .11
© ISO 2001 – All rights reserved iii
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ISO 15500-13:2001(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 15500-13 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 15500-13:2001(E)
� Part 16: Rigid fuel line
� Part 17: Flexible fuel line
� Part 18: Filter
� Part 19: Fittings
Annex A forms a normative part of this part of ISO 15500. Annex B is for information only.
© ISO 2001 – All rights reserved v
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INTERNATIONAL STANDARD ISO 15500-13:2001(E)
Road vehicles — Compressed natural gas (CNG) fuel system
components —
Part 13:
Pressure relief device (PRD)
1 Scope
This part of ISO 15500 specifies tests and requirements for the pressure relief device (PRD), a compressed natural
gas fuel system component 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 a 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 15500-13:2001(E)
ISO 3833, Road vehicles — Types — Terms and definitions.
ISO 11439, Gas cylinders — High pressure cylinders for the on-board storage of natural gas as a fuel for
automotive vehicles.
ISO 15403, Natural gas — Designation of the quality of natural gas for use as a compressed fuel for vehicles.
ISO 15500-1, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 1: General
requirements and definitions.
ISO 15500-2, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2: Performance
and general test methods.
3 Terms and definitions
For the purposes of this part of ISO 15500, the terms and definitions given in ISO 15500-1 and the following apply.
3.1
combination relief device
PRD activated by a combination of high temperature and pressure acting together
3.2
fusible material
metal, alloy, or other material capable of being melted
3.3
rupture disc
operating part of a PRD which, when installed in the device, is designed to burst at a pre-determined pressure to
permit discharge of the cylinder
3.4
thermally activated relief device
PRD activated by high temperature and generally containing fusible material
3.5
yield temperature
temperature at which the fusible material becomes sufficiently soft to activate the device and to permit discharge of
the cylinder
4 Marking
If a stand-alone component, marking shall provide sufficient information to allow the following to be traced:
a) the manufacturer’s or agent’s name, trademark or symbol;
b) the fusible material yield temperature or PRD activation temperature (see annex A), and the rupture disc
pressure rating, as appropriate.
NOTE This information can be provided by a suitable identification code on at least one part of the component when it
consists of more than one part.
5 Construction and assembly
5.1 The PRD shall comply with the applicable provisions of ISO 15500-1 and ISO 15500-2, and with the tests
specified in clause 6 of this part of ISO 15500.
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ISO 15500-13:2001(E)
5.2 The PRD shall be suitable for the cylinder type and size used. The CNG cylinder and PRD system shall have
been tested according to ISO 11439 to ensure suitability.
6 Tests
6.1 Applicability
The tests required to be carried out are indicated in Table 1.
Table 1 — Tests applicable
Test Applicable Test procedure as Specific test requirements of
required by ISO 15500-2 this part of ISO 15500
Hydrostatic strength X X X (see 6.2)
Leakage X X X (see 6.3)
Excess torque resistance X X
a
Bending moment X X (see 6.4)
X
Continued operation X X X (see 6.5)
Corrosion resistance X X
Oxygen ageing X X
Electrical overvoltages
Non-metallic synthetic immersion X X
Vibration resistance X X
Brass material compatibility X X
Accelerated life X X (see 6.6)
Benchtop activation X X (see 6.7)
Thermal cycling X X (see 6.8)
Condensate corrosion resistance X X (see 6.9)
Flow capacity X X (see 6.10)
a
This test is to confirm proper design and construction of stand-alone, externally threaded PRD designs and is not required
if the PRD is internally imbedded in the valve body.
6.2 Hydrostatic strength
6.2.1 Housing
The manufacturer shall either physically test the housing or prove its strength by calculation. The test shall be
performed according to the procedure given in IS
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