ISO 15500-13:2023
(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)
This document specifies tests and requirements for the pressure relief device (PRD), a compressed natural gas (CNG) fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using natural gas in accordance with ISO 15403-1. 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.
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
Third edition
2023-02
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 15500-13:2023(E)
© ISO 2023
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ISO 15500-13:2023(E)
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ISO 15500-13:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking . . 3
5 Construction and assembly .3
6 Tests . 4
6.1 Applicability . 4
6.2 Hydrostatic strength . 4
6.2.1 Housing . 4
6.2.2 Fusible material. 5
6.3 Leakage . 5
6.4 Bending moment . 5
6.5 Continued operation . 6
6.5.1 Test procedure. 6
6.5.2 Requirements . 6
6.6 Accelerated life . 6
6.6.1 General . 6
6.6.2 Test procedure. 6
6.6.3 Accelerated-life test temperature . 6
6.6.4 Requirements . 7
6.7 Benchtop activation . 7
6.7.1 General . 7
6.7.2 Thermally-activated relief devices . 7
6.7.3 Series-combination relief devices . 7
6.7.4 Parallel-combination relief devices . 8
6.8 Thermal cycling . 8
6.8.1 Test procedure. 8
6.8.2 Requirements . 8
6.9 Condensate-corrosion resistance . 9
6.9.1 Test procedure. 9
6.9.2 Test solution . 9
6.10 Flow capacity . 9
6.10.1 General . 9
6.10.2 Test procedure. 9
6.11 High-pressure activation and flow rate . 10
6.11.1 General . 10
6.11.2 Test setup . 10
6.11.3 Test procedure. 10
6.11.4 Acceptable results . 10
6.11.5 Data analysis and availability . 10
6.12 Water jet protection . 10
6.12.1 General . 10
6.12.2 Method of test . 10
6.12.3 Acceptance criteria . 10
6.13 Impact due to drop . 11
7 Production batch inspection and acceptance testing .11
Annex A (normative) Determination of fusible material yieldtemperature and PRD
activation temperature . .12
Bibliography .14
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ISO 15500-13:2023(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 of the voluntary nature of standards, 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
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 41,
Specific aspects for gaseous fuels.
This third edition cancels and replaces the second edition (ISO 15500-13:2012), which has been
technically revised. It also incorporates the Amendment ISO 15500-13:2012/Amd.1:2016.
The main changes are as follows:
— Clause 4, the type of gas and service pressure value have been added;
— Clause 6, new tests for "high-pressure activation and flow rate", "water jet protection" and "impact
due to drop" have been added.
A list of all parts in the ISO 15500 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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ISO 15500-13:2023(E)
Introduction
For the purposes of this document, all fuel system components in contact with natural gas have
been considered suitable for natural gas as defined in ISO 15403-1. However, it is recognized that
miscellaneous components not specifically covered herein can be examined to meet the criteria of this
document and tested according to the appropriate functional tests.
All references to pressure in this document are considered to be gauge pressures unless otherwise
specified.
1)
This document 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 accommodated by adjusting the pressure by the appropriate
factor (ratio). For example, a 25 MPa (250 bar) service pressure system requires that pressures 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 15500-13:2023(E)
Road vehicles — Compressed natural gas (CNG) fuel system
components —
Part 13:
Pressure relief device (PRD)
1 Scope
This document specifies tests and requirements for the pressure relief device (PRD), a compressed
natural gas (CNG) fuel system component intended for use on the types of motor vehicles defined in
ISO 3833.
This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using natural gas
in accordance with ISO 15403-1.
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 documents are referred to in the 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 15403-1, Natural gas — Natural gas for use as a compressed fuel for vehicles — Part 1: Designation of
the quality
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
ISO 20653, Road vehicles — Degrees of protection (IP code) — Protection of electrical equipment against
foreign objects, water and access
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15500-1 and the following
apply.
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ISO 15500-13:2023(E)
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
activation pressure
rupture disc pressure rating
pressure, as specified by the pressure relief device (PRD) manufacturer, at which a PRD is designed to
activate in order to allow the discharge of the cylinder
3.2
activation temperature
temperature, as specified by the pressure relief device (PRD) manufacturer, at which a PRD is designed
to activate in order to allow the discharge of the cylinder
3.3
fusible material
metal, alloy or other material capable of being melted where the melting is integral to the function of
the pressure relief device (PRD)
3.4
parallel-combination relief device
pressure relief device (PRD) activated by high temperature or pressure acting separately
Note 1 to entry: This device may be integrated into one device that has independent pressure-activated and
thermally-activated parts. It may also be formed by two independent devices (one pressure-activated and one
thermally-activated) that act independently.
3.5
pressure-activated relief device
pressure relief device (PRD) activated by pressure
3.6
burst disc
rupture disc
operating part of a pressure-activated relief device (3.5) which, when installed in the device, is designed
to burst at a predetermined pressure to permit discharge of the cylinder
3.7
series-combination relief device
pressure relief device (PRD) activated by a combination of high temperature and pressure acting
together
3.8
thermally-activated relief device
pressure relief device (PRD) activated by high temperature
3.9
yield temperature
temperature at which the fusible material (3.3) becomes sufficiently soft to activate the device and to
permit discharge of the cylinder
Note 1 to entry: There are several possible scenarios for a vehicle involved in a fire. The pressure relief device
(PRD) is intended to reduce the risk of cylinder rupture under most of these scenarios while keeping a low risk
of accidental activation. Experience shows that the best solution depends on the type of cylinder the PRD is
mounted on.
3.10
flow capacity
capacity in volume per unit time at specified conditions, for a pressure relief device (PRD)
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ISO 15500-13:2023(E)
3.11
long trigger PRD
pressure relief device (PRD) having a heat reactive element (portion of a PRD that reacts to heat to
activate the PRD) that is more than 10 times longer than the longest dimension of the PRD body
3.12
remote trigger PRD
pressure relief device (PRD) having the heat reactive element (portion of a PRD that reacts to heat to
activate the PRD) that is separate from the gas handling portion of the PRD, such that it is possible for
the heat reactive element to be heated separately from the main body or gas control portion of the PRD
3.13
K
v
valve flow coefficient
3
number equal to the flow rate in cubic meters per hour [m /h] of water at a temperature of 16 °C with a
pressure drop across the valve of 0,1 MPa
4 Marking
If the PRD is 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 type of gas (CNG);
c) the service pressure;
d) the fusible material yield temperature or PRD activation temperature (as per Annex A), and the
rupture disc pressure rating or activation pressure, as appropriate;
e) the type of relief device (e.g. thermally-activated, series-combination, parallel-combination).
If there is a possibility that the PRD could be installed with the flow in the wrong direction, the PRD
shall be marked with an arrow to show the direction of flow.
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
The PRD shall conform to the applicable provisions of ISO 15500-1 and ISO 15500-2, and with the tests
specified in Clause 6. Tolerances should follow the specifications of ISO 15500-2.
Each part of the device shall not interfere with the operation/activation of the other part. The device
shall be able to vent the content of the cylinder through any one of the parts of the PRD independently.
The device shall be able to vent the content of the cylinder if the pressure- and thermally-activated
parts open simultaneously.
The suggested configuration for PRDs is a parallel-combination or thermally-activated relief device for
every type of cylinder. Series PRDs may only be used in type 1 steel cylinders and shall not be used in
type 2, type 3 and type 4 cylinders.
PRDs designed to conform to this document shall be used with natural gas that conforms to the natural
gas specifications from ISO 15403-1.
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ISO 15500-13:2023(E)
6 Tests
6.1 Applicability
The tests required to be carried out are indicated in Table 1.
Table 1 — Applicable tests
Test procedure as Specific te
...
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