ISO 20766-2:2018

Road vehicles — Liquefied petroleum gas (LPG) fuel systems components — Part 2: Performance and general test methods

This document specifies performance and general test methods of liquefied petroleum gas fuel system components, intended for use on the types of motor vehicles as defined in ISO 3833. This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using liquefied petroleum gas in accordance with ISO 9162. It is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; and e) refuelling receptacles. NOTE 1 It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of ISO 20766, including testing to the appropriate functional tests. NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise specified. NOTE 3 This document applies to devices which have a service pressure in the range of 110 kPa (Butane rich at 20 °C) and 840 kPa (Propane rich at 20 °C), hereinafter referred to in this document. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).

Véhicules routiers — Équipements pour véhicules utilisant le gaz de pétrole liquéfié (GPL) comme combustible — Partie 2: Performances et méthodes d'essai générales

General Information

• Status: Published
• Publication Date: 25-Nov-2018
• ICS: 43.060.40 - Fuel systems
• Technical Committee: ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
• Drafting Committee: ISO/TC 22/SC 41/WG 6 - Fuel system components and refuelling connector for vehicles propelled by Liquefied Petroleum Gas (LPG)
• Current Stage: 9093 - International Standard confirmed
• Start Date: 22-Apr-2024
• Completion Date: 13-Dec-2025

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 20766-2
First edition
2018-11
Road vehicles — Liquefied petroleum
gas (LPG) fuel systems components —
Part 2:
Performance and general test methods
Véhicules routiers — Équipements pour véhicules utilisant le gaz de
pétrole liquéfié (GPL) comme combustible —
Partie 2: Performances et méthodes d'essai générales
Reference number
©
ISO 2018
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 General . 2
5 Hydrostatic strength . 2
5.1 General . 2
6 Leakage. 3
6.1 General . 3
6.2 External leakage . 3
6.3 Internal leakage . 3
6.4 Test conditions . 3
7 Excess torque resistance . 4
8 Bending moment . 4
9 Continued operation. 5
9.1 General . 5
9.2 Test methods . 5
9.2.1 Test procedure . 5
9.2.2 Room temperature cycling . 6
9.2.3 High-temperature cycling . 6
9.2.4 Low-temperature cycling . 6
10 Corrosion resistance . 6
11 Oxygen ageing . 7
12 Ozone ageing . 7
13 Electrical overvoltages . 7
14 Non-metallic material immersion . 7
15 Vibration resistance . 8
16 Brass material compatibility . 8
17 Insulation resistance . 9
18 Resistance to dry-heat . 9
19 Creep . 9
20 Temperature cycle test . 9
21 Compatibility with heat exchange fluids of non-metallic parts .10
22 Automotive fluids exposure .10
22.1 General .10
22.2 Test method .10
22.3 Fluids .10
22.4 Pass criteria .10
Bibliography .11
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
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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
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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).
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URL: www .iso .org/iso/foreword .html
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 41,
Specific aspects of gaseous fuels.
A list of all parts in the ISO 20766 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.
iv © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 20766-2:2018(E)
Road vehicles — Liquefied petroleum gas (LPG) fuel
systems components —
Part 2:
Performance and general test methods
1 Scope
This document specifies performance and general test methods of liquefied petroleum gas fuel system
components, intended for use on the types of motor vehicles as defined in ISO 3833.
This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using liquefied
petroleum gas in accordance with ISO 9162. It is not applicable to the following:
a) fuel containers;
b) stationary gas engines;
c) container mounting hardware;
d) electronic fuel management; and
e) refuelling receptacles.
NOTE 1 It is recognized that miscellaneous components not specifically addressed herein can be examined
for compliance with the criteria of any applicable part of ISO 20766, including testing to the appropriate
functional tests.
NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise
specified.
NOTE 3 This document applies to devices which have a service pressure in the range of 110 kPa (Butane rich
at 20 °C) and 840 kPa (Propane rich at 20 °C), hereinafter referred to in this document. Other service pressures
can be accommodated by adjusting the pressure by the appropriate factor (ratio).
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 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
1)
ISO 20766 (all parts) , Road vehicles — liquefied petroleum gas (LPG) fuel system components
IEC 60068-2-52, Environmental testing — Part 2: Tests — Test Kb: Salt mist, cyclic (sodium, chloride
solution)
ISO 1431-1, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 1: Static and
dynamic strain testing
1) Under preparation.
ASTM D4814, Standard specification for automotive spark-ignition engine fuel
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 20766-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at https: //www .iso .org/obp
3.1
fill cycle
sequence of events performed on a filling system that has a defined beginning and ending
3.2
duty cycle
sequence of events performed on a component that has a defined beginning and ending
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 document as well as the relevant parts of
ISO 20766, as applicable for each component.
NOTE Because of the peculiarities of some components, the list of tests given in this document,
(Clauses 5 to 15) is not exhaustive. Where additional tests are required, their provisions are given in other parts
of ISO 20766.
4.3 Unless otherwise specified, all tests shall be conducted using dry air or nitrogen. Tests may also be
conducted with liquefied petroleum gas provided appropriate safety measures are taken.
5 Hydrostatic strength
5.1 General
A component shall not show any visible evidence of rupture when subjected to the following test
procedure.
5.1.1 Plug the outlet opening of the component and have the valve seats or internal blocks assume the
open position.
5.1.2 Apply, with a test fluid, the hydrostatic pressure specified in the applicable part of ISO 20766 to
the inlet of the component for a period of at least 3 min.
5.1.3 The hydrostatic pressure shall then be increased at a rate of less than or equal to 1,4 kPa/s until
component failure. The hydrostatic pressure at failure shall be recorded. The benchmark value for a
specific component shall be determined by testing a component that has not undergone previous testing.
Previously untested sample shall withstand at least 2,25 times working pressure. Hydrostatic testing of
components that have been subjected to previous testing shall result in an acceptable failure pressure
that is at least 80 % of the benchmark value or at least 2,25 times the working pressure of the component.
The samples used in this test shall not be used for any other testing.
2 © ISO 2018 – All rights reserved

6 Leakage
6.1 General
6.1.1 Prior to conditioning, purge the component, then seal it at 30 % of the working pressure using
dry air or nitrogen.
6.1.2 Conduct all tests while the device is continuously exposed to the specified test temperatures.
The device shall either be bubble-free or display a leakage rate of less than 15 cm /h (normal) 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 dry air or nitrogen 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 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.
6.3.3 Apply the test pressure to the inlet or outlet (as applicable) of the device using dry air or nitrogen
as the test fluid.
6.3.4 At all applicable test temperatures mentioned in 6.4, immerse the component in a suitable test
+30
medium for 2 min s or use any other equivalent method.
( )
6.3.5 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.
6.4 Test conditions
6.4.1 The device shall be pressurized at 150 % of the working pressure and then conditioned until
temperature equilibrium is achieved at room temperature, as applicable, and maintained at that
temperature for at least 30 min.
6.4.2 The device shall be pressurized at 150 % of the working pressure and then conditioned until
temperature equilibrium is achieved at a low temperature of −20 °C or −40 °C, as applicable, and
maintained at that temperature for at least 30 min.
6.4.3 The device shall be pressurized at 150 % of the working pressure a
...