Road vehicles -- Dimethyl Ether (DME) fuel system components

This document specifies performance and general test methods for Dimethyl Ether (DME) fuel system components 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 Dimethyl Ether in accordance with ISO 16861 and ASTM D7901. It is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container-mounting hardware; d) electronic fuel management; e) refuelling receptacles.

Véhicules routiers -- Composants des systèmes de combustible Diméthyle Ether (DME)

General Information

Status
Published
Publication Date
09-Dec-2019
Current Stage
6060 - International Standard published
Start Date
08-Nov-2019
Completion Date
10-Dec-2019
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ISO 22760-2:2019 - Road vehicles -- Dimethyl Ether (DME) fuel system components
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INTERNATIONAL ISO
STANDARD 22760-2
First edition
2019-12
Road vehicles — Dimethyl Ether
(DME) fuel system components —
Part 2:
Performance and general test methods
Véhicules routiers — Composants des systèmes de combustible
Diméthyle Ether (DME) —
Partie 2: Performances et méthodes d'essai générales
Reference number
ISO 22760-2:2019(E)
ISO 2019
---------------------- Page: 1 ----------------------
ISO 22760-2:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 22760-2:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

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 ................................................................................................................................................................... 9

17 Insulation resistance ........................................................................................................................................................................................ 9

18 Resistance to dry heat ..................................................................................................................................................................................... 9

19 Creep ..............................................................................................................................................................................................................................10

20 Temperature cycle test ................................................................................................................................................................................10

21 Compatibility with heat exchange fluids of non-metallic parts ........................................................................10

22 Automotive fluid exposure ......................................................................................................................................................................10

22.1 General ........................................................................................................................................................................................................10

22.2 Test method ............................................................................................................................................................................................10

22.3 Fluids ............................................................................................................................................................................................................10

22.4 Pass criteria ............................................................................................................................................................................................11

Bibliography .............................................................................................................................................................................................................................12

© ISO 2019 – All rights reserved iii
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ISO 22760-2:2019(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.
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 2019 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 22760-2:2019(E)
Introduction

For the purposes of this document, all fuel system components in contact with Dimethyl Ether have

been considered suitable for Dimethyl Ether as defined in ISO 16861. However, it is recognized that

miscellaneous components not specifically covered herein can be examined to meet the criteria of this

document and can be tested in accordance with the appropriate functional tests.

All references to pressure in this document are considered to be gauge pressures unless otherwise

specified.

This document is based on a service pressure for Dimethyl Ether used as fuel of 1 500 kPa (15 bar)

settled at 20 °C. Other service pressures can be accommodated by adjusting the pressure by the

appropriate factor (ratio).
© ISO 2019 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 22760-2:2019(E)
Road vehicles — Dimethyl Ether (DME) fuel system
components —
Part 2:
Performance and general test methods
1 Scope

This document specifies performance and general test methods for Dimethyl Ether (DME) fuel system

components 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 Dimethyl

Ether in accordance with ISO 16861 and ASTM D7901. It is not applicable to the following:

a) fuel containers;
b) stationary gas engines;
c) container-mounting hardware;
d) electronic fuel management;
e) 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 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests

ISO 1431-1, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 1: Static and

dynamic strain testing

ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids

ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests

ISO 22760-1:2019, Road vehicles — Dimethyl Ether (DME) fuel system components — Part 1: General

requirements and definitions
ASTM D4814, Standard Specification for Automotive Spark-Ignition Engine Fuel
IEC 68-2-52, Kb: Salt Spray Fog Test
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 22760-1 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
© ISO 2019 – All rights reserved 1
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ISO 22760-2:2019(E)
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

3.3
service pressure
settled pressure of the fluid at 20 °C
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 22760, 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 Dimethyl Ether, provided appropriate safety measures are taken.

4.4 Unless otherwise specified, all pressures shall have a maximum tolerance of ±5 %. Unless otherwise

specified, all temperatures shall have a maximum tolerance of ±5 %. Unless otherwise specified, all

dimensions shall have a maximum tolerance of ±5 %.
5 Hydrostatic strength
5.1 General

A component shall not show any visible evidence of rupture when subjected to the following test

procedure.

a) Plug the outlet opening of the component and have the valve seats or internal blocks assume the

open position.

b) 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.

c) 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 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 2019 – All rights reserved
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ISO 22760-2:2019(E)
6 Leakage
6.1 General

6.1.1 Prior to conditioning, purge the component, then seal it at 30 % of the working pressure using

nitrogen or dry air.

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 (normal)/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 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 2min 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 that are intended to be leak-tight in 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 2min 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.
© ISO 2019 – All rights reserved 3
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ISO 22760-2:2019(E)

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 −40 °C or −20 °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 and then conditioned until

temperature equilibrium is achieved at high temperature of 65 °C, 85 °C or 120 °C, as applicable, and

maintained at that temperature for at least 30 min.
7 Excess torque resistance
A component designed to
...

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