Rubber hoses and hose assemblies for liquefied petroleum gas in motor vehicles -- Specification

This document specifies the requirements for rubber hoses and hose assemblies, up to a maximum hose size of 19, for use in motor vehicles with liquefied petroleum gas (LPG) installations. The hoses are designed for use up to a maximum working pressure of 3,0 MPa (30 bar) and at working temperatures from −40 °C up to and including +80 °C.

Tuyaux et flexibles en caoutchouc pour circulation de gaz de pétrole liquéfié dans les véhicules à moteur -- Spécifications

General Information

Status
Published
Publication Date
07-Jan-2020
Current Stage
6060 - International Standard published
Start Date
02-Dec-2019
Completion Date
08-Jan-2020
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ISO 8789:2020 - Rubber hoses and hose assemblies for liquefied petroleum gas in motor vehicles -- Specification
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INTERNATIONAL ISO
STANDARD 8789
Fourth edition
2020-01
Rubber hoses and hose assemblies
for liquefied petroleum gas in motor
vehicles — Specification
Tuyaux et flexibles en caoutchouc pour circulation de gaz de pétrole
liquéfié dans les véhicules à moteur — Spécifications
Reference number
ISO 8789:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 8789:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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

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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2020 – All rights reserved
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ISO 8789:2020(E)
Contents Page

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

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

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

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

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

4 Materials and construction ....................................................................................................................................................................... 2

4.1 Materials ....................................................................................................................................................................................................... 2

4.2 Construction .............................................................................................................................................................................................. 2

5 Dimensions and tolerance .......................................................................................................................................................................... 2

5.1 Inside diameter ....................................................................................................................................................................................... 2

5.2 Minimum bending radii ................................................................................................................................................................... 2

5.3 Concentricity............................................................................................................................................................................................. 2

5.4 Length ............................................................................................................................................................................................................. 3

6 Physical properties of rubber compounds ................................................................................................................................ 3

7 Performance requirements ....................................................................................................................................................................... 3

7.1 General ........................................................................................................................................................................................................... 3

7.2 Visual examination .............................................................................................................................................................................. 3

7.3 Finished hose and hose assemblies ...................................................................................................................................... 3

8 Requirements for fittings ............................................................................................................................................................................ 4

8.1 Fitting material ....................................................................................................................................................................................... 4

8.2 Fitting description ................................................................................................................................................................................ 4

9 Requirements for hose assemblies ................................................................................................................................................... 4

9.1 Leakage test ............................................................................................................................................................................................... 4

9.2 Minimum burst pressure, proof pressure and permeability to propane .............................................. 4

9.3 Visual examination .............................................................................................................................................................................. 4

10 Frequency of testing .......................................................................................................................................................................................... 5

11 Marking .......................................................................................................................................................................................................................... 5

11.1 Hose marking ........................................................................................................................................................................................... 5

11.2 Hose assembly marking .................................................................................................................................................................. 5

Annex A (normative) Test frequency for type tests and routine tests ............................................................................... 7

Annex B (informative) Production acceptance tests ............................................................................................................................ 8

Annex C (informative) Recommendations for lengths of supplied hoses and tolerances on

lengths of hose assemblies ......................................................................................................................................................................... 9

© ISO 2020 – All rights reserved iii
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ISO 8789:2020(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 ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Rubber

and plastics hoses and hose assemblies.

This fourth edition cancels and replaces the third edition (ISO 8789:2018), which has been technically

revised. The main changes compared to the previous edition are as follows:
— in Table 2, "70 ± 1" for both lining and cover has been changed to "80 ± 1";
— in 8.2, “45° cone” has been changed to “45° flare";
— Clause 10 has been upgraded to the latest agreed upon verbiage;
— 11.1 and 11.2 have been upgraded to the latest agreed upon verbiage;
— Annexes A and B have been upgraded to the latest agreed upon verbiage.

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 2020 – All rights reserved
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ISO 8789:2020(E)
Introduction

This document has been developed to harmonize international requirements for LPG hoses and hose

assemblies used in motor vehicles, for instance United Nations Regulation No. 67.

© ISO 2020 – All rights reserved v
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INTERNATIONAL STANDARD ISO 8789:2020(E)
Rubber hoses and hose assemblies for liquefied petroleum
gas in motor vehicles — Specification
1 Scope

This document specifies the requirements for rubber hoses and hose assemblies, up to a maximum hose

size of 19, for use in motor vehicles with liquefied petroleum gas (LPG) installations. The hoses are

designed for use up to a maximum working pressure of 3,0 MPa (30 bar) and at working temperatures

from −40 °C up to and including +80 °C.
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 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties

ISO 68-1, ISO general purpose screw threads — Basic profile — Part 1: Metric screw threads

ISO 188:2011, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests

ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing

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

ISO 4080:2009, Rubber and plastics hoses and hose assemblies — Determination of permeability to gas

ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions of

hoses and the lengths of hose assemblies

ISO 7326:2016, Rubber and plastics hoses — Assessment of ozone resistance under static conditions

ISO 8033, Rubber and plastics hoses — Determination of adhesion between components

ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary

ISO 10619-2, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 2:

Bending tests at sub-ambient temperatures

ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods

ASME B1.1, Unified Inch Screw Threads (UN and UNR Thread Form)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 8330 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 https:// www .electropedia .org/
© ISO 2020 – All rights reserved 1
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ISO 8789:2020(E)
4 Materials and construction
4.1 Materials
The hose shall consist of:

a) a smooth-bore rubber lining-resistant rubber suitable for liquefied petroleum gas;

b) a reinforcement of natural textile, synthetic textile or corrosion-resistant meta

...

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