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
Replaced
Publication Date
02-Aug-2018
Withdrawal Date
02-Aug-2018
Current Stage
6060 - International Standard published
Start Date
05-Jul-2018
Completion Date
03-Aug-2018
Ref Project

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ISO 8789:2018 - Rubber hoses and hose assemblies for liquefied petroleum gas in motor vehicles -- Specification
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INTERNATIONAL ISO
STANDARD 8789
Third edition
2018-08
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 8789:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 8789:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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.
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Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 8789:2018(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 ............................................................................................................................................................................................ 3

6.1 Rubber compounds ............................................................................................................................................................................. 3

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

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

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

7.3 Finished hose and hose assemblies ...................................................................................................................................... 4

8 Requirements for fittings ............................................................................................................................................................................ 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 Type tests ..................................................................................................................................................................................................................... 5

12 Marking .......................................................................................................................................................................................................................... 5

Annex A (normative) Type and routine testing of production hoses and hose assemblies ........................6

Annex B (informative) Periodic testing of production hoses and hose assemblies .............................................7

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

lengths of hose assemblies ......................................................................................................................................................................... 8

© ISO 2018 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 8789:2018(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 on 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 the following

URL: 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 third edition cancels and replaces the second edition (ISO 8789:2009), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— normative references have been updated;
— requirement on physical properties of finished products has been added;
— minimum bend radii has been introduced;
— new clauses on frequency of testing and type tests have been added.
iv © ISO 2018 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 8789:2018(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 2018 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 8789:2018(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 .electroped
...

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