ISO 8789:2018
(Main)Rubber hoses and hose assemblies for liquefied petroleum gas in motor vehicles — Specification
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
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Standards Content (Sample)
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
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ISO 8789:2018(E)
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© ISO 2018
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ii © ISO 2018 – All rights reserved
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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
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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.
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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
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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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