ISO 8789:2020
(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
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
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ISO 8789:2020(E)
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© ISO 2020
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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.
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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/
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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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