ISO 12614-20:2023
(Main)Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 20: Flexible fuel or vent lines
Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 20: Flexible fuel or vent lines
This document specifies tests and requirements for the flexible fuel lines, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise specified. NOTE 3 This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa (16 bar). (1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.) Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25.
Véhicules routiers — Équipements pour véhicules utilisant le gaz naturel liquéfié (GNL) comme combustible — Partie 20: Conduites de carburant ou d'aération flexibles
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 12614-20
First edition
2023-08
Road vehicles — Liquefied natural gas
(LNG) fuel system components —
Part 20:
Flexible fuel or vent lines
Véhicules routiers — Équipements pour véhicules utilisant le gaz
naturel liquéfié (GNL) comme combustible —
Partie 20: Conduites de carburant ou d'aération flexibles
Reference number
ISO 12614-20:2023(E)
© ISO 2023
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ISO 12614-20:2023(E)
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ISO 12614-20:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking . . 2
5 Construction and assembly – Hose assembly . 2
6 Construction and assembly – General . 4
6.1 Materials . 4
6.2 Joining . 4
6.3 Fittings . 5
6.4 Cleaning . 5
6.5 Installation instructions . 5
6.6 Packaging . 6
6.7 Hose assembly type . 6
7 Tests . 6
7.1 Applicability . 6
7.2 Hydrostatic strength . 7
7.3 Continued operation . 7
7.3.1 General . 7
7.3.2 Method of test . 7
7.4 Vibration resistance . . 8
7.5 Bending . 8
Bibliography . 9
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ISO 12614-20:2023(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
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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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
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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 12614 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.
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INTERNATIONAL STANDARD ISO 12614-20:2023(E)
Road vehicles — Liquefied natural gas (LNG) fuel system
components —
Part 20:
Flexible fuel or vent lines
1 Scope
This document specifies tests and requirements for the flexible fuel lines, a liquefied natural gas fuel
system component intended for use on the types of motor vehicles defined in ISO 3833. This document
is not applicable to the following:
a) fuel containers;
b) stationary gas engines;
c) container mounting hardware;
d) electronic fuel management;
e) refuelling receptacles.
NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to
meet the criteria of this document and tested according to the appropriate functional tests.
NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise
specified.
NOTE 3 This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa (16 bar).
2
(1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm .) Other working pressures can be accommodated by adjusting the
pressure by the appropriate factor (ratio). For example, a 2 MPa (20 bar) working pressure system will require
pressures to be multiplied by 1,25.
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 12614-1, Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 1: General
requirements and definitions
ISO 12614-2:2021, Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 2:
Performance and general test methods
ISO 12614-11, Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 11: Fittings
ISO 23208, Cryogenic vessels — Cleanliness for cryogenic service
ANSI/ASME B31.3, Process Piping
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12614-1 and the following
apply.
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ISO 12614-20:2023(E)
ISO and IEC maintain terminology 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/
3.1
braid
layer, or layers, of woven wires covering the hose (3.2) and permanently attached to the flexible hose
assembly (3.3) and end fittings, serving the function of restraining the flexible hose against elongation
3.2
hose
flexible conduit of either corrugated metal or composite material or hose assembly (3.3)
3.3
hose assembly
hose (3.2) with end fittings attached, complete with braid (3.1) and/or other covering
3.4
live length
flexible section of the hose assembly (3.3)
3.5
protection sheath
outer cover fitted to protect the main hose and braid (3.1) against damage and abrasion
4 Marking
Marking of the component shall provide sufficient information to allow the following to be traced:
a) the manufacturer’s or agent’s name, trademark, or symbol;
b) the model designation (part number);
c) the working pressure or pressure and temperature range;
d) the serial number or date code.
The following additional markings are recommended:
— the direction of flow (when necessary for correct installation);
— the type of fuel;
— electrical ratings (if applicable);
— the symbol of the certification agency;
— the type approval number;
— a reference to this document.
NOTE This information can be provided by a suitable identification code on at least one part of the component
when it consists of more than one part.
5 Construction and assembly – Hose assembly
5.1 The hose assembly shall comply with the applicable provisions of ISO 12614-1 and ISO 12614-2,
and with the tests specified in Clause 7.
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ISO 12614-20:2023(E)
5.2 Metallic hose assemblies shall comply with the hose construction in accordance with this
document and with the tests specified in Clause 7.
5.3 A component or material used in a hose assembly shall comply with an applicable standard or
shall be evaluated for the intended application as part of the evaluation of the hose assembly.
5.4 The construction of all parts of a hose assembly, whether specifically covered in this document or
not, shall be in accordance with good engineering practice for safety, durability and maintainability.
NOTE All specifications as to construction set forth herein can be satisfied by the construction prescribed
or such construction as will provide at least equivalent performance.
5.5 The hose nominal size designation shall be based on the inner diameter of the hose. The measured
internal diameter of a corrugated metal hose shall no
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