EN 12979:2022

SLOVENSKI STANDARD
01-september-2022
Nadomešča:
SIST EN 12979:2002
Oprema in pribor za utekočinjeni naftni plin (UNP) - Sistemi za pogon motornih
vozil na UNP - Zahteve za vgradnjo
LPG equipment and accessories - Automotive LPG-systems - Installation requirements
Flüssiggas Geräte und Ausrüstungsteile - Systeme für mit Flüssiggas (LPG) betriebene
Fahrzeuge - Einbauvorschriften
Équipements pour GPL et leurs accessoires - Véhicules à gaz de pétrole liquéfié (GPL) -
Exigences d'installation
Ta slovenski standard je istoveten z: EN 12979:2022
ICS:
43.060.40 Sistemi za gorivo Fuel systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12979
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2022
EUROPÄISCHE NORM
ICS 43.060.40 Supersedes EN 12979:2002
English Version
LPG equipment and accessories - Automotive LPG-systems
- Installation requirements
Équipements pour GPL et leurs accessoires - Véhicules Flüssiggas Geräte und Ausrüstungsteile - Systeme für
à gaz de pétrole liquéfié (GPL) - Exigences mit Flüssiggas (LPG) betriebene Fahrzeuge -
d'installation Einbauvorschriften
This European Standard was approved by CEN on 27 April 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12979:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols and abbreviated terms . 8
5 Installation requirements . 8
5.1 General requirements . 8
5.2 Connections to automotive LPG-system . 9
5.3 Identification mark for LPG vehicles . 10
5.4 Changes to the vehicle structure . 10
5.5 Container installation . 10
5.6 Installation of more than one container . 10
5.7 Components on or in the container . 11
5.8 Gas pipes and hoses . 12
5.9 Gas connections between components of the automotive LPG-system . 12
5.10 Remote-controlled shut-off valve . 12
5.11 Filling unit . 13
5.12 Electrical installation . 13
5.13 Fuel selection system . 13
5.14 Pressure relief device (PRD) . 13
5.15 Installation manual . 13
6 Markings in case of retrofit installation . 14
Annex A (normative)  Container fixing requirements up to a capacity of 150 l . 15
Annex B (normative)  Provisions regarding the identification of the service coupling . 17
Annex C (informative)  Installation of more than one container . 18
Bibliography . 19

European foreword
This document (EN 12979:2022) has been prepared by Technical Committee CEN/TC 286 “Liquefied
Petroleum Gas equipment and Accessories”, the secretariat of which is held by NSAI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by December 2022, and conflicting national standards shall be
withdrawn at the latest by December 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12979:2002.
In comparison with the previous edition, the following technical modifications have been made:
— Revised definitions;
— Updated normative references;
— Addition of a new component (5.7.6 "Manual shut-off container valve").
Any feedback and questions on this document should be directed to the users’ national standards body. A
complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia,
Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Introduction
This document specifies requirements for the installation of equipment for the use of Liquefied Petroleum
Gas (LPG) in automotive propulsion systems.
This document calls for the use of substances and procedures that can be injurious to health if adequate
precautions are not taken. It refers only to technical suitability and does not absolve the user from legal
obligations relating to health and safety at any stage.
Protection of the environment is a key political issue in Europe and elsewhere, for CEN/TC 286 this is
covered in CEN/TS 16765 [3], which should be read in conjunction with this document. The Technical
Specification provides guidance on the environmental aspects to be considered regarding equipment and
accessories produced for the LPG industry and the following is addressed:
a) design;
b) manufacture;
c) packaging;
d) use and operation; and
e) disposal.
It has been assumed in the drafting of this document that execution of its provisions is entrusted to
appropriately qualified and experienced people.
1 Scope
This document specifies the requirements for the installation of automotive LPG components that comply
with EN 12805 and EN 12806.
These requirements are to ensure safe operation of such components.
This document does not cover type approval of LPG motor vehicles.
NOTE Type approval requirements are covered in UN/ECE Regulations and EU legislation.
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 630-4, Structural steels — Part 4: Technical delivery conditions for high yield strength quenched and
tempered structural steel plates and wide flats
ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and
studs with specified property classes — Coarse thread and fine pitch thread
EN 12805, Automotive LPG components - Containers
EN 12806, Automotive liquefied petroleum gas components - Other than containers
EN 16652-2, LPG equipment and accessories - Automotive LPG vehicles workshops - Part 2: Personnel
competence and training
EN 60529, Degrees of protection provided by enclosures (IP Code)
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1
liquefied petroleum gas
LPG
low pressure liquefied gas composed of one or more light hydrocarbons which are assigned to UN 1011, UN
1075, UN 1965, UN 1969 or UN 1978 only and which consists mainly of propane, propene, butane, butane
isomers, butene with traces of other hydrocarbon gases
Note 1 to entry: For automotive LPG specification, see EN 589.
3.2
automotive LPG-system
assembly of components enabling a vehicle to use automotive LPG in its propulsion system
Note 1 to entry: Requirements for each components are specified in their specific annexes.
3.3
container
pressure vessel used for the storage of automotive LPG
3.4
electronic control unit
ECU
device that controls the LPG supply to the engine and the electrical power supply to the remote-controlled
service valves
3.5
excess flow valve
valve designed to close automatically, with a small residual flow, when the fluid flow passing through it
exceeds a predetermined value, and to re-open when the pressure differential across the valve has been
restored below a certain value
3.6
filling unit
device installed on the outside of the vehicle to receive the filling nozzle and enable the filling of the LPG
container
3.7
flexible hoses
flexible ducts that convey LPG liquid or vapour at various pressures from one point to another
3.8
fuel rail
pipe or flexible hose that supplies the fuel to the injection devices
3.9
gas-tight housing
device that vents any leak from components fitted to the container to the venting tube
Note 1 to entry: It also collects and ducts any leaks to the outside of the vehicle, where necessary through a
connecting hose and a lead-through.
3.10
gas tube
tubing made of metallic material which has been designed not to flex in normal operation and through which
LPG flows
3.11
level indicator
device that indicates the liquid level in the container
3.12
non-return valve
valve designed to close automatically to prevent reverse flow
3.13
pressure relief device
PRD
device protecting the container from bursting, when exposed to fire, by venting LPG at a pre-set temperature
and/or pressure
3.14
pressure relief valve
PRV
self-closing valve which automatically, without the assistance of any energy other than that of the vapour
concerned, discharges vapour at a predetermined pressure, and operates with a pop action
Note 1 to entry: This is known as a “safety valve” in ADR.
3.15
remote-controlled service valve with excess flow valve
device that allows or interrupts the LPG supply to the vaporizer/pressure regulator, which is operated
remotely and is combined with an excess flow valve
3.16
remote-controlled shut-off valve
valve to provide a leak-tight seal which is remotely operated
3.17
service coupling
connector in the fuel line between the container and the engine for emergency fuelling
Note 1 to entry: If a mono-fuel vehicle is out of fuel, the engine can be operated by means of a service container
coupled to the service coupling.
3.18
type of automotive LPG-system
LPG-system or family of LPG-systems which have the following characteristics in common:
— automotive LPG-system manufacturer;
— pressure regulator/vaporizer type and manufacturer;
— gas fuelling system type and manufacturer, i.e. induction mixer, injector device, vapour or liquid, single
or multipoint injection system:
— sensors;
— container type and manufacturer;
— container accessories type and manufacturer;
— container frame;
— Electronic Control Unit (ECU) type by the same manufacturer;
— basic software as far as safety issues are concerned;
— installation manual;
— user manual
3.19
venting tube
duct that connects the gas-tight housing to the atmosphere
3.20
vehicle type
vehicle or family of vehicles which have the following characteristics in common:
— the manufacturers type designation;
— the essential aspects of design and construction;
— chassis/floor-pan;
— installation of the LPG equipment
3.21
maximum allowable pressure
PS
maximum pressure for which the equipment is designed
Note 1 to entry: All pressures are gauge pressures, unless otherwise stated.
3.22
80 % stop valve
device that limits the filling of the container to 80 % of the water capacity and acts as a non-return valve
3.23
manual shut-off container valve
manually operated shut-off valve which is rigidly fixed to the container
4 Symbols and abbreviated terms
EMC Electro-Magnetic Compatibility
g acceleration due to gravity
PRV Pressure Relief Valve
PRD Pressure Relief Device
5 Installation requirements
5.1 General requirements
The installer of the automotive LPG-system shall ensure that:
— they possess the expertise and the equipment necessary for the proper installation of the automotive
LPG-system, according to EN 16652-2 requirements;
NOTE National regulations can apply.
— they operate according to a quality control system that ensures that the installation of the automotive
LPG-system meets the requirements of this document;
— they maintain records of the leak test and start-up operations that are carried out after the installation;
— the automotive LPG-system installed in the vehicle functions in such a way that the pressure for which it
has been designed and approved cannot be exceeded;
— all components of the automotive LPG-system comply with EN 12805 and EN 12806;
— additional equipment required for the effective operation of the engine, not covered by EN 12805 and
EN 12806 are installed only in parts of the automotive LPG-system where the pressure is less than
20 kPa;
— all parts of the system are securely fastened;
— the automotive LPG-system has been tested and corrected for leaks;
— the automotive LPG-system is installed in such a way that it is adequately protected against damage due
to moving vehicle components, collision, grit or to the loading or unloading of the vehicle or the shifting
of those loads;
— all components are installed so that it is possible to inspect them and the relevant markings can be read;
— excluding the container, no component of the automotive LPG-system, including any protective material
that form part of such components, projects beyond the external surface of the vehicle, with the
exception of the vehicle connector if this does not project more than 10 mm beyond the nominal line of
the body panel;
— no component of the automotive LPG-system, including its protective material if applicable, excluding
the container, is installed below the lower edge of the vehicle;
— no component of the automotive LPG-system is located within 100 mm of the exhaust or similar heat
source, unless adequate shielding against heat is provided;
— the installation of the automotive LPG-system complies with the relevant electro-magnetic compatibility
(EMC) requirements.
In case of a retrofit installation of the automotive LPG-system, the manufacturer of the system shall supply
installation instructions to the installer of the automotive LPG-system.
5.2 Connections to automotive LPG-system
No appliances shall be connected to the propulsion system other than those strictly required for the proper
operation of the engine of the motor vehicle.
Motor vehicles of categories M , M , N , N and M having a maximum total mass of more than 3 500 kg fitted
2 3 2 3 1
with a compartment heating system which is connected to the automotive LPG-system shall be adequately
protected against unintended gas escape and the operation of the LPG propulsion system shall not be
affected.
NOTE For vehicle categories, refer to Directive 2007/46/EC.
Cooking appliances connected to the vapour phase of the container shall be adequately protected against
unintended gas escape and the operation of the LPG propulsion system shall not be affected.
Heating and/or cooking system shall not be connected to the liquid phase of the container. The
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