prEN 12979

LPG equipment and accessories - Automotive LPG-systems - Installation requirements

This European Standard specifies the requirements for the installation of automotive LPG components that comply with prEN 12805 and prEN 12806.
These requirements are to ensure safe operation of such components.
This standard does not cover type approval of a LPG motor vehicle.
NOTE   Type approval requirements are covered in UN/ECE Regulations and EU legislation.

Flüssiggas-Geräte und Ausrüstungsteile - Systeme für mit flüssiggas betrieben (LPG) Fahrzeugen - Einbauvorschriften

Équipements pour GPL et leurs accessoires - Véhicules à Gaz de Pétrole Liquéfiés (GPL) - Exigences d'installation

Oprema in pribor za utekočinjeni naftni plin (UNP) - Sistemi za pogon motornih vozil na UNP - Zahteve za vgradnjo

General Information

• Status: Not Published
• ICS: 43.060.40 - Fuel systems
• Technical Committee: CEN/TC 286 - Liquefied petroleum gas equipment and accessories
• Drafting Committee: CEN/TC 286/WG 6 - Automative LPG system
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Due Date: 13-Oct-2021
• Completion Date: 13-Oct-2021
• Ref Project: oSIST prEN 12979:2020 - LPG equipment and accessories - Automotive LPG-systems - Installation requirements

RELATIONS

• Revised: EN 12979:2002 - Automotive LPG-systems - Installation requirements
• Effective Date: 27-Mar-2019

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 12979:2020
01-november-2020
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 betrieben (LPG)

Fahrzeugen - Einbauvorschriften
Équipements pour GPL et leurs accessoires - Véhicules à Gaz de Pétrole Liquéfiés
(GPL) - Exigences d'installation
Ta slovenski standard je istoveten z: prEN 12979
ICS:
43.060.40 Sistemi za gorivo Fuel systems
oSIST prEN 12979:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 12979:2020
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oSIST prEN 12979:2020
DRAFT
EUROPEAN STANDARD
prEN 12979
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 43.060.40 Will supersede 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 Liquéfiés (GPL) - Exigences mit flüssiggas betrieben (LPG) Fahrzeugen -

d'installation Einbauvorschriften

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 286.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12979:2020 E

worldwide for CEN national Members.
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oSIST prEN 12979:2020
prEN 12979:2020 (E)
Contents

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 LPG-system ......................................................................................................................... 9

5.3 Identification mark for LPG vehicles ....................................................................................................... 9

5.4 Changes to the vehicle structure ............................................................................................................... 9

5.5 Container installation .................................................................................................................................... 9

5.6 Installation of more than one container .............................................................................................. 10

5.7 Components on or in the container ....................................................................................................... 10

5.7.1 General requirements ................................................................................................................................ 10

5.7.2 Remote-controlled service valve with excess flow valve on the container ............................. 10

5.7.3 Pressure relief valve ................................................................................................................................... 11

5.7.4 Level indicator .............................................................................................................................................. 11

5.7.5 Gas-tight housing .......................................................................................................................................... 11

5.8 Gas pipes and hoses ..................................................................................................................................... 11

5.9 Gas connections between components of the LPG-system ............................................................ 11

5.10 Remote-controlled shut-off valve ........................................................................................................... 12

5.11 Filling unit ....................................................................................................................................................... 12

5.12 Electrical installation .................................................................................................................................. 12

5.13 Fuel selection system .................................................................................................................................. 13

5.14 Pressure relief device ................................................................................................................................. 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

A.1 General requirements ................................................................................................................................ 15

A.2 Container frame ............................................................................................................................................ 16

Annex B (normative) Provisions regarding the identification of the service coupling .................. 17

Annex C (informative) Installation of more than one container ............................................................. 18

Bibliography ................................................................................................................................................................. 19

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European foreword

This document (prEN 12979:2020) has been prepared by Technical Committee CEN/TC 286 “Liquefied

Petroleum Gas equipment and Accessories”, the secretariat of which is held by NSAI.

This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12979:2002.
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oSIST prEN 12979:2020
prEN 12979:2020 (E)
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, LPG equipment and accessories – Environmental considerations for CEN/TC 286

standards, and this Technical Specification should be read in conjunction with this standard.

It has been assumed in the drafting of this document that execution of its provisions is entrusted to

appropriately qualified and experienced people.
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oSIST prEN 12979:2020
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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.

EN 589, Automotive fuels - LPG - Requirements and test methods
ISO 630, Structural steels - Plates, wide flats, bars, sections and profiles

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 16942, Fuels - Identification of vehicle compatibility - Graphical expression for consumer information

EN 60529, Degrees of protection provided by enclosures (IP Code)

EN 16652-1, LPG equipment and accessories - Automotive LPG vehicles workshops - Part 1: Working areas and

procedures

EN 16652-2, LPG equipment and accessories - Automotive LPG vehicles workshops - Part 2: Personnel

competence and training
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 http://www.electropedia.org/
3.1
automotive LPG
motor fuel according to EN 589
3.2
container
pressure vessel used for the storage of automotive LPG
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3.3
electronic control unit
device that controls the LPG supply to the engine
3.4
excess flow valve
device that cuts off the flow of LPG in case of a pipe fracture or hose rupture
3.5
filling unit

device to be connected with the filling nozzle and enable the filling of the LPG container

3.6
fuel rail
pipe or flexible hose that supplies the fuel to the injection devices
3.7
gas-tight housing

device that protects the components fitted on the container from minor physical damage

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.
3.8
level indicator
device that indicates the liquid level in the container
3.9
Liquefied Petroleum Gas (LPG)

mixture of light hydrocarbons, gaseous under normal atmospheric conditions which can be liquefied by

increased pressure or decreased temperature, the main components are propane, propene, butane and

butene isomers
3.10
non-return valve
valve designed to close automatically to restrict reverse flow
3.11
power supply bushing

gas-tight, insulated, electrical power conductor for components installed inside the container

3.12
pressure relief device (i.e. fusible plug)

device protecting the container from bursting, when exposed to fire, by venting LPG at a pre-set temperature

and/or pressure
3.13
pressure relief valve

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.
3.14
remote-controlled service valve

device that controls the LPG supply to the pressure regulator/vaporiser which is operated remotely

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3.15
test pressure

pressure to which the component or an assembly of components is subjected during the test procedure

3.16
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;
— ECU (Electronic Control Unit) type by the same manufacturer;
— basic software as far as safety issues are concerned;
— installation manual;
— user manual.
3.17
venting tube
duct that connects the gastight housing to the atmosphere
3.18
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.
3.19
working pressure
pressure under normal operating conditions
3.20
80 % stop valve

device that limits the filling of the container to 80 % of the water capacity and acts as a non-return valve

Note 1 to entry: the 80 % stop valve can be combined with the filling unit.
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3.21
overfill protection device
OPD

device designed to automatically reduce the filling rate to a minimal flow when the fill level reaches a

predetermined amount

Note 1 to entry: In automotive applications the predetermined amount is 80 % of the water capacity.

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 LPG-system shall ensure that:

— they possess the expertise and the equipment necessary for the proper installation of the LPG-system,

according to EN 16652 requirements or national regulation,

— they operate according to a quality control system that ensures that the installation of the LPG-system

meets the requirements of this standard,

— they maintain records of the leak test and start-up operations that are carried out after the installation,

— the LPG-system installed in the vehicle functions in such a manner 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 LPG-system where the pressure is less than 20 kPa,

— all parts of the system are securely fastened,
— the LPG-system has been tested and corrected for leaks,

— the LPG-system is installed so 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 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 LPG-system, including its protective material if applicable, excluding the container,

is installed below the lower edge of the vehicle.
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— no component of the 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 LPG-system, the manufacturer of the system shall supply installation

instructions to the installer of the LPG-system.
5.2 Connections to 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 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
...