EN 13423:2021

Natural gas vehicles - Requirements for NGV workshops and the management of compressed natural gas (CNG) vehicles

This document provides requirements for operation of vehicles that use compressed natural gas (CNG) as a fuel for propulsion, covering various aspects of NGV workshops including activities, risk management, planning, personnel, layout, systems and operations. It provides requirements regarding the management of NGVs including use, parking, fuelling for commissioning, inspection, installation, repair and maintenance, disposal, transportation and documentation.
This document is applicable to the management of CNG vehicles with a fuel system pressure of 20 MPa (200 bar) at 15 °C. This document can also be applied to vehicles with higher fuel system pressures, taking into account additional safety aspects.
This document also applies to servicing, repair and maintenance of NGVs when work is not performed on the gas fuel system.

Erdgasfahrzeuge - Anforderungen an Werkstätten für Erdgasfahrzeuge und an den Umgang von mit komprimiertem Erdgas (CNG) betriebenen Fahrzeugen

Dieses Dokument enthält Anforderungen zum Betrieb von Fahrzeugen, die komprimiertes Erdgas (CNG) als Kraftstoff für den Antrieb verwenden und behandelt hierbei verschiedene Aspekte einschließlich Tätigkeiten, Risikomanagement, Planung, Personal, Aufbau, Systeme sowie Betrieb von Werkstätten für Erdgasfahrzeuge. Es enthält Anforderungen an die Handhabung von Erdgasfahrzeugen, einschließlich Gebrauch, Parken, Befüllung für die Inbetriebnahme, Inspektion, Installation, Reparatur und Instandhaltung, Entsorgung, Transport und Dokumentation.
Dieses Dokument gilt für CNG-Fahrzeuge mit einem Druck im Kraftstoffsystem von 20 MPa (200 bar) bei 15 °C. Unter Berücksichtigung zusätzlicher Sicherheitsaspekte kann dieses Dokument auch für Fahrzeuge mit höherem Druck im Kraftstoffsystem herangezogen werden.
Dieses Dokument ist auch für die Instandhaltung, Reparatur und Wartung von erdgasbetriebenen Fahrzeugen anwendbar, wenn keine Arbeiten am Kraftstoffsystem durchgeführt werden.

Exploitation de véhicules fonctionnant au gaz naturel - Exigences relatives aux ateliers pour véhicules GNV et à la gestion des véhicules fonctionnant au gaz naturel comprimé (GNC)

Le présent document fournit des exigences relatives à l'utilisation des véhicules fonctionnant au gaz naturel comprimé (GNC) en tant que carburant, et couvre différents aspects des ateliers pour véhicules GNV, notamment les activités, le management du risque, la planification, le personnel, la disposition, les systèmes et l'exploitation. Il fournit des exigences concernant la gestion des véhicules GNV, y compris l’utilisation, le stationnement, le ravitaillement, l’inspection, l’installation, la réparation et la maintenance, l’élimination, le transport et la documentation.
Le présent document s’applique à la gestion des véhicules fonctionnant au GNC avec un système de carburant sous pression de 20 MPa (200 bar) à 15 °C. Le présent document peut également s’appliquer aux véhicules dont le système de carburant est soumis à des pressions plus élevées, en tenant compte d'aspects de sécurité supplémentaires.
Ce document s'applique également à l'entretien, la réparation et la maintenance des véhicules GNV lorsque des travaux ne sont pas effectués sur le système de carburant à gaz.

Vozila na zemeljski plin - Zahteve za delavnice za vozila na zemeljski plin in upravljanje vozil na stisnjeni zemeljski plin

General Information

• Status: Published
• Publication Date: 30-May-2021
• Withdrawal Date: 30-Aug-2021
• ICS: 43.020 - Road vehicles in general
• ICS: 43.180 - Diagnostic, maintenance and test equipment
• ICS: 75.200 - Petroleum products and natural gas handling equipment
• Technical Committee: CEN/TC 326 - Gas supply for Natural Gas Vehicles (NGV)
• Drafting Committee: CEN/TC 326/WG 3 - NGV Operations
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 24-Feb-2021
• Due Date: 25-Feb-2021
• Completion Date: 24-Feb-2021
• Ref Project: SIST EN 13423:2021 - Natural gas vehicles - Requirements for NGV workshops and the management of compressed natural gas (CNG) vehicles

Relations

• Replaces: EN 13423:2000 - Compressed natural gas vehicle operations
• Effective Date: 02-Mar-2021

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 13423:2021
01-maj-2021
Nadomešča:
SIST EN 13423:2001
Vozila na zemeljski plin - Zahteve za delavnice za vozila na zemeljski plin in
upravljanje vozil na stisnjeni zemeljski plin
Natural gas vehicles - Requirements for NGV workshops and the management of
compressed natural gas (CNG) vehicles
Erdgasfahrzeuge - Anforderungen an Werkstätten und an den Umgang von mit
komprimiertem Erdgas (CNG) betriebenen Fahrzeugen

Exploitation de véhicules fonctionnant au gaz naturel - Exigences relatives aux ateliers

pour véhicules GNV et à la gestion des véhicules fonctionnant au gaz naturel comprimé

(GNC)
Ta slovenski standard je istoveten z: EN 13423:2021
ICS:
43.180 Diagnostična, vdrževalna in Diagnostic, maintenance and
preskusna oprema test equipment
75.060 Zemeljski plin Natural gas
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
SIST EN 13423:2021 en,fr,de

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

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SIST EN 13423:2021
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SIST EN 13423:2021
EN 13423
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2021
EUROPÄISCHE NORM
ICS 43.020; 43.180; 75.200 Supersedes EN 13423:2000
English Version
Natural gas vehicles - Requirements for NGV workshops
and the management of compressed natural gas (CNG)
vehicles

Exploitation de véhicules fonctionnant au gaz naturel - Erdgasfahrzeuge - Anforderungen an Werkstätten und

Exigences relatives aux ateliers pour véhicules GNV et an den Umgang von mit komprimiertem Erdgas (CNG)

à la gestion des véhicules fonctionnant au gaz naturel betriebenen Fahrzeugen
comprimé (GNC)
This European Standard was approved by CEN on 20 December 2020.

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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13423:2021 E

worldwide for CEN national Members.
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SIST EN 13423:2021
EN 13423:2021 (E)

Contents Page

European foreword ............................................................................................................................................ 4

Introduction .......................................................................................................................................................... 5

1 Scope .......................................................................................................................................................... 6

2 Normative references .......................................................................................................................... 6

3 Terms and definitions ......................................................................................................................... 7

4 General provisions ............................................................................................................................. 10

5 NGV workshop activities .................................................................................................................. 11

6 NGV workshop risk management ................................................................................................. 11

6.1 Procedure .............................................................................................................................................. 11

6.2 Risk context ........................................................................................................................................... 11

6.3 Risk assessment .................................................................................................................................. 12

6.4 Risk treatment ..................................................................................................................................... 12

6.5 Risk monitoring and review ........................................................................................................... 12

6.6 Risk documentation ........................................................................................................................... 12

7 NGV workshop planning ................................................................................................................... 12

7.1 Tools and equipment ......................................................................................................................... 12

7.2 Security measures .............................................................................................................................. 13

7.3 Emergency planning .......................................................................................................................... 13

8 NGV workshop occupants ................................................................................................................ 13

8.1 General safety ....................................................................................................................................... 13

8.2 NGV workshop mechanics/technicians ...................................................................................... 13

8.3 Training .................................................................................................................................................. 13

8.4 Qualification ......................................................................................................................................... 14

9 NGV workshop layout ........................................................................................................................ 14

9.1 Designated areas ................................................................................................................................. 14

9.2 Marking of areas .................................................................................................................................. 14

9.3 Hazardous areas .................................................................................................................................. 14

9.4 Warning signs and notices ............................................................................................................... 14

9.5 General atmosphere .......................................................................................................................... 14

9.6 Increased hazards ............................................................................................................................... 15

10 NGV workshop systems .................................................................................................................... 15

10.1 Air compressor system ..................................................................................................................... 15

10.2 Fire protection system ...................................................................................................................... 15

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SIST EN 13423:2021
EN 13423:2021 (E)

10.3 Gas detection system ......................................................................................................................... 16

10.4 Heat and lighting system .................................................................................................................. 16

10.5 Measurement system ........................................................................................................................ 16

10.6 Mechanical ventilation system ...................................................................................................... 16

11 NGV workshop operations............................................................................................................... 16

11.1 Documentation .................................................................................................................................... 16

11.2 Gas leak management ....................................................................................................................... 17

Annex A (normative) Management of NGVs ........................................................................................... 18

Annex B (normative) Management of cylinders ................................................................................... 22

Annex C (informative) Natural gas characteristics .............................................................................. 26

Annex D (informative) NGV workshop tools and equipment .......................................................... 28

Bibliography ....................................................................................................................................................... 30

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SIST EN 13423:2021
EN 13423:2021 (E)
European foreword

This document (EN 13423:2021) has been prepared by Technical Committee CEN/TC 326 “Natural gas

vehicles – Fuelling and operation”, the secretariat of which is held by NEN and TSE.

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 August 2021, and conflicting national standards shall be

withdrawn at the latest by August 2021.

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 13423:2000.

In comparison with the previous edition, the following changes have been included:

— the introduction of minimum requirements instead of recommendations to professionals how to

safely operate vehicles that use compressed natural gas (CNG) as a fuel for propulsion, covering

various aspects of NGV workshops;

— the scope of the document has been expanded by not only addressing the NGV owner and user, but

also other parties dealing with NGVs. These changes are reflected in the Introduction and Scope of

this document and the new aspects have been introduced in the relevant clauses of this document;

— developments and best practices since the publication of the first edition have been taken into

account, also to improve understanding and implementation of this document by the intended user;

— a new Annex is introduced that provides minimum requirements for the user manual of NGVs to be

provided by the OEM or system manufacturer.

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.
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SIST EN 13423:2021
EN 13423:2021 (E)
Introduction

This document addresses NGV workshops and the management of compressed natural gas (CNG)

vehicles. This document can be a useful reference for:
— NGV workshop architects;
— NGV workshop owners;
— NGV workshop staff;
— OEMs;
— system manufacturers;
— NGV owners and users;
— NGV dealers;
— local authorities.
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SIST EN 13423:2021
EN 13423:2021 (E)
1 Scope

This document provides requirements for operation of vehicles that use compressed natural gas (CNG)

as a fuel for propulsion, covering various aspects of NGV workshops including activities, risk

management, planning, personnel, layout, systems and operations. It provides requirements regarding

the management of NGVs including use, parking, fuelling for commissioning, inspection, installation,

repair and maintenance, disposal, transportation and documentation.

This document is applicable to the management of CNG vehicles with a fuel system pressure of 20 MPa

(200 bar) at 15 °C. This document can also be applied to vehicles with higher fuel system pressures, taking

into account additional safety aspects.

This document also applies to servicing, repair and maintenance of NGVs when work is not performed on

the gas fuel system.
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 50402, Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours

or of oxygen — Requirements on the functional safety of gas detection systems

EN 60079-10-1:2015, Explosive atmospheres — Part 10-1: Classification of areas — Explosive gas

atmospheres

EN 60079-29-2, Explosive atmospheres — Part 29-2: Gas detectors — Selection, installation, use and

maintenance of detectors for flammable gases and oxygen

EN ISO 10012, Measurement management systems — Requirements for measurement processes and

measuring equipment (ISO 10012)

ISO 15501-1, Road vehicles — Compressed natural gas (CNG) fuel systems — Part 1: Safety requirements

ISO 15501-2, Road vehicles — Compressed natural gas (CNG) fuel systems — Part 2: Test methods

ISO 19078, Gas cylinders — Inspection of the cylinder installation, and requalification of high pressure

cylinders for the on-board storage of natural gas as a fuel for automotive vehicles

ISO 31000, Risk management — Guidelines
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SIST EN 13423:2021
EN 13423:2021 (E)
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:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
authorized qualification body

body, independent of the NGV workshop, authorized by the certification body to prepare and administer

qualification examinations

[SOURCE: EN ISO 9712:2012, 3.1, modified – ‘employer’ has been changed to ‘NGV workshop’.]

3.2
CNG system

assembly of components (cylinder(s), valves, flexible fuel lines, etc.) and connecting parts (rigid fuel lines,

pipes fitting, etc.) fitted on motor vehicles using CNG in their propulsion system

3.3
competent body

person or corporate body, defined by the national or relevant authority, which by combination of

appropriate qualification, training, experience and resources is able to make objective judgments on a

subject
[SOURCE: ISO 10691:2004, 3.2]
3.4
compressed natural gas
CNG

natural gas used as a fuel for automotive vehicles, typically compressed up to 20 MPa in the gaseous state

[SOURCE: EN 16723-2:2017, 3.5]
3.5
cylinder
pressure vessel used for the storage of compressed natural gas
[SOURCE: EN ISO 16923:2018, 3.15]
3.6
examining body

organization that has been appointed to verify compliance with the applicable standard

Note 1 to entry: In certain cases, an external independent examining body can be required.

[SOURCE: ISO/TR 25901-1:2016, 2.5.30]
3.7
gas-free

less than 10 % of the lower flammable limit of natural gas in air (less than 0,5 % in air)

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SIST EN 13423:2021
EN 13423:2021 (E)
3.8
hazardous area

area in which an explosive gas atmosphere is present, or can be expected to be present, in quantities such

as that special precautions for the construction, installation and use of equipment are required

Note 1 to entry: The interior of many items of process equipment are commonly considered as a hazardous area

even though a flammable atmosphere may not normally be present to account for the possibility of air entering the

equipment. Where specific controls such as inerting are used the interior of process equipment may not need to be

classified as a hazardous area.
[SOURCE: EN 60079-10-1:2015, 3.3.1]
3.9
ignition source
source of energy sufficient to ignite a flammable atmosphere

Note 1 to entry: Ignition sources include naked flames, exposed incandescent material, sparks, electric welding arcs,

and electrical or mechanical equipment not approved for use in hazardous locations.

3.10
incident

unplanned event or occurrence that has been assessed as having an actual or potentially adverse effect

Note 1 to entry: An incident can be classified as a ‘major incident’ or ‘minor incident’. A major incident has effect on

the NGV’s integrity or structural support (vehicle chassis) whereas a minor incident doesn’t. An example of a major

incident is damage to the bonnet/wing, which is designed to crumple to absorb the impact rather than continue to

transfer the momentum to the car’s passengers; a damaged hood can imply a damage on vehicle chassis. An example

of a minor incident is damage to a door panel that can be minor when limited to the skin (outer panel).

[SOURCE: ISO 28007-1:2015, 3.21, modified – ‘event’ has been replaced with ‘unplanned event or

occurrence’ and Note 1 to entry has been added.]
3.11
inspection

process of measuring, examining, testing, gauging or otherwise comparing the product with the

applicable requirements
[SOURCE: ISO 11961:2018, 3.1.19]
3.12
learning outcome

what a person is expected to know, understand or be able to do at the end of a training programme, course

or module
[SOURCE: ISO/IEC TS 17027:2014, 2.57]
3.13
lower flammable limit
LFL

concentration of flammable gas or vapour in air, below which an explosive gas atmosphere does not form

[SOURCE: EN 60079-10-1:2015, 3.6.12]
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SIST EN 13423:2021
EN 13423:2021 (E)
3.14
natural gas

complex gaseous mixture of hydrocarbons, primarily methane, but generally includes ethane, propane

and higher hydrocarbons, and some non-combustible gases such as nitrogen and carbon dioxide

Note 1 to entry: Natural gas can also contain components or contaminants such as mercaptan, sulphur compounds

and/or other chemical species.
Note 2 to entry: Annex C provides characteristics of natural gas.
[SOURCE: EN 16723-2:2017, 3.12, modified – Note 2 to entry has been added.]
3.15
natural gas vehicle
NGV
road vehicle powered by natural gas
3.16
NGV owner
legal entity responsible for the procedures and activities on NGVs
3.17
NGV workshop

dedicated servicing facility, repair and maintenance where work on NGVs is carried out

3.18
purging
displacing natural gas with a non-flammable gas, steam, air or water
3.19
qualification

formal outcome of an assessment and validation process which is obtained when a competent body

determines that an individual has achieved learning outcomes to given standards
[SOURCE: CEN Guide 14:2010, Annex B.2]
3.20
qualified person
individual subjected to qualification process which has passed the qualification
3.21
remote-controlled service valve

device that allows or interrupts the CNG supply to the vaporizer/pressure regulator

3.22
requirement
need or expectation that is stated, generally implied or obligatory

[SOURCE: ISO 9000:2015, 3.6.4, modified — Notes 1 to 6 to entry have been deleted.]

3.23
service pit
hole in the ground providing standing access to the underside of a vehicle
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SIST EN 13423:2021
EN 13423:2021 (E)
3.24
service valve
valve for fluid off-take which is manually operated to provide a leak-tight seal
3.25
service vessel

pressure vessel used for retrieving natural gas from the cylinders of a natural gas vehicle

3.26
system manufacturer

company which can assume technical responsibility for the manufacturing or retrofitting of CNG system

and can demonstrate that it possesses the features required and the necessary means to provide quality

assessment and conformity of production of the CNG system
3.27
technical manager

qualified person which takes responsibility for decisions relating to installation, maintenance and repair

of an NGV system
3.28
vehicle manufacturer

person or body responsible to the approval authority for all aspects of the type approval or authorization

process and for ensuring conformity of production of the vehicle

Note 1 to entry: It is not essential that the person or body be directly involved in all stages of the construction of the

vehicle, system, component or separate technical unit which is the subject of the approval process.

Note 2 to entry: Vehicle manufacturer can also mean vehicle importer where the manufacturer is not represented

in the European Union.

[SOURCE: EN ISO 18542-1:2012, 3.1.17, modified – Note 2 to entry has been added.]

3.29
ventilation

movement of air and its replacement with fresh air, due to the effect of wind, temperature gradients, or

artificial means (for example fans or extractors)
[SOURCE: EN ISO 16923:2018, 3.54]
3.30
venting
controlled release of natural gas to atmosphere
[SOURCE: EN ISO 16923:2018, 3.55]
4 General provisions

The management of NGVs shall be done in accordance with Annex A. The requirements in Annex A are

also intended to apply to the user of the NGV, whether he is the owner, operator or dealer responsible for

the sale or maintenance of the vehicle.
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EN 13423:2021 (E)
5 NGV workshop activities

NGV workshops shall be designed to accommodate one or more of the following activities:

a) NGV system inspection;
b) NGV system installation;
c) NGV system repair;
d) NGV system maintenance;
e) NGV system requalification;
f) NGV system disposal;
g) other non-gas activities.
6 NGV workshop risk management
6.1 Procedure

Risks in relation to the NGV workshop, and of any NGVs that are handled by it, shall be managed according

to the principles outlined in ISO 31000.
6.2 Risk context

Risks in relation to the NGV workshop, and of any NGVs that are handled by it, shall be addressed in

respect of the various key stakeholders and their respective views, including:
a) health and safety organizations;
b) examining bodies;
c) local authority;
d) fire and emergency response providers;
e) environmental agencies;
f) system manufacturers;
g) vehicle manufacturers;
h) NGV workshop owners;
i) NGV workshop personnel;
j) NGV workshop neighbours;
k) NGV users;
l) the general public.
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SIST EN 13423:2021
EN 13423:2021 (E)
6.3 Risk assessment

Risks in relation to the NGV workshop, and of any NGVs that are handled by it, shall be assessed using

appropriate techniques. The risk assessment shall as a minimum include the following aspects of the NGV

workshop:
a) organization;
b) layout;
c) systems;
d) operations.

NOTE EN IEC 31010 provides general guidance on selection and application of systematic techniques for risk

assessment.
6.4 Risk treatment

All identified risks in relation to the NGV workshop and of any NGVs that are handled by it, shall be treated

in a manner which minimizes their impact to an acceptable level for all foreseeable hazards including,

but not limited to:
a) fire and explosion;
b) pressure;
c) asphyxiation;
d) electrocution.
6.5 Risk monitoring and review

All identified risks in relation to the NGV workshop, and of any NGVs that are handled by it, shall be

monitored and reviewed. Risk monitoring and review shall be done on a periodic basis, but can be done

on an ad-hoc basis as well.
6.6 Risk documentation

All identified risks in relation to the NGV workshop, and of any NGVs that are handled by it, shall be

comprehensively documented in a manner that clearly describes how they are managed.

NOTE Documented information can include hazardous area classification drawings, mitigation strategies, and

fire escape routes.
7 NGV workshop planning
7.1 Tools and equipment

The NGV workshop shall have all the tools and equipment necessary to operate on NGVs in accordance

with the vehicle and/or system manufacturer’s requirements. Tools and equipment shall be suitably

managed by a qualified person. Management of tools and equipment shall include procurement, periodic

inspection, calibration, upgrading and replacement.
A non-exhaustive list of recommended tools and equipment is provided in Annex D.

Noise levels from equipment (e.g. compressor or vacuum pump) shall be evaluated. Measures shall be

put in place to minimize the impact of noise on the external environment.
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EN 13423:2021 (E)
7.2 Security measures

The NGV workshop shall implement security measures in order to prevent unauthorized persons from

accessing areas of the site, which could pose a risk to safety.
7.3 Emergency planning
7.3.1 Emergency procedures

The NGV workshop shall have emergency procedures to respond to at least the following events:

a) a suspected or detected gas leak;
b) a fire (conforming to the provisions of the local fire prevention authority);
c) an accident or injury to personnel.
7.3.2 Emergency access and escape

The NGV workshop shall make provisions for emergency access and escape, taking into account the

requirements for access by emergency response providers (e.g. ambulance, fire brigade) and for

emergency access, escape and evacuation.
7.3.3 Emergency equipment

The NGV workshop shall be adequately furnished with appropriate equipment for dealing with

emergency situations, such as fire protection systems (see 10.2) and first-aid kits.

8 NGV workshop occupants
8.1 General safety

The NGV workshop owner shall provide safety instructions to all persons accessing the NGV workshop

premises, including mechanics/technicians, administration staff and visitors.

NGV workshop occupants shall wear adequate personal protective equipment (PPE), where necessary.

8.2 NGV workshop mechanics/technicians
The NGV workshop owner shall ensure that NGV workshop mechanics/technicians are:
a) trained according to the requirements of 8.3;

b) qualified to perform the specific tasks assigned to them according to the written procedures as

defined in B.5.4;
c) provided with the necessary tools and equipment.
8.3 Training

The training of NGV workshop mechanics/technicians shall cover at least the following aspects:

a) hazards and associated risks in relation to the NGV workshop and in the handling of NGVs, including:

— properties of natural gas;
— the presence of NGVs;
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SIST EN 13423:2021
EN 13423:2021 (E)
— systems under pressure;
— release/escape of natural gas.
b) the theory and practice of dealing with emergency situations, for example:
— use of hand-held fire extinguishers;
— evacuation of the NGV workshop.
8.4 Qualification

NGV workshop personnel shall demonstrate that they are qualified for the tasks assigned to them.

NOTE 1 Qualification can be demonstrated by an authorized qualification body.

NOTE 2 ISO/AWI 23684 and ISO/PWI 24671, both under development at date of publication of this document,

will provide requirements for the competence of technical personnel dealing with NGVs as well as training,

qualification and certification.
9 NGV workshop layout
9.1 Designated areas

The NGV workshop shall have clearly designated areas for its various activities. Typical areas include but

are not limited to:
— parking areas for NGVs;
— working areas for NGVs;
— service pits for NGVs;
— storage area for gas containing systems (e.g. cylinders).
9.2 Marking of areas

If the working area does not encompass the entire NGV workshop, the designated working area(s) on the

workshop floor shall be clearly marked.
9.3 Hazardous areas

Hazardous areas within the NGV workshop shall be determined in accordance with EN 60079-10-1.

9.4 Warning signs and notices

The NGV workshop shall display appropriate signage in the hazardous areas addressing the risks to

which persons entering t
...