prEN 13423

SLOVENSKI STANDARD
oSIST prEN 13423:2019
01-oktober-2019
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
Umgang mit erdgasbetriebenen Fahrzeugen
Ta slovenski standard je istoveten z: prEN 13423
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
oSIST prEN 13423:2019 en,fr,de

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

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

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

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

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

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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13423:2019 E

European foreword ............................................................................................................................................ 6

Introduction .......................................................................................................................................................... 7

1 Scope .......................................................................................................................................................... 8

2 Normative references .......................................................................................................................... 8

3 Terms and definitions ......................................................................................................................... 9

4 General provisions ............................................................................................................................. 12

5 NGV workshop activities .................................................................................................................. 12

6 NGV workshop risk management ................................................................................................. 13

6.1 Procedure .............................................................................................................................................. 13

6.2 Risk context ........................................................................................................................................... 13

6.3 Risk assessment .................................................................................................................................. 13

6.4 Risk treatment ..................................................................................................................................... 14

6.5 Risk monitoring and review ........................................................................................................... 14

6.6 Risk documentation ........................................................................................................................... 14

7 NGV workshop planning ................................................................................................................... 14

7.1 Systems management ........................................................................................................................ 14

7.1.1 Operational equipment .................................................................................................................... 14

7.1.2 Upgrading of equipment................................................................................................................... 14

7.1.3 Noise from equipment....................................................................................................................... 14

7.2 Security measures .............................................................................................................................. 15

7.3 Emergency planning .......................................................................................................................... 15

7.3.1 Emergency procedures ..................................................................................................................... 15

7.3.2 Emergency access and escape ........................................................................................................ 15

7.3.3 Emergency equipment ...................................................................................................................... 15

8 NGV workshop personnel ................................................................................................................ 15

8.1 General.................................................................................................................................................... 15

8.2 Training .................................................................................................................................................. 15

8.3 Qualification ......................................................................................................................................... 16

8.4 General safety ....................................................................................................................................... 16

9 NGV workshop layout ........................................................................................................................ 16

9.1 Designated areas ................................................................................................................................. 16

9.2 Marking of areas .................................................................................................................................. 16

9.3 Hazardous areas .................................................................................................................................. 16

9.4 Warning signs and notices ............................................................................................................... 16

9.5 General atmosphere .......................................................................................................................... 17

9.6 Increased hazards ............................................................................................................................... 17

10 NGV workshop systems .................................................................................................................... 17

10.1 Air compressor system ..................................................................................................................... 17

10.2 Fire protection system ...................................................................................................................... 17

10.3 Gas detection system ......................................................................................................................... 17

10.3.1 General.................................................................................................................................................... 17

10.3.2 Portable unit ......................................................................................................................................... 18

10.4 Heat and lighting system .................................................................................................................. 18

10.5 Measurement system ........................................................................................................................ 18

10.6 Mechanical ventilation system ...................................................................................................... 18

11 NGV workshop operations............................................................................................................... 18

11.1 General ................................................................................................................................................... 18

11.2 Documentation .................................................................................................................................... 18

11.2.1 Written procedures ........................................................................................................................... 18

11.2.2 Record keeping .................................................................................................................................... 18

11.3 Gas leak management ....................................................................................................................... 19

11.3.1 Reporting of gas leak ......................................................................................................................... 19

11.3.2 Handling NGVs with gas leaks ........................................................................................................ 19

11.3.3 Isolation of cylinders ......................................................................................................................... 19

Annex A (normative) Management of NGVs ........................................................................................... 20

A.1 Use of NGVs ........................................................................................................................................... 20

A.2 Parking of NGVs ................................................................................................................................... 20

A.3 Inspection of NGVs ............................................................................................................................. 20

A.3.1 Routine assessment ........................................................................................................................... 20

A.3.2 Unplanned assessment ..................................................................................................................... 20

A.4 Installation, repair and maintenance of NGVs ......................................................................... 20

A.4.1 General ................................................................................................................................................... 20

A.4.1.1 CNG system and components.......................................................................................................... 20

A.4.1.1.1 General ............................................................................................................................................ 20

A.4.1.1.2 Location .......................................................................................................................................... 21

A.4.1.2 Dealing with nonconformity ........................................................................................................... 21

A.4.2 Preventative measures ..................................................................................................................... 21

A.4.2.1 Overheating .......................................................................................................................................... 21

A.4.2.1.1 Welding and brazing .................................................................................................................. 21

A.4.2.1.2 Heated paint booth ..................................................................................................................... 21

A.4.2.2 Uncontrolled release of gas ............................................................................................................. 21

A.4.3 Prior to work ........................................................................................................................................ 21

A.4.3.1 CNG system isolation ......................................................................................................................... 21

A.4.3.2 CNG system depressurization ........................................................................................................ 22

A.4.3.2.1 Depressurization cases ............................................................................................................. 22

A.4.3.2.2 Depressurization exclusions ................................................................................................... 22

A.4.3.2.3 Depressurization ......................................................................................................................... 22

A.4.4 During work .......................................................................................................................................... 22

A.4.4.1 Qualified person and conformity assessment .......................................................................... 22

A.4.4.2 Part replacement ................................................................................................................................ 22

A.4.4.3 Operation instructions ..................................................................................................................... 22

A.4.5 After work .............................................................................................................................................. 22

A.4.5.1 Gas-free interior testing ................................................................................................................... 22

A.4.5.2 Gas-tightness testing .......................................................................................................................... 22

A.4.5.3 Leakage testing3 ................................................................................................................................. 23

A.5 Disposal of NGVs .................................................................................................................................. 23

A.5.1 Decommissioning ............................................................................................................................... 23

A.5.2 Scrapping ............................................................................................................................................... 23

A.5.2.1 Authorized centre ............................................................................................................................... 23

A.5.2.2 CNG system emptying and purging ............................................................................................... 23

A.5.2.3 CNG system removal .......................................................................................................................... 23

A.5.2.4 Vehicle disposal – scrapping ........................................................................................................... 23

A.5.2.4.1 Empty the gas system ................................................................................................................. 23

A.5.2.4.2 Informing the disposal agency ............................................................................................... 23

A.5.3 Resale ...................................................................................................................................................... 23

A.6 Transportation of NGVs .................................................................................................................... 23

A.7 Documentation of NGVs .................................................................................................................... 24

Annex B (normative) Management of cylinders ................................................................................... 25

B.1 Use of cylinders .................................................................................................................................... 25

B.1.1 Service conditions............................................................................................................................... 25

B.1.2 Installation instructions ................................................................................................................... 25

B.2 Handling of cylinders ........................................................................................................................ 25

B.2.1 Unacceptable damage........................................................................................................................ 25

B.2.2 Hot work ................................................................................................................................................. 25

B.3 Inspection of cylinders ...................................................................................................................... 25

B.3.1 Inspection interval ............................................................................................................................. 25

B.3.2 Procedure .............................................................................................................................................. 25

B.3.3 Revalidation .......................................................................................................................................... 26

B.3.4 Rejection ................................................................................................................................................ 26

B.4 Storage of cylinders ............................................................................................................................ 26

B.4.1 General.................................................................................................................................................... 26

B.4.2 Hazardous condition.......................................................................................................................... 26

B.4.3 Safe condition ....................................................................................................................................... 26

B.5 Depressurization of cylinders ........................................................................................................ 26

B.5.1 General.................................................................................................................................................... 26

B.5.2 Cases ........................................................................................................................................................ 26

B.5.3 Procedure .............................................................................................................................................. 27

B.5.4 Tasks of the qualified person ......................................................................................................... 27

B.5.5 Flaring ..................................................................................................................................................... 27

B.5.5.1 Procedure .............................................................................................................................................. 27

B.5.5.2 Restrictions ........................................................................................................................................... 27

B.6 Removal of cylinders ......................................................................................................................... 27

B.6.1 Replacement ......................................................................................................................................... 27

B.6.2 Removal of CNG ................................................................................................................................... 28

B.7 Maintenance of cylinders ................................................................................................................. 28

B.8 Mounting of cylinders ....................................................................................................................... 28

B.8.1 Specified case ....................................................................................................................................... 28

B.8.2 Unspecified case .................................................................................................................................. 28

B.9 Gas-freeing of cylinders .................................................................................................................... 28

B.10 Disposal of cylinders ......................................................................................................................... 28

Annex C (informative) Natural gas characteristics .............................................................................. 29

C.1 Information in manual ...................................................................................................................... 29

C.2 Composition of natural gas ............................................................................................................. 29

C.3 Production of CNG .............................................................................................................................. 29

C.4 Hazards ................................................................................................................................................... 30

C.4.1 Toxicity ................................................................................................................................................... 30

C.4.2 Explosion danger ................................................................................................................................ 30

C.4.3 Dispersion ............................................................................................................................................. 30

C.4.4 Compressibility of the gas ............................................................................................................... 30

C.4.5 Corrosion in relation to CNG ........................................................................................................... 30

Annex D (informative) NGV workshop equipment .............................................................................. 32

D.1 Complementary tools ........................................................................................................................ 32

D.2 Measurement tools ............................................................................................................................ 32

D.3 CNG retrofit system specific tools ................................................................................................. 33

Bibliography ....................................................................................................................................................... 34

This document (prEN 13423:2019) 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 document defines the requirements for NGV workshops and the management of compressed natural

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

as a fuel, 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, inspection, installation, repair and maintenance, disposal, transportation

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

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

EN 60079-10-1, 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

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

EN ISO 11439, Gas cylinders - High pressure cylinders for the on-board storage of natural gas as a fuel for

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 and IEC maintain terminological databases for use in standardization at the following addresses:

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

qualification examinations body, independent of the employer, authorized by the certification body to

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

Note 1 to entry: A certification body can be non-governmental or governmental (with or without regulatory