EN ISO 16924:2018

SLOVENSKI STANDARD
01-junij-2018
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Natural gas fuelling stations - LNG stations for fuelling vehicles (ISO 16924:2016)
Erdgastankstellen - Tankstellen für verflüssigtes Erdgas (LNG) zur Betankung von
Fahrzeugen (ISO 16924:2016)
Stations-service de gaz naturel - Stations GNL pour le ravitaillement de véhicules (ISO
16924:2016)
Ta slovenski standard je istoveten z: EN ISO 16924:2018
ICS:
75.200 2SUHPD]DVNODGLãþHQMH Petroleum products and
QDIWHQDIWQLKSURL]YRGRYLQ natural gas handling
]HPHOMVNHJDSOLQD equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 16924
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2018
EUROPÄISCHE NORM
ICS 75.200
English Version
Natural gas fuelling stations - LNG stations for fuelling
vehicles (ISO 16924:2016)
Stations-service de gaz naturel - Stations GNL pour le Erdgastankstellen - Tankstellen für verflüssigtes
ravitaillement de véhicules (ISO 16924:2016) Erdgas (LNG) zur Betankung von Fahrzeugen (ISO
16924:2016)
This European Standard was approved by CEN on 26 January 2018.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16924:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 16924:2016 has been prepared by ISO/TMBG “Technical Management Board - groups”
of the International Organization for Standardization (ISO) and has been taken over as
Operation” the secretariat of which is held by NEN.
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 October 2018, and conflicting national standards shall
be withdrawn at the latest by October 2018.
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 has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
This document has been prepared under the standardization request M/533 given to CEN by the
European Commission and the European Free Trade Association in the framework of
Directive 2014/94/EU on the deployment of alternative fuels infrastructure.
The standardization request M/533 focuses on interoperability aspects of the alternative fuels
infrastructure, which for LNG fuelling stations are covered in this document by the following items:
— Fuelling pressure (service pressure): This document requires that the pressure of LNG at the nozzle
is lower than the maximum allowable working pressure of the vehicle tank.
— Connector profile: The harmonized connector profile is described in EN ISO 12617:2017, that
specifies LNG refuelling nozzles and receptacles constructed entirely of new and unused parts and
materials for road vehicles powered by LNG, and which is referenced in this document.
In addition to interoperability aspects, the following aspects are relevant for applying this document in
Europe:
— Fuel quality: The quality of LNG for use as automotive fuel is covered in EN 16723-2:2017, that
specifies the requirements and test methods for natural gas, biomethane and blends of both.
— Fuel labelling: The fuel label for LNG at dispensers is covered by EN 16942:2016, that lays down
harmonized identifiers for marketed liquid and gaseous fuels, and which has also been developed
to support Directive 2014/94/EU.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 16924:2016 has been approved by CEN as EN ISO 16924:2018 without any modification.

INTERNATIONAL ISO
STANDARD 16924
First edition
2016-12-01
Natural gas fuelling stations — LNG
stations for fuelling vehicles
Stations-service de gaz naturel — Stations GNL pour le ravitaillement
de véhicules
Reference number
ISO 16924:2016(E)
©
ISO 2016
ISO 16924:2016(E)
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved

ISO 16924:2016(E)
Contents Page
Foreword .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 9
5 Risk management .10
5.1 Risk assessment .10
5.1.1 General.10
5.1.2 Protection against overpressure .10
5.1.3 Static electricity .11
5.2 Fire protection .11
5.2.1 Hazardous area classification .11
5.2.2 Sources of ignition .11
5.2.3 Fire fighting .12
5.3 Explosion protection measures .12
6 General design requirements .12
6.1 General .12
6.1.1 Design philosophy .12
6.1.2 Buildings and civil works .13
6.1.3 Installation and construction .14
6.2 Site layout .15
6.2.1 Separation distances .15
6.2.2 Traffic management .15
6.2.3 Security .15
6.2.4 Requirements for location of equipment .15
6.3 Environmental considerations .16
6.3.1 Noise attenuation .16
6.3.2 Prevention of venting of natural gas .16
7 Fuel supply to the fuelling station .16
7.1 Application .16
7.2 Equipment compatibility .16
7.3 Filling connector .17
7.4 Requirements for filling .17
7.4.1 General requirements .17
7.4.2 Prevention of overpressurization and overfilling .17
7.5 Prevention of back flow .17
7.6 Bleed connections .17
7.7 Draining of liquid from the LNG storage tank .18
7.8 LNG tanker .18
7.8.1 Immobility .18
7.8.2 Anti-drive-away equipment .18
7.8.3 Turning off the engine .18
7.8.4 Equalizing the potentials .18
8 Storage .18
8.1 LNG storage .18
8.1.1 Design and construction .18
8.1.2 Safety requirements .20
8.1.3 Installation guidance .24
8.2 CNG buffer storage .25
9 Pumps and compressors .25
9.1 Connection of LNG pumps to the LNG storage tank .25
ISO 16924:2016(E)
9.1.1 General.25
9.1.2 NPSH requirements .25
9.1.3 Vapour return .25
9.1.4 Protection against weather .25
9.1.5 Accessibility .26
9.2 LNG centrifugal pump (including ancillaries) .26
9.2.1 General provisions.26
9.2.2 Liquid inlet to the centrifugal pump .26
9.2.3 Centrifugal pump design .26
9.2.4 Vibration .26
9.2.5 Detection of shaft seal leak .27
9.2.6 Detection of cavitation .27
9.3 LNG reciprocating pump for LCNG fuelling stations (including ancillaries) .27
9.3.1 General provisions.27
9.3.2 Liquid supplied to the reciprocating pump .27
9.3.3 Design .27
9.3.4 Vibration .27
9.3.5 Pulsation .27
9.4 Commonalities for LNG centrifugal and reciprocating pumps .27
9.4.1 Suction line .27
9.4.2 Instrumentation .28
9.4.3 Markings of a pump .28
9.4.4 Instructions .28
9.5 Natural gas compressor .29
10 Dispensers .29
10.1 LNG dispensers .29
10.1.1 General requirements .29
10.1.2 Breakaway system .31
10.1.3 Fuelling hoses .31
10.1.4 Fuelling nozzles .32
10.1.5 Dispenser enclosure .32
10.1.6 Other requirements .33
10.2 CNG dispensers .33
11 Vaporizers and heaters .34
11.1 Application .34
11.2 Design of vaporizers and heaters .34
11.3 Ambient air vaporizer .35
11.3.1 General.35
11.3.2 Defrosting .35
11.3.3 Aluminium vaporizers .35
11.4 Electric vaporizer/heater .35
11.5 Water bath vaporizer .36
11.6 Fired vaporizers .36
11.7 Remotely heated vaporizers .36
12 Odorization .36
12.1 General requirements .36
12.2 High-pressure odorizer .37
12.3 Safety .37
12.4 Monitoring .37
12.5 Odorant .38
12.6 Dynamics of function .38
13 Pipework .38
13.1 General .38
13.2 Pipework design .38
13.2.1 General.38
13.2.2 Overground pipework .39
iv © ISO 2016 – All rights reserved

ISO 16924:2016(E)
13.2.3 Underground pipework .39
13.2.4 Pipework in ducts .39
13.2.5 Flexible connections .40
14 Electrical equipment and wiring .40
14.1 General .40
14.2 Main considerations .40
14.2.1 Grounding .40
14.2.2 Lightning .40
14.2.3 Contact with live parts .40
14.2.4 Cables . .40
14.2.5 Static electricity .41
14.3 Other considerations .41
14.3.1 Interface .41
14.3.2 Primary seal .41
14.3.3 Additional seal .41
14.3.4 Conduit seals .41
14.3.5 Detection vents .42
15 Instrumentation and control system .42
15.1 General .42
15.2 Gas detectors .42
15.3 Flame detectors .42
15.4 Pressure gauges.42
15.5 Temperature sensors .42
15.6 Manual emergency shutdown devices .42
15.7 Emergency power supply unit .43
16 Emergency shutdown .43
16.1 Application .43
16.2 Procedure .43
16.3 Activation .43
16.4 ESD action .43
16.5 Reset .44
17 Special configurations.44
17.1 Movable LNG fuelling station.44
17.1.1 General requirements .44
17.1.2 Anchoring .44
17.1.3 Containment .44
17.2 Mobile LNG fuelling station .44
17.2.1 General requirements .44
17.2.2 Anchoring .45
17.2.3 Containment .45
17.2.4 Design .45
17.2.5 Additional requirements for operation .45
18 Testing and commissioning .45
18.1 Testing .45
18.1.1 Electrical testing .45
18.1.2 Pressure strength testing .46
18.1.3 Leak testing .46
18.2 Commissioning .46
18.2.1 General provisions.46
18.2.2 Purging .47
18.2.3 Functional testing .47
18.2.4 First filling of the LNG storage tank and other components .47
19 Operations .47
19.1 LNG tanker offloading .47
19.2 Fuelling procedure .47
ISO 16924:2016(E)
19.3 Safety signs .48
19.3.1 General on identification labels .48
19.3.2 Equipment marking .48
19.4 Equipment and pipework identification .49
19.5 Training .49
19.6 Installation and operating instructions .50
19.7 Emergency plan .51
19.8 Maintaining the emergency shutdown .51
20 Inspection and maintenance .51
20.1 Inspection .51
20.1.1 General requirements .51
20.1.2 Inspection and testing of electrical systems .52
20.1.3 Inspection and re-testing of the safety relief valves .52
20.1.4 Safety and fire protection equipment .53
20.2 Maintenance .53
20.2.1 Preventive maintenance planning .53
20.2.2 Maintenance procedures .53
20.2.3 Maintenance safety .53
20.2.4 Draining of the LNG storage tank .54
Annex A (informative) Examples of hazardous zones classification .55
Annex B (normative) Separation distances .59
Annex C (informative) Example flow diagram of an LNG fuelling station .63
Annex D (informative) Example flow diagram of an LCNG fuelling station .64
Annex E (informative) Example flow diagram of an LNG and LCNG fuelling station .65
Annex F (informative) Process requirements for the effective cryogenic pump operation .66
Annex G (informative) Recommendations for installation of a centrifugal pump.68
Annex H (informative) Recommendations for centrifugal pump design .69
Annex I (informative) Recommendations for installation of a reciprocating pump .70
Annex J (informative) Recommendations on the content of the cryogenic pump
operation instructions . .72
Annex K (informative) Example flow diagram of a high-pressure odorizer.74
Annex L (informative) LNG identification mark of an LNG fuelling station .75
Bibliography .76
vi © ISO 2016 – All rights reserved

ISO 16924:2016(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This doc
...