Road vehicles - Liquefied natural gas (LNG) refuelling connector - 3,1 MPa connector (ISO 12617:2015, Corrected version 2016-01-15)

ISO 12617:2015 specifies liquefied natural gas (LNG) refuelling nozzles and receptacles constructed entirely of new and unused parts and materials for road vehicles powered by LNG. An LNG refuelling connector consists of, as applicable, the receptacle and its protective cap (mounted on the vehicle) and the nozzle. This International standard is applicable only to such devices designed for a maximum working pressure of 3,4 MPa (34 bar) to those using LNG as vehicle fuel and having standardized mating components.
NOTE All references to pressures given in megapascals and bar (1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2) are to be considered gauge pressures, unless otherwise specified.

Straßenfahrzeuge - Betankungsanschluss für Flüssigerdgas (LNG) - 3,1 MPa Anschluss (ISO 12617)

Diese Internationale Norm bestimmt LNG-Füllkupplungen und LNG-Tanknippel, die vollständig aus neuen und zuvor nicht verwendeten Teilen und Werkstoffen hergestellt werden, für Straßenfahrzeuge, die mit Flüssigerdgas (LNG) betrieben werden. Ein LNG-Tankstutzen besteht, soweit anwendbar, aus einem Tanknippel und dessen Schutzkappe (am Fahrzeug montiert) und einer Füllkupplung. Diese Internationale Norm ist nur auf Einrichtungen anwendbar, die für einen maximalen Arbeitsdruck von 3,4 MPa (34 bar) ausgelegt sind, LNG als Treibstoff für Fahrzeuge verwenden und über standardisierte Verbindungskomponenten verfügen.
ANMERKUNG   Alle Verweise auf Drücke in Megapascal und bar (1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2) sind als Überdrücke zu verstehen, sofern nicht anderweitig festgelegt.

Véhicules routiers - Connecteur de remplissage de gaz naturel liquéfié (GNL) - Connecteur à 3,1 MPa (ISO 12617:2015, Version corrigée 2016-01-15)

L'ISO 12617:2015 spécifie des pistolets et des unités de remplissage de gaz naturel liquéfié (GNL) entièrement constitués de pièces et matériaux neufs et non usagés pour les véhicules routiers fonctionnant au GNL. Un connecteur de remplissage de GNL comprend, le cas échéant, l'unité de remplissage et son bouchon de protection (fixés sur le véhicule) et le pistolet. L'ISO 12617:2015 est applicable uniquement aux dispositifs conçus pour une pression de fonctionnement maximale de 3,4 MPa (34 bar) et à ceux utilisant le GNL comme carburant et ayant des composants adjacents standardisés.
NOTE Sauf indication contraire, toutes les références aux pressions exprimées en mégapascals et en bars (1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2) doivent être considéré comme des pressions manométriques.

Cestna vozila - Priključek za polnjenje z utekočinjenim zemeljskim plinom (LNG) - Priključek 3,1 MPa (ISO 12617:2015)

Standard ISO 12617:2015 določa šobe in vtičnice za polnjenje utekočinjenega zemeljskega plina (LNG), ki so v celoti izdelane iz novih in neuporabljenih delov in materialov, za cestna vozila, ki jih poganjajo utekočinjeni zemeljski plini. Priključek za polnjenje utekočinjenega zemeljskega plina je sestavljen iz vtičnice in njenega zaščitnega pokrova (vgrajene v vozilu) ter šobe, kot je primerno. Ta mednarodni standard se uporablja le za naprave, ki so načrtovane za največji delovni tlak 3,4 MPa (34 barov) ter uporabljajo utekočinjeni zemeljski plin kot gorivo vozila in imajo standardizirane stikovne komponente.
OPOMBA: vsa sklicevanja na tlake, podane v megapaskalih in barih (1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2), je treba upoštevati kot tlake merilnika, razen če ni navedeno drugače.

General Information

Status
Published
Publication Date
11-Apr-2017
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
12-Apr-2017
Completion Date
12-Apr-2017

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SLOVENSKI STANDARD
SIST EN ISO 12617:2017
01-junij-2017

Cestna vozila - Priključek za polnjenje z utekočinjenim zemeljskim plinom (LNG) -

Priključek 3,1 MPa (ISO 12617:2015)

Road vehicles - Liquefied natural gas (LNG) refuelling connector - 3,1 MPa connector

(ISO 12617:2015)
Verflüssigtes Erdgas (LNG) Betankung Anschluss - 3,1 MPa Anschluss (ISO
12617:2015)

Véhicules routiers - Connecteur pour le remplissage de gaz naturel liquéfié (GNL) -

Connecteur à 3,1 MPa (ISO 12617:2015)
Ta slovenski standard je istoveten z: EN ISO 12617:2017
ICS:
43.060.40 Sistemi za gorivo Fuel systems
SIST EN ISO 12617:2017 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 12617:2017
---------------------- Page: 2 ----------------------
SIST EN ISO 12617:2017
EN ISO 12617
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2017
EUROPÄISCHE NORM
ICS 43.060.40
English Version
Road vehicles - Liquefied natural gas (LNG) refuelling
connector - 3,1 MPa connector (ISO 12617:2015,
Corrected version 2016-01-15)

Véhicules routiers - Connecteur de remplissage de gaz Straßenfahrzeuge - Betankungsanschluss für

naturel liquéfié (GNL) - Connecteur à 3,1 MPa (ISO verflüssigtes Erdgas (LNG) - 3,1 MPa Anschluss (ISO

12617:2015, Version corrigée 2016-01-15) 12617:2015, korrigierte Fassung 2016-01-15)

This European Standard was approved by CEN on 24 March 2017.

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: Avenue Marnix 17, B-1000 Brussels

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12617:2017 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 12617:2017
EN ISO 12617:2017 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 12617:2017
EN ISO 12617:2017 (E)
European foreword

The text of ISO 12617:2015 , Corrected version 2016-01-15 has been prepared by Technical Committee

ISO/TC 22 “Road vehicles” of the International Organization for Standardization (ISO) and has been

taken over as EN ISO 12617:2017 by Technical Committee CEN/TC 301 “Road vehicles” the secretariat

of which is held by AFNOR.

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 2017, and conflicting national standards shall

be withdrawn at the latest by October 2017.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.

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 12617:2015, Corrected version 2016-01-15 has been approved by CEN as EN

ISO 12617:2017 without any modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 12617:2017
---------------------- Page: 6 ----------------------
SIST EN ISO 12617:2017
INTERNATIONAL ISO
STANDARD 12617
First edition
2015-03-15
Corrected version
2016-01-15
Road vehicles — Liquefied natural
gas (LNG) refuelling connector — 3,1
MPa connector
Véhicules routiers — Connecteur pour le remplissage de gaz naturel
liquéfié (GNL) — Connecteur à 3,1 MPa
Reference number
ISO 12617:2015(E)
ISO 2015
---------------------- Page: 7 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General construction requirements ................................................................................................................................................. 3

4.1 General ........................................................................................................................................................................................................... 3

4.2 LNG refuelling nozzles ...................................................................................................................................................................... 3

4.3 LNG nozzles and receptacles....................................................................................................................................................... 3

4.4 Pressure rating ........................................................................................................................................................................................ 4

4.4.1 Working pressure (maximum allowable pressure) ........................................................................... 4

4.4.2 Maximum service pressure ..................................................................................................................................... 4

4.4.3 Hydrostatic pressure .................................................................................................................................................... 4

4.4.4 Working temperature .................................................................................................................................................. 4

4.5 Materials ....................................................................................................................................................................................................... 4

4.5.1 Corrosion protection .................................................................................................................................................... 4

4.5.2 LNG nozzle and receptacles .................................................................................................................................... 4

4.5.3 Material of the bodies of the receptacle and of the nozzle .......................................................... 4

4.6 Hand operation ....................................................................................................................................................................................... 4

4.7 Sealing exchange ................................................................................................................................................................................... 4

4.8 Installation .................................................................................................................................................................................................. 5

5 Nozzles ............................................................................................................................................................................................................................ 5

5.1 Venting depressurization ............................................................................................................................................................... 5

5.2 Identification ............................................................................................................................................................................................ 5

5.3 Internal check valve ............................................................................................................................................................................ 5

6 Standard receptacle dimensions ......................................................................................................................................................... 5

6.1 Drawing ......................................................................................................................................................................................................... 5

7 Receptacle ................................................................................................................................................................................................................... 6

7.1 Cycle life ........................................................................................................................................................................................................ 6

7.2 Design ............................................................................................................................................................................................................. 6

7.3 Protective cap ........................................................................................................................................................................................... 6

7.4 Mounting ...................................................................................................................................................................................................... 7

7.5 Maximum working temperature ............................................................................................................................................. 7

8 Instructions ................................................................................................................................................................................................................ 7

8.1 Clarity .............................................................................................................................................................................................................. 7

8.2 List of tools ................................................................................................................................................................................................. 7

9 Marking .......................................................................................................................................................................................................................... 7

9.1 Clarity .............................................................................................................................................................................................................. 7

9.2 Manufacturer and International Standard information ...................................................................................... 7

9.3 Date of manufacture ........................................................................................................................................................................... 8

9.3.1 First and second digits ................................................................................................................................................ 8

9.3.2 Third and fourth digits ............................................................................................................................................... 8

9.4 Alternative marking ............................................................................................................................................................................ 8

9.5 Additional marking ............................................................................................................................................................................. 8

10 Tests ................................................................................................................................................................................................................................... 8

10.1 General requirements ....................................................................................................................................................................... 8

10.2 User interface ........................................................................................................................................................................................... 9

10.2.1 Positive locking ................................................................................................................................................................. 9

10.2.2 Safe disconnection .......................................................................................................................................................... 9

10.2.3 Manual force in warm conditions ...................................................................................................................... 9

10.2.4 Manual force at cold conditions under frost ............................................................................................ 9

10.3 Impact resistance of a nozzle...................................................................................................................................................... 9

© ISO 2015 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)

10.4 Receptacle protective cap ...........................................................................................................................................................10

10.5 Leakage at room temperature ................................................................................................................................................10

10.5.1 Nozzle .....................................................................................................................................................................................10

10.5.2 Receptacle ...........................................................................................................................................................................10

10.6 Abnormal loads ...................................................................................................................................................................................11

10.6.1 General...................................................................................................................................................................................11

10.6.2 Test in the unpressurized condition ............................................................................................................11

10.6.3 Test in pressurized condition ............................................................................................................................11

10.7 Durability of the device (Cycle life) ....................................................................................................................................12

10.7.1 Concept of the test of a device ...........................................................................................................................12

10.7.2 Cycle definition ...............................................................................................................................................................12

10.7.3 Test series ...........................................................................................................................................................................12

10.7.4 Exchange of seal of the nozzle and/or receptacle ............................................................................12

10.8 Electrical conductivity ...................................................................................................................................................................12

10.9 Hydrostatic strength .......................................................................................................................................................................13

10.9.1 Test configurations......................................................................................................................................................13

10.9.2 Test procedure and evaluation .........................................................................................................................13

10.10 Corrosion resistance .......................................................................................................................................................................13

10.11 Non-igniting evaluation ................................................................................................................................................................13

Bibliography .............................................................................................................................................................................................................................14

iv © ISO 2015 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(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 document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT), see the following URL: Foreword — Supplementary information.

The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 25, Vehicles

using gaseous fuels.
The corrected version of ISO 12617:2015 incorporates the following corrections.

Figure 1 has been corrected and the key to Figure 1 has been updated to reflect the changes.

© ISO 2015 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 12617:2017
---------------------- Page: 12 ----------------------
SIST EN ISO 12617:2017
INTERNATIONAL STANDARD ISO 12617:2015(E)
Road vehicles — Liquefied natural gas (LNG) refuelling
connector — 3,1 MPa connector
1 Scope

This International Standard specifies liquefied natural gas (LNG) refuelling nozzles and receptacles

constructed entirely of new and unused parts and materials for road vehicles powered by LNG. An

LNG refuelling connector consists of, as applicable, the receptacle and its protective cap (mounted on

the vehicle) and the nozzle. This International standard is applicable only to such devices designed

for a maximum working pressure of 3,4 MPa (34 bar) to those using LNG as vehicle fuel and having

standardized mating components.

NOTE All references to pressures given in megapascals and bar (1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm )

are to be considered gauge pressures, unless otherwise specified.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 14469, Road vehicles — Compressed natural gas (CNG) refuelling connector

ISO 15500-2, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2:

Performance and general test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
check valve

part of the receptacle, or of the nozzle, mounted inside which prevents return flow or venting of fuel

after the nozzle was disconnected from the receptacle
3.2
cycle life

number of refuelling cycles, as specified in this International Standard, which the component can

withstand without leak or without another fail of function
3.3
device
nozzle or receptacle
3.4
dry air

air with moisture content such that the dew point of the air at the required test pressure is at least

11 °C below the ambient test temperature
3.5
hydrostatic pressure

pressure to which a component is taken to verify the structural strength of the component

© ISO 2015 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)
3.6
liquefied natural gas (LNG)

cryogenic liquid produced by reducing the temperature of natural gas to about −162 °C at

atmospheric pressure
3.7
LNG refuelling connector
joined assembly of LNG refuelling nozzle (3.8) and receptacle

Note 1 to entry: Both parts have to have integrated mechanically opened check valves (3.1) which are operated by

each other. The volume between the two check valves shall be reduced to a minimum to minimize the loss of fuel

during the disconnection process.
3.8
LNG refuelling nozzle

device (3.3) which permits quick connection and disconnection of fuel supply hose to the LNG receptacle

in a safe manner
3.9
LNG refuelling receptacle

device (3.3) connected to a vehicle or storage system which receives the LNG refuelling nozzle (3.8) and

permits safe transfer of fuel

Note 1 to entry: The receptacle consists as minimum from a receptacle body and from a check valve (3.1) mounted

inside the body.
3.10
maximum service pressure
maximum pressure of the fuel delivered by the fuelling station
3.11
nominal flow rate

flow rate through the connector at specified density of LNG and at specified pressure difference

3.12
poppet
movable closing part of the check valve (3.1)
3.13
positive locking means

feature which requires actuation of an interlocking mechanism to allow connection/disconnection of

the nozzle from the receptacle

Note 1 to entry: It shall not be possible, except by actuation of the interlocking mechanism, to disconnect under

unsafe conditions when an uncontrolled release of LNG can happen which causes damage to the user and/or

the environment.
3.14
probe
part of the nozzle which enters inner space of the receptacle
3.15
working pressure (maximum allowable pressure)

maximum pressure that an LNG refuelling connector (3.7) can be expected to withstand in actual service

3.16
vapour spillage space
dead volume between the nozzle and the receptacle measured with trapped water
2 © ISO 2015 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)
4 General construction requirements
4.1 General

This International Standard was developed to use in the examination, testing, and certification of newly

produced liquefied natural gas (LNG) vehicle refuelling nozzles and receptacles and, as such, applies

only to the nozzles and receptacles used in LNG refuelling systems and not to the system itself.

A nozzle certified to this International Standard will be functionally compatible from a safety and

performance perspective with all listed receptacles of compatible profile and system pressure. Similarly,

a certified receptacle will be functionally compatible from a safety and performance perspective with

all the listed nozzles of compatible profile and system pressure.

As there may eventually be many different kinds of nozzles and receptacles available from a variety of

manufacturers which, for safety reasons, must all be compatible with one another, this International

Standard specifies a receptacle profile. The nozzle probe shall comply with the receptacle profile. This

standard profile incorporates the design specification (mating dimensions, geometry and tolerances,

and material requirements) which can be considered in the certification of a submitted nozzle or

receptacle. This International Standard refers only to one working pressure and one application.

The construction and performance of nozzles and receptacles are based on the observation that three

main parameters affect user safety and system compatibility, namely the following:

a) working pressure;
All nozzles and receptacles are designed to have a working pressure of 3,4 MPa.
b) design cycle life;

Frequency of use is the second parameter to be considered. Since frequency of use will differ with

the nozzle/receptacle application (i.e. public sector, fleet employee, and residential), all receptacles

will be tested at 10 000 connect/disconnect cycles for compliance with this International

Standard (one fill per day for 27 years). In addition, all nozzles will be tested to a durability test of

20 000 cycles.
c) training.
Operator training required is in accordance with national requirements.
4.2 LNG refuelling nozzles

LNG fuelling nozzles, hereafter referred to as LNG nozzles, and receptacles, hereinafter both also

referred to as devices, manufactured in accordance with this International Standard shall be designed

in accordance with reasonable concepts of safety, durability, and maintainability.

4.3 LNG nozzles and receptacles
LNG nozzles and receptacles shall be
— designed to minimize the possibility of incorrect assembly,

— designed to be secure against displacement, distortion, warping, or other damage,

— constructed to maintain operational integrity under normal and reasonable conditions of handling

and usage, and
— designed with a vapour spillage space less than 25 cm .
© ISO 2015 – All rights reserved 3
---------------------- Page: 15 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)
4.4 Pressure rating
4.4.1 Working pressure (maximum allowable pressure)
3,4 MPa.
4.4.2 Maximum service pressure
3,1 MPa.
4.4.3 H
...

SLOVENSKI STANDARD
SIST EN ISO 12617:2017
01-junij-2017
&HVWQDYR]LOD3ULNOMXþHN]DSROQMHQMHXWHNRþLQMHQHJD]HPHOMVNHJDSOLQD /1* 
3ULNOMXþHN03D ,62

Road vehicles - Liquefied natural gas (LNG) refuelling connector - 3,1 MPa connector

(ISO 12617:2015)
Verflüssigtes Erdgas (LNG) Betankung Anschluss - 3,1 MPa Anschluss (ISO
12617:2015)

Véhicules routiers - Connecteur pour le remplissage de gaz naturel liquéfié (GNL) -

Connecteur à 3,1 MPa (ISO 12617:2015)
Ta slovenski standard je istoveten z: EN ISO 12617:2017
ICS:
43.060.40 Sistemi za gorivo Fuel systems
SIST EN ISO 12617:2017 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 12617:2017
---------------------- Page: 2 ----------------------
SIST EN ISO 12617:2017
EN ISO 12617
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2017
EUROPÄISCHE NORM
ICS 43.060.40
English Version
Road vehicles - Liquefied natural gas (LNG) refuelling
connector - 3,1 MPa connector (ISO 12617:2015)

Véhicules routiers - Connecteur de remplissage de gaz Straßenfahrzeuge - Betankungsanschluss für

naturel liquéfié (GNL) - Connecteur à 3,1 MPa (ISO verflüssigtes Erdgas (LNG) - 3,1 MPa Anschluss (ISO

12617:2015) 12617:2015)
This European Standard was approved by CEN on 24 March 2017.

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: Avenue Marnix 17, B-1000 Brussels

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12617:2017 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 12617:2017
EN ISO 12617:2017 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 12617:2017
EN ISO 12617:2017 (E)
European foreword

The text of ISO 12617:2015 has been prepared by Technical Committee ISO/TC 22 “Road vehicles” of

the International Organization for Standardization (ISO) and has been taken over as EN ISO 12617:2017

by Technical Committee CEN/TC 301 “Road vehicles” the secretariat of which is held by AFNOR.

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 2017, and conflicting national standards shall

be withdrawn at the latest by October 2017.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.

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 12617:2015 has been approved by CEN as EN ISO 12617:2017 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 12617:2017
---------------------- Page: 6 ----------------------
SIST EN ISO 12617:2017
INTERNATIONAL ISO
STANDARD 12617
First edition
2015-03-15
Corrected version
2016-01-15
Road vehicles — Liquefied natural
gas (LNG) refuelling connector — 3,1
MPa connector
Véhicules routiers — Connecteur pour le remplissage de gaz naturel
liquéfié (GNL) — Connecteur à 3,1 MPa
Reference number
ISO 12617:2015(E)
ISO 2015
---------------------- Page: 7 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General construction requirements ................................................................................................................................................. 3

4.1 General ........................................................................................................................................................................................................... 3

4.2 LNG refuelling nozzles ...................................................................................................................................................................... 3

4.3 LNG nozzles and receptacles....................................................................................................................................................... 3

4.4 Pressure rating ........................................................................................................................................................................................ 4

4.4.1 Working pressure (maximum allowable pressure) ........................................................................... 4

4.4.2 Maximum service pressure ..................................................................................................................................... 4

4.4.3 Hydrostatic pressure .................................................................................................................................................... 4

4.4.4 Working temperature .................................................................................................................................................. 4

4.5 Materials ....................................................................................................................................................................................................... 4

4.5.1 Corrosion protection .................................................................................................................................................... 4

4.5.2 LNG nozzle and receptacles .................................................................................................................................... 4

4.5.3 Material of the bodies of the receptacle and of the nozzle .......................................................... 4

4.6 Hand operation ....................................................................................................................................................................................... 4

4.7 Sealing exchange ................................................................................................................................................................................... 4

4.8 Installation .................................................................................................................................................................................................. 5

5 Nozzles ............................................................................................................................................................................................................................ 5

5.1 Venting depressurization ............................................................................................................................................................... 5

5.2 Identification ............................................................................................................................................................................................ 5

5.3 Internal check valve ............................................................................................................................................................................ 5

6 Standard receptacle dimensions ......................................................................................................................................................... 5

6.1 Drawing ......................................................................................................................................................................................................... 5

7 Receptacle ................................................................................................................................................................................................................... 6

7.1 Cycle life ........................................................................................................................................................................................................ 6

7.2 Design ............................................................................................................................................................................................................. 6

7.3 Protective cap ........................................................................................................................................................................................... 6

7.4 Mounting ...................................................................................................................................................................................................... 7

7.5 Maximum working temperature ............................................................................................................................................. 7

8 Instructions ................................................................................................................................................................................................................ 7

8.1 Clarity .............................................................................................................................................................................................................. 7

8.2 List of tools ................................................................................................................................................................................................. 7

9 Marking .......................................................................................................................................................................................................................... 7

9.1 Clarity .............................................................................................................................................................................................................. 7

9.2 Manufacturer and International Standard information ...................................................................................... 7

9.3 Date of manufacture ........................................................................................................................................................................... 8

9.3.1 First and second digits ................................................................................................................................................ 8

9.3.2 Third and fourth digits ............................................................................................................................................... 8

9.4 Alternative marking ............................................................................................................................................................................ 8

9.5 Additional marking ............................................................................................................................................................................. 8

10 Tests ................................................................................................................................................................................................................................... 8

10.1 General requirements ....................................................................................................................................................................... 8

10.2 User interface ........................................................................................................................................................................................... 9

10.2.1 Positive locking ................................................................................................................................................................. 9

10.2.2 Safe disconnection .......................................................................................................................................................... 9

10.2.3 Manual force in warm conditions ...................................................................................................................... 9

10.2.4 Manual force at cold conditions under frost ............................................................................................ 9

10.3 Impact resistance of a nozzle...................................................................................................................................................... 9

© ISO 2015 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)

10.4 Receptacle protective cap ...........................................................................................................................................................10

10.5 Leakage at room temperature ................................................................................................................................................10

10.5.1 Nozzle .....................................................................................................................................................................................10

10.5.2 Receptacle ...........................................................................................................................................................................10

10.6 Abnormal loads ...................................................................................................................................................................................11

10.6.1 General...................................................................................................................................................................................11

10.6.2 Test in the unpressurized condition ............................................................................................................11

10.6.3 Test in pressurized condition ............................................................................................................................11

10.7 Durability of the device (Cycle life) ....................................................................................................................................12

10.7.1 Concept of the test of a device ...........................................................................................................................12

10.7.2 Cycle definition ...............................................................................................................................................................12

10.7.3 Test series ...........................................................................................................................................................................12

10.7.4 Exchange of seal of the nozzle and/or receptacle ............................................................................12

10.8 Electrical conductivity ...................................................................................................................................................................12

10.9 Hydrostatic strength .......................................................................................................................................................................13

10.9.1 Test configurations......................................................................................................................................................13

10.9.2 Test procedure and evaluation .........................................................................................................................13

10.10 Corrosion resistance .......................................................................................................................................................................13

10.11 Non-igniting evaluation ................................................................................................................................................................13

Bibliography .............................................................................................................................................................................................................................14

iv © ISO 2015 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(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 document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT), see the following URL: Foreword — Supplementary information.

The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 25, Vehicles

using gaseous fuels.
The corrected version of ISO 12617:2015 incorporates the following corrections.

Figure 1 has been corrected and the key to Figure 1 has been updated to reflect the changes.

© ISO 2015 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 12617:2017
---------------------- Page: 12 ----------------------
SIST EN ISO 12617:2017
INTERNATIONAL STANDARD ISO 12617:2015(E)
Road vehicles — Liquefied natural gas (LNG) refuelling
connector — 3,1 MPa connector
1 Scope

This International Standard specifies liquefied natural gas (LNG) refuelling nozzles and receptacles

constructed entirely of new and unused parts and materials for road vehicles powered by LNG. An

LNG refuelling connector consists of, as applicable, the receptacle and its protective cap (mounted on

the vehicle) and the nozzle. This International standard is applicable only to such devices designed

for a maximum working pressure of 3,4 MPa (34 bar) to those using LNG as vehicle fuel and having

standardized mating components.

NOTE All references to pressures given in megapascals and bar (1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm )

are to be considered gauge pressures, unless otherwise specified.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 14469, Road vehicles — Compressed natural gas (CNG) refuelling connector

ISO 15500-2, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2:

Performance and general test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
check valve

part of the receptacle, or of the nozzle, mounted inside which prevents return flow or venting of fuel

after the nozzle was disconnected from the receptacle
3.2
cycle life

number of refuelling cycles, as specified in this International Standard, which the component can

withstand without leak or without another fail of function
3.3
device
nozzle or receptacle
3.4
dry air

air with moisture content such that the dew point of the air at the required test pressure is at least

11 °C below the ambient test temperature
3.5
hydrostatic pressure

pressure to which a component is taken to verify the structural strength of the component

© ISO 2015 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)
3.6
liquefied natural gas (LNG)

cryogenic liquid produced by reducing the temperature of natural gas to about −162 °C at

atmospheric pressure
3.7
LNG refuelling connector
joined assembly of LNG refuelling nozzle (3.8) and receptacle

Note 1 to entry: Both parts have to have integrated mechanically opened check valves (3.1) which are operated by

each other. The volume between the two check valves shall be reduced to a minimum to minimize the loss of fuel

during the disconnection process.
3.8
LNG refuelling nozzle

device (3.3) which permits quick connection and disconnection of fuel supply hose to the LNG receptacle

in a safe manner
3.9
LNG refuelling receptacle

device (3.3) connected to a vehicle or storage system which receives the LNG refuelling nozzle (3.8) and

permits safe transfer of fuel

Note 1 to entry: The receptacle consists as minimum from a receptacle body and from a check valve (3.1) mounted

inside the body.
3.10
maximum service pressure
maximum pressure of the fuel delivered by the fuelling station
3.11
nominal flow rate

flow rate through the connector at specified density of LNG and at specified pressure difference

3.12
poppet
movable closing part of the check valve (3.1)
3.13
positive locking means

feature which requires actuation of an interlocking mechanism to allow connection/disconnection of

the nozzle from the receptacle

Note 1 to entry: It shall not be possible, except by actuation of the interlocking mechanism, to disconnect under

unsafe conditions when an uncontrolled release of LNG can happen which causes damage to the user and/or

the environment.
3.14
probe
part of the nozzle which enters inner space of the receptacle
3.15
working pressure (maximum allowable pressure)

maximum pressure that an LNG refuelling connector (3.7) can be expected to withstand in actual service

3.16
vapour spillage space
dead volume between the nozzle and the receptacle measured with trapped water
2 © ISO 2015 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)
4 General construction requirements
4.1 General

This International Standard was developed to use in the examination, testing, and certification of newly

produced liquefied natural gas (LNG) vehicle refuelling nozzles and receptacles and, as such, applies

only to the nozzles and receptacles used in LNG refuelling systems and not to the system itself.

A nozzle certified to this International Standard will be functionally compatible from a safety and

performance perspective with all listed receptacles of compatible profile and system pressure. Similarly,

a certified receptacle will be functionally compatible from a safety and performance perspective with

all the listed nozzles of compatible profile and system pressure.

As there may eventually be many different kinds of nozzles and receptacles available from a variety of

manufacturers which, for safety reasons, must all be compatible with one another, this International

Standard specifies a receptacle profile. The nozzle probe shall comply with the receptacle profile. This

standard profile incorporates the design specification (mating dimensions, geometry and tolerances,

and material requirements) which can be considered in the certification of a submitted nozzle or

receptacle. This International Standard refers only to one working pressure and one application.

The construction and performance of nozzles and receptacles are based on the observation that three

main parameters affect user safety and system compatibility, namely the following:

a) working pressure;
All nozzles and receptacles are designed to have a working pressure of 3,4 MPa.
b) design cycle life;

Frequency of use is the second parameter to be considered. Since frequency of use will differ with

the nozzle/receptacle application (i.e. public sector, fleet employee, and residential), all receptacles

will be tested at 10 000 connect/disconnect cycles for compliance with this International

Standard (one fill per day for 27 years). In addition, all nozzles will be tested to a durability test of

20 000 cycles.
c) training.
Operator training required is in accordance with national requirements.
4.2 LNG refuelling nozzles

LNG fuelling nozzles, hereafter referred to as LNG nozzles, and receptacles, hereinafter both also

referred to as devices, manufactured in accordance with this International Standard shall be designed

in accordance with reasonable concepts of safety, durability, and maintainability.

4.3 LNG nozzles and receptacles
LNG nozzles and receptacles shall be
— designed to minimize the possibility of incorrect assembly,

— designed to be secure against displacement, distortion, warping, or other damage,

— constructed to maintain operational integrity under normal and reasonable conditions of handling

and usage, and
— designed with a vapour spillage space less than 25 cm .
© ISO 2015 – All rights reserved 3
---------------------- Page: 15 ----------------------
SIST EN ISO 12617:2017
ISO 12617:2015(E)
4.4 Pressure rating
4.4.1 Working pressure (maximum allowable pressure)
3,4 MPa.
4.4.2 Maximum service pressure
3,1 MPa.
4.4.3 Hydrostatic pressure
2,5 times working pressure.
4.4.4 Working temperature
4.4.4.1 Receptacle working temperature range (−196 °C
...

SLOVENSKI STANDARD
kSIST FprEN ISO 12617:2017
01-februar-2017
&HVWQDYR]LOD3ULNOMXþHN]DSROQMHQMHXWHNRþLQMHQHJD]HPHOMVNHJDSOLQD /1* 
3ULNOMXþHN03D ,62

Road vehicles - Liquefied natural gas (LNG) refuelling connector - 3,1 MPa connector

(ISO 12617:2015)
Verflüssigtes Erdgas (LNG) Betankung Anschluss - 3,1 MPa Anschluss (ISO
12617:2015)

Véhicules routiers - Connecteur pour le remplissage de gaz naturel liquéfié (GNL) -

Connecteur à 3,1 MPa (ISO 12617:2015)
Ta slovenski standard je istoveten z: FprEN ISO 12617
ICS:
43.060.40 Sistemi za gorivo Fuel systems
kSIST FprEN ISO 12617:2017 en,fr,de

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

---------------------- Page: 1 ----------------------
kSIST FprEN ISO 12617:2017
---------------------- Page: 2 ----------------------
kSIST FprEN ISO 12617:2017
INTERNATIONAL ISO
STANDARD 12617
First edition
2015-03-15
Corrected version
2016-01-15
Road vehicles — Liquefied natural
gas (LNG) refuelling connector — 3,1
MPa connector
Véhicules routiers — Connecteur pour le remplissage de gaz naturel
liquéfié (GNL) — Connecteur à 3,1 MPa
Reference number
ISO 12617:2015(E)
ISO 2015
---------------------- Page: 3 ----------------------
kSIST FprEN ISO 12617:2017
ISO 12617:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 4 ----------------------
kSIST FprEN ISO 12617:2017
ISO 12617:2015(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General construction requirements ................................................................................................................................................. 3

4.1 General ........................................................................................................................................................................................................... 3

4.2 LNG refuelling nozzles ...................................................................................................................................................................... 3

4.3 LNG nozzles and receptacles....................................................................................................................................................... 3

4.4 Pressure rating ........................................................................................................................................................................................ 4

4.4.1 Working pressure (maximum allowable pressure) ........................................................................... 4

4.4.2 Maximum service pressure ..................................................................................................................................... 4

4.4.3 Hydrostatic pressure .................................................................................................................................................... 4

4.4.4 Working temperature .................................................................................................................................................. 4

4.5 Materials ....................................................................................................................................................................................................... 4

4.5.1 Corrosion protection .................................................................................................................................................... 4

4.5.2 LNG nozzle and receptacles .................................................................................................................................... 4

4.5.3 Material of the bodies of the receptacle and of the nozzle .......................................................... 4

4.6 Hand operation ....................................................................................................................................................................................... 4

4.7 Sealing exchange ................................................................................................................................................................................... 4

4.8 Installation .................................................................................................................................................................................................. 5

5 Nozzles ............................................................................................................................................................................................................................ 5

5.1 Venting depressurization ............................................................................................................................................................... 5

5.2 Identification ............................................................................................................................................................................................ 5

5.3 Internal check valve ............................................................................................................................................................................ 5

6 Standard receptacle dimensions ......................................................................................................................................................... 5

6.1 Drawing ......................................................................................................................................................................................................... 5

7 Receptacle ................................................................................................................................................................................................................... 6

7.1 Cycle life ........................................................................................................................................................................................................ 6

7.2 Design ............................................................................................................................................................................................................. 6

7.3 Protective cap ........................................................................................................................................................................................... 6

7.4 Mounting ...................................................................................................................................................................................................... 7

7.5 Maximum working temperature ............................................................................................................................................. 7

8 Instructions ................................................................................................................................................................................................................ 7

8.1 Clarity .............................................................................................................................................................................................................. 7

8.2 List of tools ................................................................................................................................................................................................. 7

9 Marking .......................................................................................................................................................................................................................... 7

9.1 Clarity .............................................................................................................................................................................................................. 7

9.2 Manufacturer and International Standard information ...................................................................................... 7

9.3 Date of manufacture ........................................................................................................................................................................... 8

9.3.1 First and second digits ................................................................................................................................................ 8

9.3.2 Third and fourth digits ............................................................................................................................................... 8

9.4 Alternative marking ............................................................................................................................................................................ 8

9.5 Additional marking ............................................................................................................................................................................. 8

10 Tests ................................................................................................................................................................................................................................... 8

10.1 General requirements ....................................................................................................................................................................... 8

10.2 User interface ........................................................................................................................................................................................... 9

10.2.1 Positive locking ................................................................................................................................................................. 9

10.2.2 Safe disconnection .......................................................................................................................................................... 9

10.2.3 Manual force in warm conditions ...................................................................................................................... 9

10.2.4 Manual force at cold conditions under frost ............................................................................................ 9

10.3 Impact resistance of a nozzle...................................................................................................................................................... 9

© ISO 2015 – All rights reserved iii
---------------------- Page: 5 ----------------------
kSIST FprEN ISO 12617:2017
ISO 12617:2015(E)

10.4 Receptacle protective cap ...........................................................................................................................................................10

10.5 Leakage at room temperature ................................................................................................................................................10

10.5.1 Nozzle .....................................................................................................................................................................................10

10.5.2 Receptacle ...........................................................................................................................................................................10

10.6 Abnormal loads ...................................................................................................................................................................................11

10.6.1 General...................................................................................................................................................................................11

10.6.2 Test in the unpressurized condition ............................................................................................................11

10.6.3 Test in pressurized condition ............................................................................................................................11

10.7 Durability of the device (Cycle life) ....................................................................................................................................12

10.7.1 Concept of the test of a device ...........................................................................................................................12

10.7.2 Cycle definition ...............................................................................................................................................................12

10.7.3 Test series ...........................................................................................................................................................................12

10.7.4 Exchange of seal of the nozzle and/or receptacle ............................................................................12

10.8 Electrical conductivity ...................................................................................................................................................................12

10.9 Hydrostatic strength .......................................................................................................................................................................13

10.9.1 Test configurations......................................................................................................................................................13

10.9.2 Test procedure and evaluation .........................................................................................................................13

10.10 Corrosion resistance .......................................................................................................................................................................13

10.11 Non-igniting evaluation ................................................................................................................................................................13

Bibliography .............................................................................................................................................................................................................................14

iv © ISO 2015 – All rights reserved
---------------------- Page: 6 ----------------------
kSIST FprEN ISO 12617:2017
ISO 12617:2015(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 document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT), see the following URL: Foreword — Supplementary information.

The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 25, Vehicles

using gaseous fuels.
The corrected version of ISO 12617:2015 incorporates the following corrections.

Figure 1 has been corrected and the key to Figure 1 has been updated to reflect the changes.

© ISO 2015 – All rights reserved v
---------------------- Page: 7 ----------------------
kSIST FprEN ISO 12617:2017
---------------------- Page: 8 ----------------------
kSIST FprEN ISO 12617:2017
INTERNATIONAL STANDARD ISO 12617:2015(E)
Road vehicles — Liquefied natural gas (LNG) refuelling
connector — 3,1 MPa connector
1 Scope

This International Standard specifies liquefied natural gas (LNG) refuelling nozzles and receptacles

constructed entirely of new and unused parts and materials for road vehicles powered by LNG. An

LNG refuelling connector consists of, as applicable, the receptacle and its protective cap (mounted on

the vehicle) and the nozzle. This International standard is applicable only to such devices designed

for a maximum working pressure of 3,4 MPa (34 bar) to those using LNG as vehicle fuel and having

standardized mating components.

NOTE All references to pressures given in megapascals and bar (1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm )

are to be considered gauge pressures, unless otherwise specified.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 14469, Road vehicles — Compressed natural gas (CNG) refuelling connector

ISO 15500-2, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2:

Performance and general test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
check valve

part of the receptacle, or of the nozzle, mounted inside which prevents return flow or venting of fuel

after the nozzle was disconnected from the receptacle
3.2
cycle life

number of refuelling cycles, as specified in this International Standard, which the component can

withstand without leak or without another fail of function
3.3
device
nozzle or receptacle
3.4
dry air

air with moisture content such that the dew point of the air at the required test pressure is at least

11 °C below the ambient test temperature
3.5
hydrostatic pressure

pressure to which a component is taken to verify the structural strength of the component

© ISO 2015 – All rights reserved 1
---------------------- Page: 9 ----------------------
kSIST FprEN ISO 12617:2017
ISO 12617:2015(E)
3.6
liquefied natural gas (LNG)

cryogenic liquid produced by reducing the temperature of natural gas to about −162 °C at

atmospheric pressure
3.7
LNG refuelling connector
joined assembly of LNG refuelling nozzle (3.8) and receptacle

Note 1 to entry: Both parts have to have integrated mechanically opened check valves (3.1) which are operated by

each other. The volume between the two check valves shall be reduced to a minimum to minimize the loss of fuel

during the disconnection process.
3.8
LNG refuelling nozzle

device (3.3) which permits quick connection and disconnection of fuel supply hose to the LNG receptacle

in a safe manner
3.9
LNG refuelling receptacle

device (3.3) connected to a vehicle or storage system which receives the LNG refuelling nozzle (3.8) and

permits safe transfer of fuel

Note 1 to entry: The receptacle consists as minimum from a receptacle body and from a check valve (3.1) mounted

inside the body.
3.10
maximum service pressure
maximum pressure of the fuel delivered by the fuelling station
3.11
nominal flow rate

flow rate through the connector at specified density of LNG and at specified pressure difference

3.12
poppet
movable closing part of the check valve (3.1)
3.13
positive locking means

feature which requires actuation of an interlocking mechanism to allow connection/disconnection of

the nozzle from the receptacle

Note 1 to entry: It shall not be possible, except by actuation of the interlocking mechanism, to disconnect under

unsafe conditions when an uncontrolled release of LNG can happen which causes damage to the user and/or

the environment.
3.14
probe
part of the nozzle which enters inner space of the receptacle
3.15
working pressure (maximum allowable pressure)

maximum pressure that an LNG refuelling connector (3.7) can be expected to withstand in actual service

3.16
vapour spillage space
dead volume between the nozzle and the receptacle measured with trapped water
2 © ISO 2015 – All rights reserved
---------------------- Page: 10 ----------------------
kSIST FprEN ISO 12617:2017
ISO 12617:2015(E)
4 General construction requirements
4.1 General

This International Standard was developed to use in the examination, testing, and certification of newly

produced liquefied natural gas (LNG) vehicle refuelling nozzles and receptacles and, as such, applies

only to the nozzles and receptacles used in LNG refuelling systems and not to the system itself.

A nozzle certified to this International Standard will be functionally compatible from a safety and

performance perspective with all listed receptacles of compatible profile and system pressure. Similarly,

a certified receptacle will be functionally compatible from a safety and performance perspective with

all the listed nozzles of compatible profile and system pressure.

As there may eventually be many different kinds of nozzles and receptacles available from a variety of

manufacturers which, for safety reasons, must all be compatible with one another, this International

Standard specifies a receptacle profile. The nozzle probe shall comply with the receptacle profile. This

standard profile incorporates the design specification (mating dimensions, geometry and tolerances,

and material requirements) which can be considered in the certification of a submitted nozzle or

receptacle. This International Standard refers only to one working pressure and one application.

The construction and performance of nozzles and receptacles are based on the observation that three

main parameters affect user safety and system compatibility, namely the following:

a) working pressure;
All nozzles and receptacles are designed to have a working pressure of 3,4 MPa.
b) design cycle life;

Frequency of use is the second parameter to be considered. Since frequency of use will differ with

the nozzle/receptacle application (i.e. public sector, fleet employee, and residential), all receptacles

will be tested at 10 000 connect/disconnect cycles for compliance with this International

Standard (one fill per day for 27 years). In addition, all nozzles will be tested to a durability test of

20 000 cycles.
c) training.
Operator training required is in accordance with national requirements.
4.2 LNG refuelling nozzles

LNG fuelling nozzles, hereafter referred to as LNG nozzles, and receptacles, hereinafter both also

referred to as devices, manufactured in accordance with this International Standard shall be designed

in accordance with reasonable concepts of safety, durability, and maintainability.

4.3 LNG nozzles and receptacles
LNG nozzles and receptacles shall be
— designed to minimize the possibility of incorrect assembly,

— designed to be secure against displacement, distortion, warping, or other damage,

— constructed to maintain operational integrity under normal and reasonable conditions of handling

and usage, and
— designed with a vapour spillage space less than 25 cm .
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kSIST FprEN ISO 12617:2017
ISO 12617:2015(E)
4.4 Pressure rating
4.4.1 Working pressure (maximum allowable pressure)
3,4 MPa.
4.4.2 Maximum service pressure
3,1 MPa.
4.4.3 Hydrostatic pressure
2,5 times working pressure.
4.4.4 Working temperature
4.4.4.1 Receptacle working temperature range (−196 °C to +85 °C)
4.4.4.2 Nozzle working temperature range

The nozzle shall be designed for the temperature of the fuel −196 °C and for an ambient temperature

range of −40 °C to +85 °C.
4.5 Materials
4.5.1 Corrosion protection

Corrosion-resistant materials shall be used (see 10.10). Unless suitably protected against electrolytic

corrosion, dissimilar metals shall not be used in contact with each other.
4.5.2 LNG nozzle and receptacles

LNG nozzles and receptacles shall be manufactured of materials suitable and compatible for use with

LNG at the pressure and the temperature ranges to which they will be subjected which shall be declared

by the manufacturer in the component documentation delivered with the product.
4.5.3 Material of the bodies of the receptacle and of the nozzle
Material of the bodies of the receptacle and of the nozzle should be
a) suitable for the working temperature range,

a) conductive [only conductive materials comply with the electric conductivity test (see 10.8)], and

b) non-sparking according to 10.11.
4.6 Hand operation

LNG nozzles and receptacles shall be so designed as to be operated without the use of tools and excessive

force for connecting and disconnecting.
4.7 Sealing exchange

Design of a device and its check valve sealing shall make possible exchange of the check valve sealing

from the front side using suitable jig and related tools.
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kSIST FprEN ISO 12617:2017
ISO 12617:2015(E)
4.8 Installation
The receptacle shall be installed outside engine compartment.
5 Nozzles
5.1 Venting depressurization

Venting depressurization of all nozzle types is required prior to disconnection. Disconnection of all

nozzles shall be accomplished in accordance with 10.2.
5.2 Identification

The nozzle shall bear a marking in accordance with Clause 9, if necessary, indicating the direction of the

open and shut off operation of the actuating mechanism.
5.3 Internal check valve

The nozzle is equipped with an internal check valve to prevent the escape of gas. The check valve poppet

face contacts with the receptacle poppet face during connection and pushes the receptacle poppet

into the open position to allow rated flow. The reaction force of a nozzle poppet in fully open position,

typically supported by firm stop, shall be larger than the reaction force of receptacle in fully open

position, defined by the stroke of the nozzle, as specified in 7.1. Provision shall be made that movement

of receptacle is not limited by any mechanical part within its stroke as defined in Clause 6.

6 Standard receptacle dimensions
6.1 Drawing
The receptacle shall comply with the dimensions shown in Figure 1.
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kSIST FprEN ISO 12617:2017
ISO 12617:2015(E)
Key
1 nozzle latch plane
Clearance.
Edge radius.
Figure 1 — Dimensions of the receptacle
7 Receptacle
7.1 Cycle life
Receptacle shall have a cycle life as specified in 4.1.
7.2 Design

The receptacle shall be equipped with an internal check valve to prevent the escape of gas. The poppet

of the check valve shall be pressed against the seat with a force of minimum 200 N at a non-pressurized

receptacle. The back force of the receptacle poppet in fully open position shall be maximum of 460 N.

7.3 Protective cap

A receptacle manufacturer validated cap or equivalent design feature shall be provided to prevent dust,

moisture, and other foreign debris from entering the receptacle. This also requires prevention of the

dust entry through the venting holes. The cap has to allow small gas venting originated by warming

the cold gas inside or a minor leak of the receptacle poppet (see 10.5.2). The cap shall be marked by an

undeletable writing of “LNG ONLY”.
6 © ISO 2015 – All rights reserved
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