Road vehicles -- Liquefied natural gas (LNG) integrated low pressure refuelling and venting connector -- 1,8 MPa connector

This document 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 the nozzle. This document is applicable only to such devices designed for a working pressure of 1,8 MPa to those using LNG as vehicle fuel and having standardized mating components. NOTE All references to pressures in this document are considered gauge pressures, unless otherwise specified.

Véhicules routiers - Connecteur de ravitaillement et de ventilation basse pression intégré pour gaz naturel liquéfié (GNL) - Connecteur 1,8 MPa

General Information

Status
Published
Publication Date
30-Oct-2019
Current Stage
6060 - International Standard published
Start Date
26-Sep-2019
Completion Date
31-Oct-2019
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ISO/TS 21104:2019 - Road vehicles -- Liquefied natural gas (LNG) integrated low pressure refuelling and venting connector -- 1,8 MPa connector
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TECHNICAL ISO/TS
SPECIFICATION 21104
First edition
2019-10
Road vehicles — Liquefied natural
gas (LNG) integrated low pressure
refuelling and venting connector —
1,8 MPa connector
Reference number
ISO/TS 21104:2019(E)
ISO 2019
---------------------- Page: 1 ----------------------
ISO/TS 21104:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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.
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Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2019 – All rights reserved
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ISO/TS 21104:2019(E)
Contents Page

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

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

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

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

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

4.1 Design ............................................................................................................................................................................................................. 3

4.1.1 Spillage ..................................................................................................................................................................................... 3

4.1.2 Positive locking device ................................................................................................................................................ 3

4.1.3 Design cycle life ................................................................................................................................................................. 3

4.2 Pressure rating ........................................................................................................................................................................................ 3

4.3 Working temperature ........................................................................................................................................................................ 3

4.4 Materials ....................................................................................................................................................................................................... 3

4.4.1 Corrosion protection .................................................................................................................................................... 4

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

4.5 Operation ..................................................................................................................................................................................................... 4

4.6 Sealing exchange ................................................................................................................................................................................... 4

4.7 Installation .................................................................................................................................................................................................. 4

5 Nozzles ............................................................................................................................................................................................................................ 4

5.1 Venting depressurization ............................................................................................................................................................... 4

5.2 Identification ............................................................................................................................................................................................ 4

6 Standard receptacle dimensions ......................................................................................................................................................... 4

7 Receptacle ................................................................................................................................................................................................................... 5

7.1 Cycle life ........................................................................................................................................................................................................ 5

7.2 Design ............................................................................................................................................................................................................. 5

7.3 Protective cap ........................................................................................................................................................................................... 5

7.4 Mounting ...................................................................................................................................................................................................... 5

8 Instructions ................................................................................................................................................................................................................ 6

9 Marking .......................................................................................................................................................................................................................... 6

9.1 Clarity .............................................................................................................................................................................................................. 6

9.2 Manufacturer and International Standard information ...................................................................................... 6

9.3 Date of manufacture ........................................................................................................................................................................... 6

9.3.1 Additional marking ........................................................................................................................................................ 6

10 Tests ................................................................................................................................................................................................................................... 7

10.1 General requirements ....................................................................................................................................................................... 7

10.2 Test program ............................................................................................................................................................................................. 7

10.3 User-interface .......................................................................................................................................................................................... 7

10.3.1 Positive locking ................................................................................................................................................................. 7

10.3.2 Safe disconnection .......................................................................................................................................................... 8

10.3.3 Manual force in at T = + 20 °C +/-5 °C ........................................................................................................... 8

10.3.4 Manual force at high humidity ............................................................................................................................. 8

10.4 Impact resistance of a nozzle...................................................................................................................................................... 8

10.5 Abnormal loads ...................................................................................................................................................................................... 9

10.5.1 General...................................................................................................................................................................................... 9

10.5.2 Test in the unpressurized condition ............................................................................................................10

10.5.3 Test in pressurized condition ............................................................................................................................10

10.6 Leak test .....................................................................................................................................................................................................10

10.6.1 Hydrostatic pressure test ......................................................................................................................................10

10.6.2 Leakage test ...................................................................... .................................................................................................11

10.7 Durability of the device (cycle life) .....................................................................................................................................11

10.7.1 Concept of the test of a device ...........................................................................................................................11

10.7.2 Cycle definition ...............................................................................................................................................................11

© ISO 2019 – All rights reserved iii
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ISO/TS 21104:2019(E)

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 Corrosion resistance .......................................................................................................................................................................12

10.10 Non-Destructive Examination (NDE) ...............................................................................................................................12

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

iv © ISO 2019 – All rights reserved
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ISO/TS 21104:2019(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 of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 22, Road Vehicles, Subcommittee SC 41,

Specific aspects for gaseous fuels.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2019 – All rights reserved v
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TECHNICAL SPECIFICATION ISO/TS 21104:2019(E)
Road vehicles — Liquefied natural gas (LNG) integrated
low pressure refuelling and venting connector — 1,8 MPa
connector
1 Scope

This document 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 the nozzle. This document

is applicable only to such devices designed for a working pressure of 1,8 MPa to those using LNG as

vehicle fuel and having standardized mating components.

NOTE All references to pressures in this document are considered gauge pressures, unless otherwise

specified.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

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

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

Performance and general test methods
ISO 19723 (all parts), Road vehicles — Liquefied natural gas (LNG) fuel systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
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 document, which the component can withstand without

leak or without another fail of function
3.3
device
nozzle or receptacle
© ISO 2019 – All rights reserved 1
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ISO/TS 21104:2019(E)
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
liquefied natural gas
LNG

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

pressure (depending on LNG composition)
3.6
LNG refuelling connector

joined assembly of LNG refuelling nozzle (3.7) and LNG refuelling receptacle (3.8) for refuelling and

venting via one channel
3.7
LNG refuelling nozzle

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

in a safe manner
3.8
LNG refuelling receptacle

device (3.3) connected to a vehicle or storage system which receives the LNG refuelling nozzle (3.7) and

permits safe transfer of fuel
3.9
maximum service pressure
maximum pressure of the fuel delivered by the fuelling station
3.10
working pressure
maximum allowable pressure

maximum pressure that an LNG refuelling connector (3.6) can be expected to withstand in actual service

3.11
hydrostatic pressure

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

3.12
high humidity weather conditions
weather condition with 95 % to 100 % relative humidity at T = + 20 °C
3.13
poppet
movable closing part of the check valve (3.1)
3.14
positive locking device

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

the nozzle from the receptacle
3.15
vapour spillage space

dead volume in the LNG refuelling connector between the nozzle and the receptacle measured with

trapped water
2 © ISO 2019 – All rights reserved
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ISO/TS 21104:2019(E)
3.16
non-sparking materials

materials that do not contain, by mass, more than: 7,5 % in total of magnesium, titanium and zirconium

Note 1 to entry: According to IEC EN 60079-0:2011 Clause 8.3 for EPL Gb.
4 General construction requirements
4.1 Design
LNG nozzles and receptacles shall be:
— designed to minimize the possibility of incorrect
...

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