oSIST prEN ISO 21058:2021

SLOVENSKI STANDARD
oSIST prEN ISO 21058:2021
01-julij-2021
Cestna vozila - Priključek za polnjenje dimetilnega etra (DME) (ISO 21058:2019)
Road vehicles - Dimethyl Ether (DME) refuelling connector (ISO 21058:2019)
Straßenfahrzeuge - Dimethylether (DME) Nachfüllstutzen (ISO 21058:2019)
Véhicules routiers - Connecteur de remplissage en Dimethyl Ether (DME) (ISO
21058:2019)
Ta slovenski standard je istoveten z: prEN ISO 21058
ICS:
43.060.40 Sistemi za gorivo Fuel systems
oSIST prEN ISO 21058:2021 en,fr,de

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

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

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

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

2 Normative References ..................................................................................................................................................................................... 1

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

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

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

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

7 Receptacles ................................................................................................................................................................................................................. 5

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

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

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

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

10.2 Impact resistance .................................................................................................................................................................................. 7

10.2.1 Nozzle test ............................................................................................................................................................................. 7

10.2.2 Receptacle test ................................................................................................................................................................... 7

10.3 Leakage at room temperature ................................................................................................................................................... 8

10.4 Abnormal loads ...................................................................................................................................................................................... 8

10.4.1 Test in unpressurised condition ......................................................................................................................... 9

10.4.2 Test in pressurised condition ................................................................................................................................ 9

10.5 Mounting hardware torque .......................................................................................................................................................10

10.6 Leakage at low and high temperatures ...........................................................................................................................10

10.7 Nozzle freezing .....................................................................................................................................................................................10

10.8 Durability ..................................................................................................................................................................................................10

10.8.1 Endurance ...........................................................................................................................................................................10

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

10.8.3 Brass material compatibility ..............................................................................................................................13

10.8.4 Resistance to dry heat ..............................................................................................................................................13

10.8.5 Ozone ageing ....................................................................................................................................................................13

10.8.6 Temperature cycle .......................................................................................................................................................14

10.8.7 Compatibility to Dimethyl Ether .....................................................................................................................14

10.8.8 Electrical continuity ...................................................................................................................................................14

10.9 Hydrostatic strength .......................................................................................................................................................................14

10.10 Oxygen ageing .......................................................................................................................................................................................15

10.11 Non-metallic material immersion .......................................................................................................................................15

10.12 Vibration resistance .........................................................................................................................................................................16

10.13 Creep .............................................................................................................................................................................................................16

10.14 Automotive fluid exposure.........................................................................................................................................................16

10.14.1 General...................................................................................................................................................................................16

10.14.2 Test method .......................................................................................................................................................................16

10.14.3 Fluids .................. .................................................... .................................................................................................................17

10.14.4 Pass criteria .......................................................................................................................................................................17

Annex A (normative) Critical dimensions of the nozzle ................................................................................................................18

Annex B (informative) Manufacturing and production test plan ........................................................................................19

Bibliography .............................................................................................................................................................................................................................20

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

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

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

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

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

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

This document was developed to use for the newly produced Dimethyl Ether vehicle fuelling nozzles

and receptacles only. As such, it applies to nozzles and receptacles used in the Dimethyl Ether fuelling

A nozzle meeting the requirements of this document will be functionally compatible from a safety

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

Similarly, a receptacle meeting the requirements of this document will be functionally compatible from

a safety and performance perspective with all 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, should all be compatible with each other, this document

specifies one standardized receptacle profile. This standard profile incorporates the design

specifications (mating materials, geometry and tolerances) which may be considered when evaluating

This document applies only to Dimethyl Ether refuelling connectors hereinafter referred to as devices,

constructed entirely of new, unused parts and materials. Dimethyl Ether refuelling connectors consist

This document applies to devices which use Dimethyl Ether as fuel, hereinafter referred to in this

This document applies to connectors which prevent Dimethyl Ether vehicles from being fuelled by fuel

NOTE All references to pressures (kPa) throughout this document are considered gauge pressures unless

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 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests

ISO 1431-1, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 1: Static and

ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids

ISO 16861, Petroleum products — Fuels (class F) — Specifications of dimethyl ether (DME)

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

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

device which permits quick connection and disconnection of fuel supply hose to the Dimethyl Ether

device connected to a vehicle or storage system which receives the Dimethyl Ether nozzle (3.4) and

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

replaceable gasket ensuring tightness of the connection between the nozzle outlet and the receptacle inlet

number of connections and disconnections between the nozzle (3.4) and the receptacle (3.5) required

4.1 Nozzles and receptacles shall be designed in accordance with reasonable concepts of safety,

1) Working pressure. All nozzles and receptacles are designed to have a working pressure defined by

2) Design life. All nozzles will be tested at 100 000 connect/disconnect cycles and all receptacles at

20 000 connect/disconnect cycles for conformity with this document. The service gasket may be

4.2 Nozzles and receptacles shall be well fitted and manufactured in accordance with good engineering

practice. All construction requirements may be met by either the construction specified in this document

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

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

4.4 Nozzles and receptacles shall be manufactured of materials suitable and compatible for use with

Dimethyl Ether, in accordance with ISO 16861, at the pressure and the temperature ranges to which it

For specific regions, the temperature range specified may not be sufficient. In such a case, a wider

4.5 Nozzles and receptacles shall be operated either to connect or disconnect without the use of tools

c) the maximum push-on force during connection is 100 N at any pressure up to 1 500 kPa in the nozzle;

e) the force to operate the lever, if any, applied at the centre of the grip area of the lever, is 100 N

f) if a latch is provided and in use, it shall be capable of being normally disarmed by the user;

g) provision is made to enable the lever or the whole nozzle to freely rotate over an angle of 360°

h) it is not possible to open the valve in the nozzle if the nozzle is not properly locked and sealed on

j) it is not possible to unlock the nozzle from the receptacle unless the nozzle valve is closed;

k) internal blocking due to freezing does not occur under intended operating conditions;

l) it will withstand a torque of 150 % of the mounting torque specified by the manufacturer

m) the external surfaces of the filling nozzle are corrosion resistant or protected against corrosion

and are made of materials (non-sparking materials) that do not cause sparks when dropped on a

p) the nozzle is provided with a means to securely attach it to the delivery hose;

q) the nozzle shall comply with the performance requirements of Clause 10 to ensure

7.1 Receptacles shall comply with Clauses 4 and 6 to 10 and shall be evaluated with a test nozzle

The failure of any test conducted with the receptacle and nozzle test samples shall constitute a failure of

the submitted receptacle, unless the manufacturer can prove the problem was caused by the test nozzle.

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

Regardless of whether the check valve is opened mechanically or by differential pressure, the flow through

the receptacle, when tested with water, at a differential pressure of 30 kPa, shall be at least 3 l/min.

The check valve shall be dimensioned to be leak-tight for the complete temperature range, also when

The dead volume between the front sealing surface and the front of the internal check valve shall not

7.3 The method for attaching the receptacle to the vehicle fuel system shall not rely on the joint

7.4 The interfacing surface of the receptacle shall be constructed of material that does not cause spark

7.5 The receptacle shall have provisions to be firmly attached to the vehicle and shall comply with

7.7 The receptacle shall not be installed in an area that exceeds a temperature of 85 °C.

7.8 Receptacles shall have a cycle life of more than 20 000 cycles and a service life of more than

Information required for instructions and provisions shall be in an easily understood form.

Special tools required for connection of receptacles to tubing shall be clearly identified in the

Manufacturers of receptacles and nozzles shall provide clear and concise printed instruction and

Information required for marking and provisions shall be in an easily understood form. Marking should

be embossed, cast, stamped or otherwise formed in the part. This includes markings baked into an

9.2 A marking to identify this document shall be provided for each system. This marking may be

located on the package or on a notice placed inside the package in which the device is shipped.

A nozzle and receptacle shall be tested with receptacle and nozzle designs specified in Clauses 4 to 9.

b) all pressure or leak tests shall be conducted with dry air or any other suitable gas; and

A nozzle conditioned for 4 h at −20 °C for moderate operating conditions or −40 °C for cold operating

conditions shall be connected within 2 min to a 5 m length of 19 mm internal diameter refuelling hose at

room temperature, and then dropped 1,3 m onto a concrete floor as shown in Figure 2. The nozzle shall

be dropped ten times at room temperature, then pressurised at the working pressure and subjected to

ten additional drops. Following the above drops, the nozzle shall be capable of normal connection and

disconnection to the receptacle. In addition, the nozzle shall comply with leakage tests specified in 10.3.

The receptacle shall be subjected to an impact test of 10 J. A hardened steel mass of 1 kg shall be dropped

from a height of 1 m so as to deliver the impact velocity 4,4 m/s. This shall be achieved by mounting

the mass in a pendulum. The receptacle shall be installed horizontally on a solid object. The impact of

the mass shall be on the centre of the protruding part of the receptacle (see Figure A.1). Following the

above impact test, the receptacle shall comply with leakage tests specified in 10.3.

Tests shall be conducted at two different pressures: 20 kPa and 1,5 times working pressure.

Pressurised air or nitrogen shall be applied to the coupled (and uncoupled) device. The external body

shall then be checked for bubble leakage using immersion in room temperature water.

Nozzles and receptacles, coupled and uncoupled, shall be either bubble free on the leak test for 2 min

or have a leak rate less than 15 cm /h at a room temperature of 20 °C ± 5 °C. The leak rate shall be

A graduated cylinder that is calibrated in cubic centimetres, filled with the test liquid, shall be placed

At the end of the test period, the liquid displacement in the graduated cylinder is recorded.

The connected nozzle and receptacle shall be subjected to the following abnormal loads for a period of