ISO 22241-4:2019

INTERNATIONAL ISO
STANDARD 22241-4
Second edition
2019-07
Diesel engines — NOx reduction agent
AUS 32 —
Part 4:
Refilling interface
Moteurs diesel — Agent AUS 32 de réduction des NOx —
Partie 4: Interface de remplissage
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Functional requirements . 2
4.2 Filler neck . 4
4.3 Inlet adapter . 5
4.4 Filler cap . 5
4.5 Filler nozzle . 6
4.6 Minimum free space for refilling . 7
Annex A (normative) Compatibility conditions for sealed refilling systems .10
Bibliography .13
Foreword
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electrotechnical standardization.
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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
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.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 34,
Propulsion, powertrain and powertrain fluids.
This second edition of ISO 22241-4 cancels and replaces the first edition (ISO 22241-4:2009) which has
been technically revised. The main changes compared to the previous edition are as follows:
— the definition of AUS 32 has been deleted as it is included in ISO 22241-1 and the document is cited
normatively;
— new definitions have been added;
— the status of Annex A has been changed to normative and the Annex has been revised accordingly;
— Table 1 has been editorially and technically revised.
A list of all parts in the ISO 22241 series can be found on the ISO website.
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.
iv © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 22241-4:2019(E)
Diesel engines — NOx reduction agent AUS 32 —
Part 4:
Refilling interface
1 Scope
This document specifies the refilling interface for the NOx reduction agent AUS 32 in conformance with
ISO 22241-1, which is needed to operate converters with a selective catalytic reduction (SCR) exhaust
treatment system.
This document specifies the minimum functional and geometric requirements of an open refilling
system, in order to ensure compatibility between the on-board refilling system and the off-board
refilling system. Compatibility conditions for a sealed refilling system are provided in Annex A.
This document applies to commercial vehicles and buses as defined in ISO 3833 and having a gross
vehicle mass of more than 3,5 t, designed to use stationary off-board refilling systems. This document
also applies to the nozzle of stationary off-board refilling systems.
NOTE Throughout this document, the term “NOx reduction agent AUS 32” is abbreviated to “AUS 32”.
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 2575, Road vehicles — Symbols for controls, indicators and tell-tales
ISO 22241-1, Diesel engines — NOx reduction agent AUS 32 — Part 1: Quality requirements
ISO 22241-3, Diesel engines — NOx reduction agent AUS 32 — Part 3: Handling, transportation, and storage
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 22241-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at https: //www .iso .org/obp
3.1
refilling system
off-board system and on-board system, including their refilling interface, for dispensing AUS 32 into the
on-board tank of the vehicle (3.12)
3.2
off-board refilling system
stationary equipment for dispensing AUS 32 into the on-board tank of the vehicle (3.12), consisting
typically of tank, pump, hose and filler nozzle (3.3)
3.3
filler nozzle
interfacing part of the off-board refilling system (3.2), which allows the operator to control the flow
of AUS 32 during the filling, consisting of a nozzle spout with a defined interface geometry and an
automatic shut-off system
3.4
on-board refilling system
equipment of the vehicle (3.12) necessary for refilling AUS 32 and consisting typically of an inlet adapter
(3.6), filler neck (3.5), filler cap (3.7) and tank
3.5
filler neck
interfacing part of the on-board refilling system (3.4) where the opening is formed by the inlet adapter
(3.6) to allow the tank to be refilled
3.6
inlet adapter
permanently fixed part of the filler neck (3.5), having a defined interface geometry and incorporating a
magnet ring for preventing misfiling of AUS 32 into the fuel tank
3.7
filler cap
part which is fitted to the filler neck (3.5) to prevent spillage (3.11) as well as to minimize contamination
of AUS 32, and which is temporarily opened or removed for refilling
3.8
open refilling system
universal refilling system (3.1) for which gas tightness between the filler nozzle (3.3) and the filler neck
(3.5) is not required
Note 1 to entry: The open refilling system permits refilling using a small volume container, for example.
3.9
sealed refilling system
specific refilling system (3.1) where the connection between the filler nozzle (3.3) and the filler neck
(3.5) is gas-tight
3.10
canister
container of size one to ten litres capacity, with spout, used to refill the on-board tank of the vehicle (3.12)
3.11
spillage
quantity of fluid that escapes from the filler nozzle (3.3) to the atmosphere after the nozzle has shut off
3.12
vehicle
commercial vehicle or bus as defined in ISO 3833 and having a gross vehicle mass of more than 3,5 t,
designed to use a stationary off-board refilling system (3.2)
4 Requirements
4.1 Functional requirements
The on-board refilling system and the off-board refilling system shall comply with the basic functional
requirements specified in Table 1. Fo
...