ISO 22241-5:2019 PDF

Diesel engines — NOx reduction agent AUS 32 — Part 5: Refilling interface for passenger cars

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Title (English):

ISO 22241-5:2019

Diesel engines — NOx reduction agent AUS 32 — Part 5: Refilling interface for passenger cars

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 16
Publication date:: July 5, 2019
Edition:: ISO IS 22241 edition 2 version 1
ICS:: 43.060.40

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Description (English):

This document applies to diesel engine powered road vehicles using selective catalytic reduction (SCR) technology. It is primarily intended for use by passenger cars and light commercial vehicles including buses with a gross vehicle mass of not more than 3,5 t, but can also be used by vehicles with a gross vehicle mass of over 3,5 t. 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 selective catalytic reduction (SCR) exhaust treatment system. This document specifies the essential functional and geometric requirements of the refilling system in order to ensure compatibility between the on-board refilling system and the off-board refilling system. For light commercial vehicles and buses having a gross vehicle mass of not more than 3,5 t, the open refilling system specified in ISO 22241‑4 can be used. NOTE Throughout this document, the term "NOx reduction agent AUS 32" is abbreviated to "AUS 32".

Technical details

Technical committee: ISO/TC 22/SC 34 - Propulsion, powertrain and powertrain fluids
SKU: ISO 22241-5:2019

Abstract

Overview

ISO 22241-5:2019 specifies the refilling interface for the NOx reduction agent AUS 32 (commonly called AdBlue®) for passenger cars and light commercial vehicles using Selective Catalytic Reduction (SCR). The standard defines the functional and geometric requirements of the on-board and off-board refilling systems to ensure compatibility, safety and minimal nuisance (spill, odour, pressure) when dispensing AUS 32 into vehicle tanks.

Key topics and technical requirements

Scope: Intended primarily for passenger cars and vehicles up to 3.5 t gross vehicle mass, but applicable to larger vehicles as needed.
Refilling system definition: Includes on-board components (filler neck, filler cap, tank) and off-board equipment (storage, pump, hose, filler nozzle); canister filling (1–10 L) is defined separately.
Flow rate: Maximum flow rate range for refilling 5–10 L/min (except canister and production-line filling).
Automatic shut-off: Required; residual flow after automatic stop ≤ 50 mL.
Spillage: Less than 0.4 mL per refilling (measured with filler neck angle ≥ 30°).
Pressure control: Filler neck pressure must be within ±3 mbar at 5 s after start; return to ambient at end of filling.
Ventilation / odour: During refilling, ammonia concentration at the filler neck must not exceed 15 mg/L.
Temperature & freezing: On-board components designed for approx. −30 °C to +80 °C; off-board −20 °C to +40 °C. AUS 32 freezes at about −11.5 °C and expands ≈7% - protection and thawing considerations required.
Misfilling prevention: Filler neck and nozzle geometries prevent fuel being dispensed into AUS 32 tanks and vice versa.
Materials & cleanliness: Materials in contact with AUS 32 must be compatible (see ISO 22241-3); high manufacturing cleanliness is required.
Mechanical interface: Filler neck uses a buttress thread S 36 × 4 with specified sealing surface; threads designed to withstand at least 5 Nm torque. Screw-coupled nozzles should limit torque to 5 Nm and include internal vapor recovery.

Applications and who uses it

Vehicle manufacturers and design engineers (filler necks, caps, on-board tanks)
Component suppliers (nozzles, hoses, seals)
Service-station and fleet operators (off-board dispensing equipment, refuelling procedures)
Testing laboratories and conformity assessors (spillage, odour, pressure and strength tests)
Regulators and procurement teams specifying safe, compatible AUS 32 refuelling systems

Related standards

ISO 22241-1 - AUS 32 quality requirements
ISO 22241-3 - Handling, transportation and storage; material compatibility and cleanliness
ISO 22241-4 - Open refilling systems (can be used for some light vehicles)
ISO 2575 - Symbols for controls and tell-tales
EN 13012 - Example nozzle standard referenced for automatic shut-off design

ISO 22241-5:2019 helps ensure interoperable, safe and low-nuisance AUS 32 refuelling across vehicle models and refuelling infrastructure - essential for reliable SCR NOx reduction in diesel passenger cars and light commercial vehicles.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Scope: Intended primarily for passenger cars and vehicles up to 3.5 t gross vehicle mass, but applicable to larger vehicles as needed.
Refilling system definition: Includes on-board components (filler neck, filler cap, tank) and off-board equipment (storage, pump, hose, filler nozzle); canister filling (1–10 L) is defined separately.
Flow rate: Maximum flow rate range for refilling 5–10 L/min (except canister and production-line filling).
Automatic shut-off: Required; residual flow after automatic stop ≤ 50 mL.
Spillage: Less than 0.4 mL per refilling (measured with filler neck angle ≥ 30°).
Pressure control: Filler neck pressure must be within ±3 mbar at 5 s after start; return to ambient at end of filling.
Ventilation / odour: During refilling, ammonia concentration at the filler neck must not exceed 15 mg/L.
Temperature & freezing: On-board components designed for approx. −30 °C to +80 °C; off-board −20 °C to +40 °C. AUS 32 freezes at about −11.5 °C and expands ≈7% - protection and thawing considerations required.
Misfilling prevention: Filler neck and nozzle geometries prevent fuel being dispensed into AUS 32 tanks and vice versa.
Materials & cleanliness: Materials in contact with AUS 32 must be compatible (see ISO 22241-3); high manufacturing cleanliness is required.
Mechanical interface: Filler neck uses a buttress thread S 36 × 4 with specified sealing surface; threads designed to withstand at least 5 Nm torque. Screw-coupled nozzles should limit torque to 5 Nm and include internal vapor recovery.

Applications and who uses it

Vehicle manufacturers and design engineers (filler necks, caps, on-board tanks)
Component suppliers (nozzles, hoses, seals)
Service-station and fleet operators (off-board dispensing equipment, refuelling procedures)
Testing laboratories and conformity assessors (spillage, odour, pressure and strength tests)
Regulators and procurement teams specifying safe, compatible AUS 32 refuelling systems

Related standards

ISO 22241-1 - AUS 32 quality requirements
ISO 22241-3 - Handling, transportation and storage; material compatibility and cleanliness
ISO 22241-4 - Open refilling systems (can be used for some light vehicles)
ISO 2575 - Symbols for controls and tell-tales
EN 13012 - Example nozzle standard referenced for automatic shut-off design

ISO 22241-5:2019 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Related standards

Diesel engines — NOx reduction agent AUS 32 — Part 3: Handling, transportation and storing

Diesel engines — NOx reduction agent AUS 32 — Part 1: Quality requirements — Amendment 1

Diesel engines — NOx reduction agent AUS 32 — Part 4: Refilling interface

Road vehicles — Symbols for controls, indicators and tell-tales — Amendment 4