Part 1: Quality requirements

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INTERNATIONAL STANDARD

ISO 22241-1 First edition 2006-10-15

Diesel engines — NOx reduction agent AUS 32 — Part 1: Quality requirements Moteurs diesel — Agent AUS 32 de réduction des NOx — Partie 1: Exigences de qualité

Reference number ISO 22241-1:2006(E)

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ISO 22241-1:2006(E)

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ISO 22241-1:2006(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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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. ISO 22241-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 5, Engine tests. This first edition cancels and replaces ISO/PAS 22241-1:2005, which has been technically revised. ISO 22241 consists of the following parts, under the general title Diesel engines — NOx reduction agent AUS 32: ⎯

Part 1: Quality requirements



Part 2: Test methods

The following parts are under preparation: ⎯

Part 3: Packaging, transportation and storage



Part 4: Refilling interface

Annexes A, B and C are for information only.

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ISO 22241-1:2006(E)

Introduction In order to protect the environment, keeping the air quality as clean as possible, exhaust emissions regulations around the world have been strengthened considerably. In motor vehicles with diesel engines, particulate matters (PM) and nitrogen oxide (NOx) emissions are the main concern, and efforts have been focused on the development of technology which can reduce them effectively with minimum fuel economy penalty. Selective catalytic reduction (SCR) converters using urea solution as the reduction agent is considered to be a key technology for reducing NOx emissions. The quality of the urea solution used for that technology needs to be specified to ensure reliable and stable operation of the SCR converter systems. The ISO 22241 series provides the specifications for quality characteristics, for handling, transportation and storage and for the refilling interface as well as the test methods, needed by the manufacturers of motor vehicles and their engines, by converter manufacturers, by producers and distributors of the urea solution and by fleet operators. The urea solution as specified in this part of ISO 22241 is commercially available, e.g. under the registered trademark AdBlue®. ISO takes no position concerning the evidence, validity and scope of this trademark right. Licensees of the trademark AdBlue® have committed themselves to comply with the requirements of this part of ISO 22241. The holder of this trademark right has assured ISO that he is willing to negotiate licenses under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of this trademark right is registered with ISO. Information may be obtained from: VDA - Verband der Automobilindustrie e.V. 60325 Frankfurt/M Germany This information is given for the convenience of the users of this International Standard and does not constitute an endorsement of the trademark.

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INTERNATIONAL STANDARD

ISO 22241-1:2006(E)

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

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Scope

This part of ISO 22241 specifies the quality characteristics of the NOx reduction agent AUS 32 (aqueous urea solution) which is needed to operate converters with selective catalytic reduction, so-called SCR (selective catalytic reduction) converters, in motor vehicles with diesel engines. SCR converters are particularly suitable for selectively reducing the nitrogen oxide (NOx) emissions of diesel engines. In the remaining parts of ISO 22241, the term “NOx reduction agent AUS 32” will be abbreviated to “AUS 32”.

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Normative references

The following referenced documents are indispensable for the application 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 3675, Crude petroleum and liquid petroleum products — Laboratory determination of density — Hydrometer method ISO 4259, Petroleum products — Determination and application of precision data in relation to methods of test ISO 12185, Crude petroleum and petroleum products — Determination of density — Oscillating U-tube method ISO 22241-2, Diesel engines — NOx reduction agent AUS 32 — Part 2: Test methods

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Terms and definitions

For the purposes of this document, the following terms and definitions apply. 3.1 NOx reduction agent AUS 32 aqueous urea solution, manufactured from technically pure urea – with no addition (see NOTE) of any other substances – and pure water, having a urea content of 32,5 % and with the quality characteristics defined in Clause 5 NOTE

With the possible exception of a tracer in accordance with the requirement in Table 1.

3.2 technically pure urea industrially produced grade of urea with traces of biuret, ammonia and water only, free of aldehydes or other substances such as anticaking agent, and free of contaminants such as sulphur and its compounds, chloride, nitrate or other compounds NOTE For the contaminants mentioned above, which are not a result of the urea production process, limit values and analytical methods are not considered, as this definition excludes urea grades usually used in agriculture, which might contain such chemical compounds.

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ISO 22241-1:2006(E)

3.3 pure water grade of water, produced for example by single distillation, by de-ionization, by ultra-filtration or by reverse osmosis NOTE

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This is based on the definition of water grade 3 of ISO 3696.

Designation

AUS 32, in compliance with the requirements of this International Standard, shall be designated with the code AUS 32 and the reference number of this series of International Standards:

AUS 32 ISO 22241

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Requirements and testing

The quality characteristics of the AUS 32 are specified in Table 1. They shall be continuously monitored by the manufacturer following a valid testing plan. Compliance with the limits specified in Table 1 shall be verified with the test methods indicated. NOTE 1

See Annex A with respect to the chemical characteristics of urea and the physical properties of AUS 32.

NOTE 2

See Annex B with respect to precision of the test methods.

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Handling, transportation and storage

Recommendations for the logistics chain from the factory to the vehicle, in order to maintain the high quality of the product, are given in Annex C. NOTE Requirements and recommendations for handling, transportation and storage will be specified in ISO 22241-3 which, once published, will replace Annex C.

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Marking

Distribution pumps and containers for the distribution of AUS 32, in compliance with the requirements of this part of ISO 22241, shall be marked with the designation as specified in Clause 4.

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