ISO 22241-3:2008
(Main)Diesel engines — NOx reduction agent AUS 32 — Part 3: Handling, transportation and storing
Diesel engines — NOx reduction agent AUS 32 — Part 3: Handling, transportation and storing
ISO 22241-3:2008 describes best practice recommendations and requirements for handling, transportation and storing of NOx reduction agent AUS 32 (aqueous urea solution), specified in ISO 22241-1. These recommendations and requirements are necessary to preserve the specified quality of AUS 32 from any point of production to the point where it is filled into the onboard tank of the vehicle, in order to ensure the proper function of the selective catalytic reduction (SCR) converter systems.
Moteurs diesel — Agent AUS 32 de réduction des NOx — Partie 3: Manipulation, transport et stockage
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 22241-3
First edition
2008-02-15
Diesel engines — NOx reduction agent
AUS 32 —
Part 3:
Handling, transportation and storage
Moteurs diesel — Agent AUS 32 de réduction des NOx —
Partie 3: Manipulation, transport et stockage
Reference number
ISO 22241-3:2008(E)
©
ISO 2008
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ISO 22241-3:2008(E)
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ii © ISO 2008 – All rights reserved
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ISO 22241-3:2008(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 General requirements and recommendations . 2
4.1 Requirements for the use of materials compatible with AUS 32 . 2
4.2 Physical conditions during transportation and storage. 3
4.3 Cleanness of surfaces in contact with AUS 32. 4
4.4 Recommendation on further properties. 4
5 Quality assurance. 4
5.1 General. 4
5.2 Sampling. 5
5.3 Testing . 5
5.4 Procedures for product release and handling of non-conforming product . 5
5.5 Quality monitoring. 6
6 Procedures for handling of containers and equipment. 7
6.1 General. 7
6.2 Single use non-bulk containers . 7
6.3 Dedicated bulk operation. 7
6.4 Non-dedicated bulk operation . 8
Bibliography . 9
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ISO 22241-3:2008(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 22241-3 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 5, Engine
tests.
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
⎯ Part 3: Handling, transportation and storage
⎯ Part 4: Refilling interface
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INTERNATIONAL STANDARD ISO 22241-3:2008(E)
Diesel engines — NOx reduction agent AUS 32 —
Part 3:
Handling, transportation and storage
1 Scope
This part of ISO 22241 describes best practice recommendations and requirements for handling,
transportation and storage of NOx reduction agent AUS 32 (aqueous urea solution), specified in ISO 22241-1.
These recommendations and requirements are necessary to preserve the specified quality of AUS 32 from
any point of production to the point where it is filled into the onboard tank of the vehicle, in order to ensure the
proper function of the selective catalytic reduction (SCR) converter systems.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. The latest edition of the referenced documents (including any
amendments) applies.
ISO 22241-1:2006, Diesel engines — NOx reduction agent AUS 32 — Part 1: Quality requirements
ISO 22241-2:2006, Diesel engines — NOx reduction agent AUS 32 — Part 2: Test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
shelf life
period of time starting with the completion of the production of the batch in which AUS 32, stored under
specific conditions, remains within the specifications defined in ISO 22241-1:2006, Table 1
3.2
production batch of AUS 32
quantity of AUS 32 produced at one operation at a site where the product has (last) been physically or
chemically modified to reach compliance with the specifications defined in ISO 22241-1:2006, Table 1
NOTE Mixing of AUS 32 volumes does not constitute a physical or chemical modification, so long as the quality of
the volumes before mixing complies with the specifications given in ISO 22241-1.
3.3
bulk operation
handling of AUS 32 in large containers
NOTE Examples of large containers are road tankers, rail cars, storage tanks and tank vessels.
3.4
packaged shipment
handling of AUS 32 in small containers
NOTE Examples of small containers are drums, cans, bottles, intermediate bulk containers (IBCs) and totes.
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ISO 22241-3:2008(E)
4 General requirements and recommendations
4.1 Requirements for the use of materials compatible with AUS 32
4.1.1 General
To avoid contamination of AUS 32 and to resist corrosion of the devices used (containers, tubes, valves,
fittings, gaskets, hoses, etc.), all materials in direct contact with AUS 32 during handling, transportation and
storage, including sampling, shall be compatible with AUS 32.
It is the responsibility of the user of this part of ISO 22241 to ensure that the correct materials are used. The
list of the materials given in Tables 1 and 2 shall be used for guidance only until such time as more definitive
information is established.
Any material with uncertain compatibility with AUS 32 shall be tested. The test conditions should reflect the
intended temperature range and contact time, in order to evaluate possible influences on the product quality
as specified in ISO 22241-1. In addition, this test shall ensure that the integrity of the material in contact with
AUS 32 is maintained. Accelerated tests using higher temperatures may be used, as appropriate.
If a contamination of AUS 32 is detected during handling, transportation and storage, an investigation shall be
carried out to determine the causes of contamination and to take appropriate corrective actions.
4.1.2 Recommended materials
Examples of materials recommended for use with AUS 32 are given in Table 1.
NOTE This list has been compiled in accordance with the state of the art and with the best knowledge at the time of
publication of this part of ISO 22241.
Table 1 — Examples of recommended materials
Highly alloyed austenitic Cr-Ni-steels and Cr-Ni-Mo-steels, for example in accordance with EN 10088-1,
EN 10088-2 and EN 10088-3 (i.e. 1.4541 and 1.4571), or stainless steel 304 (S30400), 304L (S30403),
316 (S31600) and 316L (S31603) in accordance with ASTM A240, ASTM A276 and ASTM A312
Titanium
Ni-Mo-Cr-Mn-Cu-Si-Fe alloys, e.g. hastelloy c/c-276
Polyethylene, free of additives
Polypropylene, free of additives
Polyisobutylene, free of additives
Perfluoroalkoxyl alkane (PFA), free of additives
Polyfluoroethylene (PFE), free of additives
Polyvinylidenefluoride (PVDF), free of additives
Polytetrafluoroethylene (PTFE), free of additives
Copolymers of vinylidenefluoride and hexafluoropropylene, free of additives
NOTE 1 The sequence given in this list does not constitute a ranking of the recommended materials.
NOTE 2 Materials made of plastics can contain various kinds of additives used either for processing or for special
kinds of serviceability. These additives can possibly migrate into AUS 32. For this reason, it is advisable that special
care be taken for testing the contamination of AUS 32 by additives from plastic materials used in direct contact with
AUS 32.
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ISO 22241-3:2008(E)
4.1.3 Materials not recommended
Examples of materials not recommended are given in Table 2.
NOTE This list has been compiled in accordance with the state of the art and with the best knowledge at the time of
publication of this part of ISO 22241.
Table 2 — Examples of materials not recommended
Materials forming compounds as a result of reaction with ammonia, which may negatively interfere with
the SCR converter system: carbon steels, zinc coated carbon steels, mild iron
Non ferrous metals and alloys: copper, copper alloys, zinc, lead
Solders containing lead, silver, zinc or copper
Aluminium, aluminium alloys
Magnesium, magnesium alloys
Plastics or metals coated with nickel
4.2 Physical conditions during transportation and storage
4.2.1 General recommendation
In order to avoid any impairment of the AUS 32 quality during transportation and storage, the following
conditions should be taken into account:
⎯ in order to prevent decomposition of the urea, as well as the evaporation of water in the case of vented
containers, prolonged transportation or storing above 25 °C should be avoided;
NOTE 1 Insulation can be required for transportation vehicles.
NOTE 2 Prolonged storage at temperatures above 25 °C can reduce the shelf life (see Table 3). However,
temporary exposure to higher temperatures does not necessarily influence the quality of AUS 32.
⎯ in order to prevent solidification of AUS 32, storage below −5 °C should be avoided;
NOTE 3 Insulation or means of heating the AUS 32 can be required for transportation vehicles.
NOTE 4 Solidified AUS 32 has an approximately 7 % larger volume than the liquid and, therefore, can cause a
fully filled, closed container to burst. Solidified AUS 32, which has been warmed up carefully at temperatures not
exceeding 30 °C will not be impaired in quality and can be used as soon as the warmed up solution is free from solids.
⎯ in order to avoid excessive temperature rise, AUS 32 should be protected from sunlight;
⎯ in order to protect AUS 32 from any contamination carried by the air, well-closed containers or vented
containers with filters should be used.
4.2.2 Shelf life
Throughout the entire distribution chain, AUS 32 is expected to remain within the specifications given in
ISO 22241-1 for at least the time periods specified in Table 3 as a function of the constant ambient
temperature at which the AUS 32 is stored.
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ISO 22241-3:2008(E)
Table 3 — Shelf life as a function of temperature
Constant ambient storage temperature Minimum shelf life
° C months
u 10 36
a
u 25 18
u 30 12
u 35 6
b
> 35 —
NOTE The main factors taken into account to define the shelf life in this table are the ambient storage
temperature and the initial alkalinity of AUS 32. The differenc
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