ISO 18611-3:2014

INTERNATIONAL ISO
STANDARD 18611-3
First edition
2014-10-01
Ships and marine technology —
Marine NOx reduction agent AUS 40 —
Part 3:
Handling, transportation and storage
Navires et technologie marine — Agents réducteurs NOx marins AUS
40 —
Partie 3: Manipulation, transport et stockage
Reference number
ISO 18611-3:2014(E)
©
ISO 2014

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ISO 18611-3:2014(E)

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© ISO 2014
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ISO 18611-3:2014(E)

Contents Page
Foreword .iv
Introduction .v
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 40 . 2
4.2 Physical conditions during transportation and storage . 3
4.3 Cleanness of surfaces in contact with AUS 40 . 4
4.4 Recommendation on further properties. 4
5 Quality assurance . 5
5.1 General . 5
5.2 Sampling . 5
5.3 Quality verification . 5
5.4 Procedures for product release and handling of non-conforming product. 6
5.5 Quality assurance. 6
6 Procedures for handling of containers and equipment . 7
6.1 General . 7
6.2 Dedicated bulk operation . 7
6.3 Non-dedicated bulk operation. 7
Bibliography . 9
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ISO 18611-3:2014(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.
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
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 8, Ships and marine technology, Subcommittee
SC 2, Marine environment protection.
ISO 18611 consists of the following parts, under the general title Ships and marine technology — Marine
NOx reduction agent AUS 40:
— Part 1: Quality requirements
— Part 2: Test methods
— Part 3: Handling, transportation and storage
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ISO 18611-3:2014(E)

Introduction
In order to protect the environment and to enhance air quality, exhaust emissions regulations around
the world are continuously strengthened. For ships with large combustion engines, particulate matter
(PM), nitrogen oxide (NOx) emissions, and sulfur dioxide emissions are the main concern, and efforts
have been focused on the development of technology that can reduce them effectively with minimum fuel
economy penalty. Selective catalytic reduction (SCR) converters using a urea solution as the reducing
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 18611 series provides the specifications for quality characteristics, for handling,
transportation, and storage, as well as the test methods needed by manufacturers of SCR converters, by
engine producers, by producers, distributors of the urea solution, and by fleet operators/ship owners.
Efficient expanding of the use of urea SCR technology requires a consolidated framework that can be
followed by producers, end users, OEMs, and catalyst suppliers.
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INTERNATIONAL STANDARD ISO 18611-3:2014(E)
Ships and marine technology — Marine NOx reduction
agent AUS 40 —
Part 3:
Handling, transportation and storage
1 Scope
This part of ISO 18611 describes best practice recommendations and requirements for handling,
transportation, and storage of NOx reduction agent AUS 40 (aqueous urea solution), specified in
ISO 18611-1. These recommendations and requirements are necessary to preserve the specified quality
of AUS 40 from any point of production to the point where it is filled into the on-board tank of the vehicle,
in order to ensure the proper function of the selective catalytic reduction (SCR) converter systems.
This International Standard is covering quality requirements and guidelines for AUS 40 for marine
applications, irrespective of manufacturing method or technique.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 18611-1, Ships and marine technology — Marine NOx reduction agent AUS 40 — Part 1: Quality
requirements
ISO 18611-2, Ships and marine technology — Marine NOx reduction agent AUS 40 — Part 2: Test Methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
bulk operation
handling of AUS 40 in large containers
Note 1 to entry: Examples of large containers are road tankers, rail cars, storage tanks, and tank vessels.
3.2
packaged shipment
handling of AUS 40 in small containers
Note 1 to entry: Examples of small containers are drums, cans, bottles, intermediate bulk containers (IBCs).
3.3
production batch of AUS 40
quantity of AUS 40 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 18611-1
Note 1 to entry: Mixing of AUS 40 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 18611-1.
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ISO 18611-3:2014(E)

3.4
shelf life
period of time starting with the completion of the production of the batch in which AUS 40, stored under
specific conditions, remains within the specifications defined in ISO 18611-1, Table 1
4 General requirements and recommendations
4.1 Requirements for the use of materials compatible with AUS 40
4.1.1 General
To avoid contamination of AUS 40 and to resist corrosion of the devices used (containers, tubes, valves,
fittings, gaskets, hoses, etc.), all materials in direct contact with AUS 40 during handling, transportation,
and storage, including sampling, shall be compatible with AUS 40.
It is the responsibility of the user of this International Standard 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 40 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 this International Standard. In addition, this test shall ensure that the integrity of
the material in contact with AUS 40 is maintained. Accelerated tests using higher temperatures can be
used, as appropriate.
If a contamination of AUS 40 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.
NOTE Choice of materials for the purpose of storing/distributing AUS40 on-board a vessel might be subject
to special authority and /or certification body requirements.
4.1.2 Recommended materials
Examples of materials recommended for use with AUS 40 are given in Table 1.
NOTE This list has been compiled in accordance with best available knowledge about state-of-the-art
materials at the time of publication of this part of ISO 18611.
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
Polytetrafluoroethylene (PTFE), 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 40. For this reason, it is advisable that special care be taken for
testing the contamination of AUS 40 by additives from plastic materials used in direct contact with AUS 40.
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ISO 18611-3:2014(E)

Table 1 (continued)
Copolymers of vinylidenefluoride and hexafluoropropylene, free of additives
FIBREGLASS based on a proper resin
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 40. For this reason, it is advisable that special care be taken for
testing the contamination of AUS 40 by additives from plastic materials used in direct contact with AUS 40.
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 best available knowledge about state-of-the-art
materials at the time of publication of this part of ISO 18611.
Table 2 — Examples of materials not recommended
Materials forming compounds as a result of reaction with ammonia, which might 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 40 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, especially in hot areas of the world.
NOTE 2 In hot areas of the world where there is a real risk of recommended long-term storage temperatures
being exceeded, temperature monitoring of the AUS 40 is recommended.
NOTE 3 Prolonged storage at temperatures
...