ISO 18611-2:2014
(Main)Ships and marine technology — Marine NOx reduction agent AUS 40 — Part 2: Test methods
Ships and marine technology — Marine NOx reduction agent AUS 40 — Part 2: Test methods
ISO 18611-2:2014 specifies test methods required for the determination of the quality characteristics of the NOx reduction agent AUS 40 (aqueous urea solution) specified in ISO 18611-1. In the remaining parts of ISO 18611, the term "NOx reduction agent AUS 40" will be abbreviated to "AUS 40". This International Standard is covering quality requirements and guidelines for AUS 40 for marine applications, irrespective of manufacturing method or technique.
Navires et technologie marine — Agents réducteurs NOx marins AUS 40 — Partie 2: Méthodes d'essai
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 18611-2
First edition
2014-10-01
Ships and marine technology —
Marine NOx reduction agent AUS 40 —
Part 2:
Test methods
Navires et technologie marine — Agents réducteurs NOx marins AUS
40 —
Partie 2: Méthodes d’essai
Reference number
©
ISO 2014
© ISO 2014
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ii © ISO 2014 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Specifications . 1
4 Sampling . 1
5 Precision and dispute . 2
5.1 General . 2
5.2 Repeatability, r .2
5.3 Reproducibility, R .2
Annex A (normative) Sampling . 3
Annex B (normative) Determination of urea content by total nitrogen . 5
Annex C (normative) Refractive index and determination of urea content by refractive index .9
Annex D (normative) Determination of alkalinity .13
Annex E (normative) Determination of biuret content .16
Annex F (normative) Determination of aldehyde content .21
Annex G (normative) Determination of insoluble matter content by gravimetric method
.....................25
Annex H (normative) Determination of phosphate content by photometric method .28
Annex I (normative) Determination of trace element content (Ca, Fe, K, Mg, Na) by ICP-
OES method .34
Annex J (informative) Determination of identity by FTIR spectrometry method .40
Annex K (informative) Precision of test methods .43
Bibliography .44
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
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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
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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
iv © ISO 2014 – All rights reserved
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.
INTERNATIONAL STANDARD ISO 18611-2:2014(E)
Ships and marine technology — Marine NOx reduction
agent AUS 40 —
Part 2:
Test methods
1 Scope
This part of ISO 18611 specifies test methods required for the determination of the quality characteristics
of the NOx reduction agent AUS 40 (aqueous urea solution) specified in ISO 18611-1. In the remaining
parts of ISO 18611, the term “NOx reduction agent AUS 40” will be abbreviated to “AUS 40”.
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 3675, Crude petroleum and liquid petroleum products — Laboratory determination of density —
Hydrometer method
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 4259, Petroleum products — Determination and application of precision data in relation to methods of
test
ISO 5661, Petroleum products — Hydrocarbon liquids — Determination of refractive index
ISO 5667-3, Water quality — Sampling — Part 3: Preservation and handling of water samples
ISO 12185, Crude petroleum and petroleum products — Determination of density — Oscillating U-tube
method
3 Specifications
Compliance with the limits specified in ISO 18611-1, Table 1 shall be determined by the test methods
specified in Annexes B through J of this part of ISO 18611. Determination of the density shall be conducted
in accordance with ISO 3675 or ISO 12185.
NOTE For the purposes of this International Standard, the terms “%(m/m)” and “%(V/V)” are used to
represent the mass fraction and the volume fraction of a material respectively.
4 Sampling
Samples shall be taken in accordance with Annex A.
5 Precision and dispute
5.1 General
All test methods referred to in this part of ISO 18611 include a precision statement according to ISO 4259.
In cases of dispute, the procedures described in ISO 4259 shall be used for resolving the dispute, and
interpretation of the results based on the test method precision shall be used. The test methods described
in this International Standard has been adopted from ISO 22241-2. Some minor changes have been made
to the ISO 22241 test methods in order to adapt it to the specifications as described in ISO 18611-1, Table
1.
The precision of the test methods has been adopted from ISO 22241-2. In ISO 22241-2, the precision was
determined by statistical examination in accordance with ISO 4259 with the exception of the methdods
for determination of density that was taken from ISO 3675 and ISO 12185. The precision of the test
methods is specified in each annex. Additionally, this information is summarized in Annex K for all test
methods for the convenience of the user of this part of ISO 18611.
The statistical significance of the precision quoted in this part of ISO 18611 is generically defined in 5.2
and 5.3, in which the “xx (unit)” stands for the repeatability and reproducibility in question.
5.2 Repeatability, r
The difference between two test results obtained by the same operator with the same apparatus under
constant operating conditions on identical test material should, in the long run, in the normal and correct
operation of the test method, exceed xx (unit) in only one case in 20.
5.3 Reproducibility, R
The difference between two single and independent test results obtained by different operators working
in different laboratories on identical test material would, in the long run, in the normal and correct
operation of the test method, exceed xx (unit) in only one case in 20.
2 © ISO 2014 – All rights reserved
Annex A
(normative)
Sampling
A.1 General
The sampling method specified in this annex is valid for each sampling of AUS 40 throughout the supply
chain after the shipment from the manufacturer’s site to the AUS 40 containers on board the vessels.
A.2 Principle
The limits for the quality characteristics of AUS 40, which are specified in ISO 18611-1, are the
representative analytical results that can only be obtained when the sample is protected from any
contamination before the analysis.
Therefore, suitable bottles shall be used for sampling, which do not contaminate the sample, especially
regarding the trace elements, and which minimize the risk of algae or bacteria growth.
NOTE The sampling method specified in this annex is based on ISO 5667-2 and ISO 5667-3.
A.3 Possible contaminants
During the sampling process, foreign matter may lead to contamination of the sample. Under realistic
conditions, the following sources of contamination will pose a major hazard:
— residues of process aids used for the production of the sampling bottles;
— contaminants which have been deposited in the empty bottles during the time they are stored
empty;
— contaminants from the air, i.e. dust or any foreign matter from the surrounding, during the sampling;
— residues of cleaning agents, which have been used for cleaning the sampling equipment and the
bottles as well;
— fuel.
A.4 Apparatus
A.4.1 Sampling bottles
1000-ml wide neck bottles shall be used. Suitable materials for these bottles are HD-polyethylene, HD-
polypropylene, polyfluorethylene, polyvinylidenedifluoride, and tetrafluoroethylene-perfluoroalky
vinyl ether copolymer (PFA). In case of dispute, PFA bottles should be used.
Prior to the first use with AUS 40, the bottles shall be cleaned
...
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