ISO 18611-1:2014

INTERNATIONAL ISO
STANDARD 18611-1
First edition
2014-10-01
Ships and marine technology —
Marine NOx reduction agent AUS 40 —
Part 1:
Quality requirements
Navires et technologie marine — Agents réducteurs NOx marins AUS
40 —
Partie 1: Exigences de qualité
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 Terms and definitions . 1
4 Designation . 2
5 Requirements and testing . 2
6 Marking . 3
Annex A (informative) Chemical characteristics. 4
Annex B (informative) Precision of test methods . 5
Bibliography . 6
Foreword
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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 of urea solution for quality characteristics,
handling, transportation, and storage, as well as the test methods needed by manufacturers of SCR
converters, by engine manufacturers, by producers, distributors, 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 18611-1:2014(E)
Ships and marine technology — Marine NOx reduction
agent AUS 40 —
Part 1:
Quality requirements
1 Scope
This part of ISO 18611 specifies the quality characteristics of the marine NOx reduction agent, aqueous
urea solution at 40 % concentration (AUS 40), which is needed to operate so-called SCR (selective
catalytic reduction) converters. In marine applications, for example, for engine exhaust gas treatment,
SCR converters are particularly suitable for selectively reducing the nitrogen oxide (NOx) emissions of
...