The purpose of NOx regulations is to reduce the emission of nitrogen oxide (NOx) from ships since it contributes to air pollution ashore and to algal bloom in the sea.
NOx reguleringen indeholder tre niveauer, Tier I, Tier II og Tier III.
The NOx regulations includes three levels Tier I, Tier II and Tier III.
Tier I entered into force on the 1 January 2000;
Tier II entered into force on the 1 January 2011;
Tier III entered into force on the 1 January 2016 in the North American and the United States Caribbean ECA areas; andenters into force on the 1 January 2021 in the ECA areas covering the North Sea and the Baltic Sea.These ECA areas includes the Baltic Sea, the Danish waters, Kattegat, Skagerrak, the Channel and the North Sea south of 62° north latitude and east of 4° west longitude.
Tier | Ship constructed on or after | Total weighted cycle emission limit (g/kWh) n = engine’s rated speed (rpm) | ||
n < 130 | n = 130 – 1999 | n ≥ 2000 | ||
I | January 1, 2000 | 17.0 | 45·n(-0.2) e.g., 720 rpm – 12.1 | 9.8 |
II | January 1, 2011 | 14.4 | 44·n(-0.23) e.g., 720 rpm – 9.7 | 7.7 |
III In the North American and the United States Caribbean sea area | January 1, 2016 | 3.4 | 9·n(-0.2) e.g., 720 rpm – 2.4 | 2.0 |
III In the North Sea and the Baltic sea | January 1, 2021 | 3.4 | 9·n(-0.2) e.g., 720 rpm – 2.4 | 2.0 |
The requirement apply to each marine diesel engine with a power output of more than 130 kW installed on a ship and each marine diesel engine with a power output of more than 130 kW which has undergone a major conversion.
The requirement do apply also to marine diesel engines which is installed in existing ships on the dates specified in the table as well as for major conversions of engines e.g. if the output of the engine is changed outside the limits in the NOx approval or if the fuel injection system is changed. Replacement of an engine with an identical engine are exempted from the new requirements.
What does this mean?
For ships with trade permission covering the North American and the United States Caribbean ECA areas the tier III requirements apply for marine diesel engines with an output of 130 kW or higher for ships constructed on or after the 1 January 2016 as well as for new engines installed in all ships on or after the 1. January 2016.
For ships trading in the North Sea and the Baltic Sea ECA areas the tier III requirements apply for marine diesel engines with an output of 130 kW or higher for ships constructed on or after the 1 January 2021 as well as for new engines installed in all ships on or after the 1. January 2021. The requirements further apply to major conversions e.g. if the output of the engine is changed outside the limits in the NOx approval or if the fuel injection system is changed. Replacement of an engine with an identical engine are exempted from the new requirements.
How to do
For Danish ships sailing to ports outside Denmark, the tier III requirements must be documented by the ships EIAPP certificate, IAPP certificate, the technical file as required in MARPOL Annex VI and the NOx Technical Code Chapter 2 part 2.2.5.
For Danish ships exclusively sailing to and from Danish ports the tier III requirements can be documented by the engines type approval certificate (International IMO certificates is not necessary).
