WÄRTSILÄ WARTSILA32, Product Manual, Page: 175 / 254

NOTE
The Dual Fuel engines fulfil the IMO Tier 3 NOx emission level as standard in gas
mode operation without the need of a secondary exhaust gas emission control
system.
Sulphur Oxides, SO
x
emissions
Marpol Annex VI has set a maximum global fuel sulphur limit of currently 3,5% (from 1.1.2012)
in weight for any fuel used on board a ship. Annex VI also contains provisions allowing for
special SOx Emission Control Areas (SECA) to be established with more stringent controls on
sulphur emissions. In a SECA, which currently comprises the Baltic Sea, the North Sea, the
English Channel, the US Caribbean Sea and the area outside North America (200 nautical
miles), the sulphur content of fuel oil used onboard a ship must currently not exceed 0,1 %
in weight.
The Marpol Annex VI has undertaken a review with the intention to further reduce emissions
from ships. The current and upcoming limits for fuel oil sulphur contents are presented in the
following table.
Table 13-2 Fuel sulphur caps
Date of implementation Area Fuel sulphur cap
1 January 2012 Globally Max 3.5% S in fuel
1 January 2015 SECA Areas Max. 0.1% S in fuel
1 January 2020 Globally Max. 0.5% S in fuel
Abatement technologies including scrubbers are allowed as alternatives to low sulphur fuels.
The exhaust gas system can be applied to reduce the total emissions of sulphur oxides from
ships, including both auxiliary and main propulsion engines, calculated as the total weight of
sulphur dioxide emissions.
Wärtsilä 32 Product Guide - a21 - 7 September 2016 13-5
13. Exhaust Emissions Wärtsilä 32 Product Guide