IMO Tier II NO
x
emission limits
All ME, ME-B and ME-C/-GI engines are, as
standard, fulfilling the IMO Tier II NO
x
emission
requirements, a speed dependent NO
x
limit meas-
ured according to ISO 8178 Test Cycles E2/E3 for
Heavy Duty Diesel Engines.
The E2/E3 test cycles are referred to in the Extent
of Delivery as EoD: 4 06 200 Economy mode with
the options: 4 06 201 Engine test cycle E3 or 4 06
202 Engine test cycle E2.
NO
x
reduction methods for IMO Tier III
As adopted by IMO for future enforcement, the
engine must fulfil the more restrictive IMO Tier III
NO
x
requirements when sailing in a NO
x
Emission
Control Area (NO
x
ECA).
The Tier III NO
x
requirements can be met by Ex-
haust Gas Recirculation (EGR), a method which
directly affects the combustion process by lower-
ing the generation of NOx.
Alternatively, the required NO
x
level could be met
by installing Selective Catalytic Reaction (SCR),
an after treatment system that reduces the emis-
sion of NO
x
already generated in the combustion
process.
Details of MAN Diesel & Turbo’s NO
x
reduction
methods for IMO Tier III can be found in our pub-
lication:
Emission Project Guide
The publication is available at www.marine.man.
eu → ’Two-Stroke’ → ’Project Guides’ → ’Other
Guides’.
Emission Control
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