Please consider following boundary conditions for
the SCR operation:
▪ Temperature control of temperature turbine out-
let:
– By adjustable waste gate (attached to
engine).
– Set point 320 °C as minimum temperature
for active SCR.
– Set point 290 °C as minimum temperature
for deactivated SCR.
▪ Fuel:
– In line with MAN Diesel & Turbo specifica-
tion, maximum 3.5 % sulfur content.
▪ SCR active in following range:
– 10 °C (arctic) up to 45 °C (tropic) intake air
temperature.
– In the range of 25 % to 100 % engine load.
▪ IMO requirements for handling of SCR opera-
tion disturbances:
– In case of SCR malfunction IMO regulations
allow that the system will be turned off and
the ship's journey will be continued to the
port of destination. There, the ship needs to
be repaired, if the emission limits of the har-
bor/sea area would be exceeded.
Accordingly, the vessel may leave a port in
case it will only sail in areas requiring IMO II,
even if the SCR system is still out of service.
▪ Differential pressure Δp SCR (normal operation):
– Max. 20 mbar.
For the design of the complete exhaust gas line,
please consider:
▪ Maximum permissible exhaust gas back pres-
sure (to be calculated from engine turbocharger
outlet to end of complete exhaust gas line):
– Max. 50 mbar (at 100 % engine load).
▪ Maximum permissible temperature drop of
exhaust gas line (to be calculated as difference
of exhaust gas temperature turbine outlet and
temperature SCR inlet):
– Max. 5 K in the range of 25 % to 100 %
engine load (calculated at 5 °C air tempera-
ture in the engine room).
▪ Recommended for exhaust gas line:
– Insulation according to SOLAS standard.
The SCR system requires high exhaust gas tem-
peratures for an effective operation. MAN Diesel
& Turbo therefore recommends to arrange the
SCR as the first device in the exhaust gas line,
followed by other auxiliaries like boiler, silencer
etc.
▪ Performance guarantee for engine plus SCR
within defined in section Boundary conditions
for SCR operation.
▪ Guarantee for engine plus SCR for marine appli-
cations to meet IMO Tier III level as defined by
IMO within defined in section Boundary condi-
tions for SCR operation (details will be handled
within the relevant contracts).
Please be aware
All statements in this document refer to MAN
Diesel & Turbo SCR systems only.
MAN Diesel & Turbo can only deliver an IMO Tier
III certificate and act as “Applicant” (within the
meaning of the IMO) if the engine plus SCR sys-
tem is supplied by MAN Diesel & Turbo.
If the engine is supplied without MAN Diesel &
Turbo SCR system, only a standard warranty for
a single engine will be given. No guarantee
regarding minimum exhaust gas temperature
after turbine or emissions after third party SCR or
suitability of the engine in conjunction with a third
party SCR system can be given.
If the engine is supplied without MAN Diesel &
Turbo SCR system, no optimisation function
within SaCoS can be applied and as maximum
exhaust gas temperature after turbine only will be
possible:
▪320 °C (25 % load – 100 % load).
MAN Diesel & Turbo
B1600 0
SCR (Selective Catalytic Reduction)
3700467-8.1
Page 4 (17)
V28/32S, L28/32S, L28/32H, L27/38S, L27/38, L23/30S, L23/30H, L21/31S,
L21/31, L16/24S, L16/24
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