Marine Installation Manual
2022-03
1-14
1 Engine Summary
1.3 Fuel operating modes
X62DF-S2.0
iCER diesel Tier III mode
The iCER diesel Tier III mode is available from 0 to 100% engine power and the
iCER is active from approximately 20 to 100 % engine power. This engine oper
-
ation mode uses MGO pilot fuel (with maximum 0.10% m/m sulphur), resulting
in the engine reaching Tier III compliance.
The iCER system (see section
) when in diesel mode requires the acti
-
vation of the iCER water treatment system (which is not the case when in gas
mode). For further information, please see the
Arrangement of the iCER drainage
system for installations which include iCER diesel Tier III mode operation,
1.3.3
Operation in a mixed fuel mode
A mixed fuel mode runs on both gas and liquid fuel at the same time. The power
available and the diesel fuel ratio is dependent on the selected mixed fuel mode.
Combustion stability mode
The Combustion Stability Mode (CSM) technology is specific to the engines of
the X-DF2.0 portfolio and can be selected as an operating mode across the same
engine power range as gas mode (see
). When the CSM is se
-
lected, the engine will run mainly on gas fuel, however without the iCER.
The CSM can be active at as low as approximately 10 % CMCR power. From
10 % and up to less than 26 % CMCR power, only gas fuel is applied. Starting
from 26% CMCR power, a part of the gas fuel is replaced with liquid fuel to en
-
sure stable combustion. Depending on the engine rating, it is possible that the
26 % CMCR power limit may vary slightly by a few percentage points.
Figure 1
-
9 Diesel fuel ratio during active CSM
The CSM, like the FSM, injects liquid fuel by the main injectors, in addition to
the gas fuel. However, unlike FSM, the diesel fuel ratio is set by the CSM as
shown in
.
SM-0621
50
100
100
0
0
50
Engine Power [%]
Diesel fuel ratio [%]
25
CSM ratio
