Marine Installation Manual
2021-08
1-6
1 Engine Summary
1.3 Fuel operating modes
X72DF
1.3
Fuel operating modes
The engine is designed for continuous service on gas fuel with fuel oil as a back-
up fuel. Different operating modes are available within specific engine power
ranges (see
). The fuel split ranges are shown in
.
The following list includes the operating modes of the X-DF engine:
•
Gas mode
•
Diesel mode
•
If contracted, fuel sharing mode
Changeover between the operating modes:
•
Transfer (automatically active for changeover to, or between, modes with
gas operation)
•
Gas trip (immediate action, always available while a mode with gas opera
-
tion is selected)
Figure 1
-
3 Operating modes of the X-DF engine
Table 1
-
5
Fuel split (energy-based) for different operating modes
NOTE
To have the fuel sharing mode available, it must be requested and in
-
cluded in the contract.
Gas mode operation:
with
≤
1% nominal MGO/MDO pilot fuel and
≥
99% gas
(both by energy)
Diesel mode operation:
100% MGO/MDO/HFO
Fuel sharing mode operation: 5-50% MGO/MDO/HFO
50-95% gas
NOTE
It is strongly recommended that transfer and operation in gas mode be
initiated above the Barred Speed Range (BSR). As a result this may in
-
crease the lower limit value above 10%.
SM-0304
0
10
20
30
40
50
60
70
80
90
100
110
Power [%]
Gas mode
Fuel sharing mode (if contracted)
Transfer
Diesel mode
Overload
ST
OP
DEAD SL
OW
SL
OW
HALF
FULL
SEA SPEED
