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 Figure 1-3). The fuel split ranges are shown in Table 1-5.
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
STOP
DEAD SLOW
SLOW
HALF
FULL
SEA SPEED
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