Marine Installation Manual 2021-08 1-4
1 Engine Summary
1.2 Primary engine data
X72DF
1.2.1 Engine rating field - rating points
The specific values for the four corners of the rating field are called rating points
(see Table 1-3).
Table 1-3 Rating points
Bore x stroke: 720 x 3,086 [mm]
No. of
cyl.
R1 R2 R3 R4
Power [kW]
5 16,125 13,425 12,500 10,400
6 19,350 16,110 15,000 12,480
7 22,575 18,795 17,500 14,560
8 25,800 21,480 20,000 16,640
Speed [rpm]
All cyl. 89 89 69 69
Brake Specific Gas Consumption (BSGC) [g/kWh] 100% power, gas mode
All cyl. 142.3 137.2 144.3 139.2
Brake Specific Pilot fuel Consumption (BSPC) [g/kWh] 100% power, gas mode
All cyl. 0.8 1.0 0.8 1.0
Brake Specific Energy Consumption (BSEC) [kJ/kWh] 100% power, gas mode
All cyl. 7,148 6,905 7,247 7,003
Brake Specific Fuel Consumption (BSFC) [g/kWh] 100 % power, diesel mode
All cyl. 182.0 180.0 182.0 180.0
Mean effective pressure (MEP) [bar]
All cyl. 17.3 14.4 17.3 14.4
Lubricating oil consumption (for fully run-in engines under normal operating conditions)
System oil approx. 8 kg/cyl per day
Cylinder oil guide feed rate 0.6g/kWh
BSGC data are quoted for gas of lower calorific value (LHV
LNG
) 50 MJ/kg
BSPC data are quoted for fuel of lower calorific value (LHV
MDO
) 42.7MJ/kg
BSEC is calculated as BSGC x LHV
LNG
+ BSPC x LHV
MDO
BSFC data are quoted for fuel of lower calorific value 42.7 MJ/kg
All other reference conditions refer to ISO standard (ISO 3046-1)
For BSFC and BSEC the following tolerances are to be taken into account:
+5 % for 100-85 % engine power
+6 % for < 85-65 % engine power
+7 % for < 65-50 % engine power
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