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
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. 8kg/cyl per day
Cylinder oil
guide feed rate 0.6g/kWh
BSGC data are quoted for gas of lower calorific value (LHV
LNG
) 50MJ/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 42.7MJ/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
