S80ME-C
198 43 95-7.1
MAN B&W Diesel A/S
6.04
Page 3 of 12
Calculation of List of Capacities for Derated Engine
Example 1:
Pump and cooler capacities for a derated 6S80ME-C with high efficiency MAN B&W turbocharger,
type TCA with fixed pitch propeller and central cooling water system.
Nominal MCR, (L
1
)
P
L1
: 23,280 kW (100.0%) and76.0 r/min (100.0%)
Specified MCR, (M)
P
M
: 18,624 kW (80.0%) and 68.4 r/min (90.0%)
Matching point, (O)
P
O
: 16,762 kW (72.0%) and 66.0 r/min (86.9%), P
O
= 90.0% of
PM
The method of calculating the reduced capacities
for point M (n
M%
= 90.0 and P
M%
= 80.0) is shown
below.
The values valid for the nominal rated engine are
found in the ‘List of Capacities’, Figs. 6.03.01 and
6.03.02, and are listed together with the result in
the figure on the next page.
Heat dissipation of scavenge air cooler
Fig. 6.04.01 which approximate indicates a Q
air%
=
75.0% heat dissipation, and corrected for match-
ing point O lower than M, by applying correcting
factor k
O
, equal 75.0 x (1 + 0.27 x (1 – 0.900)) = 77.0%
i.e.:
Q
air,M
=Q
air,L1
x Q
air%
/ 100
Q
air,M
= 9,090 x 0.770 = 6,999 kW
Heat dissipation of jacket water cooler
Fig. 6.04.02 indicates a Q
jw%
= 84.2% heat dissipa-
tion; i.e.:
Q
jw,M
= Q
jw,L1
x Q
jw%
/ 100
Q
jw,M
= 3,430 x 0.842 = 2,888 kW
Heat dissipation of lube oil cooler
Fig. 6.04.03 indicates a Q
lub%
= 91.2% heat dissipa-
tion; i.e.:
Q
jw,M
= Q
jw,L1
x Q
jw%
/ 100
Q
lub,M
= 1,750 x 0.912 = 1,596 kW
Heat dissipation of central water cooler
Q
cent,M
= Q
air,M
+ Q
jw,M
+ Q
lub, M
Q
cent,M
= 6,999 + 2,888 + 1,596 = 11,483 kW
Scavenge air coolers:
V
cw,air,M
= V
cw,air,L1
x Q
air%
/ 100
V
cw,air,M
= 306 x 0.770 = 236 m
3
/h
Cooling water flow through lubricating oil cooler:
V
cw,lub,M
= V
cw,lub,L1
x Q
lub%
/ 100
V
cw,lub,M
= 244 x 0.912 = 223 m
3
/h
Cooling water flow through central cooler (Central
cooling water pump):
V
cw,cent,M
= V
cw,air,M
+ V
cw,lub,M
V
cw,cent,M
= 236 + 223 = 459 m
3
/h
Cooling water flow through jacket water cooler (as
for lube oil cooler):
V
cw,jw,M
= V
cw,lub,M
V
cw,jw,M
= 223 m
3
/h
Seawater pump for central cooler
As the seawater pump capacity and the central
cooler heat dissipation for the nominal rated engine
found in the ‘List of Capacities’ are 700 m
3
/h and
14,270 kW the derated seawater pump flow equals:
Seawater pump:
V
sw,cent,M
= V
sw,cent,L1
xQ
cent,M
/Q
cent,L1
V
sw,cent,M
= 700 x 11,483 / 14,270 = 563 m
3
/h
Summary of Contents for B&W S80ME-C7
Page 4: ......
Page 10: ......
Page 15: ...MAN B W MAN Diesel Engine Design 1 ...
Page 16: ......
Page 30: ......
Page 31: ...MAN B W MAN Diesel Engine Layout and Load Diagrams SFOC 2 ...
Page 32: ......
Page 38: ......
Page 50: ......
Page 62: ......
Page 63: ...MAN B W MAN Diesel Turbocharger Choice Exhaust Gas By pass 3 ...
Page 64: ......
Page 70: ......
Page 71: ...MAN B W MAN Diesel Electricity Production 4 ...
Page 72: ......
Page 86: ...MAN B W Page of 1 MAN Diesel This section is not applicable PTO BW GCR 4 04 198 47 58 9 0 ...
Page 109: ...MAN B W MAN Diesel Installation Aspects 5 ...
Page 110: ......
Page 143: ...MAN B W MAN Diesel List of Capacities Pumps Coolers Exhaust Gas 6 ...
Page 144: ......
Page 162: ......
Page 163: ...MAN B W MAN Diesel Fuel 7 ...
Page 164: ......
Page 178: ......
Page 179: ...MAN B W MAN Diesel Lubricating Oil 8 ...
Page 180: ......
Page 198: ......
Page 199: ...MAN B W MAN Diesel Cylinder Lubrication 9 ...
Page 200: ......
Page 208: ......
Page 209: ...MAN B W MAN Diesel Piston Rod Stuffing Box Drain Oil 10 ...
Page 210: ......
Page 212: ......
Page 213: ...MAN B W MAN Diesel Central Cooling Water System 11 ...
Page 214: ......
Page 219: ...MAN B W MAN Diesel Seawater Cooling System 12 ...
Page 220: ......
Page 230: ......
Page 231: ...MAN B W MAN Diesel Starting and Control Air 13 ...
Page 232: ......
Page 238: ......
Page 239: ...MAN B W MAN Diesel Scavenge Air 14 ...
Page 240: ......
Page 249: ...MAN B W MAN Diesel Exhaust Gas 15 ...
Page 250: ......
Page 264: ......
Page 265: ...MAN B W MAN Diesel Engine Control System 16 ...
Page 266: ......
Page 275: ...MAN B W MAN Diesel Vibration Aspects 17 ...
Page 276: ......
Page 289: ...MAN B W MAN Diesel Monitoring Systems and Instrumentation 18 ...
Page 290: ......
Page 312: ......
Page 313: ...MAN B W MAN Diesel Dispatch Pattern Testing Spares and Tools 19 ...
Page 314: ......
Page 338: ......
Page 339: ...MAN B W MAN Diesel Project Suppport and Documentation 20 ...
Page 340: ......
Page 349: ...MAN B W MAN Diesel Appendix A ...
Page 350: ......