Man B&W S50ME-B9.3-TII Project Manual page 212

MAN B&W
Seawater Cooling System
The seawater cooling system is used for cooling,
the main engine lubricating oil cooler, the jacket
water cooler and the scavenge air cooler, see Fig.
12.02.01.
The lubricating oil cooler for a PTO stepup gear
should be connected in parallel with the other
coolers. The capacity of the seawater pump is
based on the outlet temperature of the seawater
being maximum 50 °C after passing through the
coolers – with an inlet temperature of maximum
32 °C (tropical conditions), i.e. a maximum tem-
perature increase of 18 °C.
The valves located in the system fitted to adjust
the distribution of cooling water flow are to be
provided with graduated scales.
Seawater
pumps
Seawater
outlet
Seawater
inlet
The letters refer to list of 'Counterflanges'
Fig. 12.02.01: Seawater cooling system
MAN B&W MC/MCC, ME/MEC/MEGI/ME-B engines
Thermostatic
valve
Seawater
inlet
MAN Diesel
The interrelated positioning of the coolers in the
system serves to achieve:
• The lowest possible cooling water inlet tem-
perature to the lubricating oil cooler in order to
obtain the cheapest cooler. On the other hand,
in order to prevent the lubricating oil from stiff-
ening in cold services, the inlet cooling water
temperature should not be lower than 10 °C
• The lowest possible cooling water inlet tempera-
ture to the scavenge air cooler, in order to keep
the fuel oil consumption as low as possible.
Lubricating
oil cooler
Jacket water
cooler
12.02
Page 1 of 1
N
P
Scavenge
air cooler
198 98 132.5
198 38 936.5