MAN B&W 11.02
Page of
MAN Diesel
MAN B&W MC/MCC, ME/ME-B/MEC/MEGI engines 198 40 579.4
Central Cooling Water System
Fig. 11.02.01: Central cooling water system
The central cooling water system is characterised
by having only one heat exchanger cooled by
seawater, and by the other coolers, including the
jacket water cooler, being cooled by central cool-
ing water.
In order to prevent too high a scavenge air tem-
perature, the cooling water design temperature
in the central cooling water system is normally 36
°C, corresponding to a maximum seawater tem-
perature of 32 °C.
Our recommendation of keeping the cooling water
inlet temperature to the main engine scavenge
air cooler as low as possible also applies to the
central cooling system. This means that the tem-
perature control valve in the central cooling water
circuit is to be set to minimum 0 °C, whereby the
temperature follows the outboard seawater tem-
perature when central cooling water temperature
exceeds 0 °C.
For external pipe connections, we prescribe the
following maximum water velocities:
Jacket water ................................................ 3.0 m/s
Central cooling water .................................. 3.0 m/s
Seawater ..................................................... 3.0 m/s
178 52 771.1
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