Man B&W S50MC-C8-TII User Manual

MAN B&W 11.02
Page 1 of 1
MAN Diesel
MAN B&W MC/MCC, ME/MEC/MEGI/ME-B engines 198 40 579.5
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 10 °C, whereby the
temperature follows the outboard seawater tem-
perature when central cooling water temperature
exceeds 10 °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 771.1
TI
TI TI
TI
TI
TI
PI PI
PI
TI
Seawater
outlet
Central
cooler
Seawater
pumps
Central cooling
water pumps
Expansion tank
central cooling water
These valves to be provided
with graduated scale
Lubricating
oil cooler
Jacket water
cooler
N
P
AS
Main
engine
Cooling water
drain air cooler
Regarding the lubricating oil coolers,
this valve should be adjusted so that
the inlet temperature of the cooling
water is not below 10 °C
Air pockets, if any, in the pipe line
between the pumps, must be vented
to the expansion tank
Seawater
inlet
Seawater
inlet
Jacket cooling water
Sea water
Fuel oil
The letters refer to list of ‘Counterflanges’, Fig. 5.10.01
PT 8421 AL
TE 8431 I AL
TI 8431
The item No. refer to ‘Guidance values automation’

Man B&W S50MC-C8-TII Specifications

General

Brand	Man
Model	B&W S50MC-C8-TII
Category	Engine
Language	English