This section is available on request - MAN Diesel & Turbo
This section is available on request - MAN Diesel & Turbo
This section is available on request - MAN Diesel & Turbo
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<strong>MAN</strong> B&W 11.02<br />
Central Cooling Water System<br />
The central cooling water system <str<strong>on</strong>g>is</str<strong>on</strong>g> character<str<strong>on</strong>g>is</str<strong>on</strong>g>ed<br />
by having <strong>on</strong>ly <strong>on</strong>e heat exchanger cooled by<br />
seawater, and by the other coolers, including the<br />
jacket water cooler, being cooled by central cooling<br />
water.<br />
In order to prevent too high a scavenge air temperature,<br />
the cooling water design temperature<br />
in the central cooling water system <str<strong>on</strong>g>is</str<strong>on</strong>g> normally 36<br />
°C, corresp<strong>on</strong>ding to a maximum seawater temperature<br />
of 32 °C.<br />
Our recommendati<strong>on</strong> of keeping the cooling water<br />
inlet temperature to the main engine scavenge<br />
Regarding the lubricating oil coolers,<br />
th<str<strong>on</strong>g>is</str<strong>on</strong>g> valve should be adjusted so that<br />
the inlet temperature of the cooling<br />
water <str<strong>on</strong>g>is</str<strong>on</strong>g> not below 10 °C<br />
Air pockets, if any, in the pipe line<br />
between the pumps, must be vented<br />
to the expansi<strong>on</strong> tank<br />
Jacket cooling water<br />
Sea water<br />
Fuel oil<br />
Seawater<br />
outlet<br />
Seawater<br />
pumps<br />
Seawater<br />
inlet<br />
Fig. 11.02.01: Central cooling water system<br />
TI<br />
PI TI PI TI<br />
Seawater<br />
inlet<br />
The letters refer to l<str<strong>on</strong>g>is</str<strong>on</strong>g>t of ‘Counterflanges’, Fig. 5.10.01<br />
The item No. refer to ‘Guidance values automati<strong>on</strong>’<br />
TI<br />
Central<br />
cooler<br />
PT 8421 AL<br />
PI<br />
TI 8431<br />
Central cooling<br />
water pumps<br />
Page 1 of 1<br />
air cooler as low as possible also applies to the<br />
central cooling system. <str<strong>on</strong>g>Th<str<strong>on</strong>g>is</str<strong>on</strong>g></str<strong>on</strong>g> means that the temperature<br />
c<strong>on</strong>trol valve in the central cooling water<br />
circuit <str<strong>on</strong>g>is</str<strong>on</strong>g> to be set to minimum 10 °C, whereby the<br />
temperature follows the outboard seawater temperature<br />
when central cooling water temperature<br />
exceeds 10 °C.<br />
For external pipe c<strong>on</strong>necti<strong>on</strong>s, we prescribe the<br />
following maximum water velocities:<br />
Jacket water ................................................ 3.0 m/s<br />
Central cooling water .................................. 3.0 m/s<br />
Seawater ..................................................... 3.0 m/s<br />
Expansi<strong>on</strong> tank<br />
central cooling water<br />
TE 8431 I AL<br />
178 52 77�1.1<br />
<strong>MAN</strong> B&W MC/MC�C, ME/ME�C/ME�GI/ME-B engines 198 40 57�9.5<br />
<strong>MAN</strong> <strong>Diesel</strong><br />
TI<br />
TI<br />
TI<br />
These valves to be provided<br />
with graduated scale<br />
Lubricating<br />
oil cooler<br />
Jacket water<br />
cooler<br />
N<br />
P<br />
AS<br />
Main<br />
engine<br />
Cooling water<br />
drain air cooler
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