Marine Installation Manual
2021-08
4-8
4 Ancillary Systems
4.2 Cooling water system
X72DF
Low-temperature circuit components
Seawater
circulating pump
The seawater circulating pump delivers seawater from the high and low sea
chests to the central seawater cooler.
Seawater strainer
Simplex or duplex strainers to be fitted at each sea chest and arranged to enable
manual cleaning without interrupting the flow. The strainer mesh size (max.
6mm) must prevent the passage of large particles and debris that could damage
the pumps and impair the heat transfer across the coolers.
Central seawater cooler
Pump type
Centrifugal
Capacity
: The seawater flow capacity covers the
need of the engine only and is to be within a tolerance of
0 to +10% of the GTD value
Delivery pressure
Determined by system layout
Working temperature
According to ship specification
Cooler type
Plate or tubular
Cooling medium
Seawater
Cooled medium
Freshwater
Design criterion
Keeping max. 36°C LT while seawater temp. is 32°C
Margin for fouling
10-15% to be added
Heat dissipation
Refer to
Freshwater flow
Seawater flow
Temperatures
