Marine Installation Manual
2021-08
4-10
4 Ancillary Systems
4.2 Cooling water system
X72DF
Figure 4
-
6 HT cooling water circuit
High-temperature circuit components
HT cooling water pump
SM-0321
Main
Engine
3
9
2
1
6
6
8
7
10
4
5
1 HT Pumps
2 Pre-heater pump (optional)
3 Pre-heater for ME
4 HT Cooler (HTC)
5 Automatic temp. control valve
6 Throttling disc
7 Freshwater generator
8 HT Circuit buffer unit
9 Buffer unit supply pump
10 CW feed & drain tank
Pump type
Centrifugal, preferably with a steep head curve
a)
a) As a guide, the minimum advisable curve steepness can be defined as follows:
For a pressure increase from 100 to 107%, the pump capacity should not decrease by more than
10%.
Pump capacity
According to
: The flow capacity is to be within a tolerance
of -10 to +20% of the GTD value
Delivery head
b)
b) The pump delivery head (
p
p
) will be:
[bar]
where:
p
ei
= pressure at engine inlet [bar]
p
st
= static pressure* at pump inlet [bar]
Δ
p
= pressure losses over piping between pump outlet and engine inlet [bar]
h
= height difference between pump outlet and engine inlet [m]
*
If an expansion tank is used, p
st
equals the static pressure head from the change in height between
expansion tank and pump inlet.
If a buffer unit is used, p
st
equals the buffer unit pressure plus the pressure head from the change
in height between buffer unit and pump inlet.
The pressure (
p
ei
) at engine inlet must be 3.0-5.0bar(g).
To be determined according to the total pressure losses (resist
-
ance) of the actual piping installation arrangement
Working temperature
95 °C
10.2
p
ei
st
h
p
p
p
p
=
-
+ D +
