Marine Installation Manual
2021-08
4-16
4 Ancillary Systems
4.2 Cooling water system
X72DF
4.2.6
General recommendations for the cooling water system design
•
The number of valves in the system must be kept to a minimum to reduce
the risk of incorrect setting.
•
Valves are to be locked in the set position and labelled to eliminate incorrect
handling.
•
After the system commissioning is completed, it is prohibited to manually
interfere with the cooling water flow in different branches of the ME
cooling water system by adjusting the valves or the orifice.
•
Under normal operation of the cylinder cooling water system, the pump de
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livery head and the total flow rate are to remain constant, even when the
freshwater generator is started up or shut down.
•
The cylinder cooling water system is to be totally separated from steam sys
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tems. Under no circumstances must there be any possibility of steam en
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tering the cylinder cooling water system, e.g. via a freshwater generator.
•
The installation of equipment affecting the controlled temperature of cyl
-
inder cooling water (CCW) is to be examined carefully before being added.
Uncontrolled increases or decreases in CCW temperature may lead to
thermal shock of engine components and scuffing of pistons. Thermal
shock is to be avoided, and the temperature gradient of the cooling water
when starting and shutting down additional equipment is not to exceed two
degrees per minute (2 °C/min) at engine inlet.
•
The design pressure and temperature of all the component parts such as
pipes, valves, expansion tank, fittings, etc. are to meet the requirements of
the classification society.
