Fig 9-12
Example of air venting device (3V76C4757)
9.3.9
Expansion tank (4T05)
The expansion tank compensates for thermal expansion of the coolant, serves for venting of
the circuits and provides a sufficient static pressure for the circulating pumps.
Design data:
70 - 150 kPa (0.7...1.5 bar)
Pressure from the expansion tank at pump inlet
min. 10% of the total system volume
Volume
NOTE
The maximum pressure at the engine must not be exceeded in case an electrically
driven pump is installed significantly higher than the engine.
Concerning the water volume in the engine, see chapter Technical data.
The expansion tank should be equipped with an inspection hatch, a level gauge, a low level
alarm and necessary means for dosing of cooling water additives.
The vent pipes should enter the tank below the water level. The vent pipes must be drawn
separately to the tank (see air venting) and the pipes should be provided with labels at the
expansion tank.
The balance pipe down from the expansion tank must be dimensioned for a flow velocity not
exceeding 1.0...1.5 m/s in order to ensure the required pressure at the pump inlet with engines
running. The flow through the pipe depends on the number of vent pipes to the tank and the
size of the orifices in the vent pipes. The table below can be used for guidance.
9-16
Wärtsilä 46F Product Guide - a19 - 1 December 2017
Wärtsilä 46F Product Guide
9. Cooling Water System
Содержание 12V46F
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