WÄRTSILÄ WARTSILA32, Product Manual, Page: 134 / 254

The fresh water cooling system is divided into a high temperature (HT) and a low temperature
(LT) circuit. The HT water circulates through cylinder jackets, cylinder heads and the 1st stage
of the charge air cooler, while the LT water circulates through the 2nd stage of the charge air
cooler and through the lubricating oil cooler.
A two-stage charge air cooler enables more efficient heat recovery and heating of cold
combustion air.
The LT water circulates through the charge air cooler and the lubricating oil cooler, which is
built on the engine.
Temperature control valves regulate the temperature of the water out from the engine, by
circulating some water back to the cooling water pump inlet. The HT temperature control valve
is always mounted on the engine, while the LT temperature control valve can be either on the
engine or separate. In installations where the engines operate on MDF only it is possible to
install the LT temperature control valve in the external system and thus control the LT water
temperature before the engine.
9.2.1 Engine driven circulating pumps
The LT and HT cooling water pumps are engine driven. The engine driven pumps are located
at the free end of the engine.
Pump curves for engine driven pumps are shown in the diagrams. The nominal pressure and
capacity can be found in the chapter Technical data.
Fig 9-3 Pump curves for engine driven HT- and LT- water pumps (4V19L0240C,
DAAF022986A, DAAF022987A, DAAF022998A, DAAF022999A)
9-4 Wärtsilä 32 Product Guide - a21 - 7 September 2016
Wärtsilä 32 Product Guide 9. Cooling Water System