Fresh water cooling systems return.
The cylinder jacket cooling water after leaving the engine passes to a sea water circulated cooler and then in to the jacket water circulating pumps. It is then pumped around the cylinder jackets, cylinder heads and turbo blowers.
A header tank allows for expansion and water make-up in the system. Vents are led from the engine to the header tank for the release of air from the cooling water. A heater in the circuit facilitates the warming of the engine prior to starting by circulating hot water.
The mixing tank is used to collect recirculated oil and also acts as a buffer or reserve tank as it will supply fuel when the daily service tank is empty.