Cooling Systems

Question 1

What problems are associated if machine isn’t cooled?

Answer 1

Seizing

Wiping it bearing or in the worst case catch fire.

Question 2

What is used for the cooling systems?

Answer 2

Sea water is used to cool engine coolant (fresh water and AL39 mix) via a heat exchanger. Lubricants are cooled in the same way.

Question 3

Reasons for fresh water circulation system?

Answer 3

Machinery is susceptible to salt water corrosion.

Other equipment can be affected by salt water contamination e.g. gas turbine, fuel system and electric motors.

Question 4

What happens to machines not correctly cooled?

Answer 4

Machinery not cooled correctly is more like to cause fires, equipment failure, wiping of bearings or equipment seizing.

Question 5

What temp will white metal melt at and what’s the term associated.

Answer 5

115 degrees, if the temp is exceeded it will “wipe” the bearing.

Question 6

What loop is the two cooling systems?

Answer 6

Lubrication/AL39 systems- closed loop

Cooling circulation systems - open loop

Question 7

Main propulsion circulation system: the machinery cooled by this system includes:

Answer 7

Gas turbine cooling
Plumber block emergency cooling
Main forced lub system cooling
Controllable pitch propeller (CPP) cooling-if fitted.