Cooling Systems

Question 1

State machinery being cooled by main propulsion cooling system?

Answer 1

Gas Turbine Cooling.
Plummer block emergency cooling.
Main forced lub system cooling.
Controllable pitch propeller if fitted.

Question 2

State Machineray being cooled by the Auxiliary cooling system?

Answer 2

Diesel Generators.
Air conditioning plants.

Question 3

When would a cross connection between PORT and STBD be used?

Answer 3

If there is a drop in pressure of the cooling system and there is a need for emergency cooling of diesel generators. Or, in special operations, ie, flying.

Question 4

What temp do white, metal bearing melt at?

Answer 4

115°C

Question 5

What might happen to machinery not cooled correctly?

Answer 5

May seize, melt or create fire.

Question 6

Why is FW used in cooling system?

Answer 6

Certain machinery may be vulnerable to rust.

Certain machinery may be vulnerable to salt water contamination.

Question 7

Definitions of FW & SW?

Answer 7

FW:
Less than 0.5% salt.

SW:
More than 3% Salt.

Question 8

When would FW be cross connected to SW?

Answer 8

During maintenance. Allows for pump to draw on opposite side of Ringmain, to carry out maintenance on pump strainer.

Question 9

Whose permission would be needed for Cross Connection?

Answer 9

MEO.