Module 7 Flashcards
How are High pressure salt water pumps driven
Electrically
How do you stop over pressurisation
Pressure relief valve
10% leak off
Where would fixed sprayes be used in areas of high risk
Magazines
Paint lockers
Inflame stores
Funnel
HPSW System uses
Firefighting Pre wetting system Fitting bigle and salvage eductors Emergency cooling to main propulsion gas turbines/ diesel generators Auxiliary machinery cooling water system Flushing heads
Where are ringmans fitted
With the isolation valves
How can the construction of a ringman be described
A ring of pipework running around 2 deck that can be sub-devided by the use of isolation valves
What is pre wetting used for
Used in a nuclear biological and chemical environment to reduce contamination levels
What are the damage control states
DC state 1
DC state 3
Whats DC state 1
Valves are shut
All pumpe are running
Used is under threat or attack
DC state 3
All valves are open and only one pump is supplying the whole system
Normal everyday use
Whats the purpose of the crosscontection valves
If one strainer us blocked
What temp does white metal melt at
115 degrees C
Reasons for fresh water circulation system
Machinary is susceptible to salt water
Other equipment can be affected by salt water contamination
What happens is machinary is jot cooled correctly
More likely to cause fires, equipment failure, bearings wipe or equipment sizing
Main propulstion of cooling system
Lube oil hest exchange
Gas turbine head exchanger
CPP unitl heat exchanger
Plumber block heat exchanger
Is lubrication/ AI39 system an ooen or closed loop system
Closed loop
