hp and lp air

Question 1

what are the advantages of high pressure air (4)

Answer 1

can be easily distributed throughout ship
can be easily stored
flexability and reliability of use
low risk of fire

Question 2

what does hp air operate at (1)

Answer 2

276 bar

Question 3

what are the uses of hp air (8)

Answer 3

starting deisel engines
gas turbin starting
ship siren
breathing apparatus charging
weapon system operation
hydrolic system accumulator charging
air driven machinery operation
cross connection to low pressure air systems

Question 4

in an air compressor when do seperator bottle work at (2)

Answer 4

automatically every 30 minutes

Question 5

what do water jacket saftey valves do and what pressure do they work at(2)

Answer 5

protects salt and fresh water coolent systems
work at 3.5 bar

Question 6

what is lp air operated at (1)

Answer 6

8 bar

Question 7

what is lp air used for (4)

Answer 7

pneumatic tools
radar waveguides
emergency stern seals
pnumatic surveilance panals

Question 8

how does a hamworthy air compressor work (2)

Answer 8

uses pistons and a crank shaft connected to electric motor

Question 9

what does the relief valve opens at (5)

Answer 9

10%above stages
4.4 bar
19.25 bar
74.9 bar
303.6 bar

Question 10

how many stages are in a hamworthy compressor and what are the stage pressures (4)

Answer 10

4 stages
4 bar
17.5 bar
68bar
276 bar

Question 11

what is dieseling (1)

Answer 11

rapid increase in pressure will cause explosion of small quantity of oil/grease is present