High pressure salt water system

Question 1

What pressure does the HPSWM run at?

Answer 1

7 bar

Question 2

What decks will the HPSWM run on?

Answer 2

Usually 2 deck but sometimes 5 deck on larger ships.

Question 3

How is the HPSWM powered?

Answer 3

It is supplied by electrically driven pumps.

Question 4

Describe the function of the 10% leak off valve.

Answer 4

The 10% leak off valve maintains ring main pressure at 7 bar by discarding water if pressure exceeds 7.7 bar.

Question 5

What are the uses of the HPSW system?

Answer 5

1. Firefighting - hydrants, sprays, centre feed hose reels.
2. Pre - wet
3. Fitted bilge and sullage eductors
4. Emergency cooling to prime movers.
5. Auxiliary machinery cooling water system
6. Making of fresh water
7. Flushing heads (on certain ships)

Question 6

Can salt water pumps be started locally and remotely?

Answer 6

Yes

Question 7

What are the areas that a fixed fire fighting system would be located in?

Answer 7

1. Magazines
2. Paint lockers
3. inflam store
4. funnels
5. Galley

Question 8

What kind of environment would pre-wet be used in?

Answer 8

In an NBC environment (Nuclear, biological, chemical)

Question 9

What is the purpose of pre-wet?

Answer 9

To reduce contamination of the upper decks in an NBC environment.

Question 10

State DC (damage control state) 1

Answer 10

All Salt water pumps are turned on. Ring main is isolated by shutting the state valves to minimise effects from damage.

Question 11

State DC (damage control state) 3

Answer 11

All isolating/state valves are open, one pump is supplying the whole system. Suction is taken from the sea through a strainer.