HPSW Flashcards
What is the HPSW operating pressure
7 bar
What is fitted to prevent over pressurisation
10% leak off valve or pressure relief valve
State 6 uses of HPSW
Fire fighting
Making fresh water
Flushing heads
Pre wett
Emergency cooling to main propulsion
Auxiliary machinery cooling water system
Explain the flow of SW from the sea to the ring main
Each pump takes its suction from the sea through strainers and then gets discharged to the ring main via the riser
Explain the HPSW ring main
A ring of pipe work running around 2 deck that can be sub divided by the use of isolation valves
How are the pumps driven and where can they be operated from
Electrically driven and can be operated remotely or locally
Where will the HPSW sprays be located
Magazines
Funnels
Galley
Paint locker
Inflame stores
Explain the pre wett system
Operated in an NBC environment where to reduce nuclear biological and chemical contamination levels on the upper deck
Explain DC state 1
All the pumps are running and the dc state 1 valves are shut and the HPSWM is isolated into zones
Explain DC state 3
One pump is running but other pumps are on standby and can be started if pressure drops and all DC valves are open
When may more pumps be introduced
If the pressure drops