HPSW Flashcards

1
Q

What is the HPSW operating pressure

A

7 bar

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2
Q

What is fitted to prevent over pressurisation

A

10% leak off valve or pressure relief valve

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3
Q

State 6 uses of HPSW

A

Fire fighting
Making fresh water
Flushing heads
Pre wett
Emergency cooling to main propulsion
Auxiliary machinery cooling water system

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4
Q

Explain the flow of SW from the sea to the ring main

A

Each pump takes its suction from the sea through strainers and then gets discharged to the ring main via the riser

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5
Q

Explain the HPSW ring main

A

A ring of pipe work running around 2 deck that can be sub divided by the use of isolation valves

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6
Q

How are the pumps driven and where can they be operated from

A

Electrically driven and can be operated remotely or locally

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7
Q

Where will the HPSW sprays be located

A

Magazines
Funnels
Galley
Paint locker
Inflame stores

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8
Q

Explain the pre wett system

A

Operated in an NBC environment where to reduce nuclear biological and chemical contamination levels on the upper deck

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9
Q

Explain DC state 1

A

All the pumps are running and the dc state 1 valves are shut and the HPSWM is isolated into zones

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10
Q

Explain DC state 3

A

One pump is running but other pumps are on standby and can be started if pressure drops and all DC valves are open

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11
Q

When may more pumps be introduced

A

If the pressure drops

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