HPSW

Question 1

HPSW operating pressure

Answer 1

7bar - 100/120psi

Question 2

What prevents overpressurisation

Answer 2

10% leak off, pressure relief valves

Question 3

Six uses of HPSW

Answer 3

Firefighting
Pre wet
Fitted bilge and salvage eductors
Emergency cooling
Auxillary cooling
Making fresh water
Flushing heads

Question 4

Explain flow of SW from sea to ringmain

Answer 4

Pumps take suction from sea through strainers to discharge through the ringmain via riser

Question 5

Explain the ringmain

Answer 5

Ring of pipework running around 2 deck that is sub divided by isolating valve

Question 6

How are the HPSW pumps driven

Answer 6

Electrically driven

Question 7

Where can HPSW pumps operated from

Answer 7

Local, and Remote

Question 8

Where will HPSW sprays be located

Answer 8

Upper decks

Question 9

Explain Pre Wet systems

Answer 9

Washes contaminants off upper decks which may contain nucleur, biological, or chemical contaminants

Question 10

DC State 1

Answer 10

Used when expecting damage
All pumps
Divided into zones
All valves shut

Question 11

DC State 3

Answer 11

Used during normal operations
1 pump running
Others on standby
All valves open

Question 12

When can more pumps be introduced

Answer 12

In an emergency, when there is a possibility of a pump no longer working or sustaining damage