HPSWM

Question 1

What are the HPSW system used for

Answer 1

Firefighting hydrants/sprays/centre feed hose reel.
Pre-wetting system.
Fitted bilge and salvage eductors.
Emergency cooling to main propulsion gas turbines/ Diesel generators.
Auxiliary machinery cooling water system.
Making of fresh water.
Flushing heads.

Question 2

Salt water ringmain

Answer 2

The salt water is supplied to the services that require it from a ring main running around 2 deck. It’s a ring of pipe work, running around 2 deck that can be sub- divided by the use of isolation valves.

Question 3

Salt water pumps

Answer 3

Electrically driven pump which are located low down.

Question 4

What is a riser?

Answer 4

Vertical pipe that rises salt water from machinery space level up to 2/5 deck

Question 5

What does a pump leak-off valve?

Answer 5

Each pump has its own 10% leak off valve to prevent over pressurisation. 10% above normal pressure of 7 bar.

Question 6

Salt water pumps

Answer 6

Salt water flows from the sea to the strainer to the pump, the pump will then send it to a riser that sends it up to the ring main.

Question 7

Saltwater flows

Answer 7

From the sea to the strainer to the pump, will then send it to a raiser that sends it up to the ring main.

Question 8

What is a spray

Answer 8

Fixed firefighting pieces of equipment are supplied by HPSWM.

Question 9

What is Pre-wet

Answer 9

In a NBC environment to reduce nuclear, biological and chemical contamination on the upper deck to remove and break down anything from the follow that may remain in the deck.

Question 10

HPSWM

Answer 10

The high pressure salt water main allows you to attach fire hydrants and fight fires or use the hose.

Question 11

DAMAGE CONTROL STATES

Answer 11

There’s a DC STATE 1 & 3

Question 12

Dc state 1

Answer 12

Individual HPSW pumps supply their own section of the ringmain. The ringmain is isolated by shutting the state valves to minimise effects from damage.

Question 13

Dc state 3

Answer 13

All main isolating/state valves open, with one pump supplying the whole system. Should system pressure drop a second pump can be started.

Question 14

Who needs to sign off on the propulsion circulation system

Answer 14

MEO

Question 15

Machinery supplied by the main propulsion cooling system:

Answer 15

Lub oil heat exchanger.
Gas turbine heat exchanger.
CPP init heat exchanger.
Plummer block heat exchanger.

Question 16

Machinery supplied by the AUX circulation system

Answer 16

Air conditioning plant.

Diesel plant/generators.

Question 17

When can the fresh water and salt water circulation system be cross connected?

Answer 17

In an emergency. (Fresh water pump failure, but only with MEO permission.)