HPSW PUMPS

Question 1

What is HPSW Operating Pressure?

Answer 1

+- 7 Bar

Question 2

What is fitted to prevent system over pressurisation?

Answer 2

10% Leak off valve.

Question 3

State 6 uses of HPSW?

Answer 3

• Fire Fighting.
• Pre Wetting.
• Fitted Bilge & Salvage Eductors.
• Emergency cooling to main propulsion Gas Turbines & Diesel Generators.
• Auxiliary Machinery cooling water system.
• Making Fresh Water.

Question 4

Explain the flow of SW from sea to ringmain.

Answer 4

Sea, Suction Pump, Strainer, Pump, Riser, Ringmain.

Question 5

Explain the HPSW Ringmain.

Answer 5

HPSW Ringmain is a complete loop/circuit of pipework, which is pressurized to 7 bar, located on 2 deck.

Question 6

Where will HPSW Sprays be located?

Answer 6

• Magazines
• Paint Lockers
• Inflam Stores
• Funnels

Question 7

Explain system configuration of DC State 1.

Answer 7

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

Question 8

Explain configuration in DC state 3?

Answer 8

All main isolating valves are open. With one pump supplying the while system. If there is a pressure drop, another pump can be started.

Question 9

When may more pumps be introduced?

Answer 9

If there is an issue that causes pressure drop in the ringmain or an increase in load. Or, during special operations, such as flying stations.