HP and LP Air

Question 1

Why is HP air used onboard? (4)

Answer 1

Easily Distributed

Easily Stored

Flexible and Reliable

Less chance of catching fire

Question 2

Where is HP AND LP used onboard

Answer 2

Inside machinery space

Outsidr machinery space

Question 3

Six services HP air uses

Answer 3

Diesel Starting

Gas Turbine Starting

Weapons System operations

Hydraulic Accumulator charging

Ship Siren Operation

Breathing Apparatus charging

Question 4

HP operating pressure

Answer 4

276bar

Question 5

When do relief valves operate

Answer 5

When system is overpressurised, to prevent damage to the system

Question 6

4 stages of hpac

Answer 6

4 bar
17.5bar
68bar
276bar

Question 7

What do drains in HPAC do

Answer 7

Blow accumulated oil and moisture to bilge from low point on separator bottles

Question 8

What does the separator in hpac do?

Answer 8

Causes moisture droplets carried in suspension

Question 9

How often do drains and separators operate?

Answer 9

Every 30 mins

Question 10

Water jacjet safety valve pressure

Answer 10

3.5bar

Question 11

Lp air operating pressure

Answer 11

8bar

Question 12

What does water jacket safety valves protect

Question 13

Four services that use LP air

Answer 13

Pneumatic tools

Radio Waveguides

Emergency Stern Seal

Pneumatic survalillence panels

Question 14

PPE of charging bottles

Answer 14

Goggles, ear defenders