Theory 3(HP+LP air)(RN)

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  • Created by: Moles12!
  • Created on: 25-05-21 07:40
State 4 advantages of HP air
Can be easily distributed through the ship
Air can easily be stored
Flexibility and reliability of use
Low risk of fire
1 of 16
What is the operating pressure of the HP air system ?
276 Bar
2 of 16
What does IMS and OMS stand for ?
IMS-Inside Machinery Space
OMS-Outside Machinery Space
3 of 16
State 8 uses for HP air
Start gas turbines
Start diesel engines
Ships siren
Breathing apparatus charging
Weapon system operation
Hydraulic accumulator charging
Air driven machinery operation
Cross connection to LP air system
4 of 16
Briefly describe the hamworthy compressor
Its a HP air compressor with two crank,single acting watercooled, reciprocating machine, driven by an induction motor.
5 of 16
Describe the ring main
The ring main is a continuous loop of piping to which air is supplied, by the compressor.
6 of 16
What does MMS and OMS stand for with reference to the ring main ?
MMS-Main Machinery Space(Ring main)
OMS-Outside Machinery Space(ring main)
7 of 16
Where does the compressor draw its air from ?
The compressor takes its draw from an air treatment plant.
8 of 16
How long is the interval for emptying the intercooler ?
The intercooler removes excess oil and water, which is then drained every 30 minutes.
9 of 16
What pressure is a water jacket set to ?
3.5 Bar
10 of 16
What pressures do each of the 4 stages produce in a HP compressor ?
Stage 1 - 4Bar
Stage 2 - 17.5Bar
Stage 3 - 68Bar
Stage 4 - 276Bar
11 of 16
Name the 2 alarms and warnings.
High water temperature
Low oil pressure
12 of 16
Name the two electrical safety features and when they trip.
And state what mechanical trips are in place
High water temperature switch 54C
Low lub oil pressure switch >0.69 bar
Pressure relief valves
13 of 16
What is the operating pressure of LP air system ?
8 Bar
14 of 16
State 4 services fed by LP air.
Pneumatic tools
Radar waveguide
Emergency stern seal
Pneumatic surveillance panels
15 of 16
What PPE should be used when working on Air systems ?
Ear defenders
Eye protection
16 of 16

Other cards in this set

Card 2

Front

What is the operating pressure of the HP air system ?

Back

276 Bar

Card 3

Front

What does IMS and OMS stand for ?

Back

Preview of the front of card 3

Card 4

Front

State 8 uses for HP air

Back

Preview of the front of card 4

Card 5

Front

Briefly describe the hamworthy compressor

Back

Preview of the front of card 5
View more cards

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