Oral Air Compressor questions

Question 1

Identify the safety features from an air compressor to the air receiver.

Answer 1

1. Pressure relief valve
2. Non return valve
3. Drain
4. Pressure and temperature safety switch
5. Curcuit breakers, thermal overload,(electric motor)
6. Bursting disk, (water cooled system)

Question 2

What is the cause of an airline explosion?

Answer 2

1. Static from fast flowing air
2. Combustion gas bypass back into the air system
3. Poor maintenance
4. System not draining correctly
5. Compressor oil bypassing rings

Question 3

The compressor suction filter is dirty and the compressor discharge temperature increases. What protection device(s) are fitted to stop an airline explosion?

Answer 3

(Examiner was looking for the high discharge temperature cut out.)

Question 4

Identify the safety features from an air compressor to the air receiver and up to the air start valve on the engine.

Answer 4

1. Electrical breakers and overloads
2. Bursting disk (compressor)
3. Relief valves
4. Drains
5. Temperature and pressure switches
6. Non return valve
7. Flame arrester
8. Bursting disk (air start line)
9. Temperature gauge (start air line)

Question 5

How could an air line explosion occur after the compressor?

Answer 5

1. Poor maintenance practices
2. Oil in the system
3. Drains not working
4. Safety cut out not working

Question 6

Why would it be bad if this explosion reached the air receiver?

Answer 6

1. Catastrophic rupture
2. Large explosion due to oil and oxygen
3. Large amount of damage

Question 7

What are the dangers of having oil/water in compressed air pipework?

Answer 7

a

Question 8

How often are the air receivers (pressure vessels) surveyed/inspected?

Answer 8

(Candidate said “as per Class requirements, which is yearly”.)

Question 9

Describe a starting air system and its components.

Answer 9

1. Compressor
2. Reciver
3. Valves and pipe work
4. Safety valves and switches
5. Start air distributor
6. Start air valve
7. Manifold