Service Air

Question 1

What are the service air compressor trips?

Answer 1

High Vibration
* Low Speed Pinion (1st Stage) – 1.3 mils
* High Speed Pinion (2nd & 3rd Stage) – 1.1 mils
* Bull Gear – 2.5 mils
Low Lube Oil Pressure – 10 psig
High Lube Oil Temp – 135F
High CW Outlet Temp – 120F
Auto Start Failure – 10 sec

Question 2

What are the service air isolations?

Answer 2

Low Instrument Air Header – 70#
Loss of Power or Air to Valve

Question 3

What are the Service air compressor auto starts?

Answer 3

Low Service Air Reciever Press – 92# (LAG comp in Auto)
* The respective TACS booster pump will start on a compressor start signal.

Question 4

What is the service air compressor start/run sequence?

Answer 4

1. Compressor start signal received
2. TACS Cooling water booster pump starts
3. Aux Oil Pump
4. Main Oil Pump
5. Compressor Motor Starts when pre-lube timer times out (1min)
6. Aux oil pump stops when prelube timer times out (>1min) and oil pressure is >20psig

Question 5

When does the Service Air compressor auto start?

Answer 5

• Auto Starts IF
  o Auto selectd
  o Postlube timer reset
  o Lube oil pressure <20psig
  o Associated Compressor has a start signal
• When tagging the AOP, remember to close the air valve first prior to tagging the breaker open to prevent inadvertent start of the pump.

Question 6

When does the service air main oil pump auto start?

Answer 6

• Auto Start if:
  o Postlube timer reset
  o Lube oil pressure >20psig
  o Associated Compressor has a start signal.
• If the compressor is in manual, the MOP will start when > 20 psig of lube oil pressure is sensed.