IA: Instrument Air Flashcards
Is the IA System safety related?
No
What is the power supply to the IA Compressors?
NG
PVNGS has ___ compressors that can provide _____% capacity each.
3
100%
What is the IA pressure requirement to operate components?
80 psig
What is the backup supply to IA? When does it open?
N2
85 psig
How many air compressors are normally running?
1
What cools the IA Compressors normally?
TC
What cools the IA Compressors during an outage?
DS
What will isolate IA to containment?
CSAS
If IAA-UV-2 closed automatically, can it be overridden?
Yes
What position does IAA-UV-2 fail?
Closed on a loss of power (PKA)
IA Receivers are sized to provide _____ seconds of storage.
30 seconds
How often does the IA Master Controller cycle IA Compressors?
Once a week
What is the normal IA band?
109 psig - 119 psig
At _____ psig the delay timer is used to determine if additional IA Compressors need to be loaded.
109 psig
At _____ psig the delay timer is used to determine if additional IA Compressors need to be unloaded.
119 psig
At _____ psig all IA Compressors are unloaded.
124 psig
When the IA Master Controller starts a compressor, it runs unloaded for _____ seconds.
20 seconds
When the IA Master Controller stops a compressor, it runs unloaded for _____ seconds and then ______.
15 seconds
stops
What sequence do the IA compressors default to if the Master Controller fails?
A-B-C
What happens if you press the Emergency Stop button on an IA Compressor?
It will immediately stop without unloading
The IA Compressor discharges high pressure and temperature oil-air mixture to the ____________.
Separator
What provides the motive force for oil to circulate through an IA Compressor?
Pressure in the Separator Tank
What is the temperature rise from inlet to outlet on an IA Compressor?
+ 95F
Normal loaded amps for and IA Compressor is _______A. Normal unloaded amps is _________A.
150 A loaded
90 A unloaded
Where is all the IA stuff in the Control Room?
B07
When does the Low Pressure alarm come in for IA in the Control Room?
95 psig
At what pressures does the N2 backup to IA isolation, PV-52, open and close?
Opens at < 85 psig
Closes at 105 psig
How many air dryers are normally in service in the IA system?
1
When will operation of a CR hand switch stop a running IA Compressor?
Always
At what pressure is Service Air maintained?
115 psig - 125 psig
If the Service Air Compressor runs unloaded for _____ minutes then the drive motor trips.
30 minutes
What comes on first: Standby IA Compressors or the IA low pressure alarm?
Standby Compressors then low pressure alarm
