A second source of {HEAD ~ seal air} is provided from a tap port disposed at {TAIL ~ a predetermined location} on the compressor discharge 
A second source of { HEAD ~ seal air } is provided from a tap port disposed at { TAIL ~ a predetermined location } on the compressor discharge
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH