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