a second source of seal air provided from a tap port which is flow connected at the first stage outlet of the compressor, and wherein during compressor operation, if the receiver tank pressure is equal to or greater than the pressure at the tap port, the receiver tank will supply seal air to the seal air branch, and if {HEAD ~ the receiver tank pressure} is {TAIL ~ less then tap port pressure}, the compressed air from the tap port will supply the seal air 
is
a second source of seal air provided from a tap port which is flow connected at the first stage outlet of the compressor , and wherein during compressor operation , if the receiver tank pressure is equal to or greater than the pressure at the tap port , the receiver tank will supply seal air to the seal air branch , and if { HEAD ~ the receiver tank pressure } is { TAIL ~ less then tap port pressure } , the compressed air from the tap port will supply the seal air
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