In both systems, {TAIL ~ the bleed air} diverted from the combustor may be expanded in {HEAD ~ an air expander} to reduce pressure upstream of the exhaust stack or heat recovery steam generator 
In both systems , { TAIL ~ the bleed air } diverted from the combustor may be expanded in { HEAD ~ an air expander } to reduce pressure upstream of the exhaust stack or heat recovery steam generator
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH