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