The steam boiler operates at {TAIL ~ a pressure} above that needed for consumption in {HEAD ~ the process chamber} and uses highly purified water 
The steam boiler operates at { TAIL ~ a pressure } above that needed for consumption in { HEAD ~ the process chamber } and uses highly purified water
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH