As previously pointed out, with the spray nozzles permanently mounted at strategic points on the reactor, it is possible to reach {HEAD ~ all inner surfaces} thereof without opening {TAIL ~ the reactor} 
without opening
As previously pointed out , with the spray nozzles permanently mounted at strategic points on the reactor , it is possible to reach { HEAD ~ all inner surfaces } thereof without opening { TAIL ~ the reactor }
OTH OTH OTH 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 HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL