The liquid oxygen stream after {TAIL ~ purification} by {HEAD ~ the guard bed} is vaporised to form a gas stream at 16 
The liquid oxygen stream after { TAIL ~ purification } by { HEAD ~ the guard bed } is vaporised to form a gas stream at 16
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH