A casting furnace is fed an inert gas under pressure through a feed line with {HEAD ~ the pressure} being regulated by {TAIL ~ a melt level control device} 
A casting furnace is fed an inert gas under pressure through a feed line with { HEAD ~ the pressure } being regulated by { TAIL ~ a melt level control device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL