An oxidizing gas, {HEAD ~ preferably pressurized air}, is periodically fed into the exhaust line by {TAIL ~ an oxidizing gas line} for cleaning the drain line and the pressure controlling aperture therein by oxidizing the magnesium 
is periodically fed by
An oxidizing gas , { HEAD ~ preferably pressurized air } , is periodically fed into the exhaust line by { TAIL ~ an oxidizing gas line } for cleaning the drain line and the pressure controlling aperture therein by oxidizing the magnesium
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH