... Ethylene Plant.Commercial furnacesThermal cracking of hygrocarbons is accomplished in tubular reactors commonly known as cracking furnaces,crackers,cracking heaters, ... share a common stack, and the height of the heater may vary from 30 to 50m.Before the 1960s,cracking ... furnace is well over 150,000 mta.Pyrolysis heater radiant coil characteristics(single heater range)Number of coils 2-176Coil length, ...