... in tubular reactors commonly known as cracking furnaces,crackers,cracking heaters,etc. Several engineering contractors,including ABB Lummus Global, KBR ... furnace is well over 150,000 mta.Pyrolysis heater radiant coil characteristics(single heater range) Number of coils 2-176Coil ... time,s0.1-0.6Coil outlet pressure,KPa150-275Clen coil pressure drop,KPa10-200Ethylene capacity,mta20,000-250,000 ...