... heaters,etc. Several engineering contractors,including ABB Lummus Global, KBR,Linde,Stone and Webster(a Shaw Group Company),and Technip offer ... furnace is well over 150,000 mta.Pyrolysis heater radiant coil characteristics(single heater range) Number of coils 2-176Coil length ... residence time,s0.1-0.6Coil outlet pressure,KPa150-275Clen coil pressure drop,KPa10-200Ethylene capacity,mta20,000-250,000 ...