... straight coils,short residence time about 0.1s nd low working pressure.Special construction furnace guarantee high outlet of olefinc hydrocarbons ... 150,000 mta.Pyrolysis heater radiant coil characteristics(single heater range) Number of coils 2-176Coil length,m9-80Inside coil ... 120Bulk residence time,s0.1-0.6Coil outlet pressure,KPa150-275Clen coil pressure drop,KPa10-200Ethylene capacity,mta20,000-250, ...