... :25Cr35Ni+MA 3.ISO9001:2008 Ethylene Plant Steam Cracker Coil Systems1.Standard:ASME,ANSI,ASTM,DIN,GB2 ... is heated and cracked in the presence of steam by tubular furnace,outlet temperature 815-870°C ... well over 150,000 mta.Pyrolysis heater radiant coil characteristics(single heater range)Number of coils ... .1-0.6Coil outlet pressure,KPa150-275Clen coil pressure drop,KPa10-200Ethylene capacity,mta20,000- ...