... ,ANSI,ASTM,DIN,GB 2.Material:25Cr35Ni+MA 3.ISO9001:2008 Heater Radiant Coil1.Standard:ASME,ANSI,ASTM,DIN,GB2. ... share a common stack, and the height of the heater may vary from 30 to 50m.Before the 1960s, ... is well over 150,000 mta.Pyrolysis heater radiant coil characteristics(single heater range)Number of coils 2-176Coil length, ... drop,KPa10-200Ethylene capacity,mta20,000-250,000 Heater Radiant Coil