The present invention relates to a process using {HEAD ~ improved reactor tubes} for use as a heat absorbing surface in any fired heater or {TAIL ~ furnace} 
The present invention relates to a process using { HEAD ~ improved reactor tubes } for use as a heat absorbing surface in any fired heater or { TAIL ~ furnace }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL