The process pressure was also varied between a pressure of {HEAD ~ 750 psi} at {TAIL ~ the lower packing temperature} to a pressure of 450 psi at the upper packing temperature of 450° F.  
The process pressure was also varied between a pressure of { HEAD ~ 750 psi } at { TAIL ~ the lower packing temperature } to a pressure of 450 psi at the upper packing temperature of 450 ° F.
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH