In his younger, more daring days, when he would routinely slip his head into the animal's mouth, his face was nearly crushed on two occasions by " 100 pounds of closing pressure per square inch, " he said.
12.
Drill pipe including the larger-diameter tool joints ( threaded connectors ) can be " stripped " ( i . e ., moved vertically while pressure is contained below ) through an annular preventer by careful control of the hydraulic closing pressure.
13.
This higher pressure is developed by the relative speeds in feet per second ( not RPM or journal size directly ) of the crankshaft journal itself against the bearing, the bearing width ( to the closest pressure leak ), oil viscosity, and temperature, balanced against the bearing clearance ( the leakage rate ).
