continually lifting the drill pipe such that {HEAD ~ the drill pipe} moves independently with respect to a fixed position of the rotary control device insert until the drill pipe is separated from {TAIL ~ the rotary control device insert} 
continually lifting the drill pipe such that { HEAD ~ the drill pipe } moves independently with respect to a fixed position of the rotary control device insert until the drill pipe is separated from { TAIL ~ the rotary control device insert }
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL