دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a feature on four-pin kelly bushings installed on floating offshore rigs (which employ a conventional rotary table assembly) that secures the kelly bushings pins to the master bushings corresponding drive holes so that the kelly bushing will not separate from (lift off of) the master bushing as the rig heaves up and down with wind and wave motion. See kelly bushing, master bushing.

n: see kelly bushing lock assembly.