دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a clamp placed very tightly around a drill collar that is suspended in the rotary table by drill collar slips. Should the slips fail. the clamp is too large to go through the opening in the rotary table and therefore prevents the drill collar string from falling into the hole. Also called drill collar clamp.

a clamp for flush joint pipe. Also any clamp for securing pipe above the rotary table, even when the slips are set.