دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a ratchet device on a crane that prevents the boom of the crane from being lowered but still permits it to be raised. Also called a boom ratchet.

n: see boom dog.

n: 1. framework for supporting or containing a number of loose objects, such as pipe. See pipe rack. 2. a bar with teeth on one face for gearing with a pinion or worm gear. 3. a notched bar used as a ratchet. v: 1. to place on a rack. 2. to use as a rack.

n: refer to pipe rack

a pipe storage rack.

v: to rotate a tool in a series of short movements (like that of a ratchet wrench) to cause the tool to set. Some packers, for example, are set by ratcheting the tubing string in which the packer is made up.

n: a ratchet mechanism that is actuated by a fixed rod or chain connected to the walking beam of a pumping unit and that provides a slow rate of rotation to the rod string, distriooting the wear on both rods and tubing.