Xi’an Chancemate Petroleum Mechanical Co.,Ltd

The mechanical external cutter are automatic spring-fed cutters that provide fast, efficient, external cutting and recovery of long sections of tubing, drill pipe or casing. The spring-fed feature prevents excessive strain from being applied from the rig floor, which could cause the knives to burn or break before the cut is made.

The Body of the mechanical external cutter is designed so that when an upward strain is taken on the cutting string (and the Spring Dog Assembly has engaged a tool joint or collar), the downward travel of the Spring Dog Assembly and the Thrust Washer is limited to compressing the Main Spring and to shearing the Feed Ring Shear Pin. Thereafter the Knives are fed for the cutting operation only by the Main Spring. A Thrust Bearing Assembly assures smooth, low-friction rotation of the cutter.

The Spring Dog is designed to catch under the coupling to actuate the cutter and retain the cut-off section of the pipe. It is effective for use with couplings, collars or squared shoulder tool joints. It is standard and will be furnished unless an alternate optional catcher assembly is specified.

The optional Ratchet Pawl Assembly is used if the pipe being cut has external upset integral tool joints. This assembly may also be used with couplings.

The optional Slip Assembly is used if the pipe to be cut has external flush tool joints. The Slips will grip the pipe at any point in its length to actuate the cutter and retain the cut-off section of pipe.

the mechanical external cutter are available to cut all popular sizes of drill pipe and tubing. Special sizes will be furnished on special order.