Abstract: A complex industrial process is operated via computer control. Process control data regarding multiple process control variables is collected, along with output data regarding one or more process output properties. One or more of the process control variables is altered for a predetermined time in order to determine which of the process control variables are affecting the one or more process output properties. An effect on the one or more output properties due to the altering is determined, and, if necessary, a set point for the one or more process control variables is altered based on the effect in order to improve the process.

Abstract: A grinding shoe is designed to be a passive grinder that is advanced within the bore of a pipe being rotated in a typical pipe operation. Apparatus currently used to deliver reamer rocks on the end of a rotating lance can be modified to achieve considerable cost savings. Specifically, the apparatus utilizes a lance for advancing the shoe within the pipe without rotation. The shoe is affixed near the end of the lance in a selected attitude that determines the degree of grinding to be accomplished. A pair of shoe walls extending substantially paraxially with the rotating tube form a dual reaming head which engages the pipe interior across a cord over the bottom of the pipe.

Abstract: A grinding shoe is designed to be a passive grinder which is advanced within the bore of a pipe being rotated in a typical pipe operation. Apparatus currently used to deliver reamer rocks on the end of a rotating lance can be modified to achieve considerable cost savings. Specifically, the apparatus utilizes a lance for advancing the shoe within the pipe without rotation. The shoe is affixed near the end of the lance in a selected attitude which determines the degree of grinding to be accomplished. A pair of shoe walls extending substantially paraxially with the rotating tube form a dual reaming head which engages the pipe interior across a chord over the bottom of the pipe.