Tool Joint to Drill Pipe Alignment has always been an important factor to drill pipe users. Poor angular alignment causes rapid eccentric wear of the tool joint outside diameter and increases the stress at the upset to pipe body transition
The TJAG measures the tool joint to drill pipe alignment. Utilizing a rigid parallelogram, with ball bearing pivots at each corner, and a dial indicator between the horizontal arms, to measure the parallel movement between the tool joint outside diameter and the pipe body outside diameter. Defining the parallel misalignment with a direct reading in inches.
