The square, hexagonal or other shaped steel pipe connecting the swivel to the drillpipe. The kelly moves through the kelly bushings, rotary table and rotates the drillstring.
Source: API RP 54
The square, hexagonal or other shaped steel pipe connecting the swivel to the drillpipe. The kelly moves through the kelly bushings, rotary table and rotates the drillstring.
Source: API RP 54