Abstract: A hydrostatic pipe tester is especially designed for testing pipe at high pressures safely. Threaded tension rods are supported on both sides of the pipe under test such that their axes are coplaner with the pipe under test, and coupling assemblies couple the pipe under test to the threaded tension rods within the plane. A novel bleeding assembly and a novel check valve is also disclosed.

Abstract: In accordance with an illustrative embodiment of the present invention, a pipe alignment tool includes upper and lower, vertically aligned clamp assemblies that can be opened and closed in order to encircle and grasp adjacent threaded end sections of well pipe to bring them into precise vertical alignment. The upper clamp assembly can be lowered toward the lower clamp assembly while the upper pipe section is rotated in order to at least partially make up the threaded connection.

Abstract: In accordance with an illustrative embodiment of the present invention, a pipe alignment tool comprises upper and lower pipe clamp assemblies connected together in axial alignment by hydraulic cylinders that are selectively operable to adjust the vertical separation of said clamp assemblies, a first set of slips on said upper clamp assembly for gripping and supporting an upper pipe joint, a second set of slips on said lower clamp assembly for gripping a pipe joint extending into the wall, and inclined surfaces on said slips and said clamp assemblies for tightening the engagement of said slips with the pipe joint that they engage in response to downwardly directed force.

Abstract: A powered pipe thread cleaner for oil pipe and oil casings has a housing which defines a sump for collecting dirty solvent during the thread cleaning process. The thread cleaner is of the driven brush type and employs specially configured brushes and brush support structures for minimal interference where the flow of dirty fluid within the housing during cleaning. The thread cleaner is designed for operator comfort and ease of operation.

Abstract: A mobile pipe straightening machine is of relatively light-weight construction for increased transportability and finds particular application for straightening drill pipe in the field. For minimizing the overall weight of the machine, a bed frame is provided in an elongate, trough-shaped, construction having first and second upstanding sides and a bottom member to define a bed space. At least one drive roll is swivelly supported within the bed space, and first and second idler rolls are movably coupled to the bed frame in spaced relationship with the one drive roll. Each idler roll is supported within a housing which in turn is supported within a dome-shaped support structure. A bushing having a key slot and a key for the key slot is disposed between the dome-shaped support structure and the housing.