Abstract: A threaded connection having a straight central axis, where the pin threads and the box threads are arranged such that when the connection is fully made up, the pin roots and box crests come into at least partial interference substantially in line with a pin root taper plane and a box crest taper plane, and wherein the angles of the pin root taper plane and box crest taper plane allow for reduction of axial compressive forces on the plurality of pin threads and plurality of box threads along the central axis.

Abstract: A threaded connection including a pin with a plurality of pin threads, the plurality of threads comprising a plurality of pin crests and pin roots; and a box with a plurality of box threads, the box threads comprising a plurality of box crests and box roots, where the plurality of box roots and the plurality of pin crests are parallel to a horizontal axis, and where the plurality of pin roots are parallel to and collinear with a pin root taper plane, the pin root taper plane being not parallel to the horizontal axis creating at least one void space upon make-up of the threaded connection between the plurality of pin crests and the plurality of box roots, and at least one void space upon make-up between the plurality of pin roots and box crests.

Abstract: A threaded connection including a pin with a plurality of pin threads, the plurality of threads comprising a plurality of pin crests and pin roots; and a box with a plurality of box threads, the box threads comprising a plurality of box crests and box roots, where the plurality of box roots and the plurality of pin crests are parallel to a horizontal axis, and where the plurality of pin roots are parallel to and collinear with a pin root taper plane, the pin root taper plane being not parallel to the horizontal axis creating at least one void space upon make-up of the threaded connection between the plurality of pin crests and the plurality of box roots, and at least one void space upon make-up between the plurality of pin roots and box crests.

Abstract: A threaded connection having a straight central axis, where the pin threads and the box threads are arranged such that when the connection is fully made up, the pin roots and box crests come into at least partial interference substantially in line with a pin root taper plane and a box crest taper plane, and wherein the angles of the pin root taper plane and box crest taper plane allow for reduction of axial compressive forces on the plurality of pin threads and plurality of box threads along the central axis.

Abstract: A threaded connection having a straight central axis, the connection including a plurality of pin threads, each pin thread having a root and a crest, and a box having a plurality of box threads, each box thread having a root and a crest. The crests of at least a portion of the box threads are curved so that when the pin threads are fully engaged with the box threads, there is a void between the roots of the pin threads and the corresponding curved crests of the box threads to reduce standoff caused by lubricant or other fluids becoming trapped between the threads as the connection is made up.

Abstract: An apparatus for assembling a positive seal coupling and a pipe, including a frame, a stationary block assembly attached to the frame and having coupling gripping doors, and a traveling block assembly slidably attached to the frame and having pipe gripping doors. Two hydraulic ram cylinders are attached to the frame that have ram cylinder rods attached to the traveling block assembly so that the hydraulic ram cylinders can move the traveling block assembly toward the stationary block assembly. The coupling gripping doors are axially aligned with the pipe gripping doors so that when the hydraulic ram cylinders move the traveling block assembly toward the stationary block assembly, a pipe held by the pipe gripping doors is inserted into a coupling held by the coupling gripping doors.

Abstract: A hollow coupling for joining together two pipe ends and having a center, two coupling ends, and an inner profile. The inner profile can include a serrated section having a plurality of threads extending radially around the inner diameter of the coupling, a curved section proximate the serrated section and defining a recess for the deposition of debris and other material during installation of a pipe into the coupling, a smooth section adjacent an end of the coupling and having a diameter slightly less than the outside diameter of a pipe to be inserted into the coupling, and a transition section between the curved section and the smooth section, the transition section having a smooth, rounded profile that minimizes stress concentrations.

Abstract: A hollow coupling for joining together two pipe ends and having a center, two coupling ends, and an inner profile. The inner profile can include a serrated section having a plurality of threads extending radially around the inner diameter of the coupling, a curved section proximate the serrated section and defining a recess for the deposition of debris and other material during installation of a pipe into the coupling, a smooth section adjacent an end of the coupling and having a diameter slightly less than the outside diameter of a pipe to be inserted into the coupling, and a transition section between the curved section and the smooth section, the transition section having a smooth, rounded profile that minimizes stress concentrations.

Abstract: An apparatus for assembling a positive seal coupling and a pipe, including a frame, a stationary block assembly attached to the frame and having coupling gripping doors, and a traveling block assembly slidably attached to the frame and having pipe gripping doors. Two hydraulic ram cylinders are attached to the frame that have ram cylinder rods attached to the traveling block assembly so that the hydraulic ram cylinders can move the traveling block assembly toward the stationary block assembly. The coupling gripping doors are axially aligned with the pipe gripping doors so that when the hydraulic ram cylinders move the traveling block assembly toward the stationary block assembly, a pipe held by the pipe gripping doors is inserted into a coupling held by the coupling gripping doors.