Abstract: Embodiments of the present disclosure include systems and methods with a piston cylinder arrangement comprising an inner barrel positioned within an outer barrel, the inner barrel being linearly moveable along an axis. A primary sealing assembly at an upper end of the outer barrel includes a plurality of seals positioned to block debris from entering an interior chamber. Additionally, an end cap is coupled to the inner barrel and an end cap diameter is greater than an inner barrel outer diameter. Moreover a secondary sealing assembly is arranged between the end cap and the primary sealing assembly and includes a plurality of secondary seals positioned to block debris from entering the interior chamber of the riser tensioner, wherein the secondary sealing assembly reduces a stroke length of the inner barrel when installed above the primary sealing assembly.

Abstract: Embodiments of the present disclosure include systems and methods with a piston cylinder arrangement comprising an inner barrel positioned within an outer barrel, the inner barrel being linearly moveable along an axis. A primary sealing assembly at an upper end of the outer barrel includes a plurality of seals positioned to block debris from entering an interior chamber. Additionally, an end cap is coupled to the inner barrel and an end cap diameter is greater than an inner barrel outer diameter. Moreover a secondary sealing assembly is arranged between the end cap and the primary sealing assembly and includes a plurality of secondary seals positioned to block debris from entering the interior chamber of the riser tensioner, wherein the secondary sealing assembly reduces a stroke length of the inner barrel when installed above the primary sealing assembly.

Abstract: Embodiments of the present disclosure include a riser tensioner includes a cylinder barrel, a rod reciprocally carried within the cylinder barrel and having an external end sealingly extending out of a proximal end of the cylinder barrel, and a piston on an interior end of the rod that slides and seals against an inner surface of the cylinder barrel. The tensioner further includes a selectively sealed low pressure chamber in the cylinder barrel between the piston and a distal end of the cylinder barrel and fillable with a low pressure fluid, and a selectively sealed annulus between the rod and the cylinder barrel, the annulus extending between the piston and the proximal end of the cylinder barrel and fillable with an annulus fluid at a pressure higher than the low pressure fluid, thereby urging the piston and rod towards retraction.

Abstract: Embodiments of the present disclosure include a riser tensioner includes a cylinder barrel, a rod reciprocally carried within the cylinder barrel and having an external end sealingly extending out of a proximal end of the cylinder barrel, and a piston on an interior end of the rod that slides and seals against an inner surface of the cylinder barrel. The tensioner further includes a selectively sealed low pressure chamber in the cylinder barrel between the piston and a distal end of the cylinder barrel and fillable with a low pressure fluid, and a selectively sealed annulus between the rod and the cylinder barrel, the annulus extending between the piston and the proximal end of the cylinder barrel and fillable with an annulus fluid at a pressure higher than the low pressure fluid, thereby urging the piston and rod towards retraction.

Abstract: A self-tensioning tendon for pulling a tension leg platform (TLP) down to a desired draft position. The self-tensioning tendon can be utilized with either a co-installation process or a pre-installation process and connects to an assembled tendon joint. The self-tensioning tendon comprises a hydraulically controlled Length Adjustment Joint (LAJ) that further comprises an integral cylinder with external threads and a piston rod. The self-tensioning apparatus has features that advantageously reduce the time required to ballast the hull of the TLP. A hydraulic source actuates the integral cylinder to pull the TLP down to the target draft position, significantly reducing the time needed to ballast the hull of the TLP with millions of gallons of water. A Top Tendon Connector (TTC) ratchets down along the cylinder to lock the TLP at the final draft position.

Abstract: A riser connector uses a box and upset pin connector threadform design having S-shaped load flanks that provide a variable load angles depending on the radial position along the engaged teeth. This design promotes a load path that changes with position along the axial length of the engaged thread, as well as increasing or decreasing external loads on the connector. The connector also varies radial distention of the pin from the box in a manner that is different from one thread to the next. The threadform uses a combination of thread cuts that vary in shape, pitch, and/or thread cone angle to provide load and stab flanks, as well as a load path, that vary from one axial end of the engaged thread to the other.

Abstract: A self-tensioning tendon for pulling a tension leg platform (TLP) down to a desired draft position. The self-tensioning tendon can be utilized with either a co-installation process or a pre-installation process and connects to an assembled tendon joint. The self-tensioning tendon comprises a hydraulically controlled Length Adjustment Joint (LAJ) that further comprises an integral cylinder with external threads and a piston rod. The self-tensioning apparatus has features that advantageously reduce the time required to ballast the hull of the TLP. A hydraulic source actuates the integral cylinder to pull the TLP down to the target draft position, significantly reducing the time needed to ballast the hull of the TLP with millions of gallons of water. A Top Tendon Connector (TTC) ratchets down along the cylinder to lock the TLP at the final draft position.

Abstract: A tendon bottom connector assembly has a receptacle with a bore having an annular locking profile divided into segments by axially extending slots. The connector has a housing that inserts into and locks in the receptacle. The housing and receptacle have mating an anti-rotation elements. The lock ring has an outer surface with an annular locking profile divided into segments by axially extending slots. The lock ring is carried by the housing initially in the installation position with its segments aligned with the slots of the receptacle. This position allows the housing to be fully inserted into the receptacle. An ROV then rotates the ring from the installation position to a locked position, with the segments of the lock ring engaging the segments of the receptacle. Alternately, a split ring with one end fixed rotates the lock ring.

Abstract: A riser connector uses a box and upset pin connector threadform design having S-shaped load flanks that provide a variable load angles depending on the radial position along the engaged teeth. This design promotes a load path that changes with position along the axial length of the engaged thread, as well as increasing or decreasing external loads on the connector. The connector also varies radial distention of the pin from the box in a manner that is different from one thread to the next. The threadform uses a combination of thread cuts that vary in shape, pitch, and/or thread cone angle to provide load and stab flanks, as well as a load path, that vary from one axial end of the engaged thread to the other.

Abstract: A riser connector uses a box and upset pin connector threadform design having S-shaped load flanks that provide a variable load angles depending on the radial position along the engaged teeth. This design promotes a load path that changes with position along the axial length of the engaged thread, as well as increasing or decreasing external loads on the connector. The connector also varies radial distention of the pin from the box in a manner that is different from one thread to the next. The threadform uses a combination of thread cuts that vary in shape, pitch, and/or thread cone angle to provide load and stab flanks, as well as a load path, that vary from one axial end of the engaged thread to the other.

Abstract: A tendon bottom connector assembly has a receptacle with a bore having an annular locking profile divided into segments by axially extending slots. The connector has a housing that inserts into and locks in the receptacle. The housing and receptacle have mating an anti-rotation elements. The lock ring has an outer surface with an annular locking profile divided into segments by axially extending slots. The lock ring is carried by the housing initially in the installation position with its segments aligned with the slots of the receptacle. This position allows the housing to be fully inserted into the receptacle. An ROV then rotates the ring from the installation position to a locked position, with the segments of the lock ring engaging the segments of the receptacle. Alternately, a split ring with one end fixed rotates the lock ring.