Dril-quip, Inc.

Neil B Prasad

Steven M Hafernik

Fife Baker Ellis

Systems and methods for pressure communication within a hydro-pneumatic cylinder are provided. The hydro-pneumatic cylinder generally includes a rod, a barrel coaxial to the rod, and a piston assembly disposed within the barrel and connected to the rod. The barrel is hollow to define a chamber, and the piston assembly is axially movable within the chamber to stroke the rod relative to the barrel. The hydro-pneumatic cylinder includes: a flow path formed axially through the rod of the cylinder. This flow path may allow for pressure communication between a low-pressure side of the cylinder and a pressure energized lower pin located at a distal end of the rod. The lower pin may be actuated, via this pressure communication to secure the end of the cylinder to a tension ring on a riser.

Hydro-pneumatic cylinder with annulus fluid bypass

An example deflection absorbing tensioner frame for a platform of an offshore vessel may include at least one metal beam supporting a tensioner. A deflection absorber may be coupled to at least one metal beam. The deflection absorber may be configured to absorb axial, rotational, and lateral deflections in a platform deck coupled to the deflection absorber.

Deflection absorbing tensioner frame

Improved methods and systems for connecting a riser tensioner system to a riser are disclosed. A system for coupling a tensioner cylinder to a riser includes a top pin connection disposed at a first distal end of the tensioner cylinder. The top pin connection couples the tensioner cylinder to a platform. The tensioner cylinder includes an extension rod and a bottom pin connection is disposed at a second distal end of the tensioner cylinder on the extension rod. A tension ring is coupled to the riser. An adjustable linkage system is coupled to the tensioner cylinder and includes an attachment mechanism and a positioning mechanism. The adjustable linkage system is operable to couple the tensioner cylinder to the tension ring.

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Houston, TX, United States of America

Neil B Prasad