Riser tensioner for an offshore platform
OwnerTom Bishop, Mark Klatt +2inventors
InventorsTom Bishop, Mark Klatt, Don Mullins, H. Wade Reed
Life of this patent
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Abstract
An upgraded riser tensioner (10) includes a cylinder end sheave body (12), a hydraulic cylinder (22), a rod (24) extending upward from the hydraulic cylinder, and upper sheave assembly (20) supported on the rod. A piston (26) is movable within the hydraulic cylinder. A blind end cover (22) is spaced at the lower end of the hydraulic cylinder. An adaptor plate (30) is spaced between the blind end cover and the cylinder and sheave body, and includes circumferentially spaced interior bolt holes and circumferentially spaced external bolt holes.
Claims20
An upgraded riser tensioner for an offshore vessel or platform, comprising:
- a cylinder end sheave body secured to the offshore platform, the cylinder end sheave body housing a lower sheave assembly;
- a hydraulic cylinder extending upward from the cylinder end sheave body;
- a rod extending upward from the hydraulic cylinder;
- an upper sheave assembly supported on the rod;
- a piston movable within the hydraulic cylinder and connected to the rod;
- a blind end cover spaced at a lower end of the hydraulic cylinder;
- and
- an adaptor plate spaced between the blind end cover and the cylinder end sheave body, the adaptor plate including internal bolt holes for bolting to the cylinder end sheave body, and external bolt holes for bolting the adaptor plate to the blind end cover.
An upgraded riser tensioner for an offshore vessel or platform, comprising:
- a cylinder end sheave body secured to the offshore platform, the cylinder end sheave body housing a lower sheave assembly;
- a hydraulic cylinder extending upward from the cylinder end sheave body;
- a rod extending upward from the hydraulic cylinder;
- an upper sheave assembly supported on the rod;
- a piston movable within the hydraulic cylinder and connected to the rod;
- a blind end cover fluidly closing off a lower end of the hydraulic cylinder;
- and
- an adaptor plate spaced between the blind end cover and the cylinder end sheave body, the adaptor plate including circumferentially spaced radially inner holes for attaching the hydraulic cylinder to the cylinder and sheave body, and circumferentially spaced radially outer holes for attaching the adaptor plate to the blind end cover.
A method of upgrading a riser tensioner for an offshore vessel or platform, the riser tensioner including a cylinder end sheave body secured to the offshore platform, the cylinder end sheave body housing a lower sheave assembly, a hydraulic cylinder extending upward from the cylinder end sheave body, a blind end cover spaced at a lower end of the hydraulic cylinder, a rod extending upward from the hydraulic cylinder, an upper sheave assembly supported on the rod, and a piston movable within the hydraulic cylinder and connected to the rod, the method comprising:
- spacing an adaptor plate between the blind end cover and the cylinder end sheave body, the adaptor plate including internal bolt holes and external bolt holes;
- bolting the adaptor plate to the cylinder end sheave body using the internal bolt holes;
- and
- bolting the adaptor plate to the blind end cover using the external bolt holes.
Dependencies are inferred from the claim text.