Abstract: A method for tensioning for oil and natural gas floating platforms and floating vessels using a plurality of self contained dual pressure cylinders for adjusting simultaneously low and high pressures in low pressure and high pressure channels. The method can be used on a floating structure to dampen the effects of sea waves and wind load between casing from a well and the floating structure.

Abstract: A tensioner system is described for oil and natural gas floating platforms and floating vessels having a plurality of self contained dual pressure cylinders for adjusting simultaneously low and high pressures in low pressure and high pressure channels, wherein the tensioner system is disposed on a floating structure to dampen the effects of sea waves and wind load between casing from a well and the floating structure due to movement of the sea and movement based on wind.

Abstract: A self contained dual pressure cylinder for use in tensioner assemblies for oil and natural gas floating vessels. The self contained dual pressure cylinder can have a high pressure outer barrel surrounding a high pressure inner barrel, forming a high pressure gas channel, a low pressure outer barrel surrounding a low pressure inner barrel, forming a low pressure fluid channel. A high pressure gas port connected to a high pressure gas reservoir, a low pressure fluid port connected to a low pressure gas reservoir, a low pressure fluid compression area connected to the low pressure fluid port, a hollow rod slidingly engaged each inner barrel, a dual pressure capture plate with moveable rod seals and moveable rod wear, a piston a low pressure elastomeric seal, a low pressure/high pressure separator, and a high pressure elastomeric seal.