Multiple bore marine riser with flexible reinforcement
AssigneeShell Oil Company
InventorGerhardus C. Van der Graaf
Life of this patent
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Abstract
A multiple bore marine riser adapted to form a communication between equipment on a floating structure and pipelines on the sea bottom includes flexible reinforcement means to prevent the occurrence of high bending stresses in the flowlines of the riser when the latter is subjected to large bending forces.
Claims9
A multiple bore marine riser including a plurality of parallel flowlines, an assembly of rods extending parallel to the assembly of flowlines over part of the length thereof, wherein cross-sectional diameters of the individual rods vary along the length of the rods, a plurality of rigid horizontal spacer plates arranged between the assemblies of flowlines and rods, said plates being arranged in vertically-spaced relationship to each other over a selected section of the length thereof, and coupling means operatively connecting the individual rods and flowlines to the plates allowing a pivotal movement of the flowlines and the rods with respect to the plates at the coupling means that is about an axis taken normal to the longitudinal axis of the flowlines and rods.
Dependencies are inferred from the claim text.