Fluid riser between seabed and floating vessel

Details Fluid riser between seabed and floating vessel Fluid riser between seabed and floating vessel

1994-02-18

1996-09-10

Taylor, Dennis L.

Hydraulic and earth engineering

Marine structure or fabrication thereof

37335, 138113, 166359, 166367, 405158, 405169, E02B 1700, E21B 1701

Patent

active

055539769

ABSTRACT:
An ocean riser assembly for conveying fluids between the seabed and the surface of the sea includes a fluid conveying pipe formed into a helical configuration or into a planar cyclically undulating configuration, such as a sinusoid, that extends longitudinally from the bottom of the sea to the surface. One or more flexible and preferably elastic tension members extend in the longitudinal direction of the riser assembly and are secured to the pipe at spaced intervals, so that they absorb tension forces applied between the ends of the riser assembly. The helical or undulating configuration of the riser pipe decouples axial stresses in the pipe caused by internal fluid pressure from stresses caused by external tension forces acting on the riser assembly, the external tension forces being converted to torque and bending moments acting on the pipe itself. This arrangement permits substitution of carbon steel pipe for flexible pipe, at substantial cost savings. The riser assembly can be used in very deep water, but it also is useful in shallow water, particularly in the planar undulating configuration of the fluid conveying pipe.

REFERENCES:
patent: 785263 (1905-03-01), MacDonell
patent: 3199553 (1965-08-01), Garrett et al.
patent: 3339512 (1967-09-01), Siegel
patent: 3817325 (1974-06-01), Mott et al.
patent: 4067202 (1978-01-01), Reed
patent: 4265567 (1981-05-01), Nybo
patent: 4362215 (1982-12-01), Sparks
patent: 4456073 (1984-06-01), Barth et al.

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