Hydraulic and earth engineering – Marine structure or fabrication thereof – Structure protection
Reexamination Certificate
2006-09-19
2006-09-19
Singh, Sunil (Department: 3673)
Hydraulic and earth engineering
Marine structure or fabrication thereof
Structure protection
C405S211000, C114S14400A, C114S06700A, C114S06700A
Reexamination Certificate
active
07108457
ABSTRACT:
A marine riser that includes active boundary-layer control (“BLC”) for reducing hydrodynamic drag and vortex-induced-vibration (“VIV”) caused by currents. The marine riser includes at least one riser pipe surrounded by a BLC sheath. Extending through the sheath is at least one nozzle, preferably at least one pair of slot-nozzles, for discharging water into the sea in which the marine riser is deployed. The BLC sheath may be rotate-able to align a pair of slit-nozzles with the current direction, or in a fixed BLC sheath, pairs of slot-nozzles may be selectively activated based on the current direction. The BLC sheath may also include a tail-jet or retractable tail-fin. The BLC sheath may be formed from telescoping sections that decrease in diameter toward the bottom of the riser and that are nested when the telescoping sheath is retracted. Finally, a BLC system may also be implemented in a production riser system.
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Brown Neal A.
Grinius Victor G.
Shaar Cam M.
High Seas Engineering LLC
Singh Sunil
LandOfFree
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