Ships – Floating platform
Patent
1978-05-01
1982-09-28
Blix, Trygve M.
Ships
Floating platform
175 5, 175 27, 92 10, 92143, 267126, B63B 3544
Patent
active
043512615
ABSTRACT:
A recoil system and method for supporting a marine riser which is extended from offshore well head equipment to a floating platform are disclosed. The purpose of the recoil system is to prevent a violent collisin of the riser with the platform when the riser becomes separated from the well head equipment during a planned or an emergency disconnect operation. Upon disconnection of the riser from the well head equipment, the lifting force applied to the riser is reduced to a predetermined lower level and the riser is retracted to an elevated position above the well head equipment to permit unobstructed excursions of the riser. A variable lifting force is applied to the riser to maintain the riser substantially in equilibrium in the retracted position as the floating platform heaves relative to the riser in response to wave action. The riser is supported by a tensioner assembly which includes a hydraulic cylinder having a housing member attached to the platform, a movable piston dividing the housing member into a high pressure hydraulic chamber and a low pressure hydraulic chamber, and a rod connected to the piston and coupled to the riser for applying a lifting force to the riser in response to pressurization of the hydraulic pressure chamber. Collision of the riser against the floating platform is prevented by apparatus which includes a reservoir of compressed gas and a valve connected intermediate the compressed gas reservoir and the low pressure hydraulic chamber for selectively applying a pneumatic or pneumatic over hydraulic pressure load to the piston in opposition to the hydraulic pressure load when the riser is disconnected from the well head equipment.
REFERENCES:
patent: 3653635 (1972-04-01), Bates et al.
patent: 3687205 (1972-08-01), Mori
patent: 3714995 (1973-02-01), Hanes et al.
patent: 3943868 (1976-03-01), Person et al.
patent: 3983706 (1976-10-01), Kalinowski
patent: 4004532 (1977-01-01), Reynolds
Blix Trygve M.
SEDCO, Inc.
Sotelo Jesus D.
LandOfFree
Riser recoil preventer system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Riser recoil preventer system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Riser recoil preventer system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-395277