Patent ID: 6517291
Filing Date: 2003-02-11
Classification: B63B,E21B

Abstract:
A vessel (50, 74) comprising:a riser or tendon tensioning construction having at least two spaced apart pivot points (53, 54, 75, 76), each of the pivot points carrying a pivot arm (51, 52; 70, 71), the pivot arms being pivotable about two parallel, spaced apart pivot axes going through said pivot points (53, 54; 75, 76); a connector (55, 67) carrying two or more risers or tendons (61, 60; 72, 73) which are with one end attached to the seabed and with the other end attached to the connector, the connector being suspended between the pivot points; and dead counterweights that each provide a passive and substantially constant force acting on a respective one of the pivot arms for exerting tension on the risers or tendons, wherein the pivot arms (51, 52; 75, 76) are with their first ends (62, 63; 77, 78) attached to respective positions on the connector (55, 67).