Patent ID: 7712539

Claim:
Riser for connection between a floating structure and a seabed connection point on or near the seabed for transport of fluids, electric power, signals, or combinations thereof, comprising a substantially rigid bottom riser arm and a substantially rigid top riser arm which are substantially straight in an unloaded condition, wherein the rigid bottom riser arm is connected to the rigid top riser arm by a rigid bend having a fixed angle of approximately 90 degrees, and wherein the rigid top riser arm extends from the bend to the floating structure, said floating structure being arranged such that in a neutral position (N), a vertical line drawn from the structure connection point of the rigid top riser arm with the floating structure will intersect the sea bed at a point on a same side of the rigid bottom riser as the seabed connection point, and further wherein the rigid bottom riser arm rests upon the seabed from the seabed connection point that is located on or near the seabed to a transition point intermediate said seabed connection point and the bend, said transition point being immediately prior to the point at which the rigid bottom riser arm is lifted from the seabed, which transition point changes dependent upon the position of the floating structure, said transition point further being approximately on a vertical line from the structure connection point to the floating structure when the structure is in the neutral position (N), said riser further comprising at least one elastic element extending from the bend to an anchor on the seabed in a distance from the bend such that the bend is located intermediate the seabed connection point on or near the seabed and the anchor.