Patent ID: 9701369
Date: 2017-07-11
CPC Classifications: B63B,E21B

Claim:
1. An offshore top site system comprising a floating unit configured to float at a water line and at least one transportation line extending from the floating unit, the floating unit has a bottom facing downwards and an outer periphery of the bottom defining a horizontal periphery of a vertical floating unit zone, the transportation line comprises a catenary riser section with an uppermost end and a top site section with a lowermost end, the catenary riser section and the top site section being in flow connection with each other, the catenary riser section has a length of at least about 1500 m, the transportation line further comprises a connection portion arranged between the top site section and the uppermost end of the riser section, the connection portion being pivotally connected to the floating unit, such that at least a major part of pulling force from the riser section is borne by the connection portion, wherein the connection portion between the uppermost end of the catenary riser section and the lowermost end of the top site section comprises a rigid section that is substantially nonlinear with respect to longitudinal axes of the catenary riser section and the top site section.