Abstract: An installation of bottom-to-surface connections of at least two undersea pipes (11-1, 11-2) resting on the sea bottom (10), and a rigid pipe (1-1, 1-2) constituted by a vertical riser having its bottom end (1a) fastened to a base (9-1, 9-2) at the sea bottom (10), and having its top end (1b) tensioned by an immersed float (4-1, 4-2); and a flexible connection pipe (2-1, 2-2) providing the connection between a common floating support (12) and the top end (1b) of the vertical riser via a junction device (3-1, 3-2; wherein two hybrid towers are connected together by at least one rigid separator bar (5) having a length not less than the diameter of the larger-diameter float.

Abstract: An installation of bottom-to-surface connections of at least two undersea pipes (11-1, 11-2) resting on the sea bottom (10), and a rigid pipe (1-1, 1-2) constituted by a vertical riser having its bottom end (1a) fastened to a base (9-1, 9-2) at the sea bottom (10), and having its top end (1b) tensioned by an immersed float (4-1, 4-2); and a flexible connection pipe (2-1, 2-2) providing the connection between a common floating support (12) and the top end (1b) of the vertical riser via a junction device (3-1, 3-2; wherein two hybrid towers are connected together by at least one rigid separator bar (5) having a length not less than the diameter of the larger-diameter float.

Abstract: An installation of bottom-to-surface connections having a plurality of bottom-to-surface connections arranged in a fan from a common floating support. The installation having a first number k of first bottom-to-surface connections, with each first number of connections having a first riser connected to a first undersea pipe tensioned in substantially vertical manner by a first float, and a diving first flexible connection pipe connecting the floating support and first riser. The installation further having a second number m of second bottom-to-surface connection, with each second number of connections having a second rigid pipe connected to a second undersea pipe and tensioned by a second buoyancy element, and a second flexible connection pipe providing the connection between the floating support and the second rigid pipe.

Abstract: An installation of bottom-to-surface connections having a plurality of bottom-to-surface connections arranged in a fan from a common floating support. The installation having a first number k of first bottom-to-surface connections, with each first number of connections having a first riser connected to a first undersea pipe tensioned in substantially vertical manner by a first float, and a diving first flexible connection pipe connecting the floating support and first riser. The installation further having a second number m of second bottom-to-surface connection, with each second number of connections having a second rigid pipe connected to a second undersea pipe and tensioned by a second buoyancy element, and a second flexible connection pipe providing the connection between the floating support and the second rigid pipe.