Abstract: A buoyancy system for deep-water risers of a deep water floating platforms includes an ecto-skeleton formed by a plurality of members to withstand lateral and bending loads, and a buoyant vessel disposed in an interior cavity of the ecto-skeleton to resist pressure loads. The member of the ecto-skeleton can include hollow tubular members having hollow interiors with a buoyant material disposed in the hollow interiors of the tubular members.

Abstract: A buoyancy system for deep-water risers of a deep water floating platforms includes an ecto-skeleton formed by a plurality of members to withstand lateral and bending loads, and a buoyant vessel disposed in an interior cavity of the ecto-skeleton to resist pressure loads. The member of the ecto-skeleton can include hollow tubular members having hollow interiors with a buoyant material disposed in the hollow interiors of the tubular members.

Abstract: An electro-hydraulic control system for subsea wellheads provides a water tight housing carrying therewithin an electric motor drive which operates a valve that is positioned adjacent but outside the water tight housing. A high ratio gear box within the water tight housing interfaces the motor drive and the valve while maintaining the flow control position of the valve such as open flow, closed flow, or incremental flow opening positions of the valving member. A dual tone multi-frequency controller activates the electric motor drive using a key pad at a remote location so that both operation of the valve and an indication of valve position can be achieved from the remote location.