Pipe transfer system

Abstract

This invention provides apparatus for use on, for example, an ocean mining surface vessel, for transporting lengths of pipe from a horizontal storage rack to a main dredge line hoist, which vertically supports connected lengths of pipe from the ocean surface to the ocean floor. The apparatus includes a track between the storage rack and the dredge line support system, the track being supported at one end adjacent the storage rack and at the second end adjacent the main dredge line hoist. The main dredge line hoist being preferably supported on a platform which is pivotally connected to the vessel about at least two transverse axes. The track also preferably is segmented, the segment closest to the main dredge line hoist support being pivotable about two transverse axes relative to the pipe rack on the vessel. Preferably, the two segments of track can be connected through a vertical pivot and/or a horizontal pivot or about two horizontal pivots. Carriages, riding along the track, support each end of a pipe being transported from the rack to the main hoist support. The main hoist support further comprises an elevator for raising a horizontally supported pipe to a vertical position above the dredge line so that the lower end of the pipe can be connected to the dredge line. Further, preferably, the track is longitudinally movable and the carriages are driven along the track.