Patent ID: 6503022
Filing Date: 2003-01-07
Classification: B63B

Abstract:
A vessel, comprising:(a) a moon pool positioned in the center of the vessel; (b) a buoyant moon pool plug adapted to have controllable positive and negative buoyancy; said plug comprising: a top; a cover; a bottom; a first angled side; a second angled side; a third angled side; a fourth angled side; first plates disposed traversely across the bottom of said plug; and second plates disposed perpendicular to said first plates across the bottom of said plug; (c) a water valve secured to said top for permitting sea water to egress from said plug; (d) an air valve secured to said top for permitting air to be pumped into said plug; (e) guide means secured to said plug to guide said plug into said moon pool; and (d) hoisting means secured to said plug to lift said plug into the deck of said vessel.