Abstract: A small waterplane area twin hull (SWATH) vessel is disclosed which includes a pair of normally submerged hulls that provide buoyancy support for the vessel. An upper hull platform located above the design water line of the vessel is connected to the submerged hulls by at least two pairs of struts respectively associated with each of the submerged hulls. The submerged hulls are arranged to define an acute angle between them. In one embodiment the vertex of the angle is rearward of the submerged hull and in another embodiment it is forward of the submerged hull. In other embodiments of the invention the struts are arranged to define dihedral angles between the struts and the upper hull platform. In addition, the struts may be angled with respect to the center line of the vessel.

Abstract: A seawater deaerator has a large reservoir through which seawater slowly flows. Gas is injected into the bottom of the reservoir through porous aeration stones forming bubble nuclei. The seed bubbles move upward through the seawater in the reservoir expanding but not coalescing, and withdrawing dissolved gas from the seawater. The deaerated seawater flows out of the reservoir and subsequently flows through spouts into a flash evaporator. Gas is withdrawn from a low pressure gas chamber at the top of the reservoir by a vacuum pump. The exhaust of the vacuum pump supplies gas to the air injectors.

Abstract: A seawater deaerator has a large reservoir through which seawater slowly flows. Gas is injected into the bottom of the reservoir through porous aeration stones forming bubble nuclei. The seed bubbles move upward through the seawater in the reservoir expanding but not coalescing, and withdrawing dissolved gas from the seawater. The deaerated seawater flows out of the reservoir and subsequently flows through spouts into a flash evaporator. Gas is withdrawn from a low pressure gas chamber at the top of the reservoir by a vacuum pump. The exhaust of the vacuum pump supplies gas to the air injectors.