A ballast seal for a sealing ring includes: a substantially annular potential equalization ring made of an electrically-conductive material and which can be brought into contact in a sealing manner with a surface to be sealed of a machine element to be sealed; and at least one shielding ring made of a soft magnetic material so as to shield against electromagnetic interfering waves.

An aquaculture production and/or transfer system is provided and comprises: at least one floating aquaculture production apparatus on a novel offshore advanced hull system of varying shapes for closed containment method and ecological friendly for sustainable floating farming system (which may be marketed under Eco-Ark™); a station keeping apparatus coupled to the aquaculture production apparatus; a custodian transfer apparatus having a custodian chamber, a chute and a pump, wherein the custodian chamber is fluidly coupled to at least one of the tanks to receive live aquatic animals therefrom, wherein the chute is configured to transfer live aquatic animals to an amalgamated facility.

An aquaculture production and/or transfer system is provided and comprises: at least one floating aquaculture production apparatus on a novel offshore advanced hull system of varying shapes for closed containment method and ecological friendly for sustainable floating farming system (which may be marketed under Eco-Ark™); a station keeping apparatus coupled to the aquaculture production apparatus; a custodian transfer apparatus having a custodian chamber, a chute and a pump, wherein the custodian chamber is fluidly coupled to at least one of the tanks to receive live aquatic animals therefrom, wherein the chute is configured to transfer live aquatic animals to an amalgamated facility.

The present invention relates to a curve-combined square pressure tank with which curves are combined so as to maintain internal high pressure, improve space efficiency, and reduce the weight thereof, and to a pressure tank, in which planes and curves are combined, formed by connecting flat plate members and curved members, having a plurality of aligned tension members for connecting the flat plate members facing each other, and having stress buffer parts formed at connection parts of the flat plate members and the curved members so as to enable internal pressure to be maintained.

The present invention relates to a curve-combined square pressure tank with which curves are combined so as to maintain internal high pressure, improve space efficiency, and reduce the weight thereof, and to a pressure tank, in which planes and curves are combined, formed by connecting flat plate members and curved members, having a plurality of aligned tension members for connecting the flat plate members facing each other, and having stress buffer parts formed at connection parts of the flat plate members and the curved members so as to enable internal pressure to be maintained.

The present disclosure describes recreational watercraft that provide a ballast system and an open platform passenger deck. An example is an aluminum hull including a ballast system to regulate displacement by the recreational watercraft and an open platform passenger deck as an integral upper surface to the aluminum hull. Multiple sides, continuous from the aluminum hull, include a stern side, a bow side, a port side, and a starboard side that surround a perimeter of the open platform passenger deck. An inboard power plant is located within a stern portion of the aluminum hull to propel the recreational watercraft.

The present disclosure describes recreational watercraft that provide a ballast system and an open platform passenger deck. An example is an aluminum hull including a ballast system to regulate displacement by the recreational watercraft and an open platform passenger deck as an integral upper surface to the aluminum hull. Multiple sides, continuous from the aluminum hull, include a stern side, a bow side, a port side, and a starboard side that surround a perimeter of the open platform passenger deck. An inboard power plant is located within a stern portion of the aluminum hull to propel the recreational watercraft.

The present disclosure describes recreational watercraft that provide a ballast system and an open platform passenger deck. An example is an aluminum hull including a ballast system to regulate displacement by the recreational watercraft and an open platform passenger deck as an integral upper surface to the aluminum hull. Multiple sides, continuous from the aluminum hull, include a stern side, a bow side, a port side, and a starboard side that surround a perimeter of the open platform passenger deck. An inboard power plant is located within a stern portion of the aluminum hull to propel the recreational watercraft.

The present disclosure describes recreational watercraft that provide a ballast system and an open platform passenger deck. An example is an aluminum hull including a ballast system to regulate displacement by the recreational watercraft and an open platform passenger deck as an integral upper surface to the aluminum hull. Multiple sides, continuous from the aluminum hull, include a stern side, a bow side, a port side, and a starboard side that surround a perimeter of the open platform passenger deck. An inboard power plant is located within a stern portion of the aluminum hull to propel the recreational watercraft.

Recreational watercraft and methods of operating recreational watercraft are described. Recreational watercraft can include an aluminum hull, a plurality of ballast tanks, a first surface defining a first opening that extends from an interior of a ballast tank of the plurality of ballast tanks to an exterior of the hull, a valve configured to selectively open or close the first opening, and a second surface defining a second opening that is fixed permanently open and extends from an interior of the ballast tank through a bottom portion of the hull to an exterior of the hull.