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.

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.

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.

Wakeboat propulsion apparatuses are provided that can include: a wakeboat having a hull; an engine mounted to the hull; a hydraulic pump driven by the engine; a hydraulic motor powered by the hydraulic pump; and a propeller powered by the hydraulic motor. Methods for propelling a wakeboat are also provided. The methods can include: engaging a hydraulic pump from a drive of an engine operationally mounted to a hull of the wakeboat; driving a hydraulic motor with hydraulic fluid received from the hydraulic pump; and operationally engaging a propeller using the hydraulic motor.

Wakeboat propulsion apparatuses are provided that can include: a wakeboat having a hull; an engine mounted to the hull; a hydraulic pump driven by the engine; a hydraulic motor powered by the hydraulic pump; and a propeller powered by the hydraulic motor. Methods for propelling a wakeboat are also provided. The methods can include: engaging a hydraulic pump from a drive of an engine operationally mounted to a hull of the wakeboat; driving a hydraulic motor with hydraulic fluid received from the hydraulic pump; and operationally engaging a propeller using the hydraulic motor.

A diphase stainless steel chemical vessel ballast cabin bulkhead includes a front cover, a rear cover and reinforced string boards. The front cover and the rear cover are distributed parallel with each other. The front cover and the rear cover are inter-connected by the reinforced string boards. The reinforced string board includes a deformation groove and connection plates, and the connection plates are distributed on two sides of the deformation groove symmetrically with respect to a central line of the deformation groove. The reinforced string boards are evenly distributed between the front cover and the rear cover; the reinforced string boards and an axis of the front cover and the rear cover are distributed parallel. Adjacent reinforced string boards are mutually connected. A thickness of the front cover is at least one time thicker than that of the rear cover. The processing method thereof includes three steps.

A diphase stainless steel chemical vessel ballast cabin bulkhead includes a front cover, a rear cover and reinforced string boards. The front cover and the rear cover are distributed parallel with each other. The front cover and the rear cover are inter-connected by the reinforced string boards. The reinforced string board includes a deformation groove and connection plates, and the connection plates are distributed on two sides of the deformation groove symmetrically with respect to a central line of the deformation groove. The reinforced string boards are evenly distributed between the front cover and the rear cover; the reinforced string boards and an axis of the front cover and the rear cover are distributed parallel. Adjacent reinforced string boards are mutually connected. A thickness of the front cover is at least one time thicker than that of the rear cover. The processing method thereof includes three steps.

Wakeboat ballast compartment fluid level sensing assemblies are provided that can include: a wakeboat having a hull; a ballast compartment associated with the hull; a nonconductive sensor chamber in fluidic communication with the ballast compartment; and at least one conductive electrode associated with the sensor chamber. Methods for sensing a fluid level within a ballast compartment aboard a wakeboat are also provided. The methods can include maintaining fluid communication between the ballast compartment and a sensor chamber; and determining the electrical communication of electrodes operatively associated with the sensor chamber.

Wakeboat ballast compartment fluid level sensing assemblies are provided that can include: a wakeboat having a hull; a ballast compartment associated with the hull; a nonconductive sensor chamber in fluidic communication with the ballast compartment; and at least one conductive electrode associated with the sensor chamber. Methods for sensing a fluid level within a ballast compartment aboard a wakeboat are also provided. The methods can include maintaining fluid communication between the ballast compartment and a sensor chamber; and determining the electrical communication of electrodes operatively associated with the sensor chamber.

Wakeboat ballast compartment fluid level sensing assemblies are provided that can include: a wakeboat having a hull; a ballast compartment associated with the hull; a nonconductive sensor chamber in fluidic communication with the ballast compartment; and at least one conductive electrode associated with the sensor chamber. Methods for sensing a fluid level within a ballast compartment aboard a wakeboat are also provided. The methods can include maintaining fluid communication between the ballast compartment and a sensor chamber; and determining the electrical communication of electrodes operatively associated with the sensor chamber.