774results about "Self-bailing equipments/scuppers" patented technology

A ballast water treatment device which can meet the ballast water standard stipulated by IMO at low cost with certainty. Provided is a ballast water treatment device comprising: a filter unit (4) for filtering seawater to capture aquatic organisms; a bactericide supply unit (5) for supplying a bactericide to the filtered seawater; And Venturi tube (7), this tube is used for introducing the seawater that adds bactericide, and produces cavitation in seawater, thus has not only diffused bactericide but also kills or kills the aquatic organisms of seawater.

A target biokill of species for water to be discharged from a ballast tank of a sea faring vessel is determined. A diverted portion of sea water is regulated prior to charging the water into the ballast tank. Regulation of the diverted portion of water and a rate of injection of the ozone into the portion are adjusted to attain the target biokill. Then ozone at the determined rate into the regulated diverted portion to attain the target biokill when the portion is recombined into the water for charging to the ballast tank.

The invention relates to a method and system for preventing corrosion of at least one metallic structure in an electrolyte medium, comprising applying a superimposed time-varying frequency electromagnetic wave to the structure, the method comprising the steps of generating a superimposed time-varying frequency electromagnetic wave (DAC wave) where an AC driving signal with time-varying frequency is riding on a DC output with a predefined DC bias voltage, transmitting the DAC wave current to one or more emitters, emitting the DAC wave via the one or more emitters, placing the one or more emitters at a spaced distance from the metallic structure, subjecting the metallic structure to the DAC wave current, controlling the negative return current of the DAC wave from the metallic structure, such that the DAC wave is distributed across the structure surface and directly excites a target region of the metallic structure, and wherein the excitation induces a flow of ionic current having a DC component travelling in a pulsating and time-varying manner in the target region and effects induced vibration of electrons and molecules in the target region. The method and the system of the invention significantly reduce capital costs and require very low energy, they avoid environmentally unfriendly final products, and are able to result in effective corrosion protection of metallic structures in different surrounding conditions.

An adjustable surf wake system enhances a wake formed by a watercraft travelling through water. The system may include a flap for deflecting water traveling past the stern of the watercraft, and / or a positioner operably connected to the flap for positioning the flap relative to a longitudinal axis of the watercraft between a neutral position and an outward position. Positioning a port flap in its extended position enhances a starboard surf wake, and positioning the starboard flap in its extended position enhances a port surf wake.

Ballast water treatment apparatus and methods for preventing foreign aquatic invasive species form entering marine ecological zones by translocation in ship's ballast water. The apparatus includes a housing, a filter member, and UV water treatment chambers. Methods include use of a ship's fire hydrant system for moving ballast water from the ship's ballast tanks into the apparatus for filtration and treatment. In-port service vessels and dock-side service vehicles are equipped with the treatment and filtration apparatus to provided in-port or dock-side ballast water treatment services. Related methods are also provided.

A method and system treat ballast-water with ozone without release of detrimental off-gas into the atmosphere.