A ballast water treatment apparatus equipped with devices for injecting bromine salt and ozone includes a ballast pipe, a ballast pump, a bromine salt injection part and an ozone processor, wherein the injection part includes a bromine salt storage tank; a bromine salt transfer pipe connected to the ballast pipe for injecting bromine salt supplied from the bromine salt storage tank into the ballast pipe; and a bromine salt injection pump in the transfer pipe for pressurizing bromine salt to be injected into the ballast pipe, and the ozone processor includes an ozone injection device for supplying ozone to the ballast pipe; a mixer in the ballast pipe for mixing ozone supplied from the ozone injection device and seawater transferred into the ballast pipe; and an ozone transfer pipe connected to the mixer of the ballast pipe for injecting ozone supplied from the ozone injection device into the ballast pipe.

Embodiments include a retrofit pontoon system including a pontoon, the pontoon having a pontoon body defining a first cavity, the pontoon body having a first aperture; a retrofit assembly, the retrofit assembly including a selectively fillable container sized to pass through the first aperture; and a pump. The pump is operably coupled with the selectively fillable container such that operation of the pump selectively fills and drains water from the selectively fillable container, wherein filling the selectively fillable container lowers the profile of the pontoon in the water and emptying the selectively fillable container raises the profile of the pontoon in the water.

Embodiments include a retrofit pontoon system including a pontoon, the pontoon having a pontoon body defining a first cavity, the pontoon body having a first aperture; a retrofit assembly, the retrofit assembly including a selectively fillable container sized to pass through the first aperture; and a pump. The pump is operably coupled with the selectively fillable container such that operation of the pump selectively fills and drains water from the selectively fillable container, wherein filling the selectively fillable container lowers the profile of the pontoon in the water and emptying the selectively fillable container raises the profile of the pontoon in the water.

A slide-in structural interface between a Sea Water Intake Riser (SWIR) and a floating unit hull or sump tank bottom plate permits a pull-in, diver-less installation of the SWIR. Certain embodiments include an integrated, easily maintainable strainer.

A slide-in structural interface between a Sea Water Intake Riser (SWIR) and a floating unit hull or sump tank bottom plate permits a pull-in, diver-less installation of the SWIR. Certain embodiments include an integrated, easily maintainable strainer.

A method for controlling a propulsion operation of a propulsion unit to reach a desired speed of a marine vessel. The method comprises obtaining a target speed configuration indicating the desired speed of the marine vessel, obtaining a current speed value associated with a current speed of the marine vessel, obtaining a fill level value associated with a fill level of one or more ballast tanks of the marine vessel, and controlling the propulsion operation of the propulsion unit to reach the desired speed based on the target speed configuration, the current speed value, and on the fill level value.

A method for controlling a propulsion operation of a propulsion unit to reach a desired speed of a marine vessel. The method comprises obtaining a target speed configuration indicating the desired speed of the marine vessel, obtaining a current speed value associated with a current speed of the marine vessel, obtaining a fill level value associated with a fill level of one or more ballast tanks of the marine vessel, and controlling the propulsion operation of the propulsion unit to reach the desired speed based on the target speed configuration, the current speed value, and on the fill level value.

A personal water craft includes a hull; a deck attached to, or integral with, the hull; a foot well having a foot well floor that is configured to receive a foot of a user of the personal water craft; and a drainage system configured to drain liquid from the foot well, the drainage system having a tube extending from the foot well floor to a location outside the hull.

A ballast and de-ballast system and method for an articulated tug barge (ATB) or integrated tug barge (ITB) are described herein. The system includes a tug ballast tank located on the tug, the tug ballast tank being configured to hold ballast water; and a barge trim tank located on the barge, the barge trim tank being configured to hold ballast water. The system further includes at least one umbilical line connecting the tug ballast tank to the barge trim tank. The system is configured to transfer ballast water between the tug ballast tank and the barge trim tank via the at least one umbilical line.

A ballast and de-ballast system and method for an articulated tug barge (ATB) or integrated tug barge (ITB) are described herein. The system includes a tug ballast tank located on the tug, the tug ballast tank being configured to hold ballast water; and a barge trim tank located on the barge, the barge trim tank being configured to hold ballast water. The system further includes at least one umbilical line connecting the tug ballast tank to the barge trim tank. The system is configured to transfer ballast water between the tug ballast tank and the barge trim tank via the at least one umbilical line.