Hydro excavation vacuum apparatus that process spoil material onboard the apparatus by separating water from the cut earthen material are disclosed.

Hydro excavation vacuum apparatus that process spoil material onboard the apparatus by separating water from the cut earthen material are disclosed.

Hydro excavation vacuum apparatus that process spoil material onboard the apparatus by separating water from the cut earthen material are disclosed.

Hydro excavation vacuum apparatus that process spoil material onboard the apparatus by separating water from the cut earthen material are disclosed.

A suction excavator includes a suction hose with a suction opening for pneumatically receiving solid or liquid suction material using a fast-flowing air stream. The suction excavator has a separator for separating the suction material from the air stream, a filter unit for cleaning the air stream, a fan unit for generating the air stream, and a recirculation channel that is connected to the pressure side of the fan unit via a volume-controllable recirculation opening. A volume-controllable secondary air opening allows secondary air from the surroundings to be supplied to the suction side of the fan unit, downstream from the filter unit in the flow direction. The recirculation channel is fluidically coupleable to the suction hose to generate a positive pressure in the recirculation channel to blow out recirculation air through the suction hose.

A suction excavator includes a suction hose with a suction opening for pneumatically receiving solid or liquid suction material using a fast-flowing air stream. The suction excavator has a separator for separating the suction material from the air stream, a filter unit for cleaning the air stream, a fan unit for generating the air stream, and a recirculation channel that is connected to the pressure side of the fan unit via a volume-controllable recirculation opening. A volume-controllable secondary air opening allows secondary air from the surroundings to be supplied to the suction side of the fan unit, downstream from the filter unit in the flow direction. The recirculation channel is fluidically coupleable to the suction hose to generate a positive pressure in the recirculation channel to blow out recirculation air through the suction hose.

An overflow system for a hopper dredger includes an overflow tube; and a plurality of canals adjacent and substantially parallel to the overflow tube. The plurality of canals have inlets at different heights for taking in head water from the hopper. The plurality of canals fluidly connect to the overflow tube at a point downstream from the inlets.

A method and apparatus for generating a slurry from the surface of the subsea floor, separating that slurry into multiple slurries, and pumping the desired slurry to the surface.

A method and apparatus for generating a slurry from the surface of the subsea floor, separating that slurry into multiple slurries, and pumping the desired slurry to the surface.

Hydro excavation vacuum apparatus that process spoil material onboard the apparatus by separating water from the cut earthen material are disclosed.