Patent ID: 11905677
Assignee: VERMEER MANUFACTURING COMPANY
Field: Chemical engineering (Chemistry)
Classification: CPC E  B  F | IPC B  E  F

Claim 6:
7. A method for hydro excavating a site with the hydro excavation vacuum apparatus as set forth in claim 1, the method comprising:
directing pressurized water from the wand toward an excavation site, the pressurized water cutting earthen material;
removing cut earthen material and water from the excavation site in an airstream and into a separation vessel, the cut earthen material and water separating from the airstream and falling toward an airlock;
rotating the vanes of the airlock at a speed of less than 10 RPM to move cut earthen material and water from an airlock inlet toward an airlock outlet; and
introducing material discharged from the airlock outlet into a dewatering system, the dewatering system separating water from cut earthen material removed from the excavation site.