Patent ID: 7025492

Claim:
In a tank having a floor, a center, and a peripheral wall, the tank containing a quantity of nonhomogeneous material including a liquid having a median depth in the tank, and apparatus for mixing the nonhomogeneous material, the improvement comprising the mixing apparatus including a plurality of first jet nozzles for inducing flow of liquid within the tank, the first nozzles being located a substantial distance outward from the center of the tank and a substantial distance inward from the peripheral wall of the tank, the first nozzles being equidistant from the center of the tank, and a plurality of second jet nozzles for inducing flow of liquid within the tank, the second nozzles being located a substantial distance outward from the center of the tank and a substantial distance inward from the peripheral wall of the tank, the second nozzles being equidistant from the center of the tank, each of the first nozzles inducing flow of liquid in a first direction circumferentially of the tank, each of the second nozzles inducing flow of the liquid in the first direction circumferentially of the tank, the first nozzles being directed at least partly inward relative to a tangent to a circle centered about the center of the tank which circle intersects the locations of the first nozzles and the first nozzles being directed inward relative to the second nozzles, each first nozzle being approximately aligned vertically in the tank with one of the second nozzles, each first nozzle being adjacent to the floor, and each second nozzle being raised above the floor at an elevation higher than the first nozzles.