Abstract: An externally mounted tank nozzle assembly which can be used in many mixing systems. The assembly can be installed as a fixed nozzle or as an externally adjustable nozzle. The disclosed nozzle is light-weight, corrosion-resistant as well as abrasion-resistant to withstand many tank mixing environments and conditions.

Abstract: A surface foam diffuser and digester tank system prevents and/or suppresses the formation of foam during digestion. The system includes a first nozzle disposed above a top surface of the at least partially liquid contents, a splash plate positioned adjacent to the first nozzle outlet, and a second nozzle disposed below the top surface of the at least partially liquid contents for suppressing foaming in the large processing tanks. The system nozzles each have an inlet for receiving pressurized liquid and an outlet for ejecting a liquid stream into the tank, the depth of the second nozzle and the direction of the liquid stream there from being such that rotation of the top surface is facilitated. The spray of the first nozzle, as dispersed by the splash plate, reduces foam on at least a portion of the top surface, with the rotation of the top surface bringing each portion of the top surface to eventually fall within the reducing spray.

Abstract: A surface foam diffuser system having a first nozzle disposed above a top surface of the at least partially liquid contents, a splash plate positioned adjacent to the first nozzle outlet, and a second nozzle disposed below the top surface of the at least partially liquid contents is disclosed for suppressing foaming in large processing tanks. The system nozzles each have an inlet for receiving pressurized liquid and an outlet for ejecting a liquid stream into the tank, the depth of the second nozzle and the direction of the liquid stream there from being such that rotation of the top surface is facilitated. The spray of the first nozzle, as dispersed by the splash plate, reduces foam on at least a portion of the top surface, with the rotation of the top surface allowing each portion of the top surface to eventually fall within the reducing spray.

Abstract: An oil leak prevention device for use on a pump assembly having a non-contacting bearing isolator. The device has an annular surface having a central opening and a second surface extending from the first surface. The second surface covers an opening of an outside leak path between the rotor and the stator of the bearing isolator when the central opening is placed about the shaft of the pump. A method for preventing the leakage of oil from the pump assembly includes forming an oil containment cup and then placing the oil containment cup in contact with the bearing isolator such that a shaft of the pump assembly passes through the central opening and the second surface of the oil containment cup covers the opening of the leak path. Preferably, the cup is removed from the pump before operation of the pump.

Abstract: A chopper pump with scissoring back cutters and having a housing with an intake opening and an outlet opening, both in fluid communication with an internal chamber, and an impeller assembly positioned within the chamber, is disclosed. Generally speaking, the impeller assembly comprises an impeller attached to a rotatable pump shaft and includes a back shroud. An insert cutter positioned on a surface of the shroud opposite the impeller includes a cutting edge configured for shearing operation, while a stationary back plate having a surface adjacent to and facing the back shroud includes a cutting rib having a cutting edge configured for shearing operation. The insert cutter and cutting rib work jointly to create a cutting action as the impeller in the chamber.

Abstract: A screw-type centrifugal pump with scissoring back cutters and having a housing with an intake opening and an outlet opening, both in fluid communication with an internal chamber, and an impeller assembly positioned within the chamber, is disclosed. Generally speaking, the impeller assembly has a hub having a back shroud and being attached to a rotatable pump shaft, with an impeller attached to the hub. An insert cutter positioned on a surface of the hub shroud opposite the impeller includes a cutting edge configured for shearing operation, while a stationary back plate having a surface adjacent to and facing the hub shroud includes a cutting rib having a cutting edge configured for shearing operation. The insert cutter and cutting rib work jointly to create a cutting action as the hub rotates in the chamber.

Abstract: A mixing system for a fluid tank is described, the system having a drive motor, an impeller, a shroud enclosing the impeller and a cutter mounted on the shroud to cut solids. The shroud is open at inlet and discharge ends for drawing in and discharging fluid from the tank. A recess is provided on the internal surface of the shroud, wherein the cutter is adjustably positioned within the recess. The cutter is detachable from the recess to allow replacement. In use, homogeneity is maintained in a slurry contained within the tank by submerging the impeller such that the cutter cooperates with the impeller to cut solids within the slurry, drawing tank contents into the impeller at the inlet, cutting material between the cutter and blade, and then discharging the material.

Abstract: A chopper pump with scissoring back cutters and having a housing with an intake opening and an outlet opening, both in fluid communication with an internal chamber, and an impeller assembly positioned within the chamber, is disclosed. Generally speaking, the impeller assembly comprises an impeller attached to a rotatable pump shaft and includes a back shroud. An insert cutter positioned on a surface of the shroud opposite the impeller includes a cutting edge configured for shearing operation, while a stationary back plate having a surface adjacent to and facing the back shroud includes a cutting rib having a cutting edge configured for shearing operation. The insert cutter and cutting rib work jointly to create a cutting action as the impeller in the chamber.

Abstract: A screw-type centrifugal pump with scissoring back cutters and having a housing with an intake opening and an outlet opening, both in fluid communication with an internal chamber, and an impeller assembly positioned within the chamber, is disclosed. Generally speaking, the impeller assembly has a hub having a back shroud and being attached to a rotatable pump shaft, with an impeller attached to the hub. An insert cutter positioned on a surface of the hub shroud opposite the impeller includes a cutting edge configured for shearing operation, while a stationary back plate having a surface adjacent to and facing the hub shroud includes a cutting rib having a cutting edge configured for shearing operation. The insert cutter and cutting rib work jointly to create a cutting action as the hub rotates in the chamber.

Abstract: A mixing system for a fluid tank is described, the system having a drive motor, an impeller, a shroud enclosing the impeller and a cutter mounted on the shroud to cut solids. The shroud is open at inlet and discharge ends for drawing in and discharging fluid from the tank. A recess is provided on the internal surface of the shroud, wherein the cutter is adjustably positioned within the recess. The cutter is detachable from the recess to allow replacement. In use, homogeneity is maintained in a slurry contained within the tank by submerging the impeller such that the cutter cooperates with the impeller to cut solids within the slurry, drawing tank contents into the impeller at the inlet, cutting material between the cutter and blade, and then discharging the material.

Abstract: A mixing system for a fluid tank is described herein, the system having a drive motor, an impeller capable of being submersed, a shroud having a sidewall enclosing the impeller, and a cutter mounted on the shroud and cooperating with a blade of the impeller to cut solids within the shroud. The shroud is open at both an inlet end and a discharge end for drawing in and discharging fluid from the tank. A recess is provided on the internal surface of the shroud, wherein the cutter is adjustably positioned within the recess. Additionally, the cutter is also detachable from the recess so that it may be replaced when worn.

Abstract: A mixing system for a fluid tank is described herein, the system having a drive motor, an impeller capable of being submersed, a shroud having a sidewall enclosing the impeller, and a cutter mounted on the shroud and cooperating with a blade of the impeller to cut solids within the shroud. The shroud is open at both an inlet end and a discharge end for drawing in and discharging fluid from the tank. A recess is provided on the internal surface of the shroud, wherein the cutter is adjustably positioned within the recess. Additionally, the cutter is also detachable from the recess so that it may be replaced when worn.

Abstract: A surface foam diffuser system having a first nozzle disposed above a top surface of the at least partially liquid contents, a splash plate positioned adjacent to the first nozzle outlet, and a second nozzle disposed below the top surface of the at least partially liquid contents is disclosed for suppressing foaming in large processing tanks. The system nozzles each have an inlet for receiving pressurized liquid and an outlet for ejecting a liquid stream into the tank, the depth of the second nozzle and the direction of the liquid stream there from being such that rotation of the top surface is facilitated. The spray of the first nozzle, as dispersed by the splash plate, reduces foam on at least a portion of the top surface, with the rotation of the top surface allowing each portion of the top surface to eventually fall within the reducing spray.

Abstract: A nozzle ejects a liquid stream generally horizontally inward from a location near the periphery of a tank, and fairly close to the upper surface of liquid in the tank. The liquid stream impinges on a splash plate or deflector to break the liquid stream into a reasonably uniform dispersion of droplets over a substantial area of the surface of the liquid in the tank, which reduces the surface foam.

Abstract: An improved mechanism is provided for adjusting the clearance between the outer edges of impeller vanes of a centrifugal pump and the interior surface of an adjacent intake plate. The impeller having the vanes is mounted as an assembly to a back plate that can be secured to a casing or housing to which the intake plate is mounted. Threaded adjusters allow adjustment of the clearance between the impeller vanes and the intake plate. Additional modifications include a modified seal design to prevent material from clogging relatively rotatable seal components, a modified intake plate with a shallow recess to increase chopping effectiveness and pump efficiency, impeller vanes with a unique shape to achieve a high head, and a self-priming pump.

Abstract: An improved mechanism is provided for adjusting the clearance between the outer edges of impeller vanes of a centrifugal pump and the interior surface of an adjacent intake plate. The impeller having the vanes is mounted as an assembly to a back plate that can be secured to a casing or housing to which the intake plate is mounted. Threaded adjusters allow adjustment of the clearance between the impeller vanes and the intake plate. Additional modifications include a modified seal design to prevent material from clogging relatively rotatable seal components, a modified intake plate with a shallow recess to increase chopping effectiveness and pump efficiency, impeller vanes with a unique shape to achieve a high head, and a self-priming pump.