Abstract: A high-speed fluid blender for liquid fertilizer employs a slurry-type of pump for both mixing and recirculation. The pump has a plurality of parallel spaced-apart blades, each of which comprises a disc having a central circular opening formed therein. One of the discs, such as the top disc, is driven by a shaft powered by a motor. The remaining discs are carried by the driven disc for rotation in unison. The discs are substantially alined coaxially of one another, and the disc assembly is housed within an annular pump housing. The circumferential edges of the discs have a substantial radial clearance with respect to the annular wall of the pump housing. This radial clearance increases in the direction of rotation of the blade assembly towards the discharge opening in the pump housing. A funnel-shaped hollow neck housing is secured to the bottom wall of the pump housing, in communication with the inlet opening therein, and diverges outwardly therefrom.

Abstract: A device for maintaining a substantially uniform proportion between two or more liquids comprising a substantially cylindrically shaped tank and a liquid exit tube located at the bottom and approximately at the radial center of the tank. The liquid exit tube is characterized as possessing a flared top end and one or more openings at its bottom end. Means are also included within the cylindrically shaped tank for injecting two or more liquids into the tank which is connected to a pump or other means for maintaining circulation of the liquids.

Abstract: Particulate materials are blended in a vessel provided with a plurality of vertically extending conduits therein. The vessel comprises a downwardly converging frustoconically shaped bottom wall which defines the lower region of the vessel. The conduits are provided with a plurality of longitudinally extending compartments having openings within the upper region of the vessel. The lower ends of the conduits and the compartments therein extend through the bottom wall, each communicating via a corresponding connecting conduit with a solids outlet at the open bottom of the bottom wall. At least one drain conduit communicates between a corresponding opening in the bottom wall and a corresponding compartment at a location below the bottom wall. A baffle is disposed within the vessel separating the upper and lower regions and comprises a downwardly converging inverted generally conical portion spaced above the bottom wall and defining therebetween a downwardly converging annular passage.

Abstract: A mixing head for two reactive components, e.g. the components of a settable synthetic resin mixture, comprises a mixing chamber in which a plunger is shiftable to block and unblock the nozzle orifices and drive the reaction mixture from the chamber through an outlet. At least one of the nozzles is carried on a readily shifting slider which cooperates with a similarly shiftable obturating member to define a small premixing chamber, as desired, and deflect the mixture through at least 90.degree. within the mixing chamber. This system is especially effective for the mixing of reactive components which have hitherto been found to be difficult to mix with conventional mixing heads.

Abstract: A mixing head for two or more reactive components especially anionically polymerizing caprolactam comprises a piston formed with recess means which, at the end turn toward the outlet of the mixing chamber, intercept respective streams of the components which are normally trained upon one another and thus prevent mixing just before the piston blocks the ports through which these streams are directed into the mixing chamber.

Abstract: A process and apparatus are provided for continuously sampling, for example, crude oil, to determine the amount of water and bottom sediments in the crude oil, wherein the crude oil is passed through a mixing zone in a pipeline to homogenize the crude oil, a fluid stream is continuously withdrawn from the homogenized crude oil and introduced into a collecting vessel. The collected fluid is mixed for homogenization, whereafter a sample is taken from the fluid for analysis.

Abstract: A fluid agitating apparatus is disposed in a vessel containing a body of fluid to be agitated. The fluid agitating apparatus includes a housing having an inlet at an open lower end thereof, and an outlet at an open upper end thereof, with a flow passage disposed through the housing communicating the inlet and the outlet. The flow passage is preferably circular in cross-section and has a minimum diameter at a throat thereof. The diameter of the flow passage increases continuously from the throat toward both the inlet and the outlet. A vertically upward directed nozzle is located in the flow passage below the throat for inducing flow of fluid from the body of fluid in which the housing is submerged into the inlet and upward through the flow passage. A tangentially directed nozzle is disposed in the flow passage above the throat for inducing a swirling flow in the fluid flowing upward through the flow passage.

Abstract: A method and apparatus for mixing fine material in which material is extracted from a level located above the cover of a discharge chamber at the base of a mixing silo and returned to the upper part of the silo. Fresh material is delivered to the upper part of the silo, and in a region that is radially inward of that in which the extracted material is returned.

Abstract: A method and apparatus for the continuous processing of polymers and, more particularly, a method and apparatus for the continuous dilution of solutions of long-chain polymers by successive or multiple recycling without degrading of the polymers.

Abstract: Particulate materials are blended in a vessel provided with a plurality of vertically extending conduits therein. The vessel comprises a downwardly converging frustoconically shaped bottom wall which defines the lower region of the vessel. The conduits are provided with opening within the upper region of the vessel and the lower ends of the conduits extend through the bottom wall, each commmunicating via a corresponding inclined conduit with a solids outlet at the open bottom of the bottom wall. At least one drain conduit communicates between a corresponding opening in the bottom wall and a corresponding inclined conduit. A baffle is disposed within the vessel separating the upper and lower regions and comprises a downwardly converging inverted generally conical portion spaced above the bottom wall and defining therebetween a downwardly converging annular passage.

Abstract: An apparatus and method for withdrawing fluid such as oil from an oil pipeline comprising 2 collection apparatus, an alternate one of which is at all times connected to the pipeline connecting oil, whereby while one is collecting oil, the oil in the other collection apparatus is being mixed and then is emptied ready to receive oil.

Abstract: The method of mixing solid and liquid substances comprises the steps of keeping the substances in a constant circulation through a mixing tank by pumping the substances through a tank outlet and feeding them back through a tank inlet, discharging ready mixture from the tank, and supplying simultaneously a quantity of substances to the tank that equals the quantity of the ready mixture discharged from the tank. The apparatus for performing the method comprises a loop-type reactor with a reactor housing having inlet means at one end and outlet means at the opposite end, and having a tube socket for introducing the substances into the reactor. A control valve regulates the quantity of substances admitted to the reactor. The inlet means and the outlet means are interconnected by a pipe line, including a circulating pump. The pump keeps the substances in a constant flow through the reactor and the pipe line. A discharge valve is connected to the pipe line for discharging part of the ready mixture.

Abstract: A container having a center suction conduit with a plurality of inductors, a plurality of injectors for injecting fluid into the container and a pump for withdrawing fluid from the container by way of the inductors and center suction conduit and recirculating the fluid by way of the injectors. The pump has an inlet coupled to an outlet end of the center suction conduit and an outlet coupled to the injectors. Each inductor comprises a conduit which extends into the center suction conduit and which has an opening within the center suction conduit which faces the outlet end thereof. A lower suction conduit is coupled to the bottom of the container and to the inlet of the pump. A reverse flow conduit is coupled to the outlet of the pump and to the outlet end of the center suction conduit for allowing the pump to pump fluid from the container by way of the lower suction conduit and into the center suction conduit for cleaning out the inductors.

Abstract: An apparatus for continuously emulsifying an oil-water mixture supplied to a burner, having a first flow circuit when the burner is operative and a second flow circuit when the burner is inoperative.

Abstract: An apparatus for mixing an additive with molten paving material and for application of the resultant paving composition. The apparatus includes a mixing mechanism in heat transfer relationship with a heated materials tank for recirculatingly moving molten asphalt from the materials tank through the mixing mechanism and back to the materials tank with the additive being added and mixed with the recirculating molten paving material for production of the resulting paving composition which is subsequently supplied from the heated materials tank to an applicator device of the apparatus.

Abstract: Oil sludge (15) formed within a storage container (10) is removed by penetrating tubular lances (20) into the sludge body (15) and then pumping dispersant chemicals borne by a water jet through the lances (20) into the sludge body (15) with continuous drawing off and recirculation of emulsified fractions under pressure. The sludge body (15) breaks down both physically and chemically to form a pumpable fluid which is drained and mixed with a larger volume of liquid oil to allow dispersion of the hydrocarbonaceous content of the emulsified fluid as a suspension in the oil volume allowing the water to settle out of the mixture, the settled water layer being thereafter drawn off. This oil mixture is then processed in the process plant. The dispersant chemicals emulsify or form coloidal suspension or solution of the hydrocarbonaceous content of the sludge body (15) in water.

Abstract: The present invention is a universal blending system and method for blending the material contents of a silo having a predetermined interior cross-sectional area by layer blending or across vertical columns, column blending, or a combination of layer and column blending.The presently preferred method of the present invention employs either vertical displacement of a partial vertical column of the silo content to provide a representative mixture in every horizontal cross-section in order to reduce the number of necessary recycles to a minimum or substantially simultaneous multilevel displacement, with subsequent uniform discharge over the whole horizontal cross-section of the silo to remix material that may have been segregated during the filling or recycling.

Abstract: A system is provided for dispensing curable compositions formed by a mixture of first and second materials which, when mixed in prescribed ratio, interact with each other to provide a relatively rapidly curable composition, such as a polymerizable epoxy resin or the like. The materials are individually pumped and metered through a first mixer and a dispensing valve to a dispensing nozzle. During start-up, the dispensing nozzle is closed, and the initial mixed composition is diverted through a bypass valve for dilution and mixture with a diluent stream of the first material in a second mixer and for return of the diluted mixture to the supply reservoir of the first material. When a homogeneous mixture of prescribed ratio is achieved at the outlet of the first mixer, the bypass valve is closed and the dispensing valve can be opened to allow dispensing of the composition.

Abstract: Progammable computer controlled reaction injection mixing of selectively variable reactive fluid polymerizable components is disclosed, embodying an improved reactive injection mixing head construction which facilitates rapid changes in mix formulations between successive pour or molding operations in a continuing succession of such operations, while maintaining consistently uniform results in the finished products.

Abstract: The invention relates to a method and a device for producing a reaction mixture from flowable foam-forming or solid-forming components (preferably polyurethane forming components) which are conveyed continuously and are mixed together or are circulated. The quantity to be conveyed is preselected. The injection pressure is preselected and the circulatory pressure is measured for each component. The predetermined quantity and pressure to be conveyed as well as the measured value are preferably fed into a control computer during the circulation and the mixing process and are compared with actual values. Cavities are filled out with the reaction mixture produced and, in particular, molded articles are produced in molds.

Abstract: A novel dual or more interconnected pumping mechanisms pump is provided herein. It comprises a first pumping mechanism within a casing. A first pumping mechanism is provided within the casing, the first pumping mechanism having an operating shaft within the casing, the operating shaft being operated by a motor. The first pumping mechanism has pumping structure so constructed and arranged as exclusively to provide a high pressure, low volume aqueous liquid flow, the first pumping mechanism having axial output. A second pumping mechanism is also provided within the casing, and is in direct liquid flow connection with the first pumping mechanism, the second pumping mechanism also having an operating shaft within the casing, the operating shaft being operated by the same motor. The second pumping mechanism has pumping structure so constructed and arranged as exclusively to provide a low pressure, high volume aqueous liquid flow.

Abstract: Hydraulically coupled injection nozzles (5,28) and return nozzles (15,38) are used in an apparatus for producing a reaction mixture of fluid components forming foam or a solid material. These nozzles (5,15,28,38) comprise control pins (11,20,34,43) which are designed to be inserted into the openings (6,17,29,40) of the nozzles (5,15,28,38). The ratio between the distances which the control pins (11,20,34,43) travel outside and inside the orifices (6,17,29,40) is adjusted in such a way that, when the nozzles (5,15,28,38) are switched from "mixing" to "circulation" or vice versa, there is a time interval during which all the nozzles (5,15,28,38) are closed.

Abstract: A mixing head for mutually reactive components, e.g. of a synthetic resin to be injected into a mold cavity, comprisess a control member which is shiftable in a mixing chamber opening into the mold cavity between a position in which mixing of the components can occur in this chamber and a position in which the member expels the mixture from the chamber and provides recirculating passages for the two components. A displacement body can be inserted into the chamber to control the mixing action by a fluid-operated actuator hydraulically coupled to a fluid displacement member shifted by the control member.

Abstract: The invention relates to a method and a device for producing a solid-forming or foam-forming flowable reaction mixture by metered injection of flowable reaction components into a mixing zone from which the finished reaction mixture is discharged.

Abstract: This mixer comprises a cylindrical tank 5 having a fixed lateral wall 7 and a rotary bottom 9 rotatably mounted inside the lower part of the fixed lateral wall. It is characterized in that the rotary bottom 9 comprises a peripheral collar 18 overhanging its lateral face and forming an annular gap with wall 7, in that an annular projection 21 carried by this latter extends under the collar and defines therewith an annular chamber 22 extending between the lateral face of bottom 9 and wall 7, and in that the chamber communicates with the tank through the annular gap and emerges under the bottom 9 into a narrow annular slit provided between the lateral face of the bottom and the projection 21.

Abstract: A slurry storage tank comprises a central vertical column arranged therein. A drive mechanism is mounted on the upper portion of the column. A plurality of rake arms with rake elements are arranged within the tank adjacent to its bottom. The rake arms are slowly rotated about the column by the drive mechanism to direct the lower portion of the slurry toward the side wall of the tank. The slurry is withdrawn from the lower portion of the tank by a pumping means and delivered through a pipe means to a plurality of vertical guide pipes supported by the top wall of the tank and extending into the tank. The withdrawn slurry is distributed over the entire surface of the slurry in the tank through the guide pipes to thereby maintain the slurry in the tank in a homogeneous state.

Abstract: A body of liquid, such as an aqueous fertilizer mixture, in a tank is stirred and mixed by apparatus which produces a pattern of recirculating flow including a zone of rapid streamline flow in the tank, preferably an upwardly diverging conical pattern and preferably at an eccentric point in the tank. An addition component in fluid state, such as anhydrous liquid ammonia, is injected into the rapidly flowing liquid in a plurality of fine streams from a stationary injection manifold so as to produce an intimate dispersion of finely divided addition fluid at spaced points in the mixture which is immediately carried away from the injection area and widely dispersed in the liquid mixture. When anhydrous ammonia is thus dispersed in a fertilizer mixture containing a suitable reactant, such as phosphoric acid (H.sub.3 PO.sub.

Abstract: A process and apparatus are provided for making desired shapes of urea-formaldehyde suitable for use as insulation from urea-formaldehyde foam. Fluid urea-formaldehyde foam (A) is formed into discrete particles (A') in particle generator (10) which also partially cures particles (A'). After particles (A') are fully cured, they are blended with fluid urea-formaldehyde foam in mixing apparatus (11) which includes blending head (66) to produce mixture (C) which is a coherent mass. Mixture (C) is molded to the desired cross-sectional shape by molding conveyor (12). Cutter (132) cuts formed mixture (C) into the desired length. Thereafter oven (146) is utilized for fully curing the product which is then enclosed in a suitable packaging material.

Abstract: A counter current extractor in which material to be extracted is caused to move in counter current with an extracting liquid by a screw conveyor characterized in that the direction of rotation of the screw conveyor is intermittently reversed. A process for extracting soluble and dispersible materials using such a counter current extractor is also disclosed.

Abstract: The insertion of exposed film into a developing tank 1 is detected by a detector 12, by which a pump motor 8 is operated by a control circuit 20, to agitating continuously the developing solution filled in the tank, and simultaneously a pulse counter 16 stars counting pulses generated from a pulse generator 14. The continuous agitation of the developing solution is suspended when the film is discharged from the tank, which is measured by counting up to the predetermined number which corresponds to the time required for the film treatment in the tank. When the pulse counter 16 counts up to the predetermined number, the intermittent agitation of the developing solution is started by the control circuit 20, to keep the developing solution uniform.

Abstract: A gas trap used to separate at least a portion of the gases entrained in drilling fluids used in an oil well drilling operation which is associated with the shale shaker box and an analyzer such as a hot wire analyzer. The gas trap includes a receptacle or can vertically adjustably supported from the shaker box by a supporting assembly with the can including a top supporting the can by a unique connecting assembly enabling rotational adjustment of the can about a vertical axis to orient the inlet and outlet from the can in a desired location in relation to the shaker box. The top is provided with a standpipe and a motor shaft extends through the top and is provided with plastic fingers radiating from the lower end thereof for agitating the drilling fluid to assist in gas removal.

Abstract: Mixing apparatus is described in which a plurality of chemical materials are to be incorporated in a carrier liquid, which may be a solvent, such as water, and which is quantitatively predominant, some of the chemical materials being incompatible if brought together directly, or in a wrong sequence, or which are difficult to combine, the materials being combined in the desired proportions in a cascaded arrangement of liquid filled chambers, the respective materials in the desired proportions preferably being supplied from separate sources of materials by pumps, the delivery of the carrier liquid being to a first mixing chamber to which a first chemical material is supplied, the contents of the first mixing chamber being delivered to a second mixing chamber to which another material is supplied, with provisions to prevent back flow, the fluid from the second mixing chamber being delivered to a third mixing chamber to which another chemical material may be added, with additional mixing chambers and pumps as des

Abstract: A mixing apparatus is provided in which a rotatable impeller is surrounded by a device having radial openings and being in shearing relationship with the impeller so that material urged outwardly through the openings is subjected to a shearing action. A discharge chamber receives material passing through the openings and is thus pressurized so as to discharge material from an outlet of the chamber.

Abstract: The present invention is a universal blending method for blending the material contents of a silo having a predetermined interior cross-sectional area by layer blending or across vertical columns, column blending, or a combination of layer and column blending.The presently preferred method of the present invention employs either vertical displacement of a partial vertical column of the silo content to provide a representative mixture in every horizontal cross-section in order to reduce the number of necessary recycles to a minimum or substantially simultaneous multilevel displacement, with subsequent uniform discharge over the whole horizontal cross-section of the silo to remix material that may have been segregated during the filling or recycling.

Abstract: A method and apparatus for producing fluidized lime is disclosed herein. The apparatus includes a storage tank for holding and storing a fluid medium. Lime particulate is mixed by an inductor unit with the fluid medium in a closed conduit to thereby eliminate the problem of air pollution. The apparatus also includes a suitable valve and conduit system for delivering the fluid medium to the inductor unit, for returning the mixture of lime particulate and fluid medium from the inductor unit to the storage tank, and for circulating the fluid medium and mixture in a manner to achieve thorough mixing.

Abstract: In an apparatus, such as a liquid-gas condensation tower, in which a liquid phase is withdrawn rapidly through an exit port from a chamber, an improvement which assures complete agitation throughout the liquid phase comprises a regular array of liquid agitation devices positioned within the liquid and above a cone-shaped vortex breaker structure which is placed above the exit port.

Abstract: A manure agitation system directed to an open top tank for storage of manure slurry. A gate valve is located in the floor of the tank which can be opened from outside the tank to draw manure slurry from the inside of the tank through a piping system and pump assembly and flow it under pressure through the piping system to an agitator nozzle for substantially high pressure discharge and located inside the tank generally centrally of the floor of the tank and which can be rotated to different positions from outside the tank. A pair of first and second flow control valves are opened to permit the flow of the manure slurry as described and a third control valve is then in closed position.

Abstract: Mixing apparatus is described in which a plurality of chemical materials are to be incorporated in a carrier liquid, which may be a solvent, such as water, and which is quantitatively predominant, some of the chemical materials being incompatible if brought together directly, or in a wrong sequence, or which are difficult to combine, the materials being combined in the desired proportions in a cascaded arrangement of liquid filled chambers, the respective materials in the desired proportions preferably being supplied from separate sources of materials by pumps, the delivery of the carrier liquid being to a first mixing chamber to which a first chemical material is supplied, the contents of the first mixing chamber being delivered to a second mixing chamber to which another material is supplied, the fluid from the second mixing chamber being delivered to a third mixing chamber to which another chemical material may be added, with additional mixing chambers and pumps as desired to accommodate additional chemica

Abstract: Apparatus and method for producing a slurry. The apparatus includes a slurry reservoir, a closed circuit and a pump for circulating slurry from the reservoir through the closed circuit and back to the reservoir. Means are provided for introducing both particulate and liquid materials into the closed circuit for forming the slurry. A first control circuit provides a particulate flow rate signal indicating the rate of flow of particulate material into the closed circuit. A flow meter provides a liquid flow rate signal indicative of the actual flow rate of liquid material into the closed circuit. A density measuring and control circuit measures the density of slurry flowing within the closed circuit and provides a density signal indicative of the difference between the measured density of slurry and a desired desity based upon data inputted to the density measuring and control circuit.

Abstract: Kaolin suspension homogenizing and storage tank provided with at least a single mixing device mounted on its side wall. The mixing device includes a propeller or paddle impeller with inclined blades, the diameter of which is 1/15 to 1/30 of the diameter of the tank and the velocity of the blade tips of the impeller range from 6 to 12 m/s. The arrangement includes an alternative circulation pump and at least a single jet.

Abstract: A multiple automatic metering device particularly suitable for metering and admixing paints and able to meter exact quantities of various base colors so as to be able to obtain an extremely wide range of shades. The device comprises a series of units consisting of a container for the color and of a metering head connected therewith. The device can be programmed to assure the duplication of the metering operation and to insure uniformity of the color of various batches of final product.

Abstract: Milling apparatus wherein material to be milled is agitated with a charge of particulate material also includes one or more predispersing chambers through which the material to be milled enters the apparatus. The chamber includes pumping means which carry out predispersing work.

Abstract: Apparatus for blending bulk particulate solids comprises a distribution chute bin, a cone section having outer and inner cones, and a flow pattern controller outlet device. The solids may be recirculated from the outlet device to the chute bin for additional blending. The chute bin prevents particle size segregation by causing mixing of coarse and fine particles. The inner cone permits mass flow adjacent the outer cone, and also enforces the flow velocity profile imposed at the bottom of the cones to continue to the top of the inner cone. The flow pattern controller is operable to shift between a blending mode resulting from the difference in the velocity profiles within and around the inner cone and a uniform flow mode useful when emptying the apparatus.

Abstract: Gravity flow blending system for granular materials by use of novel internal handling means which provides for a continuous, uniform withdrawal of material from a multitude of locations in a large capacity bin. The invention utilizes basic principles of solids rheology to provide for a natural internal self-regulation which makes it possible to use this system for a wide range of material discharge rates and granular material types.

Abstract: A generally cylindrical mixing tank for oil well drilling mud circulates the mud passing out of a set of urethane nozzles about an elliptical path in the tank, which is coated internally with urethane thereby to provide a long lasting mixer in the presence of the abrasive drilling mud.New ingredients are entered into the tank directly from bags as they are passed over a cutter knife and across an entry grillwork platform. Water may be added for proper viscosity.The nozzles, by aid of a circulating pump taking mud from the tank, cause the mud to flow in a generally rotary path inside the tank and a set of knives is placed in this path to slice up any lumps or chunks of mud that may form.

Abstract: A processing device comprises a base member with inner and outer concentric tubular shafts extending vertically upwards therefrom. There is means for rotating the shafts in opposite directions. A container mounted on the base is connectable to the outer shaft for rotation therewith. An impeller within the container is connected to the inner shaft for rotation therewith. There is a valve for controlling the flow of material through an aperture of the impeller member and an aperture of the inner shaft and downwardly through the inner shaft. A dispensing device comprises a distributing head with a fitting for connecting the device to a hose for supplying a paste-like substance under pressure, a spreading edge and a plurality of conduits extending from the fitting, through the distributing head and opening outwardly adjacent the spreading edge.

Abstract: A device for homogenization and thermal treatment of liquids, and particularly of liquid mixtures for the ice cream industry, comprising a container, a centrifugal pump communicating with the bottom of said container so as to continuously suck the liquid from said container and to pump it back into said container, and heating and cooling means in said pump in heat exchange relationship with the liquid flowing through said pump.

Abstract: A system for mixing fluids such as drilling fluids and which comprises an elongated container having a cylindrical shaped bottom. A short suction conduit has an inlet in fluid communication with the interior of the container at about its central axis for withdrawing fluid from the container. An exterior conduit extends along the length of the container and has a plurality of spaced apart injection conduits extending into the container for injecting fluid therein in a direction to cause the fluid to swirl around the central axis of the container. A pump has its inlet coupled to the suction conduit and its outlet coupled to one end of the exterior conduit to cause the fluid in the container to spiral inward for flow through the suction conduit and to be pumped into the exterior conduit for injection through the injection conduits back into the container. Means is provided for preventing the fluid from swirling in the suction conduit.

Abstract: A system for mixing fluids such as drilling fluids and which comprises an elongated container having a cylindrical shaped bottom. A suction conduit has an inlet in fluid communication with the interior of the container at about its central axis for withdrawing fluid from the container. An exterior conduit extends along the length of the container and has a plurality of spaced apart injection conduits extending into the container for injecting fluid therein in a direction to cause the fluid to swirl around the central axis of the container. A pump has its inlet coupled to the suction conduit and its outlet coupled to one end of the exterior conduit to cause the fluid in the container to spiral inward for flow through the suction conduit and to be pumped into the exterior conduit for injection through the injection conduits back into the container. An air bleed is provided for removing air from the interior of the container near its axis.

Abstract: A system for mixing fluids such as drilling fluids and which comprises an elongated container having a cylindrical shaped bottom. An interior conduit is located in the container along its axis and has a plurality of spaced apart inductor inlets along its length for the passage of fluid from the container into the conduit. An exterior conduit extends along the length of the container and has a plurality of spaced apart injection conduits extending into the container for injecting fluid therein in a direction to cause the fluid to swirl around the interior conduit. A pump has its inlet coupled to one end of the interior conduit and its outlet coupled to one end of the exterior conduit to cause the fluid in the container to spiral inward for flow through the inductor inlets into the interior conduit and to be pumped into the exterior conduit for injection through the injection conduits back into the container.