Abstract: A pump (1) for pumping highly viscous fluids is presented that includes a casing (3), an inlet (7), an outlet (8) and a closed impeller (5) rotatably arranged in the casing between the inlet and the outlet and that has a side room (6) between a shroud (4) of the impeller and the casing (3). In addition, the pump (1) includes a sealing element (7a, 7b, 8a, 8b) between the impeller (5) and the casing (3) each at an inlet side and at an outlet side of the impeller for restricting back flow through the side room (6) and for allowing the fluid contained in the side room to heat up, and an injection port (9) leading into the side room (6) for injecting a fluid into the side room for diminishing disk friction between the shroud (4) of the impeller and the casing (3).

Abstract: A pump system (1) is provided for the pumping of multiphase mixtures which includes a pumping apparatus (3) for multiphase mixtures with at least one liquid phase and at least one gaseous phase. The pumping apparatus (3) contains one or more axial compression stages with one respective axial impeller each and one or more pumping stages with a respective one radial impeller each which are arranged adjoining the axial compression stage or stages, wherein the pump system (1) additionally includes a separator (2) at the inlet side of the pumping apparatus (3) to separate a portion of the gaseous phase and wherein the pumping apparatus (3) is configured for delivery heads larger than 50 m.

Abstract: A rotary wheel for radial pumps includes an intermediate wall at which one or more vanes are provided on both sides. Passage openings are formed in the intermediate wall in order to distribute a desired pump flow onto the vanes on both sides of the intermediate wall.

Abstract: A pump system (1) is provided for the pumping of multiphase mixtures which includes a pumping apparatus (3) for multiphase mixtures with at least one liquid phase and at least one gaseous phase. The pumping apparatus (3) contains one or more axial compression stages with one respective axial impeller each and one or more pumping stages with a respective one radial impeller each which are arranged adjoining the axial compression stage or stages, wherein the pump system (1) additionally includes a separator (2) at the inlet side of the pumping apparatus (3) to separate a portion of the gaseous phase and wherein the pumping apparatus (3) is configured for delivery heads larger than 50 m.

Abstract: An arrangement (10) for the determination of the mass flow and of the gas/liquid ratio in a multiphase mixture during conveying includes—in the conveying direction (9)—a first venturi nozzle (5.1), a pump (1) and, after the pump, a second venturi nozzle (5.2).

Abstract: A rotary wheel (1) for radial pumps includes an intermediate wall (6) at which one or more vanes (2a, 2b) are provided on both sides. Passage openings (3) are formed in the intermediate wall (6) in order to distribute a desired pump flow onto the vanes (2a, 2b) on both sides of the intermediate wall.

Abstract: The container serves for mixing and measuring multi-phase fluids which are conducted in via a supply tube. The liquid and gaseous components are separated in the container and collected into a liquid volume as well as a gas volume. A liquid surface forms at the separating layer between the gas volume and the liquid volume, the actual height of which is measured by a sensor. The fluids located in the container are drawn back off out of the container in the direction of flow in a flowing manner via a removal apparatus which comprises at least one removal apparatus as well as a drainage means adjoining it and are thereupon mixed. The drainage means is arranged vertical to the liquid surface and has openings which lie partly below and partly above the liquid surface during normal operation of the container. The drainage means has a Venturi nozzle in the region of the inlet opening in order to measure the flow rate of the gaseous component which flows through the inlet opening into the drainage means.

Abstract: A centrifugal pump (10) conveys a fluid from a rotor wheel inlet opening (8) via a rotor wheel outlet opening (9) into a pressure nozzle (4). The fluid has a velocity profile between the outer flow line (c) and the inner flow line (d). The method allows a fluid to be conveyed with a centrifugal pump (10) in such a manner that the velocity profile is continuously changed in dependence on the delivery flow (Q) which means that an abrupt change of the velocity profile when transferring from one load condition, e.g. at maximum efficiency, to another load condition, e.g. a partially loaded region, is avoided which results in a stable H/Q)-characteristic.

Abstract: The sleeve of the axial-thrust equalizer is provided with radial bores which deliver working liquid to the annular gap between the sleeve and dummy piston without pre-rotation. The delivered liquid divides within the annular gap so that a sub-flow of liquid is returned to the contiguous pump chamber to prevent pre-rotating liquid from entering directly into the gap from the pump chamber.