Radial flow pumps

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The biggest subsection of the centrifugal pumps is the radial pump. The handled liquid is exiting the impeller radially. The achieved delivery head is proportional to the impeller diameter. To realize higher heads, several impellers are put in series (multistage pumps), where guide rings lead the handled medium from radial flow to the axial inlet of  the next stage.  

Radial flow pumps are centrifugal pumps in which the fluid is pumped perpendicularly to the pump shaft.

The flow mechanism in a centrifugal pump can generally be described as follows: Through a suction flange the liquid flows through the suction hub into the rotating impeller due to an energy fall. The pump unit absorbs mechanical energy from a drive motor through a shaft. The blades of the impeller which is permanently fixed on the shaft exert a force on the fluid and increase its angular moment. Pressure and absolute speed increase as a result. Consequently energy is being transferred to the fluid. The energy which is present in kinetic form as an increased absolute speed is usually converted into additional static pressure energy by a diffuser device. Nowadays volute casings or bladed diffusors normally are being used as diffuser devices. In combination with the impeller the diffuser device represents the so-called hydraulic of the pump. To maintain the flow there also has to be an energy fall directly behind the pump after the outlet from the discharge flange, analogous to the pump inlet. Losses occurring in the system for example due to friction or leakage flows require an increased power consumption of the pump.

Centrifugal pumps differ in their constructive and functional characteristics due to their pre-determined installation location and the liquid to be pumped. For pumps of one model range various installation types may be implemented. The hydraulic characteristics and the pumping performance remain nearly unchanged. Main characteristics are the design of the shaft in the horizontal or vertical position, the position of the pump connections and the connection type of the pump to the drive unit using a coupling or direct assembly on the motor shaft (block design).

single-stage radial pump industry 4.0 ready

Range of applications of a radial pump

Radial flow pumps are, for example, used in the following application areas:

  • Boiler Feed Systems
  • Apparatus Construction
  • Filter Systems
  • Air Conditioning Industry
  • Cooling Systems
  • Cooling Lubricant Systems
  • Plastics Industry
  • Dairy Plant
  • Surface Technology
  • Cleaning Systems
  • Recooling
  • Shipbuilding
  • Swimming Pool Technology
  • Tank Systems
  • Refrigeration Systems
  • Irrigation Systems
  • Booster Systems
  • Boiler and Condensate Systems
  • Washing Plants
  • Filter Technology
  • Water Treatment
  • Hardening Systems
  • Process Technology
  • Chemical Industry
  • Tank storage
  • Liquefied gases

Pumps hermetic construction

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Technical features of a radial pump

  • compact design
  • various impeller designs (open, semi-open, closed) possible
  • single-stage / multistage
  • torque-flow, conduit, peripheral impeller...
  • direct drive without gearbox (compared to numerous positive displacement pumps / also a benefit regarding efficiency and complexity, repair, maintenance,...)
  • dry installation, immersed or submerged
  • sealing systems / hermetically with magnetic coupling or canned motor

Benefits of a radial pump

  • wide range of applications
  • various designs possible (multi-phase pumps, self-priming pumps)
  • pulsation-free
  • constant high efficiencies by means of adaptation of the impellers and diffuser device to the respective impeller diameters
  • low susceptibility and low maintenance and repair costs due to simple design (compared to positive displacement pumps)
  • open impeller design free of axial thrust enables low bearing load and even higher service life

Delivery characteristics of a radial pump

Delivery output: up to 3000 m³/h
Delivery height: up to approx. 1200 m
Rotary speed: 2,900/1,450 (50 Hz) and 3,500/1,750 (60 Hz) (feste Geschwindigkeit), use of frequency controller easily possible
Solids content: up to max. 30 % and up to a max. grain size of 80 mm
Gas content: up to max. 30 %
Operating pressure: up to max. 1200 bar

multi-stage radial pump

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