The Ruhrpumpen Type ST is a horizontal centrifugal pump with non-clogging and non-stringing two-channel impeller in pot design for dry installation and universal use, suitable for pumping sewage with coarse solid matter and fibrous content without upstream screen.

  • Horizontal installation. Vertical installation also available (STV).
  • Single Suction.
  • Single Stage.
  • Two channel pot impeller.
  • Bearing bracket.
  • Radially split.
  • Tangential Discharge Nozzle.

  • Capacity 400 to 8,500 m³/h
  • (1,750 to 37,500 U.S. gpm).
  • Head 3.5 to 32 m (11.5 to 105 ft).
  • Discharge flange size 12” to 28”.
  • Maximum Pressure 4.5 bar (65 psi).
  • Temperature -10 to 80 ºC (14 to 176 ºF).


  • With bearing bracket for direct drive by electric motor, diesel engine, etc. via flexible coupling or via V-beltdrive, e.g. with pick-a-back mounted electric motor mounted on a common base plate.
  • ST-bloc horizontal pump in compact design, for direct coupling with electric motor.
  • Back shroud blades on the impeller serve as axial thrust compensation and protection against intrusion of particles into the area of the shaft seal.

  • Disposal or waste water.
  • Raw sewage.
  • Activated sludge.
  • Mixed water.
  • Fecal Matter.
  • Rain Water.


  • Casing: Cast iron GG-25.
  • Wear Ring: Cast iron GG-25.
  • Impeller: Cast iron GG-25.
  • Shaft sealing: PTFE-coated sealing rings with grease lubrication.
  • Shaft sleeve: G-X20 Cr14
  • Seal cover: Steel.
  • Pump shaft: Steel C 45.
  • Motor shaft: Steel C 45.

  • ST

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ST / STV. Sewage Pumps Horizontal and Vertical Installation.



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