CP PUMPEN AG, Im Brühl, 4800 Zofingen, Switzerland
Tel. +41 62 746 85 85, Fax +41 746 85 86, info##at##cp-pumps.com


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Side Channel Pump

The Side channel pump is a niche product between the Displacement and the Centrifugal pump. Originally, the Water ring pump was intended to pump mixtures of air, gases and liquids. Today, the Side channel pump has become indispensable in many applications.

Side channel pumps have the following characteristics:

  • they are automatically self-priming
  • they have an ability to transport gas without interrupting the liquid flow or without damaging the bearings due to dry running
  • they have their highest power consumption at their highest discharge pressure and their lowest flow rate
  • their steep Capacity/Head (Q/H) curves are ideal for pressure-dependent system regulation
  • they need very low suction heads (NPSH)
  • their narrow columns (side channels) do not allow abrasive components in the liquids

When started, the pump begins to work as a Displacement pump due to its self-priming characteristics, but once the side channels are completely filled with liquid, the pump will work as a Centrifugal pump. Due to the centrifugal effect, the fluid is collected in the outer region of the side channel as well as the wheel cells, where it forms the liquid ring responsible for its self-priming characteristic. On the inside, the gas is concentrated. Side channel pumps can also operate as Vacuum pumps during a limited amount of time, before the auxiliary liquid increasingly heats up and finally evaporates.

In addition to the self-priming ability, this pump type has the supplementary advantage of handling large gas flows with the liquid. In certain processes, it is a requirement that a pump can, at least temporarily, evacuate gases and vapours from the process without the liquid flow being interrupted. Normal radial centrifugal pumps have a very limited capability of transporting gas within the medium. Even at relatively low gas contents, the liquid flow can immediately interrupt or damage the pump bearings due to dry running.

The pressure build-up caused by the sum of the individual pulses during the liquid movement creates an internal multi-stage-effect, even with just one impeller. Lower potential pump speeds become possible due to higher pump heads and therefore help to reduce the pump’s NPSH value against high-speed pumps. A slower pump speed has the additional advantages that mechanical loads, part load performance, and noise can be controlled better and the pumps’ expected service life is generally increased.

Finally, the lower the specific speed of a pump, the better is its absorbency and the lower are the danger of cavitations. The side channel pump with variable vapour pressure is significantly less vulnerable to cavitations compared to radial centrifugal pumps.

CP’s Side channel pump

CP’s plastic magnetic coupled Side channel pump is particularly recommended for low flow rates (Q from 0.1 to 2.5 m³/h) and medium heads (H up to 35 m). The pumped liquid and the operating conditions determine the selection of the materials. The casing material ranges from PTFE to PVDF. The pump is made without a shaft seal: the diving torque is merely transmitted with a permanent magnetic synchronous coupling (magnetic drive).

These CP pumps are available: MSKS

 


    
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