CP PUMPEN AG, Im Brühl, 4800 Zofingen, Switzerland
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Peripheral Pumps

A peripheral pump is a niche product in-between a displacement pump and a centrifugal pump, in which the medium is pumped into a peripheral channel. Today, the peripheral pump has become crucial in many applications.

Peripheral pumps have the following characteristics:

  • The ability to transport gas without interrupting the fluid flow or damaging the bearings due to dry running.
  • Maximum power consumption at their highest head and lowest flow rate.
  • Steep capacity-head (Q-H) curves ideal for pressure-dependent system regulation.
  • Insensitive to reverse rotation.
  • Very low suction head (NPSH) required.
  • Narrow columns (peripheral channels) not suitable for abrasive particles in the fluids.

When the pump is started, the fluid is sucked through the suction flange directly into an annular channel in which the peripheral impeller rotates. The impeller consists of straight vanes that set the fluid into a circular motion. After passing through the annular channel, the fluid exits the pump through the outlet. In the annular channel, kinetic energy is imparted to the fluid by the vanes, increasing the fluid pressure. This working principle is very similar to how a side channel pump works.

Unlike ordinary centrifugal pumps, the characteristic curves do not flatten as the fluid flow decreases. The pump curves are rather straight lines with maximum heads at low flows and low heads at peak flows because a peripheral pump is a displacement pump.

CP’s peripheral pumps

CP’s magnetic drive peripheral pumps are especially recommended for low capacities (Q between 0.1 and 8 m³/h) and high heads (H to 170 m). The choice of material depends on the pumped fluid and operating conditions. High-alloy stainless steel, nickel or nickel-base alloys and a variety of high-grade plastics can be used for the casing. The pumps have no shaft seal, with drive torque being transmitted merely by a permanent magnetic synchronous coupling (magnetic drive).

CP's peripheral pumps: MKPP, MSKPP

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