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May 11, 2022 View:

How To Choose A Rotary Lobe Pump Rotary Lobe Pump Selection Needs To Know

The rotor pump is a self-priming volumetric pump, which does not require manual pumping. It has a strong self-priming force, smooth delivery, low pulsation and low shear, and can deliver mixed media of gas, solids and liquids as well as media sensitive to truncation. In addition, for different working conditions, the lobe pump can be equipped with special devices such as safety valves, insulation and cooling, so as to achieve different working conditions.

Viscosity affects pump speed

The operating speed of the pump needs to be selected according to the size of the medium viscosity, the higher the viscosity of the material, the lower the corresponding pump speed should be. The right speed will enable the pump to obtain better results and longer service life, while too high a speed will lead to pump operation cavitation, vibration and noise. Users can initially choose the lobe pump speed according to the following table.

lobe pump

[lobe pump] Viscosity - Speed curve

lobe pump

Solids content affects pump speed

The speed of the pump needs to be selected according to the size of the solids content of the medium. The higher the solids content of the material, the lower the speed of the pump should be. The right speed will enable the pump to achieve better results and longer service life, while too high a speed will lead to abnormal wear and tear of pump components, high failure rates and high maintenance or replacement costs. Users can initially choose the lobe pump speed according to the following table.

lobe pump

[lobe pump] Solids content - speed curve

lobe pump

Performance range of spiral lobe pumps

lobe pump

Basic steps for selecting a lobe pump

1、According to the required flow rate and pressure, refer to the pump performance range table and make a preliminary selection of the pump model.

2. Substitute the flow rate and pressure into the performance curve of the selected pump to obtain the pump speed. Combine with the medium solid rate and viscosity, check whether the selected speed is reasonable, such as unreasonable, it is necessary to re-select the type.

3、Substitute the speed and pressure into the shaft power curve of the selected pump type to derive the pump shaft power and select the appropriate motor power (motor power shaft power 1.15).

4. According to the properties of the medium, choose a suitable material for the overflow components.