A progressing cavity pump is a type of pump useful for liquids and slurries with a range of viscosities. ■

Dear Alok Goyal,

The sizing of a Screw Pump for Pneumatic Conveying of Cement / Coal / Flyash etc., is already done by the manufacturer of your choice.

Designing a screw-pump conveying system starts with the product and the capacity requirement.

A screw-pump type and size is then selected, according the manufacturers specification.

The next step is to design a pneumatic conveying system that can handle the required rate at a conveying pressure, which is approx. 75% of the maximum allowable screw pump conveying pressure. This to be safe against possible choking and stalling of the screw pump.

Of some screw-pumps, the maximum pneumatic conveying pressure is between 1.8 to 2.0 bar.

The pneumatic conveying design will be for approx. 1.5 bar and result in a bigger pipe diameter and a bigger compressor than when the system was designed for f.i. 2.5 or 3.0 bar.

Keep in mind that the energy consumption of a screw pump is significant and increases with the chosen pneumatic conveying pressure.

Have a nice day

Teus ■