Selection of pumps for draining from the bottom of the filtrate tank
Thread Content
There is a filtrate tank with a vacuum level of 0.05–0.07 MPa; originally, a centrifugal pump was used for pumping fluid out from the bottom of the tank. Could anyone suggest replacing it with a screw pump?
Screw pumps have self-priming capability, but they cannot create a vacuum! It is recommended to use a water ring vacuum pump!
First, let’s correct the mistake made by the brother upstairs: what the original poster meant was to remove the filtrate, not to create a vacuum; a liquid ring system will not work for this purpose. Since the centrifugal pump can operate, it means that the liquid level of the filtrate above the pump’s inlet is high enough (which ensures sufficient pressure at the pump’s inlet). If the temperature of the filtrate is not high, a screw pump can be used. Current application scope of screw pumps in China: Transported media: lubricating oils, hydraulic oils, diesel, heavy oil (fuel oil), or similar lubricating liquids. Liquid viscosity range: 3–760 mm3/s. Liquid temperature: 0–150°C. Maximum outlet pressure of screw pumps: 16 MPa. Flow rate of screw pumps: 0.25–750 m3/h. Advantages of screw pumps: 1. Wide range of flow rates and pressures ； 2. The viscosity range of liquids for transportation is wide, and there are many different types ； 3. The screw pump operates at high speeds, making it simple and convenient to select the drive unit and speed control mechanisms ； 4. The fluid flow velocity inside the screw pump is low, resulting in low frictional resistance ； 5. The screw pump can start with self-priming and has excellent liquid suction performance ； 6. It can transport liquids containing a high amount of gas, with the gas content ranging from 5% to 20% of the liquid’s volume ； 7. Screw pumps equipped with synchronous gears can transport liquids containing a high amount of impurities, whereas other rotary pumps can only handle clean liquids ； 8. The agitation of the liquid inside the pump is minimal, resulting in very little foaming ； 9. The pump discharge is pulse-free, operates smoothly, with minimal mechanical vibration ； 10. The pump has a compact design, making it easy to install and maintain.
Thank you! You can try a screw pump next time!