Vacuum pump and circulation pump of the PVC stripping tower
Thread Content
This post was last edited by waterkingsb on 2012-2-6 at 08:35. In our PVC plant, material is first fed into the stripping tower; at the same time, a circulation pump is used to circulate the fluid, heating it to over 60 degrees. Afterwards, vacuum is created, with a vacuum level of 0.8 to 0.9； Now, when the vacuum level reaches 0.8–0.9, it becomes very difficult for the circulation pump to circulate fluid. Could you tell me why this is?
Cavitation inside the pump, with a gas phase present; the impeller lacks centrifugal force, so it cannot pump. It is recommended to lower the position of the pump or raise the height of the tower outlet to increase the liquid level difference.
I fully agree with the view above: as the temperature rises and pressure drops, cavitation in centrifugal pumps becomes a problem that prevents them from functioning properly.
There is gas inside the pump, and the system is under negative pressure.