Can a centrifugal pump operate at a low flow rate for a long time?

This post was last edited by ylb913 on 2015-12-1 21:33. To be honest, this is a common occurrence, but it’s necessary to test it under actual operating conditions to check for cavitation or to see if the pump body heats up. I just replied to a related post; I’ve actually attached many relevant images on Haichuan already. http://bbs.hcbbs.com/thread-1508471-1-1.html

It can be used, but the resistance loss is high

It definitely won’t work; it can easily damage the seal

Generally, there are no major issues, but it depends on the specific centrifugal pump and the operating environment.

Generally, there are no major issues, but it depends on the specific centrifugal pump and the operating environment.

Under normal circumstances, it is most appropriate for the pump to operate at its rated conditions; it can also run with a low flow rate over a long period of time, with the flow rate being adjusted primarily by the outlet valve. But that’s not very economical; it feels like using something too good for the task

Sure, turn the reflux up to full. Reduce the export setting

1. Observe the performance curve of the centrifugal pump; it consists of several zones: the optimal operating zone and the allowable operating zone. Since there is an allowable operating zone, there is also a zone where operation is not permitted. 2. In the optimal operating zone, from the perspective of efficiency, the fluid operates under the conditions of the most efficient hydraulic model. 3 In areas where operation is not recommended, in addition to very low efficiency, mechanical vibrations occur due to the fluid deviating significantly from the hydraulic model, which is also detrimental to sealing. 4 For certain media, there are requirements regarding thermal-controlled flow and stable flow limits at low flow rates. 5 Operation at extremely low flow rates is sensitive for pumps of slightly larger sizes; the failure rate of seals increases significantly, and leaks of petrochemical fluids lead to a substantial increase in safety risks. Such conditions warrant prohibition of operation, but determining the critical point currently still relies on the operator’s experience. 6 To determine whether there are any abnormalities with the pump in question, vibration measurements can be used for comparison, and the results can help decide how to control the flow rate

Thank you so much, I’ve learned~:)

The temperature of the pump body will rise; if it is a medium that vaporizes easily, evacuation will occur, damaging the mechanical seal