How to determine whether a centrifugal pump is delivering the required flow rate using a pressure gauge?
Thread Content
For the reflux pump in a distillation tower, how can one determine whether the centrifugal pump is operating at the proper capacity based on the pressure gauge? Known parameters: backflow tank pressure, head, density of the backflow medium.
It’s best to check the liquid level in the suction tank; the pressure should be the same as normal. When starting up for the first time, pay attention to how the liquid level changes, and in subsequent starts, keep an eye on the pressure indicated by the gauge and its stability
It is determined based on the pressure lower and upper limits; if the pressure falls below the lower limit, there is a problem.
The pressure is normal and stable, with normal operation
What does it mean for pressure to be normal? Under normal conditions, the inlet valve of the standby pump is open, the return tank is under pressure, and the pressure gauge on the pump outlet also shows pressure, which remains stable as well!
What does it mean for pressure to be normal? Under normal conditions, the inlet valve of the standby pump is open, the return tank is under pressure, and the pressure gauge on the pump outlet also shows pressure, which remains stable as well!
This post was last edited by CHANGBAISHI on 2017-6-29 at 19:27. First, analyze whether the operation of this pump is related to changes in various factors. This pump is mainly used for the reflux in distillation columns; therefore, there must be rising vapor in order to create distillation resistance. So, first, it is to consider the increase in distillation column resistance ； Second, check whether the pressure at the pump outlet changes by adjusting the opening degree of the pump outlet valve. When the valve is opened, the pressure is below the maximum design value; when it is closed, the pressure reaches the maximum design value.
It is possible to determine the operating condition of the pump in use by comparing its pressure with the pressure displayed by the backup pump.
It is not possible to determine whether a pump is operating at its optimal capacity based solely on pressure; instead, this should be assessed by considering factors such as the pump’s operating noise and the sound of the fluid within the pipes, the temperature of the outlet pipe, the motor current, and whether there are any fluctuations in the outlet pressure.