Analysis of inlet pressure in centrifugal pumps
Thread Content
With the centrifugal pump in operation, the pressure inside the tank is 0.1 MPa; there is also a water column of 4 meters inside the tank. Assuming no pressure loss at the inlet, would the pressure then be 0.14 MPa? \ud83d\ude00\ud83d\ude00I think the inlet static pressure is 0.14 MPa; since the flow velocity at the inlet is high while the pump is operating, the inlet pressure surely can’t be as low as 0.14 – it must be much higher than that, right?\ud83d\ude0a
Not necessarily; it also depends on the resistance in the pump’s inlet section and the piping accessories~~
That’s the case with static pressure; after the pump starts, due to pipeline losses, the value is no longer the same
Will the inlet pressure become negative after the pump starts?
Does the inlet become negative pressure after the pump starts?
It depends on the vapor pressure of the material and the resistance in the inlet piping; for those with a very high volume and a low vapor pressure (less than 0.1 MPa), negative pressure is possible
Ignoring pressure loss, what about the inlet pressure?
Forget it, why do you even ask such a question?
Well, I was wondering that when the flow rate of a liquid entering is high, the pressure should decrease, right?
The greater the flow rate, the greater the loss, and the lower the inlet pressure
Thank you for the guidance; I guess I went down a wrong path in my thinking.