Ask about the head of a centrifugal pump
Thread Content
Dear experts, I would like to ask: for a centrifugal pump, when the density of the medium is 1000 kg/m3, the flow rate is 1 m3/h, the outlet pressure is 0.3 MPa, and the power consumption is 3.6 kW (with the motor having a power rating of 5.5 kW), what are the relevant parameters?； Now that the medium density has increased to 1300 kg/m3, with the same pump and an unchanged flow rate of 1 m3/h, is the outlet pressure 0.3*1.3=0.39 MPa?
Both the flow rate and pressure remain constant. If the specific gravity is 1, the shaft power is 3.6 kW; therefore, when the specific gravity is 1.3, the shaft power becomes 3.6 * 1.3 = 4.68 kW (a 5.5 kW motor is sufficient).
What was said upstairs is correct, but with such a large change in medium density, it is not recommended to use it
Yes, P=ρGH; the head provided by a pump remains constant, so your theoretical calculation is correct.
Yes, the head remains unchanged. The power becomes 1.3 times, 4.68 kW – no problem at all.
Why is it not recommended? Is there a problem?
The head will not change; if the viscosity of the medium changes, then the head will change.
:lol:55555555555555
To listen to the one on the 2nd floor – absolutely correct! !
For the same pump, as long as the rotational speed and impeller diameter remain unchanged, the head will stay the same; the pressure can be calculated using P=ρgh
Under the same conditions, when pumping the same volume of fluid, the higher the viscosity of the fluid, the greater the output power of the pump. Based on your density changes, it’s as if it was a gasoline pump before, but now it’s used for transporting slurry oil. Using a gasoline pump to pump slurry will cause some damage to the pump’s lifespan; think about it carefully