The nameplate of the centrifugal pump indicates a head of 47 meters and a flow rate of 11 cubic meters. I would appreciate some guidance on the following issues!
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This post was last edited by wenyuyu on 2010-12-17 at 17:34. A certain centrifugal pump can deliver water with a head of 47 meters and a flow rate of 11 cubic meters, as indicated on the pump’s nameplate. Is 47 meters still sufficient for transporting sulfuric acid with a density of 1.83, and can the flow rate still reach 11 m³/h? Is the outlet pressure for transporting water the same as that for transporting sulfuric acid? How much of a difference can there be, and does the motor also need to be adjusted accordingly? :funk:
Reply to 1# wenyuyu: The head and pressure remain unchanged, but when selecting the pump, it is necessary to increase the motor power – it should be at least one size larger than a normal motor. Due to the difference in specific gravity, higher input power is required to achieve the same head and flow rate; otherwise, the head will decrease.
Reply to 1# wenyuyu: With the head and flow rate remaining unchanged, when transporting sulfuric acid with a density of 1.83, the head is still 47 meters and the flow rate can reach 11 m3/h. The outlet pressure for transporting water is different from that for transporting sulfuric acid; the difference can be as much as 1.83 times, and the motor also needs to be adjusted accordingly.
If the same sulfuric acid is used, due to the difference in specific gravity, more power is required to deliver the same flow rate and pressure.
Is a length of 47 meters still sufficient for transporting sulfuric acid with a density of 1.83? Can the flow rate still reach 11 m3/h? The power of the pump motor increases; the values indicated on the pump’s nameplate are based on water as a reference. Therefore, when dealing with sulfuric acid whose density is 1.8, the motor power is roughly 1.8 times that of the original pump. This factor needs to be taken into consideration when selecting a pump. The water pressure can reach the figure indicated on the nameplate. When pumping water, the head of the pump remains essentially 47 meters, which is equivalent to 4.7 MPa; whereas when pumping sulfuric acid, its density is higher, so if the resistance in the subsequent system is not taken into account, the pressure will be 47 × 1.8 = 8.5 MPa.
Can an IS pump used for water pumping be used to pump sulfuric acid? When ordering the pump, the owner should provide the pump manufacturer with the desired process parameters.
For the same pump, the head required to pump water differs from that required to pump sulfuric acid (H=Pη/Qρ), and this varies depending on the pump’s power and the density of the medium； For pumping acidic media, corrosion-resistant pumps are preferred.
The last edit to this post was made by jxcad2005 on 2010-12-19 at 18:20. Regarding the issue raised by the original poster, it is first necessary to determine the shaft power required by the pump when transporting water. When transferring to a medium with a density of 1.8, it is sufficient as long as the motor has an adequate safety margin in terms of power; there is no need to replace the motor. The material of the pump also needs to be taken into consideration. 100M head = 0.981MPa ；