The inlet and outlet pipe diameters of the centrifugal pump are the same; the medium is naphtha, and the pressure remains low during loading. How can this issue be resolved?
Thread Content
The existing naphtha loading pump has a flow rate of 80 cubic meters per unit time and a head of 100 meters; the diameters of the inlet and outlet pipes are the same. The pressure during operation is only 0.4 MPA, resulting in very low efficiency. I would like to ask experts: what measures can be taken to improve the efficiency of this pump?
Is the pressure low from the very beginning of use, or does it become low after some time of use? I also don’t know what type of pump you are using. It is recommended to disassemble the pump and check whether there are any foreign objects blocking the inlet, whether the impeller is damaged, and if there is an outlet ring, whether that ring is worn out; also check whether the shaft seal is leaking excessively, etc
What is the specific gravity of naphtha? Is the outlet valve opened too wide? This results in too low a head pressure; what is the actual flow rate during operation? This should have nothing to do with efficiency
Ordinary centrifugal pumps are in this state right from the time they are put into use. At first, when it was put into use in winter, there was suspicion of filter clogging; it was cleaned, but the original 30-mesh filter screen was not removed. The mechanical seal has no leaks. I’m already suspecting that the outlet diameter is too large; I wonder if there are any other reasons as well?
The specific gravity is around 730. The outlet valve should not be opened too wide; if it is, the noise generated by the pump increases significantly, pressure fluctuations become greater, and the flow rate can be heard as being unstable based on the sound coming from the pipes.
This post was last edited by foam_ZPTK on 2019-3-17 22:14. The problem can be solved by using an efficient energy-saving pump. It can achieve very high efficiency.
By low efficiency, do you mean a low head pressure or a low flow rate? If you want a higher head pressure, it might be because the outlet pipe is too small; if the flow rate is low, it’s probably not an issue with the outlet pipe