Factors affecting the outlet flow rate of centrifugal pumps
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As the title suggests, what are the factors that affect the outlet flow rate of a centrifugal pump? There are two pumps connected in parallel, using gasoline as the fluid, and they are of identical model. One pump operates well, while the other does not – what could be the reason?
The pipeline inlet is asymmetric, the filter is clogged, and the other pump cannot deliver flow. Problems with the pump itself
Clogged filter, stuck outlet check valve, pump cavitation, damaged pump impeller, and so on
It may be that the pump’s inlet pipeline is blocked or the inlet valve is not fully open； It could also be that there are debris inside the impeller of this pump, the motor is running in reverse, or cavitation is occurring due to air not being fully expelled during startup.
The other one is broken. . . .
It could be a problem with the pipeline configuration or a difference in the capacity of the two pumps
If the outlet flow rate is inconsistent while the pipeline configuration, valve opening degree after pump startup, and other external factors remain the same, it is likely that there is a problem with the pump with the lower flow rate. The internal leakage is quite severe
What does internal leakage mean? Where is it leaking?
Internal leakage refers to the situation where the sealing gaps inside the pump become too large due to wear, aging, or other factors, which results in a decrease in pump efficiency and an inability to increase the outlet flow rate. The liquid enters through the inlet, is pressurized by the impeller, and exits through the outlet; after internal leakage, some of the liquid is again pressurized by the impeller and returns to the pump chamber to participate in the circulation.
The models are exactly the same; it’s just that the inlet of one unit is slightly longer, nothing else differs
Although the pipeline is asymmetric, the two pumps are not turned on at the same time; this was discovered when calculating the time of use. A mistake of 2~3 meters in the pipeline should have little impact, right?