Impeller thinning
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The vacuum residue pump for the first stage of vacuum distillation is a pump manufactured by Ebara in Japan; after being in use for about ten years, it was found that the impeller had become significantly thinned. Is it cavitation or erosion?
When it comes to thinning of the impeller, it is necessary to determine whether the thinning is uniform or localized, or even if there are pits present. If the thinning is uniform, it is likely caused by erosion and corrosion; whereas if the thinning occurs in localized areas or at specific points, it is caused by cavitation. It is important to analyze the composition of the fluid being transported, as well as the vapor pressure at the pump inlet, to determine whether vaporization might occur. The vaporization of the fluid can be reduced by increasing the pressure in the storage tank, thereby minimizing cavitation in the pump
In the case of cavitation, doesn’t pitting generally not occur at the inlet area of the blade?
“The erosion caused by \"cavitation\" features pit-like corrosion, while uniform thinning is due to scouring. It is recommended to start with the analysis of impurities in the medium. Uniform corrosion due to long-term use is also possible. If cavitation occurs, there is often a decrease in flow rate and pressure or the device stops working; it’s best to check the operation records. For reference.
Erosion corrosion is more likely; the impeller surface affected by cavitation is covered with hole-like defects!
Personal opinion, for reference only; no exclamation points needed, thank you!
I’m here to see what the results are. Ten years is not a short period of time, so the possibility of cavitation is low. I didn’t use any punctuation marks
Agree with what was said above; whether there are any pitfalls will show it all