Questions about the pressure of the buffer tank at the inlet of a centrifugal pump and the effective cavitation margin of the pump
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I would like to ask, increasing the liquid level difference can increase the effective cavitation margin of the pump. If the pressure of the buffer tank is increased, can the effective cavitation margin of the pump also be increased? Can any expert explain the principle?
I have an understanding, I don’t know if it’s right or not. For non-volatile media, increasing the pressure and liquid phase can increase the effective NPSH of the pump. However, for volatile substances, increasing the inlet pressure will break the original gas-liquid balance and the gas phase will dissolve in the liquid phase. If this part of the gas phase will have a counterproductive effect in the center of the impeller and make it easier to cavitate, will it offset part of the effect of increasing the inlet pressure?
Your idea is correct. Increasing the inlet pressure and increasing the liquid level in the inlet buffer tank can effectively avoid cavitation. The second problem is that increased pressure will indeed increase the absorption of light components in the solvent, but pressure and solubility are not of the same order of magnitude, so this concern can be eliminated.
Increasing the head difference and increasing the inlet tank pressure both increase the effective NPSH. https://bbs.hcbbs.com/thread-1764877-1-1.html