Centrifugal screw pump or impeller 3

This is a centrifugal pump with an flow inducer at the inlet. The screw allows the centrifugal pump to operate at a lower NPSH (net positive suction head) without cavitation. Hot condensate can flash into steam with the slightest drop in pressure.

Thanks Compositepro!!
I am here only for a week now and already impressed by the help i am getting.
Hope one day i can also contribute.

Can't add anything to that. It works by gently helping the flow into the eye of the impellor to reduce NPSHR.

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And don't be surprised if you see other ones of these and they look very different.
Each pump mfg tends to use their own style.
These are also used in cases where you know that you are pumping a two phase flow and want to prevent the gas from collecting and blocking fluid entrance to the eye.

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P.E. Metallurgy, consulting work welcomed

fixing an inducer to combat cavitation in pump: