ANSI D OPEN IMPELLER

Open Style Impeller

A front vane open style impeller has two sets of pumping vanes and two critical tolerance locations:

Wear causes axial thrust loads and seal chamber pressure to increase as the seal chamber gap widens.

But the impeller cannot be adjusted to both tolerance locations at the same time. Seal chamber pressure and bearing loads increase after each adjustment. Performance is diminished and seal and bearing life suffers as a result.