WEMCO® Pre-Rotation Basin

This product is designed to direct flow to the tangential entrance channel. The direction of flow through the channel creates a rotation of the fluid inside the pre-rotation basin, before it enters the pump. The rotation of the fluid inside the basin folds floatable solids off the surface and into the pump flow stream, allowing removal from the wet well. The rotation also breaks up surface vortices, allowing a much lower minimum operating level than with conventional submersible pump stations. This lower operating level scours the bottom of the wet-well, re-suspending settled solids so they too can be removed from the wet-well. The combination of removing the floating and suspended solids results in a wet-well that automatically cleans itself every time the pre-rotation pump runs through its operating cycle.