Open impellers

Impellers are also classified as to whether they are:

1. Totally open,

2. Semi-open (also called Semi-enclosed), and

3. Totally enclosed.

Most totally open impellers are found on axial flow pumps.

This type of impeller would be used in a somewhat conventional appearing pump to perform a chopping, grinding, or macerating action

on the liquid. The blade in the bottom of the kitchen blender is a macerating axial flow totally open impeller. The totally open axial flow impeller moves a lot of volume flow (gpm), but not a lot of head or pressure. With its open tolerances for moving and grinding solids, they are generally not high efflcicncy devices.

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