The Marine Propeller is the most common type of mixing impeller. It is an axial flow impeller, having its design rooting in the marine propulsion industry.
Standard Marine Propellers have three blades, but they can be two-bladed, four-bladed, or encased by a circular guard. A revolving propeller traces out a helix in the fluid. One full revolution moves the liquid a fixed distance. The ratio of this distance to the propeller diameter is known as the pitch.
The Marine Propeller is often used with direct drive operating at relatively high speeds (up to 3,000rpm) with low viscosity fluids (up to about 4,000cP).
Marine Propellers are often used in a side entry mixer in large tanks and a top entry mixer in small tanks. They are used for blending, solid suspension, solid incorporation or draw down, gas inducement, and heat transfer.
