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Marine Propellers

Marine Propellers

          The Marine Propeller is an axial flow impeller generally pitched for downward pumping action, however, upward pumping is also available. This impeller provides a high, uniform discharge and therefore is best suited for low viscosity liquid blending applications.

          Standard propellers have three blades, but 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. Marine type is often used as a side-entering mixer in large tanks and as a top-entering mixer in small tanks. It can be designed with a different pitch to change the combination of pumping rate and thrust.

Advantage :

  • The marine propeller was probably the first axial flow impeller and used for low to mediumviscosity media.
  • Most marine propellers used for mixing have three blades and pitch to diameter ration 1.0 or 1.5.
  • The flow stream can generate upward or downward.
  • Propellers draw less power than most other impellers of the same diameter and run in the same speed.
  • This impeller type is especially suitable for blending and suspension duties.

Technical features :

  • They are used at relatively high speeds (up to 2,900rpm) with low viscosity fluids, up to about 4,000 cp.

Applications :

  • Used for blending, solids suspension, solids incorporation or draw down, gas inducement, and heat transfer.