A typical stirred tank has following main design elements
Tank Design: Most commonly, stirred tanks are cylindrical vessels with a top and a bottom dish. The top and bottom dish are either (1) Elliptical (2) Tori-spherical (3) Hemispherical or (4) Conical. The cylindrical tank have typical H/D ratio of more than 1. The Cylindrical Height, H, Tank Diameter (DT) and the dish height needs to be specified (or designed) to meet the production target
Impeller: Impellers are the heart of the Stirred Tank. Impeller selection and design are the most critical design elements. Impellers are selected to meet the process requirements. The selection is also guided by the viscosity of the fluid and the number and nature of the phases involved. Most commonly, Impellers are classified as (1) Axial (2) Radial and (3) Tangential flow impellers
Internal Accessories:
Baffles: Tanks are commonly employed with four baffles of height equal to the maximum liquid height.
Internal Coils: Another internal is a heating/cooling Coil. Depending on the heat transfer requirements, the dimensions of the coil are designed. The internal heating coils are of different types like A) Single or Multiple concentric Helical Coils (B) finger type coils placed vertically near the walls
Spargers: For gas-liquid systems, spargers are used to disperse gas. The spargers could be ring spargers, sintered pipes or dip tubes.