Tank

The size, shape, and type of tank influence the choice of the suitable agitator. The larger the tank, the higher the stirring performance should be. In larger tanks, several agitators are usually used at the same time. In addition, structural conditions must be considered. For example, an open lagoon does not offer the possibility of installing agitators on the wall or ceiling. In contrast, a closed container with a concrete ceiling allows this installation.

The material of the tank (steel or concrete), however, has little influence on the choice of agitator. Instead, it has little impact on how the agitator is mounted on the tank. Due to the statics of steel tanks, different constructions or supports must be used than for concrete tanks.

When analyzing digesters, the following points must be considered:

• What is the digester material? (E.g., steel or concrete)
• What digester geometry is it?
  • Shape (e.g., cylinder, cuboid, cone, etc.)
  • Dimensions: diameter and height and their ratio
  • Wall thickness
• Type of coverage (if any)
• Openings
• Location above or below ground level
• Constant or changing level? – What is the minimum/maximum level?
• Is there already installed stirring technology?
• Are there any particular features?