All other impellers are of fabricated construction and can be either Bolted or Welded type.ĭiameter of Impeller: Diameter of impeller depends on diameter of tank. Impellers may be one piece or split into two or many pieces, bolted together.
Hub is installed on the shaft by shaft key and grub screw. Main parts of impeller are hub and blades. Marine Propeller, Axial Flow Turbine, Turbo Propeller, Disc Blade turbine, Flat Blade Turbine, Backward turned turbine, Paddle, Anchor, Anchor/Paddle or Gate. Impellers: There can be following simple Impellers. However, agitator is also installed in vertical rectangular tank, in water and waste water treatment tanks. Shape and size of tank: Vertical cylindrical vessel is the best type for installing an agitator. Agitator is located off-center if some part of vessel is occupied by internal coil or some other internal.
Location of agitator in the equipment: Generally agitator is centrally located for better flow pattern. When both patterns of circulation are required, radual flow impeller is installed at the bottom of agitator shaft, while radial flow impeller is installed at the center of agitator shaft. When the contents are to be mixed, radial circulation is prefered. When a vessel is heated or cooled by coil or jacket, axial flow is prefered. Agitator can also mounted horizontally from side of a tank, called side entering agitator, for very large diameter storage tanks. This is the normal practice for mounting an agitator in small and medium size tanks. Type of Agitator: Generally agitator is mounted vertically at the top of the tank. Degree of agitation increases with increase in number of revolutions of agitator and increase in impeller diameter. For Mild mixing, time required for total mixing can be few hours. For Moderate mixing, time required for total mixing can be few minutes. For Vigourous mixing, time required for total mixing can be few seconds. Type of Agitation: Agitation can be Vigourous, Moderate or Mild. For Agitators / Mixers, factors to be considered for design are
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