Anchor Type Agitator


 Some figures of anchor stirrer ars shown below, this types of agitators are used for high
viscous fluid mixing or for slurry. The details about this type of agitator is
discussed further in this post.

Anchor Stirrers

Types of Anchor Stirrer

Type Anchor Stirrer Anchor Type Stirrer are Used in

  1. A U-shaped, flat bar anchor.
  2. A flat blade, paddle type anchor.
  3. A two-arm or three-arm, self-centering anchor with PTFE wiper blades.

Constructions and Working

Anchor stirrers are available in several configurations for use with moderate to
high viscosity materials. This type of stirrer usually works best in vessels
with an inside depth to diameter ratio of 1.5 to 1 or less.

The diameter of a typical turbine style impeller is less than 70% of the tank
diameter. Close clearance impeller for high viscosity applications is 85 to 95 %
of the tank diameter. Some close clearance impellers even have flexible
scrapers, which are effectively 100% of tank diameter.

They are intended to operate at relatively slow speeds and generally require a
heavy-duty drive system capable of generating and delivering sufficient torque
to the agitator. Footless magnetic drives work well with anchor or spiral

Anchor Stirrer is recommended for higher-viscosity. Contoured two-bladed anchor
design for use in blending and heat transfer, with viscosities from 10,000 to
100,000 cP.

The anchor impeller is the most economical laminar flow impeller. It is most
effective in squatty batches where vertical pumping is not as important as in
tall batches. Blend times are somewhat longer than helical ribbon type
impellers. It is the easiest high viscosity impeller onto which scrapers can be
mounted for very difficult heat transfer applications.

Important Features & Application

Important mechanical features of high viscosity mixers are the low speed and
high torque required to rotate large impellers in viscous fluids. Equally
important, but more subtle, are requirements for the tank to have a very round
cross section. The tank must be round so that the clearance between the impeller
and the wall remain nearly constant and the shaft must be centered for the same
Some of the features are listed below,

  1. Most economical Laminar flow impeller available.
  2. Horizontal flow well
    suited for low liquid level geometries.
  3. Solve heat transfer fouling problems
    with optional wall scrapers.
  4. Upright length can vary as required.
  5. Teflon wipers
    can be mounted on the anchor to provide complete tank mixing.


  1. It is used only for High Viscous Material.
  2. Power Consumption is more.
  3. It moves with less rpm.
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