Abstract

This chapter focuses on mixers, which are devices that blend combinations of liquids and solids into a homogenous product, and agitators that provide the mechanical action required to keep dissolved or suspended solids in solution. There are two primary types of mixers—propeller/paddle and screw. Propeller/paddle mixers are used to blend or agitate liquid mixtures in tanks, pipelines, or vessels and the screw mixer uses a single or dual-screw arrangement to mix liquids, solids, or a combination of both. The primary indicator of acceptable performance is the quality of the product delivered by the mixer. Installation of propeller-type mixers varies greatly, depending on the specific application. There are three major operating concerns for mixers—setup, incoming feed rate, and product viscosity. Most of the problems that affect performance and reliability are caused by improper installation or variations in the product's physical properties. Proper installation of mixers and agitators is critical.

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