Selection and Design of Impeller

Small pitched blade impellers with diameter D T/2.5, located nearer the vessel base (C T/4), are good for solid suspension (see Table 10-3). They also aid in the discharge of the solids during slurry transfer. Typical values for impeller clearance are T/4 for hydrofoils and T/3 for pitched blade turbines. 

For glass-lined vessels, one is no longer limited to the Pfaudler crowfoot, also known as the retreat blade or retreat curve impeller (RCl). Most impeller 

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