Impeller pump Griswold pump company

Increased Capability for Reduced Volumes
Standard ANSI pumps (with expanding style volute casing) are not designed for low flow, high head applications. Throttling or recirculating flow to attain low flow conditions causes excessive radial load and shaft deflection—all of which can result in premature failure of bearings and mechanical seals. Griswold’s Model 811LF series features flow capacities as low as 4 GPM, and heads as high as 920'. Plus, 811LF pumps are designed with a circular concentric casing in conjunction with a radial vane impeller to reduce those excessive radial loads and minimize shaft deflection, thus extending MTBPM.

Circular Concentric Volute Casing
The fully machined concentric volute reduces excessive radial loads, shaft vibration and deflection—extending bearing and mechanical seal life. Class 150 raised face flanges are standard with the Model 811LF series for positive sealing. Class 300 raised face flanges are available as an option.

Low Flow Radial Impeller
When operating in reduced volume conditions, the Griswold impeller’s radial vanes provide better hydraulic control than traditional ANSI impellers. Balance holes reduce both axial thrust and seal chamber pressure, extending bearing and seal life.

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