Casing/Volute is the stationary housing in a CIP return pump that converts kinetic energy into pressure energy by gradually expanding flow area.
The casing, also known as volute, is a critical stationary component in centrifugal pumps like CIP return pumps. It's a spiral-shaped housing that surrounds the impeller and collects the fluid discharged from it. The casing's primary function is to convert the high-velocity kinetic energy from the impeller into usable pressure energy through its gradually expanding cross-sectional area. In CIP (Clean-in-Place) return pumps, it must withstand aggressive cleaning chemicals, temperature variations, and maintain hygienic standards.
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316L stainless steel offers excellent corrosion resistance against CIP cleaning chemicals (acids, caustics, sanitizers), has low carbon content to prevent sensitization during welding, and meets food/pharmaceutical hygiene standards.
Single volute has one discharge channel and is cost-effective for standard applications. Double volute has two discharge channels 180° apart, which balances radial loads on the impeller shaft, reducing vibration and wear in high-pressure applications.
Casing wear increases clearance between impeller and volute, reducing efficiency through increased recirculation and pressure loss. Severe wear can cause vibration, noise, and premature bearing failure.
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