A wear-resistant ring installed in volute casings to minimize clearance leakage and protect against erosion in centrifugal pumps.
The Wear Ring, also known as a Casing Ring, is a precision-machined annular component installed in the volute casing of centrifugal pumps. It creates a controlled running clearance with the impeller wear ring to minimize internal recirculation leakage, maintain hydraulic efficiency, and protect the main casing from abrasive wear and erosion. These rings are sacrificial components designed for periodic replacement to extend the service life of expensive pump casings.
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Replacement intervals depend on operating conditions: typically 12-36 months for clean water applications, 6-18 months for abrasive slurries. Monitor efficiency drop and increased vibration as indicators.
Standard clearance is 0.0015-0.002 times the ring diameter. For a 200mm ring, 0.3-0.4mm is typical. Consult pump manufacturer specifications for exact values.
Yes, using dissimilar materials with proper hardness differential (typically 50-100 Brinell difference) reduces galling and adhesive wear. Common combinations include bronze/stainless steel or hardened steel/soft iron.
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