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Common faults and repairs of water ring vacuum pumps/compressors: Common faults and solutions for water ring vacuum pumps/compressors: Fault, Cause, Solution. Insufficient pumping capacity: Excessive clearance – Adjust the clearance; Leakage at the packing area – Tighten or replace the packing, reduce the water supply temperature. High temperature of the water ring – Increase the water supply volume. Leakage in the piping system – Tighten the flanges and bolts, replace gaskets or weld the threads. Excessive flow resistance in the intake pipeline – Reduce the number of bends, use thicker pipes. Decreased vacuum level: Leaks in the piping system – Fix the leaks. Packing leakage – Tighten/replace the packing; Excessive clearance – Adjust the clearance. Overheating of the water ring – Reduce the water supply temperature; Insufficient water volume – Increase the water supply volume. Increased temperature of the water ring due to friction between parts – Adjust/replace the relevant parts. Vibration/noise: Loose corner bolts – Tighten the bottom corner bolts; Foreign objects inside the pump causing abrasion – Stop the pump, inspect and remove the foreign objects. Cavitation: Open the valve on the intake pipeline. Blade detachment: Replace the blade. Overheating of bearings: Insufficient lubricating oil – Check the lubrication level and add oil. Packing too tight: Loosen the packing gland slightly. Insufficient supply of seal water: Supply more seal water. Excessive tightness in the fit between bearings/axis/bearing housing: Adjust the fit between these components. Damaged bearings: Replace the bearings. Difficult start-up: Rust inside the pump after long periods of inactivity – Rotate the blade several times by hand or with tools. Packing too tight: Loosen the packing gland. Uneven wear between the blade and the pump body: Adjust/replace the components. Leakage from the mechanical seal: Damaged mechanical seal – Replace it. Loose springs in the mechanical seal: Adjust the elasticity of the springs. Damaged “O”-ring seals: Replace the “O”-ring seals. Pump not starting properly: Axial movement of the blade – Tighten the blade again. Foreign objects on the blade surface causing jamming: Remove the foreign objects