Centrifugal Pump for Ultrasonic Cleaning Machine

Michael Smith Engineers has supplied a Finish Thompson centrifugal pump to Guyson International for testing on a demonstration ultrasonic cleaning machine. The pump needed to withstand the rigorous conditions found in ultrasonic cleaning machines, including the need to transfer volatile, near-boiling solvents. Guyson manufactures blast finishing, spray wash and ultrasonic cleaning equipment and supplies equipment, spares and consumables.

Its Kerry ultrasonic cleaning equipment includes aqueous and solvent-based systems that have applications in precision engineering, electronics, aerospace, metal finishing and medical manufacturing. Ultrasonic cleaning works by introducing energy into a tank containing the cleaning solution and this causes minute bubbles to form and collapse within the solution. This action is cavitation and results in a gentle, highly effective scrubbing action on the component surface, which loosens the contaminant.

As a result of this ultrasonic cleaning is acknowledged as a rapid and highly effective method of precision cleaning of components. Where manual cleaning or spray wash methods are less effective with blind holes, tube intervals or difficult-to-reach crevices, ultrasonic cleaning is an effective alternative. The pump - a magnetically coupled centrifugal model in PVDF construction from the Finish Thompson DB range - was selected by Guyson following in-service reports that had identified the potential for failures of the main circulation pumps on some models of its solvent-cleaning machines.

Guyson had identified that the combination of handling volatile, near-boiling-point solvents with a low-suction head had resulted in very low pressures at the pump inlet with NPSHa levels occurring of typically less than 1m. On many other types of pump this would cause severe cavitation and inevitably lead to regular failures. The DB pump was tested on a demonstration ultrasonic cleaning machine and found to perform well without failure under all test conditions. These operating scenarios included dry running, starved suction by closing the suction valve, and dead heading by closing the discharge valve. After extensive running, the pump was removed, stripped down and inspected for wear to the impeller, shaft, bearings and thrust rings.

All were found to be in perfect condition. The Finish Thompson DB range of centrifugal magnet drive pumps includes eight series of pumps handling capacities of up to 50m3/hr and differential heads up to 43m. The pumps' seal-less mag-drive design makes them a suitable alternative to mechanically sealed pumps, particularly in corrosive duty applications. Superior run-dry capability helps to protect the pump from system upset or operator error, eliminating expensive repairs and downtime.

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