AFinish Thompson centrifugal
pump is withstanding the
rigorous conditions found in
ultrasonic cleaning machines,
including the need to transfer
volatile, near boiling solvents. The
pump was supplied to Guyson
International for testing on a
demonstration machine by UK
distributor,Michael Smith Engineers.

The pump, a magnetically
coupled centrifugal model in PVDF
construction was selected by Guyson
following in-service reports that
identified the potential for failures of
the main circulation pumps on some
models of its solvent cleaning
machines. Guyson identified that the
combination of handling volatile,
near boiling point solvents with a
very low suction head had resulted in
very low pressures at the pump inlet
with NPSHa levels occurring of
typically less than 1m. On some
pumps this would cause severe
cavitation and lead to failures.

The DB pump was tested on a
demonstration ultrasonic cleaning
machine and found to perform well
without any failure under all test
conditions. After extensive running it
was stripped down and inspected for
wear. It was found to be in perfect
condition.