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3.3 Avoiding Pump Cavitation
When the pump cavitates due to a flowrate that is too high for the suction line size and the product
viscosity, the flowrate needs to be lowered. The NPSH Optimized Pump Face from
in pressure gauge port to install a vacuum sensor to indicate the NPSH directly at the pump head. With the
feedback signal from the vacuum gauge, the pump can be safely operated at min NPSH required, resulting
in its max speed for the given setup without damaging the product and pump.
3.4 Pumping Sensitive Products
Sensitive product like macaroni & cheese sauce or cooked potato pieces can easily be pumped without
creating damage to it if the pump housing and the spindles are correctly sized. However, if the pump
suction is too strong, sensitive product contents like macaroni can be stretched and break apart. In this
case, the flowrate must be lowered as a momentary solution. For a long term solution, the pump suction
system must be modified by increasing the suction line size and removing flow restrictions like valves,
Tee's etc. The NPSH at the pump face should read between 2 and 4 feet, depending on product.
Note that -14.5 psi (- 1 bar) is absolute vacuum on this planet. If the suction line is undersized, hence the
NPSH is too low or almost zero, no pumping system exists to provide the desired performance.
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3. OPERATION
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Processtec
PROCESSTEC INC. 2022
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