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Falls just below the minimum impeller size, you may use that pump by adding false. Recall that we learned to make corrections to the pressure drop calculation for glycol. Note that this is a piping friction (head) correction. We also learned to calculate. (“centrifugal force”). This causes an increase in the. Understanding Net Positive Suction Head. Atmospheric Pressure. It would be wonderful if proper NPSH calculations had been run for every pump installation, but for thousands of cavitating pumps out there it’s not too late. - Increasing the size of the suction piping or decreasing the length - Reducing obstructions such as valves.