Here are some brief reminders about NPSHA and NPSHR. NPSH changes with: Impeller diameter: For the same flowrate on a given system an impeller of a smaller diameter will have a higher NPSHR. Clearance of impeller and wear rings: As clearances open up on the pump over...

“Your pump isn’t producing enough flow!” “I can’t get enough pressure out of your pump!” “Your pump is making noise!” We often get these calls from the field.  While it is entirely possible, in reality, it is rarely the pump’s fault.   From my almost fifty years...

Several times a month we receive an inquiry from a concerned customer that the “stainless steel” they received from Summit Pump is magnetic and/or appears to be rusting. We assure them there is no issue, and explain as follows.  In the case of plain/standard 316-SS,...

Fluid slip is a common term used to describe reverse fluid flow inside a pump or other turbomachinery. Slip is affected by internal clearances of the parts, temperature, pressure and viscosity. In a positive displacement pump, slip can be easily calculated just by...