60 Seconds with Summit Pump

This issue compliments an earlier issue (Volume 1 issue 12 from April 2018) on the same subject.  I am frequently asked; should the discharge valve be open or closed when the pump is started? My answer is….it depends, but regardless the suction valve better be open. First Things First Let me state that as visitors to client facilities we

Rolling Stone’s front man Mick Jagger’s second favorite song verse is “start me up”…”I’ve been running hot”.   Did you also know there are restrictive limits regarding the number of times an induction motor can be started in a given time period? The restrictions are due to (“running hot”) temperatures and for that singular reason it

Be very careful on self-primer lift applications because the liquid temperature directly affects its vapor pressure and that… …changes the Net Positive Suction Head Available (NPSHA). Example: Self-Primer – two temperatures… two outcomes: For the example we will use two versions of the otherwise same application. The applications are identical in both versions except the temperature

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 time the NPSHR will also increase. This effect

“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 of field experience with pump troubleshooting; I’ve found almost 80 percent of all centrifugal

What is slip? How does it affect Positive Displacement Pump performance? Is Your Pump Slipping? 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

  Baseplates: Flat and Level Pump Alignments We all know that proper alignments between the pump and the driver are critical. Did you know that the bearing load increases in direct proportion with the misalignment? But even more importantly, a bearing load increase will decrease the bearing life by a cubic function. Simply stated, if the bearing load increases by a factor of two, due to misalignment, then the bearing life decreases by a factor of eight. Warning: All pumps must be final aligned in the field. No matter how precise the alignment from the factory, it will be lost when the unit

  Truth: Pumps Shipped From the Factory are NOT Ready to be Started and Operated Once a year I attempt to remind all Summit Pump distributors of the “Plug and Play” myths that unfortunately persist in the pump universe, like fake moon landings and that the earth is flat. Please make sure you and others