Column Pump Torque
Column Pump Torque: Quick and Easy with Binsfeld Telemetry
Chicago, Illinois - A civil engineering company in Chicago was hired to determine the start-up torque for a column pump at a water treatment plant for the City. The City desired to upgrade the pump drive system by employing reduced voltage starters to minimize in-rush current.
Some of the oldest pumps in the system required extra power during start-up, nearly twice the operating horsepower, depending on the open or closed state of the discharge valve. This problem could be resolved by over-sizing the motor (a costly option) or by optimizing the timing of the discharge valve opening, relative to the torque load. Both options pointed to one question: How much torque is required for starting the pump?
Engineers used Binsfeld telemetry to transmit live torque signals from Vishay strain gages on the impeller drive shaft while simultaneously monitoring RPM with a tachometer during trial start-ups. The torque and RPM data provided the information engineers needed to make informed decisions on how to best optimize the pump performance. In a matter of hours, real impeller torque measurements pointed to a conclusive solution that would otherwise be only guessed at based on time consuming and complicated modeling.