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  1. pumpingwell

    pump ragging vs speed/flow

    Hi All To answer the question: Is ragging linked to speed or flow? My opinion: Too small a flow may lead to ragging of the pump. In low flow or low speed in VSD operation, the pump ragging risk increases mainly due to complicated pump internal flow patterns, i.e. recirculation. Many pumps...
  2. pumpingwell

    NPSHr (H2O vs Flowing Fluid) and Calculations

    Kawartha and d23, Thanks for your quick response and/or comments. "Wastewater Engineering: Collection and Pumping of Wastewater" is a book, written and edited by professor George Tchobanoglous. I'm currently doing an investigation into a raw sewage pump cavitation-like problem. The...
  3. pumpingwell

    NPSHr (H2O vs Flowing Fluid) and Calculations

    Pumpingwell (Mechanical) March 4, 2003 Kawartha, I'm confused about your reply to dbanks: " ...if you have a reliable pressure reading (including the liquid velocity head) at the pump suction, subtract liquid pressure for NPSHa." How can the 'liquid velocity head' be included in a...

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