Design & Layout of Water, Wastewater and Residuals Pumping System

Example – Troubleshooting Problems with an Existing Facility



  • Premature pump wear and of interior of pump casing
  • Pump suction piping arrangement not in accordance with good practice or in accordance with ANSI/HI 9.6.6

Existing Suction Piping – Eccentric Reducer at Pump Suction Nozzle


  • Move eccentric reducer from pump suction nozzle to upstream location at least as much as HI 9.6.6 recommends
  • Conduct physical modeling to confirm
  • Model recommended addition of flow straightening grid due to unstable flow patterns in suction piping due to multiple bends and plug valve with rectangular reduced area port opening