Design & Layout of Water, Wastewater and Residuals Pumping System

Example – Troubleshooting Problems with an Existing Facility

CASE STUDY #1

Problem:

  • 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-1

Existing Suction Piping – Eccentric Reducer at Pump Suction Nozzle

Existing-Suction-Piping-Eccentric-Reducer-at-Pump-Suction-Nozzle-2
Existing-Suction-Piping-Eccentric-Reducer-at-Pump-Suction-Nozzle-3

Solution:

  • 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
flow-straightening-grid