• Modelling flow through shut-off pumps

    I'm using WaterGEMS to model pumping station with 3 pump sets, each with 4 pumps - 1 master + 3 lag pumps. Pumping station is not operating during night hours and water is flowing through shut-off pumps (pressure is approx. 350 kPa on suction side). It…
  • Pumps performance

    Good evening i have problem with the results of the network's pressure and flow when the pumps in the shutdown in the EPS mode the graphs of the junction's pressure shows unreasonable results so i need to know the correct way of modeling a water…
  • Why isn't my tank refilling?

    Hi, I am having trouble with my tank filling back up after it has emptied. I am modeling a system that is already in place. I have errors that say "Disconnected demand nodes detected" and "System disconnected because of pipe." I read an earlier post…
  • Comparing pressures recorded in the field with HAMMER model for pump shutdown - major differences between the two

    Hi there, I'm a uni student doing a research project on water hammer and have recorded pressures in the field on a pipeline for instant pump shutdown and am comparing them to the outputs I get from HAMMER. I'm struggling to get field and HAMMER outputs…
  • Pump Trip - Correct method to model

    Hello, For a Fire Pump (Diesel) trip that is required to maintain a pressure of 700kPa at the top floor, I undertook analysis for sudden stop and 10sec controlled stop in 4 different ways - with D2A, Pump + TCV, Pump only (though pump speed stops, flow…
  • Hammer - Issue with results from valve closure on pumping system

    Hi, We have modelled a transient scenario, where a variable speed pump is operating at a fixed head, and 12 downstream isolation valves simultaneously closing linearly over 60 seconds, reducing the flow by 95% (one branch remains open passing 5% of…