• [OpenFlows HAMMER] - Pumps in parallel failure scenarios

    Hi I want to analyze failure scenarios for 2 pumps in parallel in HAMMER. Therefore I´d like to ask how could I set the following scenarios: 1-) Sudden and simultaneous pumps Start-up (sudden change in flow). 2-) Sudden and simultaneous pumps…
  • Why do check valves open and close multiple times 10 seconds after the pump shuts off?

    This system is modeled to have three intake pipes to three pumps (modeled as a single pump curve) through three check valves into a single force main. Even though a pressure threshold of 100 psi has been added to the check valve properties, the check…
  • Re: Hydropneumatic Tank Modeling - Need Help

    I think your tank is just too small. You have a (very big!) flow of 9 m^3/s in the pipeline, and only a 5 m^3 hydropneumatic tank. At that rate the tank completely drains in about half a second and has a negligible effect on the pump-stop transients…
  • Re: Hammer

    Also, it seems like this are quite large pumps so under normal conditions you probably control their shut down over a longer period (if not, you might want to consider doing this). If the pumps are normally controlled to shut down slowly over…