• inserimento air valve dopo evento transitorio arresto pompa (ho bisogno di aiuto)

    Giovanni Stabile
    Giovanni Stabile
    buongiorno, dopo tante domande siamo quasi arrivati alla fine del problema. Dopo aver calcolato un'analisi transitoria di arresto di una pompa con numero di giri variabile ho problemi relativi alla cavitazione e quindi ho inserito dove ho questi problemi…
    • over 1 year ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • evento transitorio spegnimento pompa velocità variabile

    Giovanni Stabile
    Giovanni Stabile
    buonasera, ho riscontrato due errori in questa simulazione: 1) problema cavitazione 2) analizzando i risultati dell'analisi ho notato che le portate (flow) delle tubazioni a valle della pompa spenta non tendono mai a 0 ho pensato: per risolvere…
    • over 1 year ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • Re: Check Valve

    Jesse Dringoli
    Jesse Dringoli
    Cesar, You can still have reverse flow through a pump even if the impeller is not spinning (reverse spin disallowed in the transient tab of the pump definition.) So, it is different from the check valve option, which would actually close the pump…
    • over 14 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • How to model pump trip and restart?

    Roadie
    Roadie
    In Hammer V8i is there any way to model a pump trip/stop followed by a start? thanks.
    • over 11 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • Hammer Analysis in Raw Water Transmission System

    bwhite
    bwhite
    I'm trying to evaluate the need for surge protection at new well locations in a raw water transmission system. I have a network of 6 wells all pumping to the water treatment plant. I'm new to Water Hammer and surge analysis so I'm just looking for some…
    • over 10 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • Re: Modeling a 1.5 second valve closure at Airplane Fueling Nozzle?

    Jesse Dringoli
    Jesse Dringoli
    Hello, The pumps are going to operate based on the system conditions (where the pump curve intersects the system head curve.) So, you'll need to "model what you've got" to get the right pump operating point. Meaning, if there aren't FCVs in reality…
    • over 13 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • Re: Hammer calc error

    Jesse Dringoli
    Jesse Dringoli
    Velibor, You need to enter the pump inertia. This is needed for a shutdown event, so HAMMER can correctly compute how the pump spins down. It is not needed with a constant speed pump because the pump isn't changing speed. Regards, …
    • over 14 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum