• RE: Surge Analysis with Bladder Surge Tank

    Sushma Choure
    Sushma Choure
    Hello Syed, You can compare different scenarios here whether 1 surge mitigation device is enough or 2 are required that will depend upon the results you are getting and your engineering judgement. If one provides the enough protection second one will…
    • 11 months ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Bladder Tank Pressure and Tank Volume

    Scott Kampa
    Scott Kampa
    Hello Syed, The example that you use above is from the hydropneumatic tank modeling reference and is used to calculate the gas volume in the hydropneumatic tank. The values for the parameters mentioned may be dependent on the tank and the overall system…
    • 11 months ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Surge Analysis with Bladder Surge Tank

    Sushma Choure
    Sushma Choure
    Hello Syed, Thank you for uploading model files, is there any reason for selecting to have hydropneumatic tank away from pump station, generally hydropneumatic tanks are placed near the pump stations, just downstream of it. As a trial when placed…
    • 11 months ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Surge Tank Location

    Sushma Choure
    Sushma Choure
    Hello Syed, The placement of surge tank should be generally near the pumps to keep the water column moving upon pump shutdown. We would suggest you first to create 3 different scenarios, one with no protection, second with surge tank near pump and third…
    • 11 months ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Values for pressure wave and time step interval

    Sushma Choure
    Sushma Choure
    Hello Syed, You can either specify the wave speed values in all pipe properties / pipe flex table and keep pressure wave =0 in calculation options or you can specify wave speed global value in calculation options and leave zero in pipe properties. This…
    • over 1 year ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
    • Jesse Dringoli
  • RE: Valve Closure Results Problem

    Sushma Choure
    Sushma Choure
    Hello Syed, Which type valve is it for which you are modeling valve closure, is it TCV or other, please specify. If it is a gravity system still you can model valve closure transient simulation by setting the operating rule for the valve in transient…
    • over 1 year ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Valve Closure Results Problem

    Scott Kampa
    Scott Kampa
    Hello Syed, Using the TCV should work fine. The issue is the length of time you are computing the model. You are currently using "Time Steps" as the Run Duration Type, with a setting of 240 time steps. At the Time Step Interval you are using, this is…
    • over 1 year ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Negative Pressure in my Model

    Tom Walski
    Tom Walski
    You mentioned that you will be serving a hilly area. If the range of elevations is large (difference between highest and lowest customer > about 50 m), it may be necessary to divide the system into multiple pressure zones. There would be a high zone for…
    • over 3 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • RE: Negative Pressure in my Model

    Scott Kampa
    Scott Kampa
    Hello Syed, Negative pressures can occur for a few reasons. They could be related to the elevation of the node, the elevation of the boundary, the head added by a pump, or excessive headlosses in pipes. Reviewing the input and results for some of these…
    • over 3 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum
  • Negative Pressure in my Model

    Syed
    Syed
    Dear All, I have designed a water supply system. In this system there are four pumping stations. (Fixed location). I have assigned my desired flow and head to each pump and demand at every junctions. When I have run my model, It's giving me negative…
    • Answered
    • over 3 years ago
    • OpenFlows | Water Infrastructure
    • OpenFlows | Water Infrastructure Forum