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Surge Anticipator Valve (SAV): No discharge flow reported after minimum threshold pressure reached.

Michael Assante
Offline

Hey,

I have an SAV in my transient model, that, when a minimum pressure threshold is reached, reports no flow through it. I have set up a tee off of the main discharge header to put the SAV off of. Does anyone know why this is, or has anyone experienced this?

 

Thanks,

 

Mike

  • 0 Offline
    Hello Mike,

    Are you getting a user notification that says that the pressure threshold was reached and the amount of flow produced, similar to the messages below?

    "Threshold pressure reached at time step 271. Please note that the SAV element does not model air inflow."
    "The total discharge through surge anticipator valve and/or surge relief valve = 0.948 m³."

    If so, double-check the flow units. Perhaps the flow is relatively small for the units that are used. Another thing you can to is look at a time history graph of pressure and flow for the SAV, which should show the pressure over time along with the flow during the time period.

    A quick check of a sample model shows that this is working as expected. The following TechNote has some information on surge valves in general: communities.bentley.com/.../modeling-reference-_2D00_-surge-valves

    If you are getting messages about the threshold pressure being reached, but the time history graph shows no flow, I will likely need to see copy of the model to look into this further. There are two options for sharing your model files on Communities. If you would like the files to be visible to other members, compress the files into a zip file and upload them as an attachment using the ‘Advanced Reply editor’ before posting. If your data is confidential, you can follow the instructions in the link below to send it to us via Bentley Sharefile. Files uploaded to Sharefile can only be viewed by Bentley.

    communities.bentley.com/.../7079.be-communities-secure-file-upload

    If you upload the model to Sharefile, please post here with the name of the file so that we know it is available.

    Regards,
    Scott
  • 0 Offline in reply to Scott Kampa
    Hey Scott, yes, I get a message saying the pressure threshold has been reached. This is also confirmed by looking at the minimum pressure at the SAV. When plotting flow vs. time, no flow is registered.

    However, when I run the SAV to operate on 'Time' rather than 'Pressure Threshold' and run the simulation, I get flow through the SAV. But it appears that the valve closes quickly (causing unreasonable pressure spike) after the valve has stayed opened for the identified time.

    If you think the best thing to do is for me to upload file, I will do so.

    Thanks for your help,

    Mike
  • 0 Offline in reply to Michael Assante
    Hello Mike,

    Yes, please upload the model files. The steps to do so can be found in the previous post. It will be easier to troubleshoot the issue with the model file.

    Regards,
    Scott
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