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Valves

If you do not possess skelebrator there is really no way to morph valve nodes into isolation valves. You would have to map the valves as isolation valves in model builder right?

 

But then if I was to map the valves in my system as isolation valves what would be the information I lose as opposed to modeling the valves as different valve types like PRV PSV or even GPV (the ability to be a factor in extended period simulations maybe). In other words what is the difference between using those valve types instead of isolation valve?

 

And then a separate question is. What is the appropriate way to model shut-off valves I assume it would be by using general purpose valves but I’m not sure.

Parents
  • Yes isolation valves are not end nodes like junctions are, so there isn't a direct way to morph a node element into an isolation valve using batch morph function, but it can be done using Skelebrator. 

    How to convert a TCV GPV or PBV to an Isolation Valve using Skelebrator 

    When you are using e.g. GPV, there is headloss curve attached to  a GPV, in case of TCV you will loose values of headloss / discharge coefficient etc. or in case of PRV you would loose PRV settings, however those can be reset based on hydraulic conditions downstream. 

    Also isolation valve is connected to the pipe, it will not split pipes like other valve types, could you please elaborate what is the use of this valve on field, how it is operating there is it isolation valve or some other type? 

    Minor losses for Isolation Valves 

    How does the diameter of an isolation valve effect the calculated results? 

    Below wiki will help you with valve type selection. 

    Valve Type field assumptions and use with a TCV 

    In case of modeling shut-off valve, if you are concerned about opening and closure of valve then it can be modeled as an Isolation Valve element associated with the pipe (and use the open/closed status).

    If you have more details about hydraulic characteristics like a stroke vs. discharge coefficient curve (where stroke would be the "relative closure" in WaterCAD), then it can be modeled as TCV with different options to select under valve type in TCV properties. See above wiki about valve type assumptions and use with A TCV. 

    A GPV will require flow and headloss relationship, so it will depend upon what kind of data you have about this shut-off valve. 

    Regards,

    Sushma Choure

    Bentley Technical Suppport

Reply
  • Yes isolation valves are not end nodes like junctions are, so there isn't a direct way to morph a node element into an isolation valve using batch morph function, but it can be done using Skelebrator. 

    How to convert a TCV GPV or PBV to an Isolation Valve using Skelebrator 

    When you are using e.g. GPV, there is headloss curve attached to  a GPV, in case of TCV you will loose values of headloss / discharge coefficient etc. or in case of PRV you would loose PRV settings, however those can be reset based on hydraulic conditions downstream. 

    Also isolation valve is connected to the pipe, it will not split pipes like other valve types, could you please elaborate what is the use of this valve on field, how it is operating there is it isolation valve or some other type? 

    Minor losses for Isolation Valves 

    How does the diameter of an isolation valve effect the calculated results? 

    Below wiki will help you with valve type selection. 

    Valve Type field assumptions and use with a TCV 

    In case of modeling shut-off valve, if you are concerned about opening and closure of valve then it can be modeled as an Isolation Valve element associated with the pipe (and use the open/closed status).

    If you have more details about hydraulic characteristics like a stroke vs. discharge coefficient curve (where stroke would be the "relative closure" in WaterCAD), then it can be modeled as TCV with different options to select under valve type in TCV properties. See above wiki about valve type assumptions and use with A TCV. 

    A GPV will require flow and headloss relationship, so it will depend upon what kind of data you have about this shut-off valve. 

    Regards,

    Sushma Choure

    Bentley Technical Suppport

Children
  • But again what if you do not have skelebrator in the version of watercad you are using. And also not looking to acquire the skelebartor. You would have to map the valves as isolation valves in model builder right? That would be your only option in that case right?

  • But again what if you do not have skelebrator in the version of watercad you are using. And also not looking to acquire the skelebartor. You would have to map the valves as isolation valves in model builder right? That would be your only option in that case right?

    To understand correctly, you need to morph existing valves as isolation valves? If you cannot use Skelebrator then yes you would have to do this using ModelBuilder.

    However, if you are worried about losing the information associated with the particular valve type (like PRV or TCV) which could be useful / essential for simulation in the future you can follow this workflow;

    - Open the particular valve FlexTable and copy the necessary data from there to a spreadsheet. You can choose the essential information columns and export the FlexTable to a .csv or .shp format.

    - Open the .csv file in a spreadsheet application like MS Excel and use it to build your model via ModelBuilder.

    Let me know if this helps.


    Regards,

    Yashodhan Joshi