This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

BPT

Hello all,

I have a simulation model with up an down contour in transmission system so we use break pressure tank to reduce high pressure. The question is, how I use break pressure tank in watergems? Thanks.

  • First let's clarify what you mean by a break pressure tank. It is a tank with a separate inlet pipe from a higher pressure zone with some kind of altitude valve to prevent overflow and an outlet pipe to the lower pressure zone.

    You would set the Property "Has separate fill line" to True. Then you would identify the inlet pipe, specify whether it is top or bottom filled and specify the characteristics of the valve on the fill line.
  • Hi Tom,

    Yeah the BPT is something like that. Thanks Tom, but I have additional question, does up and down elevation influence watergems calculation? Especially about flow and velocity in the pipe? Thanks.
  • I'm not sure what you mean by "up and down elevations". I'll assume you mean the range of water levels in the tank. If so, then it depends on how you are modeling demand. If you are using known demand with patterns, that is what will control flow and velocity in pipes downstream of the tank. If you use pressure dependent demand, then the level will have a minor effect. If you are talking about flow into the tank, the level will have a big influence. When the fill line is open, the flow will be high; when it is closed, there will be no flow.
  • If by "up and down elevations" you're talking about node/pipe elevation in hilly terrain, you may want to check out the below article on air valves. The calculations are based on hydraulic grade, so the elevation of a junction simply determines the pressure. By default if you have a junction at a high elevation representing a hill, you'll simply see a negative pressure. If the real system has an air valve at the top with partially-full flow downstream, you can account for that with an air valve:

    communities.bentley.com/.../2662

    Here are some other related articles:

    communities.bentley.com/.../9454

    communities.bentley.com/.../10830.negative-pressures


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.