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Hydrant testing as a boundary condition

I would like to know if we could use two independent fire hydrant test (not performed at the same time) results run at two nearby locations as boundary condition to run a fire flow analysis in water model?

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  • Shyam,

    Are these two hydrant flow tests from two separate sources? Meaning, are you wanting to use them to model two separate connections to an existing system? If so, the following article explains the reasons why this would not provide accurate results: Modeling a Connection to an Existing System (see "Assumptions and Limitations" section).

    If the tests are done at the same time, then it would account for the likely further drop in connection pressure as result of both outflows occurring at the same time.

    You could consider a conservative assumption with fixed reservoirs, but it always always best to model at least a skeletonized version of the system back to a single source.

    Note that a "fire flow analysis" refers to something separate from the modeling of connection points. If you are not modeling the entire system, you can use the pump+reservoir approach to simulate a connection point based on nearby flow test data. If you need to check for adequate pressure during fires, you could configured automated fire flow in that model. See: How does the Automated Fire Flow analysis work?


    Regards,

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

Reply
  • Shyam,

    Are these two hydrant flow tests from two separate sources? Meaning, are you wanting to use them to model two separate connections to an existing system? If so, the following article explains the reasons why this would not provide accurate results: Modeling a Connection to an Existing System (see "Assumptions and Limitations" section).

    If the tests are done at the same time, then it would account for the likely further drop in connection pressure as result of both outflows occurring at the same time.

    You could consider a conservative assumption with fixed reservoirs, but it always always best to model at least a skeletonized version of the system back to a single source.

    Note that a "fire flow analysis" refers to something separate from the modeling of connection points. If you are not modeling the entire system, you can use the pump+reservoir approach to simulate a connection point based on nearby flow test data. If you need to check for adequate pressure during fires, you could configured automated fire flow in that model. See: How does the Automated Fire Flow analysis work?


    Regards,

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

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