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D2A Element for Pipe Breakage


I am modeling a pipe breakage event for a Fire Fighting Water Network using a "Discharge to Atmosphere" element in Bentley Hammer.

Can anyone suggest what values should be used for Initial Flow (Typical) and Initial Pressure Drop (Typical) for a 300 mm dia pipe.

Is it correct that Hammer will compute an "emitter coeff" based on these inputs and then use that emitter coeff and pressure available at the D2A element to calculate flow through D2A?

I have already used the flow and pressure values at the breakage point as computed in the steady state as the typical initial flow and pressure drop values, but I get the same values as results from Transient calculation.

Can anyone suggest a correct method to model a pipe breakage using D2A as pressure dependent demand?

Thanks in advance.

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