Fireflow Part 1: Basics

Fireflows are an integral part of the Hydraulic modeling process and provide a means to calibrate your model.  Fireflow represents the amount of water available in a network for fire protection purposes apart from the amount of water used in the network demand.  You may use the InfoWater Fireflow module to analyze your existing hydrants or provide recommendations for future build-outs.

In InfoWater, there are three inputs that can be applied while conducting a standard Fireflow.

1 – The Fireflow demand assigned to the hydrant.  This value is used to calculate the residual pressure at the hydrant  when the fireflow demand and static demand are pulled from the hydrant.

2 – The Residual Pressure imposed on the Hydrant.  The Residual Pressure is the minimum allowed pressure at the hydrant during a fire event.  This value is used to determine the Available Flow at Hydrant.

3 – The Maximum Velocity Constraint can be assigned in combination with the Residual Pressure constraint.  The Maximum Velocity is the pipe velocity limit used to determine if there is a pipe at risk of high velocity (critical pipe) and to iterate the Available Flow at Hydrant in concurrence with the Residual Pressure constraint. As a result the Available Flow at Hydrant is reported as the most conservative value determined by these two.

How are these three inputs entered?

1 – The Fireflow Demand can be assigned individually at the junction representing the hydrant, globally using the InfoWater group editor, and via the Fireflow Demand Table which is accessible through the DB editor or through the Fireflow tab found in the Run Manager dialog.

2 – The Residual Pressure can be assigned globally in the Fireflow tab found in the Run Manger dialog, or specific to the hydrant via the Fireflow Demand table.

3 – The Maximum Velocity can be assigned globally in the Fireflow tab found in the Run Manger dialog.

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