Fire Hydrant Flow Test Formula

52 fire hydrant flow and pressure tests fire hydrants are tested to determine flow and pressure.

Fire hydrant flow test formula. The calculation offers more useful information than the test flow by itself and is used by insurance underwriters. Open flow hydrant fully c. Take readings simultaneously after pressure at the residual hydrant has stabilized d. Static pressure is taken on a residual hydrant with other hydrants closed.

Secondary psi before flowing. The rated capacity calculation is useful in determining the total water supply at a given point in the hydrant or water main. The hydrant flow test calculator measures the rated capacity at 20 psi of a fire hydrant. Fire hydrant flow test results calculator.

Qr qf x hr 0 54 hf 0 54 qr flow rate predicted at the desired residual pressure in gpm. Computes the flow rate available at a specified residual pressure a k a. Measure record i d. Residual testing requires at least 2 hydrants.

Secondary psi while flowing. Fire hydrants are tested regularly to ensure that they are capable of providing water at an acceptable pressure and flow rate foe public health and firefighting operations. Projected available hydrant flow. Fire hydrant flow test determine the flow rate and pressure in any location through out a water company s or water authority s underground water distribution system.

Then hydrant 1 is opened so that water discharges from it. A fire hydrant flow test is a process of flowing water out of at least one fire hydrant while obtaining the required pressures static residual and pitot needed to calculate the amount of water in gallons per minute gpm that the water system is capable of providing between the tested hydrants. Print this page send by email. Fire hydrant flow test analysis equation awwa 2006 p.

This hydrant is flowing. The hydrant flow test calculator measures the rated capacity at 20 psi of a fire hydrant. Determine outlet nozzle coefficient 5. The calculation offers more useful information than the test flow by itself and is used by insurance underwriters.

Then an adjacent flow hydrant is opened and flow rates are measured at the same time the residual pressure is recorded on the residual. Referring to the figure prior to flowing hydrant 1 pressure is measured at hydrant 2. The example below enables you to find the predicted flow rate at 20 psi residual pressure. This is the static pressure p s.

Use this when fire flow testing hydrants. The main can be expected to flow about. Conduct the flow test a. Gpm from the test outlet.

Hydrant flow test procedures 4. One person at residual hydrant one at the flow hydrant b.