Fire Hydrant Flow Test Formula

Then an adjacent flow hydrant is opened and flow rates are measured at the same time the residual pressure is recorded on the residual.

Fire hydrant flow test formula. Measure record i d. The rated capacity calculation is useful in determining the total water supply at a given point in the hydrant or water main. 52 fire hydrant flow and pressure tests fire hydrants are tested to determine flow and pressure. Computes the flow rate available at a specified residual pressure a k a.

Take readings simultaneously after pressure at the residual hydrant has stabilized d. This is the static pressure p s. Residual testing requires at least 2 hydrants. Qr qf x hr 0 54 hf 0 54 qr flow rate predicted at the desired residual pressure in gpm.

Determine outlet nozzle coefficient 5. Fire hydrant flow test results calculator. 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. 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.

Conduct the flow test a. The calculation offers more useful information than the test flow by itself and is used by insurance underwriters. The calculation offers more useful information than the test flow by itself and is used by insurance underwriters. Home information tools knowledgebase fire hydrant flow test results calculator.

This hydrant is flowing. Static pressure is taken on a residual hydrant with other hydrants closed. 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. The hydrant flow test calculator measures the rated capacity at 20 psi of a fire hydrant.

Secondary psi while flowing. Then hydrant 1 is opened so that water discharges from it. The example below enables you to find the predicted flow rate at 20 psi residual pressure. Print this page send by email.

The rated capacity calculation is useful in determining the total water supply at a given point in the hydrant or water main. Gpm from the test outlet. Water main pressures are recorded by conducting a residual fire flow test per nfpa 291. One person at residual hydrant one at the flow hydrant b.

Use this when fire flow testing hydrants. Secondary psi before flowing. Fire hydrant flow test analysis equation awwa 2006 p. The hydrant flow test calculator measures the rated capacity at 20 psi of a fire hydrant.

Referring to the figure prior to flowing hydrant 1 pressure is measured at hydrant 2. Hydrant flow test procedures 4.