Fire Hydrant Flow Test

Then hydrant 1 is opened so that water discharges from it.

Fire hydrant flow test.

Secondary psi before flowing. Nfpa 291 provides guidance on fire flow tests and marking of hydrants in order to determine and indicate the relative available fire service water supply from hydrants and to identify possible deficiencies which could be corrected to ensure adequate fire flows as needed. This hydrant is flowing. The hydrant flow test calculator measures the rated capacity at 20 psi of a fire hydrant.

Hydrant flow tests are conducted to determine water availability in planning for firefighting activities fire sprinkler systems or domestic water demand. Fire flows can cause damage. The calculation offers more useful information than the test flow by itself and is used by insurance underwriters. 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 tests are also useful in determining the general condition of the water distribution system by detecting closed valves or wall deposits. The rated capacity calculation is useful in determining the total water supply at a given point in the hydrant or water main. 4 5 care should be taken to avoid causing nuisance during and after the tests. Gpm from the test outlet.

The information derived from this test is used by the fire service to plan for fighting fires. The hydrant capacity fire flow test evaluates the water supply available from the hydrant. Fire hydrant flow test analysis equation awwa 2006 p. Flow rates from all hydrants open during the flow test are recorded and totalled to give the rating fire flow.

The main can be expected to flow about. Projected available hydrant flow. This test uses a single hydrant as both the residual. Referring to the figure prior to flowing hydrant 1 pressure is measured at hydrant 2.

This is the static pressure p s. Always remember to flow test and inspect fire hydrants annually to ensure the operation of the hydrants in your system. If all hydrants in a system are tested partially closed valves and other obstructions will become known. There are multiple reasons why a flow test could need to be performed below is a list of several of these reasons.

In general fire flow tests are conducted on fire hydrants to determine the water availability. All residual flow tests should include static residual and flow pressures as well as a 50 point inspection of each fire hydrant tested. 52 fire hydrant flow and pressure tests fire hydrants are tested to determine flow and pressure. Are opened so that the residual pressure at the test hydrant drops to the rating pressure.

Secondary psi while flowing.