Water Supplies for Sprinkler Systems

The most common and least expensive water source for sprinkler systems is the public water-supply system. If the public water supply is the only source of water for the sprinkler system, it must be reliable and maintain adequate pressure and volume at all times.

To establish the capabilities of water-supply systems, ISO field representatives or other designated officials can conduct hydrant flow tests. The objective of the flow test is to determine the quantity in gallons per minute (gpm) and pressure available at a specific location. ISO can conduct the tests during public protection gradings, or the local fire department or water company can conduct the tests. The testing process can identify closed valves and changes in the carrying capacity of mains.

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A fire hydrant connects to the public water-supply system

Conducting a hydrant flow test