CONVENTIONAL HYDRANT FLUSHING

TESTING APPLICATIONS: CONVENTIONAL HYDRANT FLUSHING

Conventional flushing is the practice of simply opening one or more fire hydrants and allowing the water to run until sediment or poor quality water is removed. Conventional flushing differs from unidirectional flushing in that no valves are closed to increase the velocity of water through the mains, making it less effective at cleaning the mains. Hydrant flushing differs from Hydrant Flow Testing because conventional flushing does not require any flow-rate measurements and does not measure water supply.  Hydrant flushing is part of the hydrant’s annual maintenance procedure described in NFPA 25 and AWWA M17.

HOW OFTEN DO I FLUSH HYDRANTS?

NFPA 25, requires all hydrants be fully opened and given an inspection on an annual basis. Flow and pressure readings are not required during this annual inspection.

WHERE DO I FIND MORE INFORMATION ON HYDRANT FLUSHING?

  • NFPA 25, – Private Fire Service Mains
  • AWWA M17 – Fire Hydrant Maintenance

WHAT EQUIPMENT DO I NEED?

  • LITTLE HOSE MONSTER

    Its benefits are its light weight (only 6 pounds) and low price. If using this option, a Flushing Nozzle (FN) is also needed.

  • 2 ½” Hose Monster Flusher

    This model is the same as a regular 2 ½” Hose Monster except that it does not have a pitot installed. A pitot kit can always be purchased and installed later if you decide to take pressure readings.

  • BIGBOY HOSE MONSTER

    For flowing from pumper port. It is larger and flows more water.

HYDRANT FLUSHING PROCEDURE:

  • 1. Remove one cap from hydrant. Tighten all other caps.

    2. Set the Hose Monster in an appropriate location for flowing water.

    3. Attach hydrant gate valve on the hydrant, then attach the hose and Hose Monster.

    4. Slowly open the hydrant by rotating the stem nut on top using the hydrant wrench. Open hydrant gate valve to begin flowing water.

    5. Once sufficient water is discharged, slowly close hydrant gate valve. Slowly close hydrant. Replace and tighten caps. Remove Hose Monster. Roll up hose to the Hose Monster. If hydrant is dry barrel type, note that water drains properly from the hydrant.

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