Follow the steps below to perform a single-hydrant flow test. Locate the test area by choosing the closest hydrant downstream of the building supply line. This will be used to gather pressure readings. Next, select the subsequent downstream hydrant as the secondary flowing hydrant to obtain your pitot reading.
Mark the hydrant measuring pressure as the residual hydrant. Both static pressure (when flow hydrants are closed) and residual pressure (when flow hydrants are open) are assessed from this hydrant. The residual hydrant should be between the hydrant (s) to be flowed and the large mains that supply water to the area.
NFPA Guidance on Fire Hydrant Testing & How To Do It
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Hydrant number/location map. The flow testing procedure should be conducted, as follows: Position one personnel at the test hydrant, and one at the flow hydrant. Flow hydrant should be located …
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AWWA Field Guide: Hydrant Flow Tests Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher