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. Remove the nozzle cap on the pressure hydrant and attach a pressure gauge to the outlet.
1. Determine Baseline Fire Flow The first step in this overall determination of water supply to a site is to determine the required fire flow. Using the IFC Method, Appendix B has a reference table that stipulates a minimum fire flow and flow duration based upon building size and construction type (2000-2012 Table -2018 Table B105.1(2)). 2.
How to Determine Fire Flow (IFC Method) – MeyerFire
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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.
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Hydrant Flow Testing Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher