Slowly release the main valve until air is vented. Take a static pressure reading. Measure the inside diameter of the outlet nozzle or hydrant outlet where flow occurs. A hydrant’s inside diameter is usually 4”. Field personnel should slowly open each fire hydrant, one at a time, to avoid pressure surges.
4.13.1 Public fire hydrants should be flow tested every 5 years to verify the capacity and marking of the hydrant. The 2019 edition of NFPA 291: Recommended Practice for Fire Flow Testing and Marking of Hydrants (4.1.3) recommends that fire hydrants should maintain a residual pressure of 20 psi (pounds per square inch), or 1.4 bar, for …
NFPA Guidance on Fire Hydrant Testing & How To Do It
Fire Hydrant Testing Frequency. British Standards require Fire hydrants are tested and serviced once a year. This is to ensure the water pressure and flow rate are adequate and a Certificate of Conformity can be issued. Property owners and managers often ask ‘ How often should a fire hydrant be tested and why?
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Hydrant Flow Testing Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher