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Fire Hydrant Flow Testing

Fire Hydrant Flow Testing

Fire Hydrant Flow Testing

(OP)
Why must a pitot reading be obtained at the flowing hydrant? A static pressure and residual pressure could be obtained for the flowing hydrant and the differential be used to estimate flow using Bernoulli's. What am I missing?
Sorry if this has been addressed before I did search the forums.

RE: Fire Hydrant Flow Testing

You may wish to refer also to AWWA MOP M17, "Installation, Field Testing,and Maintenance of Fire Hydrants" for additional information/requirements.

RE: Fire Hydrant Flow Testing

jmenscu,

You're not missing anything. You can do what you suggest but the pitot reading is considered better practice. Besides, if you do all three readings you will have a check on the results because you can then calculate the flow two ways.

good luck

RE: Fire Hydrant Flow Testing

(OP)
Thank you; Sam74, rconner and RWF7437. I appreciate the help and understand the desire to have duplicate data. I wanted to make sure I wasn't missing any fundamental assumptions in the hydraulics.

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