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The flow rate of a hydrant is typically identified by determining the available flow rate when the residual pressure drops to 20 psi....4½-inch discharge outlet: 10 psi \u2013 1,730 gpm. 15 psi \u2013 2,110 gpm. 20 psi \u2013 2,430 gpm.
Fire flow is defined as the flow rate of a water supply, measured at 20 psi (137.9 kPa) residual pressure, that is available for the responding fire department for manual firefighting, typically this is water that is available at the surrounding fire hydrants, but it can be supplied with another approved source such as ...
Fire flow = length X width ÷ 3 This formula is most easily applied if the estimated square footage of the entire structure is used to determine an approximate fire flow for the total structure and is then reduced accordingly for various percentages of fire involvement.
A fire hydrant flow test is performed for a specific area by using three fire hydrants. A pressure gauge is placed on one hydrant to record the static pressure; this is hydrant #1. The remaining two hydrants are opened to allow water to flow out as fast as possible.
The flow testing procedure should be conducted, as follows: Position one personnel at the test hydrant, and one at the flow hydrant. Attach gauge to test hydrant. Open hydrant; record static pressure reading. Record outlet coefficient size of flow hydrant. Attach pitot gauge to flow hydrant.
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Use a pitot gauge to measure the velocity pressure of the stream flowing from the hydrant. While the pitot pressure is being recorded, notify the crew at the test hydrant to take a second pressure reading and record the result.
put the end of the swab into the tube so it's in the liquid and swirl the swab around as directed in the test kit instructions, then close the lid. squeeze the liquid from the tube onto the test strip. check the waiting time in the instructions that came with your test kit.
\u200bFire Flow is formally defined as the "flow rate of a water supply, measured at 20 psi (138 kPa), that is available for fire fighting." ( IFC 200-2018 Appendix B Section B102) Fire flow is used to determine the quality of a water supply to an area.
Remove the nozzle cap of the pressure hydrant and add the pressure gauge to its outlet. Open its valve completely and gather static pressure reading (Water should not be flowing). Then, open the flowing hydrant's valve. Always be cautious of nearby obstacles and traffic.
According to this standard, the proper way to test a hydrant and water main is to put a cap gauge on the test hydrant and take a static reading. Then proceed down stream to the next flow hydrant and back up stream to the closest flow hydrant and flow both at the same time.

universal water flow test summary sheet