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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.
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.
0:00 3:42 Converting Hydrant Flow Test Results to GPM - YouTube YouTube Start of suggested clip End of suggested clip Times the diameter squared of your open orifice times your square root of your flow pressure whichMoreTimes the diameter squared of your open orifice times your square root of your flow pressure which is going to be determined from your pitot gauge.
In NSW, this is currently 150kPa for each fire hydrant required to flow at not less than 10 l/s. In all other states and territories this value is 200 kPa.
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\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.
CLASSHydrants that on individual test usually have a flow capacity of:CLASS AA1,500 gpm or greaterCLASS A1,000 gpm or greaterCLASS B500 to 1,000 gpmCLASS C<500 gpm
FLOW DURATION (hours) For SI: 1 gallon per minute = 3.785 L/m. The reduced fire-flow shall be not less than 1,000 gallons per minute. The reduced fire-flow shall be not less than 1,500 gallons per minute.

fire hydrant calculation formula