Water pressure in fire hydrants typically ranges from 20 PSI to 80 PSI (138 to 552 kPa). However, this pressure range can vary depending on the municipality’s water system and local fire codes.

2020年5月6日 · My research indicates that for either major document it's 1500 gpm at 20-psi per fire hydrant within 250 feet of the building's footprint. There is a table that allows the fire flow per hydrant to be reduced on distance from the building.

2020年11月10日 · The 2022 edition of NFPA 291: Recommended Practice for Fire Flow Testing and Marking of Hydrants (4.2.2) recommends that fire hydrants should maintain a residual pressure of 20 psi (pounds per square inch), or 1.4 bar, for effective firefighting, as well as to prevent backflow that could contaminate the public water supply.

2022年8月1日 · The water sent to the fire hydrant networks required pressure reduction. The top pressure number in the question, 250psi, I believe is the rated pressure limit for many standard hydrants. Reducing to 200 or below with a goal of 175psi is something that is manageable.

2017年11月14日 · Fire hydrants are flow-tested at a residual pressure of 20 psi; therefore, firefighters should understand the typical flow rates of fire hydrants at that pressure.

3.1.1 A uniform rating of hydrants is achieved by measuring the flow rate of water at a specified residual pressure. A residual pressure of 1.4 bar (20 psi) is generally recommended to be retained at hydrants when delivering fire flows.

2019年8月1日 · In theory, pitot gauges make it simple to measure the flow of fire hydrants and convert readings in pounds per square inch (PSI) to gallons per minute (GPM), enabling inspectors to quickly uncover reduced flow rates.

2020年8月28日 · As inference from NFPA 13, Hydrant flow/Hose stream flow varies from 250 gpm to 750 gpm but there is no there is no single criteria. Similarly for residual pressure, it's depend and also varies from 20 psi (1.4 bar) to 100 psi being the max.

2023年12月22日 · It is recommended that fire hydrants should maintain a residual pressure of 20 psi (pounds per square inch), or 1.4 bar, for effective firefighting, as well as to prevent backflow that could contaminate the public water supply.

2023年7月30日 · The recommended minimum pressure for water coming from a fire hydrant is typically around 20 PSI. What is the NFPA requirement for fire flow? NFPA provides guidelines for calculating the required fire flow based on the occupancy type and fire hazard.