With minimal pressure, under ideal circumstances, you should be able to get about 1000 gallons per minute out of a hydrant fed by a 4 inch line. Most places in my town actually have about 100 psi of pressure in the water lines, so in theory you could actually get close gallons per minute out of that hydrant.
How much water comes out of a fire hydrant per minute? gallons per minute. What is static pressure in fire hydrants? Static pressure is the pressure at the individual hydrant before water is flowing, and residual pressure is the pressure while water is flowing. The available flow rate from a hydrant is determined using residual pressure, but static pressure …
How do you get water out of a fire hydrant? – Fire safety
Here’s the color breakdown a blue topped fire hydrant will have a water pressure of more than 1500 gallons per minute. Green is 1000-1499 gallons per minute, orange is 500-999 gallons per minute, and red is less than 500 gallons per minute.
With minimal pressure, under ideal circumstances, you should be able to get about 1000 gallons per minute out of a hydrant fed by a 4 inch line. Most places in my town actually have about 100 psi of pressure in the water lines, so in theory you could actually get close gallons per minute out of that hydrant.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher