In other words, if your pitot pressure is 28 psi and your orifice size is 4, your theoretical discharge according to the table GPM. If the coefficient of your hydrant outlet is 0.9, x 0.9 finds the actual rate of flow: 2,273.4 GPM.
GPM or gallons per minute is a unit of flow rate, i.e., it specifies how fast a liquid (for example, water) moves through a pipe or pump. One US gallon per minute is approximately equal to 6.309 × 1 0 − 5 m 3 / s 6.309 × 10^{-5}\ \rm{m^3/s} 6.309 × 1 0 − 5 m 3 /s .
How to Calculate Gallons Per Minute (GPM) – FireHoseDirect
The formula to find GPM is 60 divided by the seconds it takes to fill a one gallon container (60 / seconds = GPM). Example: The one gallon container fills in 5 seconds. 60 / 5 = 12 GPM. (60 divided by 5 equals 12 gallons per minute.) If you have a high flow you may need to use a larger container to get an accurate reading.
My goal is to get the water moving in the 6 inch transmission mains at 5 feet per second. If one foot of 6 inch pipe has 1.47 gallons of water in it, at 5 feet per second, that’s 7.35 gallons per second or 441 gallons per minute. I’m hoping to use the pitot tube to help me calculate the gallons per minute being discharged.
People Also Ask how to figure gallons per minute from a fire hydrant
How do you calculate the discharge rate from a hydrant?
In other words, if your pitot pressure is 28 psi and your orifice size is 4, your theoretical discharge according to the table is 2,526 GPM. If the coefficient of your hydrant outlet is 0.9, multiplying 2,526 x 0.9 finds the actual rate of flow: 2,273.4 GPM.
How many gallons per minute is a 6 inch pipe?
If one foot of 6 inch pipe has 1.47 gallons of water in it, at 5 feet per second, that’s 7.35 gallons per second or 441 gallons per minute. I’m hoping to use the pitot tube to help me calculate the gallons per minute being discharged.
What is the GPM of a fire hydrant?
For instance, red hydrants typically have a rated capacity of less than 500 GPM and light blue hydrants have a rated capacity of more than 1,500 GPM. With so much at stake, it’s critical for hydrants to perform as expected during a fire. A handheld pitot gauge is the quickest, simplest method for measuring straight-tip and hydrant-flow GPM.
What is one US gallon per minute in m3/s?
One US gallon per minute is approximately equal to 6.309 × 10 -5 m 3 /s. Since PSI is a measure of pressure and GPM is a measure of flow rate, we can not directly convert one into another.
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How to Calculate Gallons Per Minute – Barrow Co. Emergency Services Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher