Malaysia
Malaysia
Singapore
Abu Dhabi - UAE
Indonesia
UK
Brunei
India
+603 2380 4560 SynergenOG Sdn Bhd
+65 861 84 148 Synergen Oil & Gas Pte. Ltd
+971 56 232 5400 SynergenOG
+62 2150 897100 PT. SynergenOG Indonesia
+44 1224 618460 Synergen Oil & Gas UK Limited
+673 233 9270 SynergenOG (B) Sdn. Bhd.
+91 9995457949 Synergen Energy LLP

How do you calculate fire hydrant flow?

Q = 29.84(cd)(d^2)*(sqrt(p))
29.84 is a constant derived from physical laws relating to water velocity, pressure, and conversion factors. In short, this number keeps the answer in GPM.
cd = the coefficient of discharge, which represents friction loss.
d = the actual inside diameter of the hydrant orifice in inches.
p = the pressure in PSI read at the orifice by the pitot gauge. Because this formula takes the square root of p—rather than p itself—large increases in PSI will have a fairly small impact on the final GPM.
Q = a number used to represent the result or discharge in GPM

About the author

Happy to Help !