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### Fire Sprinkler Discharge Calculator (simplified)

Fluids Flow Design and Engineering

Fire Sprinkler Discharge Calculator (simplified)

This calculator determines the typical discharge vs flow rate of a sprinkler head

Preview: Fire Sprinkler Discharge Calculations

Eq.1

Q = n · [ K · P^{1/2} ]

Where

Q = flow (gpm)

K = measure of the ease of getting water out of the orifice, related to size and shape of the orifice in units of gpm per (psi)^{1/2}

P = pressure (psi)

n = number of sprinkler heads (identical at same pressure)

Sprinkler K Factors (typical)

Orifice Size |
Name |
K Factor |

1/2" |
Standard |
5.6 |

17/32" |
Large |
8.0 |

5/8" |
Estra Large |
11.2 |

Reference:

NFPA Standard 291, Recommended Practice for Fire Flow Testing and Marking of Hydrants.

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