Nozzle discharge Q from orifice area, pressure and coefficient of discharge - sizing for portable fire hose and monitor nozzles.
Formula
$$ Q = C_d \cdot A \cdot \sqrt{2 g H} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $A$ | Orifice area | m² | nozzle spec |
| $H$ | Pressure head (10 m = 1 bar) | m | pressure gauge |
| $C_d$ | Discharge coefficient | - | nozzle geometry |
Sources
- NFPA 1964 / SOLAS II-2.