Fire Hose Friction Loss Calculator: Critical for Pump Operations
Used by fire departments worldwide, our fire hose friction loss calculator ensures adequate pressure at the nozzle — from rural brigades to urban high-rises.
"Aquam contra ignem" — Water against fire.
How the Fire Hose Friction Loss Calculator Works
Standard NFPA formula:
FL = C × Q² × L / 100
FL = friction loss (PSI), C = coefficient, Q = flow (hundreds GPM), L = length (100s ft)
FL = friction loss (PSI), C = coefficient, Q = flow (hundreds GPM), L = length (100s ft)
Fire Hose Friction Loss Calculator: Four Operational Modes
Basic Loss Mode
Quick single-line calculation in our fire hose friction loss calculator.
Full Layout Mode
Includes appliances and nozzle pressure.
Multiple Lines Mode
Total pump pressure for parallel lines.
Elevation + Loss Mode
Complete TPL with head pressure.
Friction Loss Fire Hose Calculator: Standard Coefficients
| Diameter | C Factor | Example @ 250 GPM/100ft |
|---|---|---|
| 1.75" | 15.5 | 97 PSI |
| 2.5" | 2.0 | 12.5 PSI |
| 3" | 0.8 | 5 PSI |
| 5" | 0.08 | 0.5 PSI |
Friction Loss Fire Hose Calculator: Appliance Losses
- Wye/Gated Wye: +15 PSI
- Master Stream: +25 PSI
- Standpipe (per 5 floors): +10 PSI
- Elevation: 0.434 PSI per foot
Pro Tips for Using the Fire Hose Friction Loss Calculator
- Round up flow to nearest 50 GPM
- Add 10% safety margin to pump pressure
- Use largest supply line possible
- Pre-plan high-rise with standpipe charts
- Verify with gauge at nozzle
Deliver Water, Save Lives
From Tokyo to Toronto fire stations, our fire hose friction loss calculator is mission-critical.
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