1. What is a Firefighter Friction Loss Calculator?

Definition: This calculator estimates the friction loss in fire hoses based on the coefficient, flow rate, and hose length.

Purpose: It helps firefighters determine the pressure loss in hose lines to ensure adequate water delivery at the nozzle.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( FL \) — Friction loss (psi)
• \( C \) — Hose coefficient (depends on hose type)
• \( Q \) — Flow rate (gallons per minute)
• \( L \) — Hose length (in 100 ft units)

Explanation: Friction loss increases with the square of the flow rate and linearly with hose length and coefficient.

3. Importance of Friction Loss Calculation

Details: Proper friction loss estimation ensures firefighters can deliver required water flow at adequate pressure for effective firefighting.

4. Using the Calculator

Tips: Enter the hose coefficient (see reference table), flow rate in gpm, and hose length in 100 ft units. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical hose coefficients?
A: Common values: 10 for 1.75" hose, 2 for 2.5" hose, 0.8 for 3" hose, and 0.2 for 5" hose.

Q2: Why is friction loss important?
A: It determines how much pump pressure is needed to overcome hose resistance and deliver required nozzle pressure.

Q3: Does this include nozzle pressure?
A: No, total pump pressure = friction loss + nozzle pressure + elevation pressure.

Q4: How does hose diameter affect friction loss?
A: Larger diameter hoses have much lower friction loss for the same flow rate.

Q5: What about multiple hose lines?
A: For parallel lines of same length/type, divide flow by number of lines before calculating.