1. What is a Fire Friction Loss Calculator?

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

Purpose: It helps firefighters and fire protection engineers determine the pressure loss in hose lines to ensure adequate water supply.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Loss} \) — Friction loss (psi)
• \( C \) — Hose coefficient (dimensionless)
• \( Q \) — Flow rate (gallons per minute)
• \( L \) — Hose length (feet)

Explanation: The formula calculates how much pressure is lost due to friction as water flows through the hose.

3. Importance of Friction Loss Calculation

Details: Accurate friction loss calculation ensures proper pump pressure settings to deliver required flow at the nozzle.

4. Using the Calculator

Tips: Enter the hose coefficient (typically 10-15 for standard hoses), flow rate in gpm, and hose length in feet. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical coefficient values?
A: Common values are 10 for 1.75" hose, 15 for 1.5" hose, and 2 for 2.5" hose.

Q2: Why is flow rate squared in the formula?
A: Friction loss increases exponentially with flow rate, not linearly.

Q3: Does this include elevation changes?
A: No, this only calculates friction loss. Elevation changes require additional calculations.

Q4: How does hose age affect friction loss?
A: Older hoses may have higher coefficients due to internal wear and deposits.

Q5: What about multiple hose lengths?
A: For multiple hoses of same size, add their lengths. For different sizes, calculate separately.