1. What is a Hose Friction Loss Calculator?

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

Purpose: It helps engineers, firefighters, and fluid system designers determine the pressure drop in hose systems to ensure proper system performance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \Delta P \) — Pressure loss (psi)
• \( C \) — Friction coefficient (dimensionless)
• \( Q \) — Flow rate (gallons per minute)
• \( L \) — Hose length (feet)

Explanation: The pressure loss increases with the square of the flow rate and linearly with hose length, scaled by the friction coefficient.

3. Importance of Friction Loss Calculation

Details: Proper friction loss estimation ensures adequate pump sizing, proper nozzle performance, and efficient system design.

4. Using the Calculator

Tips: Enter the friction coefficient (specific to your hose type), flow rate in gpm, and hose length in feet. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find the friction coefficient for my hose?
A: The coefficient is typically provided by the hose manufacturer or can be found in engineering references for your specific hose type.

Q2: Why does flow rate have a squared relationship with pressure loss?
A: This reflects the turbulent flow regime where pressure loss increases exponentially with flow velocity.

Q3: Does this calculator account for elevation changes?
A: No, this calculates only friction loss. For elevation changes, additional calculations are needed.

Q4: What's a typical friction coefficient for fire hoses?
A: Common values range from 8-24 depending on hose diameter and material (e.g., 12 for 1.75" rubber-lined hose).

Q5: How accurate is this calculation?
A: It provides a good estimate for turbulent flow conditions. For precise calculations, consider additional factors like hose age and temperature.