Fire Flow Calculator Hose Monster

Fire Flow Formula:

\[ Q = 29.83 \times C \times d^2 \times \sqrt{P_{pitot}} \]

Fire Flow (Q): gpm

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1. What is a Fire Flow Calculator Hose Monster?

Definition: This calculator estimates the water flow rate from a fire hose nozzle based on the nozzle coefficient, diameter, and pitot pressure.

Purpose: It helps firefighters and fire protection professionals determine the water flow rate for firefighting operations.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = 29.83 \times C \times d^2 \times \sqrt{P_{pitot}} \]

Where:

\( Q \) — Flow rate (gallons per minute)
\( C \) — Nozzle coefficient (typically 0.9 for smooth bore nozzles)
\( d \) — Nozzle diameter (inches)
\( P_{pitot} \) — Pitot pressure (psi)

Explanation: The formula calculates water flow based on nozzle characteristics and measured pressure.

3. Importance of Fire Flow Calculation

Details: Accurate flow calculation ensures proper water application during firefighting, adequate fire stream reach, and correct pump pressure settings.

4. Using the Calculator

Tips: Enter the nozzle coefficient (default 0.9), diameter in inches (default 2.5"), and pitot pressure in psi. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical nozzle coefficient?
A: Most smooth bore nozzles have a coefficient of about 0.9, while fog nozzles may vary.

Q2: How do I measure pitot pressure?
A: Use a pitot gauge at the center of the fire stream, about 1.5 nozzle diameters from the tip.

Q3: Why is nozzle diameter squared in the formula?
A: The area of the nozzle opening (which affects flow) is proportional to the square of the diameter.

Q4: What's a common nozzle diameter?
A: Common sizes are 1", 1.25", 1.5", 1.75", and 2.5" for handlines, with larger diameters for master streams.

Q5: How accurate is this calculation?
A: With proper measurements, it's accurate to within about 5% for smooth bore nozzles.