1. What is a Hose Monster Hydrant Flow Test Calculator?

Definition: This calculator determines the flow rate from a fire hydrant using measurements from a Hose Monster pitot tube.

Purpose: It helps firefighters and water system operators assess hydrant performance and available water supply.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute)
• \( c \) — Discharge coefficient (typically 0.9)
• \( d \) — Outlet diameter (inches, typically 2.5")
• \( P \) — Pitot pressure (psi)

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

3. Importance of Hydrant Flow Testing

Details: Regular flow testing ensures hydrants meet firefighting requirements and helps identify water system deficiencies.

4. Using the Calculator

Tips: Enter the discharge coefficient (default 0.9), outlet diameter (default 2.5 inches), and pitot pressure reading. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical discharge coefficient?
A: Most Hose Monster pitot tubes use 0.9, but check manufacturer specifications for your specific model.

Q2: Why is outlet diameter important?
A: Flow rate increases with the square of the diameter, making this a critical measurement.

Q3: How do I measure pitot pressure?
A: Use a calibrated pressure gauge on the pitot tube while water is flowing at maximum capacity.

Q4: What affects hydrant flow rate?
A: Water system pressure, pipe size, hydrant condition, and nearby water usage all impact flow.

Q5: How often should hydrants be flow tested?
A: NFPA recommends testing every 5 years, or more frequently in critical areas.