Blaze Through the Certified Fire Protection Specialist (CFPS) Exam 2025 – Ignite Your Career Now!

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What is the flow rate from a 2.5-inch fire hydrant outlet with a pitot reading of 42 psi?

800 gpm

900 gpm

1089 gpm

To determine the flow rate from a fire hydrant outlet based on a pitot reading, the formula that relates the pitot pressure to flow rate can be applied. The flow rate (GPM) can be estimated using the formula:

\[

Q = 29.7 \times d^2 \times \sqrt{P}

\]

where:

- \( Q \) is the flow rate in gallons per minute (GPM),

- \( d \) is the diameter of the outlet in inches,

- \( P \) is the pitot pressure in psi.

For a 2.5-inch outlet and a pitot reading of 42 psi, we can plug in the values:

1. Calculate \( d^2 \):

\( 2.5^2 = 6.25 \)

2. Calculate \( \sqrt{P} \):

\( \sqrt{42} \approx 6.48 \)

3. Now, apply these values into the flow rate formula:

\[

Q = 29.7 \times 6.25 \times 6.48

\]

Calculating that gives:

\[

Q \approx 29.7 \times 6

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