During a fire pump test with an electric driver, which instrument is used to measure discharge velocity?

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Get ready for the NICET Level 3 ITM of Water-Based Systems Test. Practice with flashcards and multiple choice questions, each with hints and explanations. Prepare for success!

Multiple Choice

During a fire pump test with an electric driver, which instrument is used to measure discharge velocity?

Explanation:
Measuring how fast water is moving in the discharge line is essential for confirming pump performance. A Pitot gauge is built to translate the flow’s velocity into a pressure reading that you can use directly. By placing a Pitot tube in the flow with a stagnation port facing upstream and a static port to sense ambient pressure, you get the dynamic pressure. Then you convert that pressure to velocity using v = sqrt(2ΔP/ρ), where ΔP is the dynamic pressure and ρ is the water density. The other instruments don’t measure velocity: an ammeter tracks electrical current to the motor, a calibrator is for setting instrument accuracy, and a hydrometer measures liquid density, not flow speed. So the Pitot gauge is the appropriate tool for discharge velocity in a fire pump test.

Measuring how fast water is moving in the discharge line is essential for confirming pump performance. A Pitot gauge is built to translate the flow’s velocity into a pressure reading that you can use directly. By placing a Pitot tube in the flow with a stagnation port facing upstream and a static port to sense ambient pressure, you get the dynamic pressure. Then you convert that pressure to velocity using v = sqrt(2ΔP/ρ), where ΔP is the dynamic pressure and ρ is the water density. The other instruments don’t measure velocity: an ammeter tracks electrical current to the motor, a calibrator is for setting instrument accuracy, and a hydrometer measures liquid density, not flow speed. So the Pitot gauge is the appropriate tool for discharge velocity in a fire pump test.

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