PE Civil Engineering Exam Prep

Category - Civil Engineering

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Which of the following definitions best describes water hammer?

The impulsive force of water that is stopped too quickly
Properly backfill pipe trench
Use of air pressure for testing
Use of hydrostatic pressure for testing

Explanation

Answer: A - Water hammer is the impulsive force of water that is stopped too quickly. In general, the maximum recommended average velocity in a closed pipeline is 5 ft/sec. When the velocity of flow within a pipeline exceeds 5 ft/sec, pressure surges may develop within the pipeline if the flow is stopped suddenly. The rapid change in momentum of the water causes this impulsive force.

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