Residual pressure refers to the pressure remaining in the system under which condition?

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Prepare for the Fire Apparatus Operations and Hydraulics Test. Study efficiently with multiple choice and flashcard questions, each with detailed explanations and hints. Ace your exam!

Multiple Choice

Residual pressure refers to the pressure remaining in the system under which condition?

Explanation:
Residual pressure is the pressure left in the system while water is moving. When water flows from a hydrant or discharge, friction in pipes and hoses (and any elevation changes) causes the pressure to drop from the pump’s output to the flowing point. The remaining pressure during that flow is the residual pressure. It’s not the pressure when nothing is moving (static pressure) and it’s not a fixed value like friction loss per 100 feet. So the best description is the pressure that remains in the system while water is flowing from a hydrant or discharge.

Residual pressure is the pressure left in the system while water is moving. When water flows from a hydrant or discharge, friction in pipes and hoses (and any elevation changes) causes the pressure to drop from the pump’s output to the flowing point. The remaining pressure during that flow is the residual pressure. It’s not the pressure when nothing is moving (static pressure) and it’s not a fixed value like friction loss per 100 feet. So the best description is the pressure that remains in the system while water is flowing from a hydrant or discharge.

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