Backflow Prevention Practice Exam

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If testing a backflow preventer using a differential gauge and a single hose, it is important to _____?

Keep the high and low manifold valves open
Maintain the gauge and hose connections at the same height as the assembly
Open the low-pressure and bypass control valves
Plug the bypass and low-pressure hose end connections

The correct answer is: Maintain the gauge and hose connections at the same height as the assembly

Maintaining the gauge and hose connections at the same height as the assembly is crucial when testing a backflow preventer using a differential gauge and a single hose. This practice ensures that readings are accurate and reflect the true pressure differential across the device. Variations in height can lead to differences in pressure readings due to the hydrostatic pressure of the fluid column, which would result in misleading data. By aligning the connections properly, you ensure that the measurement accurately represents the operational conditions of the backflow preventer, facilitating effective testing and evaluation.