Cross Connection Practice Exam

Which condition could indicate a malfunctioning backflow prevention assembly during testing?

1. Fluctuating pressure readings

2. No pressure change during testing

3. Successful pressure holding

4. Normal operation after installation

The correct answer is: Fluctuating pressure readings

Fluctuating pressure readings during the testing of a backflow prevention assembly can indicate a malfunction. This fluctuation suggests that water is able to move back and forth or that there are inconsistencies in the pressure within the system, which should not occur if the assembly is functioning correctly. A properly working backflow prevention device maintains a steady pressure, preventing the reverse flow of water that could contaminate the potable water supply. Therefore, observing fluctuations prompts further investigation and potential maintenance or replacement of the assembly to ensure it is effectively preventing backflow. On the other hand, no pressure change during testing suggests that the assembly is functioning properly, as a lack of movement in pressure indicates effective sealing. Successful pressure holding indicates that the assembly can maintain pressure, which is another sign of normal operation. Normal operation after installation implies that the assembly has been set up correctly and is working as intended.