Backflow Prevention Practice Exam

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If testing a double check valve assembly check valve with a water column, the maintained water column height must be at least _____?

24 in. (61 cm)
28 in. (71 cm)
32 in. (81 cm)
40 in. (102 cm)

The correct answer is: 28 in. (71 cm)

The correct answer is based on the requirement for maintaining an adequate water column height during the testing of a double check valve assembly. In backflow prevention, ensuring a sufficient water column height is essential for accurately measuring the pressure differential across the check valves. A maintained height of at least 28 inches (71 cm) helps to ensure that the valves are functioning correctly and can provide the necessary protection against backflow. This height allows for the appropriate pressure to be exerted on the system, which in turn facilitates proper operation of the double check valve during testing. If the water column is too low, it may not create the necessary pressure differential required to confirm that the check valves are sealing effectively, potentially leading to improper conclusions about their performance. This standard height ensures reliable testing and compliance with industry requirements for backflow prevention devices.