Backflow Prevention Practice Exam

Prior to testing the check valves in a double check valve assembly, what must a tester determine first?

1. Determine the tightness of shut-off valve number 2

2. Notify the owner of the water shut-off

3. Record the water supply line pressure

4. Submit the test report to the water supply

The correct answer is: Determine the tightness of shut-off valve number 2

To ensure accuracy and safety when testing the check valves in a double check valve assembly, determining the tightness of shut-off valve number 2 is crucial. This step ensures that the assembly is properly isolated from the water supply before any testing takes place. If the shut-off valve is not tight, it could lead to water flowing back or leaking during the testing process, which would compromise the results. Starting with a secure shut-off allows the tester to have a controlled environment where the double check valve assembly can be assessed without the risk of water interference. This step is foundational to achieving valid test results and maintaining the integrity of the backflow prevention system. The other choices, while they may be relevant in the context of backflow prevention, do not address the immediate need to ensure that the assembly is undisturbed and leak-free before beginning the tests. For example, notifying the owner of the water shut-off is a necessary step but can occur after verifying the shut-off valve's status. Similarly, recording the water supply line pressure, although important, is part of the testing procedure that follows the initial assessment of the shut-off valves. Submitting the test report is a post-testing activity that is not relevant to the preparatory steps before testing the check