Cross Connection Practice Exam

Before testing a Reduced Pressure Principle Backflow Assembly, what must be ensured?

1. The inlet shutoff valve must be closed

2. The inlet shutoff valve must be open

3. The relief valve must be fully operational

4. The test cock must be clear

The correct answer is: The inlet shutoff valve must be open

Before testing a Reduced Pressure Principle Backflow Assembly, it is crucial that the inlet shutoff valve is open. This is because the assembly needs to be under normal operating conditions for a proper test to be conducted. By having the inlet shutoff valve open, the flow of water through the assembly is maintained, allowing for accurate readings of pressure differentials across the assembly’s components during the test. Ensuring an open inlet shutoff valve allows the tester to evaluate the functionality of the assembly effectively. If the valve were closed, it would prevent water from flowing through the system, resulting in inaccurate test results and potentially providing a false sense of security regarding the integrity of the backflow prevention device. In addition, while other components like the relief valve being operational or the test cock being clear may be necessary for accurate testing procedures, they are secondary to the fundamental requirement that water must flow through the assembly openly to properly assess its performance.