Backflow Prevention Practice Exam

Which application is NOT suitable for pressure vacuum breakers?

1. High hazard/backsiphonage

2. Low hazard/backpressure

3. High hazard/continuous pressure

4. Low hazard/intermittent pressure

The correct answer is: Low hazard/backpressure

Pressure vacuum breakers are specifically designed to prevent backflow in situations where back siphonage can occur. They are effective in low hazard scenarios with intermittent pressure and provide robust protection against contamination from non-potable sources. The key feature of this device is its ability to operate under specific conditions. It functions well to circumvent situations where there is a reduction in pressure leading to back siphonage but is unsuitable in high hazard applications, particularly when there is continuous pressure involved. Continuous pressure applications, especially in high hazard scenarios, can lead to a situation particularly dangerous for potable water supplies unless other devices, like reduced pressure zone (RPZ) assemblies, are used to offer that level of safety. By understanding the specific design and limits of pressure vacuum breakers, it becomes clear that they are not suitable for applications that involve high hazard and continuous pressure, thereby making it appropriate for low hazard but intermittent situations. Thus, the identification of low hazard/backpressure as unsuitable reflects a misunderstanding of the scenarios where these devices are effective.