Backflow Prevention Practice Exam

When a piping discharge is near a wall, the air-gap separation must be increased an additional ____ pipe diameter(s).

1. 1

2. 2

3. 3

4. 4

The correct answer is: 1

To ensure effective backflow prevention, an air-gap separation is crucial, especially when a discharge pipe is positioned near a wall. An additional air-gap of one pipe diameter is recommended in such scenarios to accommodate potential disruptions in flow or pressure. This extra space helps to prevent backflow by ensuring that any water from the discharge does not come into contact with potential contaminants that might be present on the wall. Implementing this additional distance creates a buffer that enhances safety and performance, particularly in maintaining the integrity of the potable water supply. By ensuring this extra measure is followed, it reinforces adherence to best practices and regulatory guidelines for backflow prevention.