Sample interview questions: Can you explain your knowledge of backflow prevention systems and their installation?
Sample answer:
Knowledge of Backflow Prevention Systems and Installation
Types of Backflow Prevention Systems
- Air Gap: Physical separation between the water source and drains to prevent backflow.
- Double Check Valve: Two independent check valves in series, preventing flow reversal from higher to lower pressures.
- Reduced Pressure Zone (RPZ): Creates a low-pressure zone between the water supply and potential backflow source.
- Atmospheric Vacuum Breaker (AVB): Allows air to enter the system when the water pressure drops, preventing backflow.
Installation Considerations
- Proper Sizing: Determine the required capacity and flow rate based on the water source and fixture demand.
- Location: Install devices upstream from potential backflow sources (e.g., sinks, toilets, floor drains).
- Accessibility: Allow for easy maintenance and testing.
- Testing and Certificati… Read full answer
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