Backflow Prevention Practice Exam

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How long can atmospheric vacuum breakers be subject to continuous water pressure?

3 hours
6 hours
12 hours
24 hours

The correct answer is: 12 hours

Atmospheric vacuum breakers are designed to prevent backflow by allowing air into the piping system to break a vacuum condition. However, when it comes to continuous water pressure, these devices have specific limitations. They can only withstand continuous water pressure for a duration of 12 hours. Exceeding this time frame can lead to failure in the device's ability to function properly, potentially compromising the backflow prevention. This limitation is important for maintaining system integrity and safeguarding against contamination. Regular inspections and adherence to these time constraints are crucial for effective backflow prevention in any plumbing system where vacuum conditions may occur.