An Atmospheric Vacuum Breaker (AVB) must NOT be installed where it may be subjected to continuous pressure for more than how many hours?

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Multiple choice — select the best answer

A6 hours
B10 hours
C12 hours
D24 hours

✓ Correct answer: C. 12 hours An AVB is rated for intermittent service only and must not remain under continuous supply pressure for more than 12 hours, because the float/poppet seal can deform and fail, losing backflow protection.

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Topic: Assembly Types

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An Atmospheric Vacuum Breaker (AVB) must NOT be installed where it may be subjected to continuous pressure for more than how many hours?

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