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Backflow Prevention Assembly Flashcards

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  1. Which backflow prevention assembly is required when the downstream piping may be subject to back-pressure AND the supply may be shut off while the downstream system remains pressurized?

    Answer: Reduced pressure principle assembly

    The reduced pressure principle (RP) assembly is required for high-hazard conditions involving back-pressure scenarios where the downstream system may remain pressurized.

  2. What does the term 'backsiphonage' refer to in backflow prevention?

    Answer: Negative pressure in the supply line drawing contaminants back

    Backsiphonage occurs when negative (subatmospheric) pressure in the supply line creates a siphon that pulls contaminants backward into the potable water system.

  3. A double check valve assembly (DCVA) is appropriate for which hazard classification?

    Answer: Low hazard only

    The DCVA is approved for low-hazard (non-health) cross-connections where there is no risk of contaminating potable water with toxic or health-threatening substances.

  4. During an RP assembly field test, if the #1 check valve shows a differential pressure reading below the minimum acceptable threshold, this indicates:

    Answer: The #1 check valve is fouled or failing

    A #1 check valve differential reading below the minimum threshold (typically 5 psi) indicates the check valve is not holding properly and may be fouled or failing.

  5. Which of the following cross-connections would be classified as a HIGH hazard?

    Answer: Chemical injection system connected to a cooling tower

    A chemical injection system connected to a cooling tower presents a high hazard because toxic chemicals or biological contaminants could enter the potable supply.

  6. An air gap is considered the most reliable form of backflow protection because:

    Answer: It provides a physical separation requiring no mechanical parts to fail

    An air gap requires no mechanical components, so there are no parts to fail or foul, making it the most reliable backflow protection method.

  7. When testing a pressure vacuum breaker (PVB), the tester opens the #2 test cock and the air inlet valve opens. This indicates:

    Answer: The air inlet is functioning properly by opening under test conditions

    The air inlet valve on a PVB should open when the body of the assembly is depressurized during testing, which is the normal and expected response.