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- Certified Irrigation Technician Backflow Prevention Devices Flashcards

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  1. A technician discovers that an RPZ assembly's relief valve is continuously discharging water. What is the most likely cause of this condition?

    Answer: The first check valve is fouled or not seating properly

    When the first check valve of an RPZ assembly fails to seat properly, the zone of reduced pressure cannot be maintained. The relief valve opens to discharge water and prevent backflow, indicating that the first check valve needs repair or replacement.

  2. According to most plumbing codes, how often must a testable backflow prevention assembly be tested after installation?

    Answer: Annually

    Most plumbing codes and water purveyors require that testable backflow prevention assemblies (RPZ, DCVA, PVB, SVB) be tested at least annually by a certified tester. Some jurisdictions may require more frequent testing.

  3. Which backflow prevention device relies on an air gap between the outlet and the flood rim of a receiving vessel?

    Answer: Air Gap Separation

    An air gap separation is the simplest and most reliable form of backflow prevention. It creates a physical disconnect between the water supply outlet and the flood rim of a receiving vessel, making backflow physically impossible.

  4. A Pressure Vacuum Breaker (PVB) must be installed at what minimum height above the highest downstream outlet?

    Answer: 12 inches

    A PVB must be installed at least 12 inches above the highest downstream point of use (sprinkler head or emitter). This ensures that backpressure cannot develop and the air inlet valve can function properly.

  5. During a backflow assembly test, the technician finds that the second check valve on a Double Check Valve Assembly (DCVA) has zero differential. What action should be taken?

    Answer: Clean and repair or replace the second check valve components

    A zero differential on the second check valve means it is not functioning properly and must be repaired or have its internal components replaced. Both check valves must maintain a minimum pressure differential for the assembly to pass the test.

  6. Which type of backflow condition occurs when a water main breaks or a fire hydrant is opened, creating a negative pressure in the supply line?

    Answer: Backsiphonage

    Backsiphonage occurs when negative pressure or a vacuum develops in the supply piping, such as when a water main breaks or a nearby fire hydrant is opened. This can siphon non-potable water from an irrigation system back into the public water supply.