Backflow Prevention in Plumbing
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Questions and Answers

What is the condition where the pressure of a piping system exceeds supply pressure?

  • Cross-connection
  • Overpressure (correct)
  • Backsiphonage
  • Backflow

    • What can cause back pressure in a closed system?

  • Fire department pumper connected at a hydrant (correct)
  • High velocity flow in a pipe
  • Clogged air release valve
  • Elevation change in a piping system

    • What is the minimum clearance required to the RV opening during backflow preventer installation?

  • 5 inches
  • 10 inches (correct)
  • 15 inches
  • 12 inches

    • What is the required vertical clearance for a testable backflow assembly?

    <p>18 inches</p> Signup and view all the answers

    Which devices have a critical level of submergence?

    <p>Double Check Valve Backflow Preventer</p> Signup and view all the answers

    What type of backflow protection is required for backsiphonage only in a severe hazard application?

    <p>Air Gap</p> Signup and view all the answers

    What is the hazard rating of a Trap Primer?

    <p>Severe hazard</p> Signup and view all the answers

    What loads the relief valve on a RP to the closed position?

    <p>Spring force</p> Signup and view all the answers

    What is the required protection for make-up water to a plating tank?

    <p>Reduced Pressure Zone Assembly (RPZA)</p> Signup and view all the answers

    What is the disadvantage of Premise Isolation?

    <p>Higher cost</p> Signup and view all the answers

    What can increase a hazard assessment?

    <p>Connection of a boiler system</p> Signup and view all the answers

    What is the requirement for bypass installations in backflow prevention systems?

    <p>Bypasses are prohibited except where an equivalent backflow preventer is installed</p> Signup and view all the answers

    What is the minimum clearance required for backflow preventers installed above grade?

    <p>30 inches</p> Signup and view all the answers

    What happens to ΔP as zone pressure increases on a gauge?

    <p>ΔP increases</p> Signup and view all the answers

    Which backflow prevention devices cannot be used in a closed system?

    <p>Atmospheric Vacuum Breaker</p> Signup and view all the answers

    An Air Gap is sized based on what?

    <p>Vertical distance between the flood level rim and the critical level</p> Signup and view all the answers

    What is the first step when testing a Reduced Pressure (RP) Backflow Assembly?

    <p>Verify the proper installation of the assembly</p> Signup and view all the answers

    What is the minimum distance required between a backflow preventer and a wall or obstruction?

    <p>5 feet</p> Signup and view all the answers

    What is the required back clearance to any backflow assembly?

    <p>10 inches</p> Signup and view all the answers

    What is the hazard classification of a situation where an RPBA is installed but no air gap is present?

    <p>Severe</p> Signup and view all the answers

    What is the minimum pipe size required for a backflow preventer installation?

    <p>3/4 inch</p> Signup and view all the answers

    What is the purpose of a cross-connection control method?

    <p>To prevent backflow into the potable water supply</p> Signup and view all the answers

    What type of backflow prevention device is typically used in a high hazard situation?

    <p>RPBA with air gap</p> Signup and view all the answers

    What is the purpose of a backflow preventer?

    <p>To prevent the flow of contaminated water into the potable water supply</p> Signup and view all the answers

    Study Notes

    Backflow Prevention

    • Bypasses are prohibited except where an equivalent backflow preventer is installed on the bypass.

    Clearance Requirements

    • Minimum clearance to RV opening is 30".
    • Clearance in front of a backflow assembly is 30" or 1500mm.
    • Back clearance to any backflow assembly is 3/4" or 20mm.
    • Required vertical clearance for a testable assembly is 12" or 300mm.

    Hazard Ratings

    • A heat exchanger with double wall leak path requires severe protection.
    • Required potable water protection in a Waste Water Treatment Plant is RPBA + Air Gap.
    • If refused entry to a premise, the hazard rating becomes severe.
    • The hazard rating of a Trap Primer is severe.
    • A plating tank is hazard rated as severe.
    • Required protection for make-up water to a plating tank is RPBA.
    • The required protection for a pressurized tank make-up water with a severe hazard rating is RPBA.

    Backflow Prevention Devices

    • RPBA is required for backflow protection in a Waste Water Treatment Plant.
    • A backflow preventer on a boiler is defined as a device that prevents backflow from occurring.

    Testing and Maintenance

    • Before initial installation of a backflow preventer, ensure proper clearance and installation.
    • To test a RPBA, put CV1 under backpressure, then test the relief valve.
    • If the relief valve on a RPBA opens at less than 2 psi, the spring is weaker than required.
    • The check valve requirements for PVB (SRPVB) are critical.
    • The first step on PVB testing is to ensure proper installation and clearance.

    Backflow Conditions

    • Backpressure can be caused by a Fire pumper truck or a closed system.
    • Backsiphonage can occur due to a drop in system pressure.
    • A closed loop can be created by a PRV, but not a check valve.
    • High velocity flow in a pipe can cause erosion and damage.

    Other Concepts

    • Auxiliary water sources include elevated customer tanks, onsite wells, and cisterns, but not municipal water.
    • A common feature of test cocks and Shut-off valves is that they are used for testing and maintenance.
    • An AVB cannot be used on a severe hazard application.
    • Supply water protection on a Commercial/Industrial Boiler system with chemicals requires RPBA protection.

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    Related Documents

    CCC Need to Know 2019 PDF

    Description

    This quiz covers essential concepts and regulations related to backflow prevention, bypasses, and parallel installations in plumbing systems.

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