BACKFLOW TROUBLESHOOTING QUIZ

While field testing the check valve of a pressure vacuum breaker, water continues to flow from the # 2 test cock . How do you proceed ? - Answer-Open the bleed off valve until the flow slows to a slight drip. Well field testing the first check valve of a double check valve assembly, water continues to flow from the site tube. How do you proceed? - Answer-Observe reading on gauge (first step). Open high side of bleed valve (second step). While field testing the check valve of a spill resistant pressure vacuum breaker, water continues to flow from the vent valve. What does this imply? - Answer-Number 1 shut off valve is leaking. While field testing the differential pressure relief valve opening point of RP, it is found that the shut - off valve # 2 is leaking . How should the temporary bypass hose be connected to compensate for the leak? - Answer-Test cock # 1 to test cock # 4 While field testing the second check valve of a reduced pressure principle assembly, high side pressure is applied through test cock # 4 and the gage reading begins to increase. How do you proceed? - Answer-Close the # 2 test cock. While field testing the differential pressure relief valve opening point of an RP, the high side control needle valve is open, and the low side control needle valve is open 1/4 turn, however the reading on the gauge will not lower to the relief valve opening point. What does this imply? - Answer-Number 2 shut off valve is leaking What are acceptable field test readings for a properly operating double check valve assembly? - Answer-Check valve number 1: 1.0 PSID and above/ check valve number 2: 1.0 P ID and above When testing an RP, upon closing the number 2 shut off valve and the high and low side bleed valves, the gauge reading drops and differential pressure relief valve begins to discharge. How do you proceed? - Answer-Record the number 1 check valve is leaking and end the test.