BACKFLOW TROUBLESHOOTING EXAM
SCRIPT FINAL PAPER QUESTIONS
ANSWERS COMPREHENSIVE STUDY
RESOURCE
●● 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.
●● While field testing the number 1 check valve of a DC, water
continues to flow from the site tube. What is most likely to be the cause
of this situation?
Answer: Shut off valve #1 one is leaking.
SCRIPT FINAL PAPER QUESTIONS
ANSWERS COMPREHENSIVE STUDY
RESOURCE
●● 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.
●● While field testing the number 1 check valve of a DC, water
continues to flow from the site tube. What is most likely to be the cause
of this situation?
Answer: Shut off valve #1 one is leaking.
