Backflow Prevention and Cross Connection Control Questions and Answers with Solutions UPDATED!!!.

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Backflow Prevention and Cross Connection Control Questions
and Answers with Solutions UPDATED!!!



During DC Test for either check valve, the Check valve is reading
below 1.0 psid. What does this indicate? - ANSWER 1. Dirty or
damaged check disc
2. Dirty or damaged check seat
3. Damaged spring


During DC Test for either check valve, the Check valve reading
above 5.0 psid psid. What does this indicate? - ANSWER 1.
Incorrect CV spring, possible RP spring.


During PVB Air Inlet Test, Air inlet valve does not open, and
reading on field test kit will not drop. What does this indicate? -
ANSWER 1. Leaky No. 1 shutoff valve
2. Parallel installation with leaky No. 2 shutoff valve


During PVB Air Inlet Test, Air inlet valve does not open, as field
test kit drops to 0.0 psid. What does this indicate? - ANSWER 1.
Air inlet disc stuck to seat
2. Broken or missing air inlet spring

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3."O|d style" pressure vacuum breaker (non- loaded air inlet
valve)
4. It is an SVB (See Book 9.5)


During PVB Air Inlet Test, Air inlet valve opens below 1.0 psid,
and reading on field test kit will not drop. What does this
indicate? - ANSWER 1. Dirty or damaged air inlet valve disc
2. Scale buildup on seat
3. Damaged spring


During PVB Check Valve Closing Point Test (Test No. 2), water
runs continuously from test cock No. 2. What does this
indicate? - ANSWER 1. Leaky No. 1 shutoff valve


During PVB Check Valve Test, Check valve reading below 1.0
psid. What does this indicate? - ANSWER 1. Dirty or damaged
check valve disc
2. Dirty or damaged seat
3. Damaged spring