Test Procedures
This backflow preventer may require the use of a "vertical pipe"
What is the double check valve
Approved for sewer applications
What is the Air Gap
The unintentional reverse flow of water
What is Backflow
The type of relief valve discharge caused by fluctuating line pressure
What is intermittent discharge
The maximum number of days that test report forms are to be submitted by
What is 7 calendar days
The minimum buffer value
What is 3.0psi
The vertical pipe may be installed in this test port in step 2 of the DC test procedure
What is test port 4
Both check valves have a minimum value of 1.0psid
What is the double check valve
Passed in 1974, amended in 1986 and 1996.
What is the Safe Drinking Water Act
Continuous discharge is usually caused by this fouled RP component
What is
check valve #1
Testing frequencies are initial, annual, repair, and _______________
What is relocate
The minimum and maximum height for outdoor installations
Whats is 12" minimum and maximum of 36"
The backflow preventer requiring a higher value in step 1 than in step 2
What is the SVB
Not approved for continuous pressure
What is the atmospheric vacuum breaker
System pressure greater than supply pressure
What is backpressure
This will cause the water level in the vertical pipe to drop is step 2 of the DC test
What is a leaking shutoff valve #2
The minimum distance above downstream piping for AVB's
What is 6"
The relief is designed to open at no less than ________psi of supply pressure
What is 2 pounds
Step 4 of the RP test procedure
What is the confirmed reading
Check valve opens first, then air inlet valve closes
What is the PVB
The head pressure at the bottom of a 6" pipe rising 80'
What is 34.64psi
This causes water to continue to flow from test port 2 in step 2 of the PVB test
What is a leaking shut off valve #1
The ideal amount of air pressure in a thermal expansion tank
What is system water pressure
The position of the check valves and relief valve in a backpressure condition
What is check valves and relief valve are closed
This may cause the relief valve to leak in step 3 of the RP test procedure
What is disc compression or fouled CV2
Requiring 12" min and 60" maximum for indoor and outdoor installations
What is the PVB and SVB
The principle describing how water pressure decreases as it flows through a constriction in piping
What is Bernouli's Principle
A missing or broken relief valve spring will cause the relief to do this
What is to not open
USC's "rated flow method" is used for these line sizes
What is 12" and larger
The two RP components that the buffer have in common
What is the relief valve and check valve #1