Backflow Flashcards
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Which devices can stop backsiphonage?
PVB, DCA, RP, and AVB
Which devices can stop back pressure?
DCA and RP
Which devices can handle constant pressure?
RP, DCA, and PVB
The approved backflow devices for non-health hazards include:
all devices (AVB,PVB,DCA, and RP)
Which device, or devices, are approved when there is chemical applied by aspiration, injection, or emission?
RP
If there is an on-site sewage facility, which back flow is approved?
RP
If major maintenance has to be performed, which back flow device has to be properly installed prior to the repair work being performed?
An approved backflow device
If including a master valve, where does it have to be installed?
Downstream from the PVB, DCA, or RP
Which devices have to be tested upon installation and annually?
Devices used in applications designated as health hazards
Which backflow devices have to be tested upon installation?
All backflow devices
If a DCA is installed below ground, what device is required?
A Y-strainer installed on inlet side of the DCA
If there is an additional water source supplying water to a system being supplied by a potable water supply, what device has to be used on with the potable water supply?
RP
What device cannot be used when there is a health hazard?
DCA
An AVB and PVB can be used in health hazard situations, if the following conditions are not present:
a) Backpressure
b) There is a pump downstream
c) Chemicals added
d) A pressure Regulator
e) A, B and C
e) A, B and C
An Atmospheric Vacuum Breaker:
a) Will stop backpressure
b) Has to be installed 6” higher than the highest head or outlet in the retracted position, will not handle constant pressure, and will stop backsiphonage
c) Has to be installed 12” higher than the highest head or outlet in the retracted position, will handle constant pressure, and will stop back siphonage
d) Has to be installed 6” higher than the highest head or outlet in the retracted position, will not handle constant pressure, and will not stop backpressure
e) A and B
E