cross-contamination Flashcards
It is permissible to have a shut-off valve downstream from a atmospheric vacuum breaker?
No
An atmospheric vacuum breaker AVB, should never be used with continuous pressure for more then?
1 hour
6 hours
12 hours
24 hours
12 Hours
AVB are effective protection against?
Back Siphonage
The springs on the first and second Check Valves on an RP assembly are interchangeable?
False
What devices may be used for premise isolation?
RP. DCVA, DuC
How much clearance is required above a RP assembly?
300mm
PVB, Presssure Vacuum Breaker, are effective protection against?
Back Siphonage
Air Gap should be inspected annually?
True (yes)
Where is the vacuum breaker located in a flushometer?
In the tailpiece between the flushometer and fixture
What is the minimum cross connection control protection for a commercial hydronic heating boiler with no means of adding chemicals?
Double check Valve assembly
What backflow assembly components require reilient seating?
Resilient seating is not a requirement
What devices require a permit?
RP, DCVA, PVB
What non testable device is similar to a PVB?
AVB
What is the minimum that a PVB maybe located above the flood level rim?
12” 300mm
How is a PVB sized?
Supply size
How many check valves does a DCVA have?
2
What is a RP?
Reduced Pressure
What does the abbreviation HCVB stand for?
Hose Connection Vacuum Breaker
If pressure downstream of a RP rose because of thermal expansion or water hammer, which part maybe damaged?
Check Valve #2
During Flow conditions, what position will both checks be in referring to a DCVA?
Open
Which Backflow preventer maybe intalled in a pit?
DCVA
Define Zone Protection
Internal protection (Select fixtures)
Define Area Protection
Protection of an area of non-potable and potable plumbing within a facility.
