Application for Backflow Preventers
Device
|
Degree of Hazard a
|
Application b
|
Applicable Standards
|
Air gap c
|
High or low hazard
|
Backsiphonage or backpressure
|
ASME A112.1.2
|
Antisiphon-type Water Closet Flush Tank Ball Cock
|
Low Hazard
|
Backsiphonage only
|
ASSE 1002
CSA CAN/CSA-B125
|
Reduced Pressure Principle Backflow Preventer
|
High or low hazard
|
Backpressure or backsiphonage
Sizes 1/4" to 10"
|
ASSE 1013
AWWA C511
CSA CAN/CSA B64.4
|
Reduced Pressure Detector Assembly Backflow Preventer
|
High or low hazard
|
Backsiphonage or backpressure
|
ASSE 1047
|
Double Check Backflow Prevention Assembly
|
Low hazard
|
Backpressure or backsiphonage
Sizes 3/8" to 16"
|
ASSE 1015
AWWA C510
|
Double Check Detector Backflow Preventer Assembly
|
Low hazard
|
Backpressure or backsiphonage (Fire sprinkler systems)
Sizes 1 1/2" - 16"
|
ASSE 1048
|
Dual Check Valve-Type Backflow Preventer
|
Low hazard
|
Backpressure or backsiphonage
Sizes 1/4" - 1"
|
ASSE 1024
|
Backflow Preventer with Intermediate Atmospheric Vents
|
Low hazard
|
Backpressure or backsiphonage
Sizes 1/4" - 3/4"
|
ASSE 1012
CSA CAN/CSA-B64.3
|
Dual Check Valve-Type Backflow Preventer for Carbonated Beverage Dispensers/Post Mix Type
|
Low hazard
|
Backpressure or backsiphonage
Sizes 1/4" - 3/8"
|
ASSE 1032
|
Pipe-Applied Atmospheric-Type Vacuum Breaker
|
High or low hazard
|
Backsiphonage only
Sizes 1/4" - 4"
|
ASSE 1001
CSA CAN/CSA-B64.1.1
|
Pressure Vacuum Breaker Assembly
|
High or low hazard
|
Backsiphonage only
Sizes 1/2" - 2"
|
ASSE 1020
|
Hose-connection Vacuum Breaker
|
High or low hazard
|
Backsiphonage
Sizes 1/2", 3/4", 1"
|
ASSE 1011
CSA CAN/CSA-B64.2
|
Vacuum Breaker Wall Hydrants, Frost-Resistant, Automatic Draining Type
|
High or low hazard
|
Backsiphonage
Sizes 3/4", 1"
|
ASSE 1019
CSA CAN/CSA-B64.2.2
|
Laboratory Faucet Backflow Preventer
(Non-testable)
|
Low hazard
|
Backsiphonage
|
ASSE 1035
CSA B64.7
|
Hose Connection Backflow Preventer
(Non-testable)
|
Low hazard
|
Low head backpressure, rated working pressure
backpressure or backsiphonage
Sizes 1/2" - 1"
|
ASSE 1052
|
Spill-proof vacuum breaker
|
High or low hazard
|
Backsiphonage only
Sizes 1/4" - 2"
|
ASSE 1056
|
|
For SI: 1 inch = 25.4 mm
a ) Low Hazard - See Pollution (Section 202) and Department of Water requirements
High Hazard - See Contamination (Section 202) and Department of Water requirements
b ) See Backpressure (Section 202)
See Backpressure, Low Head (Section 202)
See Backsiphonage (Section 202)
c) Break tank
d )For systems using non-food grade chemical additives