Page 658 - 2018_IRC

WATER SUPPLY AND DISTRIBUTION

TABLE P2902.3
APPLICATION FOR BACKFLOW PREVENTERS
APPLICABLE
DEVICE DEGREE OF HAZARD a APPLICATION b
STANDARDS
Backflow Prevention Assemblies
Double-check backflow prevention assembly and Backpressure or backsiphonage ASSE 1015, AWWA C510,
double-check fire protection backflow Low hazard Sizes / ″ – 16″ CSA B64.5, CSA B64.5.1
3
prevention assembly 8
Double-check detector fire protection backflow Low hazard Backpressure or backsiphonage ASSE 1048
prevention assemblies Sizes 2″ – 16″
Pressure vacuum breaker assembly High or low hazard Backsiphonage only Sizes / ″ – 2″ ASSE 1020, CSA B64.1.2
1
2
Reduced pressure principle backflow prevention Backpressure or backsiphonage ASSE 1013, AWWA C511,
assembly and reduced pressure principle fire High or low hazard Sizes / ″ – 16″ CSA B64.4, CSA B64.4.1
3
protection backflow prevention assembly 8
Reduced pressure detector fire protection High or low hazard Backsiphonage or backpressure ASSE 1047
backflow prevention assemblies (Fire sprinkler systems)
1
Spill-resistant vacuum breaker High or low hazard Backsiphonage only Sizes / ″ – 2″ ASSE 1056, CSA B64.1.3
4
Backflow Preventer Plumbing Devices
ASSE 1002/
Antisiphon-type fill valves for gravity water closet High hazard Backsiphonage only ASME A112.1002/
flush tanks
CSA B125.12, CSA B125.3
Backflow preventer with intermediate Low hazard Backpressure or backsiphonage ASSE 1012, CSA B64.3
3
1
atmospheric vents Sizes / " – / ″
8
4
Backpressure or backsiphonage
Dual-check-valve-type backflow preventers Low hazard 1 ASSE 1024, CSA B64.6
Sizes / ″ – 1″
4
Low head backpressure, rated
Hose-connection backflow preventer High or low hazard working pressure backpressure or ASSE 1052, CSA B64.2.1.1
1
backsiphonage Sizes / ″ – 1″
2
Low head backpressure or backsi- ASSE 1011, CSA B64.2,
Hose-connection vacuum breaker High or low hazard 1 3
phonage Sizes / ″, / ″, 1″ CSA B64.2.1
2
4
Low head backpressure and back-
Laboratory faucet backflow preventer High or low hazard ASSE 1035, CSA B64.7
siphonage
1
Pipe-applied atmospheric-type vacuum breaker High or low hazard Backsiphonage only Sizes / ″ – 4″ ASSE 1001, CSA B64.1.1
4
Vacuum breaker wall hydrants, frost-resistant, High or low hazard Low head backpressure or backsi- ASSE 1019, CSA B64.2.2
3
automatic-draining type phonage Sizes / ″ – 1″
4
Other Means Or Methods
Air gap High or low hazard Backsiphonage only ASME A112.1.2
Air gap fittings for use with plumbing fixtures, High or low hazard Backsiphonage or backpressure ASME A112.1.3
appliances and appurtenances
For SI: 1 inch = 25.4 mm.
a. Low hazard—See Pollution (Section R202). High hazard—See Contamination (Section R202).
b. See Backpressure (Section R202). See Backpressure, Low Head (Section R202). See Backsiphonage (Section R202).
P2902.4.2 Deck-mounted and integral vacuum break- uum breaker, a pressure vacuum-breaker assembly or a
ers. Approved deck-mounted or equipment-mounted vac- permanently attached hose connection vacuum breaker.
uum breakers and faucets with integral atmospheric Exceptions:
vacuum breakers or spill–resistant vacuum breaker assem-
blies shall be installed in accordance with the manufac- 1. This section shall not apply to water heater and
turer’s instructions and the requirements for labeling. The boiler drain valves that are provided with hose
critical level of the breakers and assemblies shall be connection threads and that are intended only for
located at not less than 1 inch (25 mm) above the flood tank or vessel draining.
level rim. 2. This section shall not apply to water supply
P2902.4.3 Hose connection. Sillcocks, hose bibbs, wall valves intended for connection of clothes wash-
hydrants and other openings with a hose connection shall ing machines where backflow prevention is oth-
be protected by an atmospheric-type or pressure-type vac- erwise provided or is integral with the machine.

2018 INTERNATIONAL RESIDENTIAL CODE ® 633
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