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608.1 General.
A potable water supply system shall be designed, installed and maintained in such a manner so as to prevent contamination from nonpotable liquids, solids or gases being introduced into the potable water supply through cross connections or any other piping connections to the system. Backflow preventer applications shall conform to Table 608.1, except as specifically stated in Sections 608.2 through 608.16.10. Primary backflow prevention devices shall comply with the requirements of the Department of Environmental Protection.
Device | Degree of Hazard a | Application b | Applicable Standards |
Device | Degree of Hazard a | Application b | Applicable Standards |
Backflow prevention assemblies: | |||
Double check backflow prevention assembly | Low hazard | Backpressure or backsiphonage Sizes 3/8" - 12" | ASSE 1015, AWWA C510, CSA B64.5, CSA B64.5.1 |
Double check detector fire protection backflow prevention assemblies | Low hazard | Backpressure or backsiphonage Sizes 2" - 12" | ASSE 1048 |
Pressure vacuum breaker assembly | High or low hazard | Backsiphonage only Sizes 1/2" - 2" | ASSE 1020, CSA B64.1.2 |
Reduced pressure principle backflow preventer | High or low hazard | Backpressure or backsiphonage Sizes 3/8" - 12" | ASSE 1013, AWWA C511, CSA B64.4, CSA B64.4.1 |
Reduced pressure detector fire protection backflow prevention assemblies | High or low hazard | Backsiphonage or backpressure | ASSE 1047 |
Spill-resistant vacuum breaker assembly c | High or low hazard | Backsiphonage only Sizes 1/4" - 2" | ASSE 1056 |
Backflow preventer plumbing devices: | |||
Antisiphon-type fill valves for gravity water closet flush tanks | High hazard | Backsiphonage only | ASSE 1002, CSA B125.3 |
Backflow preventer for carbonated beverage machines | Low hazard | Backpressure or backsiphonage Sizes 1/4"- 3/8" | ASSE 1022 |
Backflow preventer with intermediate atmospheric vents | Low hazard | Backpressure or backsiphonage Sizes 1/4"- 3/8" | ASSE 1012, CSA B64.3 |
Dual-check-valve-type backflow preventer | Low hazard | Backpressure or backsiphonage Sizes 1/4" - 1" | ASSE 1024, CSA B64.6 |
Hose connection backflow preventer | High or low hazard | Low head backpressure, rated working pressure, backpressure or backsiphonage Sizes 1/2" - 1" | ASME A112.21.3, ASSE 1052, CSA B64.2.1.1 |
Hose connection vacuum breaker | High or low hazard | Low head backpressure or backsiphonage Sizes 1/2", 3/4", 1" | ASME A112.21.3, ASSE 1011, CSA B64.2, CSA B64.2.1 |
Laboratory faucet backflow preventer | High or low hazard | Low head backpressure and backsiphonage | ASSE 1035, CSA B64.7 |
Pipe-applied atmospheric-type vacuum breaker | High or low hazard | Backsiphonage only Sizes 1/4" - 4" | ASSE 1001, CSA B64.1.1 |
Vacuum breaker wall hydrants, frost-resistant, automatic-draining type | High or low hazard | Low head backpressure or backsiphonage Sizes 3/4", 1" | ASME A112.21.3, ASSE 1019, CSA B64.2.2 |
Other means or methods: | |||
Air gap | High or low hazard | Backsiphonage or backpressure | ASME A112.1.2 |
Air gap fittings for use with plumbing fixtures, appliances and appurtenances | High or low hazard | Backsiphonage or backpressure | ASME A112.1.3 |
Barometric loop | High or low hazard | Backsiphonage only | (See Section 608.13.4) |
For SI: 1 inch = 25.4 mm.
a. Low hazard.
High hazard – See Contamination (Section 202).
b. See Backpressure, low head (Section 202).
See Backsiphonage (Section 202).
c. The regulations of the Department of Environmental Protection prohibit use of vacuum breaker assemblies as primary backflow prevention devices.
608.2 Plumbing fixtures.
The supply lines and fittings for plumbing fixtures shall be installed so as to prevent backflow. Plumbing fixture fittings shall provide backflow protection in accordance with ASME A112.18.1/CSA B125.1.
608.3 Devices, appurtenances, appliances and apparatus.
Devices, appurtenances, appliances and apparatus intended to serve some special function, such as sterilization, distillation, processing, cooling, or storage of ice or foods, and that connect to the water supply system, shall be provided with protection against backflow and contamination of the water supply system. Water pumps, filters, softeners, tanks and other appliances and devices that handle or treat potable water shall be protected against contamination.
608.3.1 Special equipment, water supply protection.
The water supply for hospital fixtures shall be protected against backflow with a reduced pressure principle backflow prevention assembly, an atmospheric or spill-resistant vacuum breaker, assembly or an air gap. Vacuum breakers for bedpan washer hoses shall not be located less than 5 feet (1524 mm) above the floor. Vacuum breakers for hose connections in health care or laboratory areas shall not be less than 6 feet (1829 mm) above the floor.
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