Page 657 - 2018_IRC

WATER SUPPLY AND DISTRIBUTION

P2901.2.2.1 Color. The color of the pipe identification mm) above the highest elevation of downstream piping
shall be discernable and consistent throughout the and the flood level rim of the fixture or device.
building. The color purple shall be used to identify P2902.3.3 Backflow preventer with intermediate atmo-
reclaimed, rain and gray-water distribution systems. spheric vent. Backflow preventers with intermediate
P2901.2.2.2 Lettering size. The size of the background atmospheric vents shall conform to ASSE 1012 or CSA
color field and lettering shall comply with Table B64.3. These devices shall be permitted to be installed
P2901.2.2.2. where subject to continuous pressure conditions. These
P2901.2.2.3 Identification tape. Where used, identifi- devices shall be prohibited as a means of protection where
cation tape shall be not less than 3 inches (76 mm) wide any hazardous chemical additives are introduced down-
and have white or black lettering on a purple field stating stream of the device. The relief opening shall discharge by
“CAUTION: NONPOTABLE WATER—DO NOT air gap and shall be prevented from being submerged.
DRINK.” Identification tape shall be installed on top of P2902.3.4 Pressure vacuum breaker assemblies. Pres-
nonpotable rainwater distribution pipes and fastened not sure vacuum breaker assemblies shall conform to ASSE
greater than every 10 feet (3048 mm) to each pipe length, 1020 or CSA B64.1.2. Spill-resistant vacuum breaker
and run continuously the entire length of the pipe. assemblies shall comply with ASSE 1056. These assem-
blies are designed for installation under continuous pres-
sure conditions where the critical level is installed at the
SECTION P2902 required height. The critical level of a pressure vacuum
PROTECTION OF POTABLE WATER SUPPLY breaker and a spill-resistant vacuum breaker assembly
P2902.1 General. A potable water supply system shall be shall be set at not less than 12 inches (304 mm) above the
designed and installed as to prevent contamination from non- highest elevation of downstream piping and the flood level
potable liquids, solids or gases being introduced into the pota- rim of the fixture or device. Pressure vacuum breaker
ble water supply. Connections shall not be made to a potable assemblies shall not be installed in locations where spill-
water supply in a manner that could contaminate the water age could cause damage to the structure.
supply or provide a cross connection between the supply and P2902.3.5 Reduced pressure principle backflow pre-
a source of contamination except where approved backflow vention assemblies. Reduced pressure principle backflow
prevention assemblies, backflow prevention devices or other prevention assemblies and reduced pressure principle fire
means or methods are installed to protect the potable water protection backflow prevention assemblies shall conform
supply. Cross connections between an individual water sup- to ASSE 1013, AWWA C511, CSA B64.4 or CSA
ply and a potable public water supply shall be prohibited.
B64.4.1. Reduced pressure detector fire protection back-
P2902.2 Plumbing fixtures. The supply lines and fittings for flow prevention assemblies shall conform to ASSE 1047.
every plumbing fixture shall be installed so as to prevent back- These devices shall be permitted to be installed where sub-
flow. Plumbing fixture fittings shall provide backflow protec- ject to continuous pressure conditions. The relief opening
tion in accordance with ASME A112.18.1/CSA B125.1. shall discharge by air gap and shall be prevented from
P2902.3 Backflow protection. A means of protection against being submerged.
backflow shall be provided in accordance with Sections P2902.3.6 Double-check backflow prevention assem-
P2902.3.1 through P2902.3.7. Backflow prevention applica- blies. Double-check backflow prevention assemblies shall
tions shall conform to Table P2902.3, except as specifically conform to ASSE 1015, CSA B64.5, CSA B64.5.1 or
stated in Sections P2902.4 through P2902.5.5. AWWA C510. Double-check detector fire protection
P2902.3.1 Air gaps. Air gaps shall comply with ASME backflow prevention assemblies shall conform to ASSE
A112.1.2 and air gap fittings shall comply with ASME 1048. These assemblies shall be capable of operating
A112.1.3. An air gap shall be measured vertically from the under continuous pressure conditions.
lowest end of a water outlet to the flood level rim of the fix- P2902.3.7 Dual check backflow preventer. Dual check
ture or receptor into which the water outlets discharges to backflow preventers shall conform with ASSE 1024 or
the floor. The required air gap shall be not less than twice CSA B64.6.
the diameter of the effective opening of the outlet and not P2902.4 Protection of potable water outlets. Potable water
less than the values specified in Table P2902.3.1.
openings and outlets shall be protected by an air gap, a
P2902.3.2 Atmospheric-type vacuum breakers. Atmo- reduced pressure principle backflow prevention assembly, an
spheric-type vacuum breakers shall conform to ASSE atmospheric vent, an atmospheric-type vacuum breaker, a
1001 or CSA B64.1.1. Hose-connection vacuum breakers pressure-type vacuum breaker assembly or a hose connection
shall conform to ASSE 1011, ASSE 1019, ASSE 1035, backflow preventer.
ASSE 1052, CSA B64.2, CSA B64.2.1, CSA B64.2.1.1, P2902.4.1 Fill valves. Flush tanks shall be equipped with
CSA B64.2.2 or CSA B64.7. Both types of vacuum break- an antisiphon fill valve conforming to ASSE 1002/
ers shall be installed with the outlet continuously open to ASME A112.1002/CSA B125.12 or CSA B125.3. The
the atmosphere. The critical level of the atmospheric vac- critical level of the fill valve shall be located not less than
uum breaker shall be set at not less than 6 inches (152
1 inch (25 mm) above the top of the flush tank overflow
pipe.

632 2018 INTERNATIONAL RESIDENTIAL CODE ®
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