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For other than Group R-2, R-3, R-4 and R-5 occupancies that are four stories or less in height above grade plane, piping to the inlet of a water heater and piping conveying water heated by a water heater shall be insulated in accordance with Section C404.4 of the Chicago Energy Conservation Code. For Groups R-2, R-3, R-4 and R-5 that are four stories or less in height above grade plane, piping to the inlet of a water heater and piping conveying water heated by a water heater shall be insulated in accordance with Section R403.5.3 of the Chicago Energy Conservation Code.
(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 27)
Mechanical expansion joints may be used where necessary to provide for expansion and contraction of piping. Access to mechanical expansion joints shall be provided. For hot water piping, the expansion function shall be provided by the flexing of the piping material with expansion loops or swing joints. The piping shall be properly anchored and installed as follows:
1. Each hot water riser shall be provided with anchors at a maximum distance of 100 feet (30.5 m) with an expansion loop of adequate length provided between such anchors.
2. Each hot water main shall be provided with anchors at a maximum distance of 100 feet (30.5 m) with an expansion loop of adequate length provided between such anchors. Offsets of 90 degrees in a horizontal main shall be of adequate length to absorb expansion by flexure.
3. Branches from mains connected to risers shall be provided with a swing joint of adequate length unless the branch is of adequate length to absorb expansion by flexure.
4. Branches from risers to fixtures shall be provided with a swing joint of adequate length unless the branch is of adequate length to absorb expansion by flexure.
(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 27)
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 18-29-608.1.
For a printer-friendly PDF version of Table 18-29-608.1, please click here.
Device | Degree of Hazard a | Application b | Applicable Standards |
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 Management requirements
High Hazard - See Contamination (Section 202) and Department of Water Management 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
(Amend Coun. J. 11-8-12, p. 38872, § 353)
Water supply pipe to plumbing fixtures, water using appliances and equipment, wall hydrants (except fire hydrants used for fire fighting) and hose bibbs shall meet the following requirements:
1. No plumbing fixture shall be installed unless the water supply enters said fixture with an air gap of twice the internal diameter of the water supply pipe but not less than 1 inch (25 mm) above the flood level rim of the fixture, except for fixtures listed in Section 18-29-423 of this article.
2. Dishwashing machine and clothes washing machine water supply pipes shall have an air gap as required for plumbing fixtures, except that dishwashing machine water supply pipes may enter through an approved atmospheric vacuum breaker located on the discharge side of the last control valve. The bottom of the vacuum breaker shall not be less than 6 inches (150 mm) above the flood level rim of the machine or related equipment.
(Amend Coun. J. 11-9-16, p. 36266, § 37)
The water supply for hospital fixtures shall be protected against backflow with a reduced pressure principle backflow preventer, an atmospheric vacuum breaker, or an air gap. Vacuum breakers for bedpan washer hoses shall not be located less than 5 feet (1525 mm) above the floor.
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