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Prior Chicago Building Code
BUILDING CODE AND RELATED EXCERPTS OF THE MUNICIPAL CODE OF CHICAGO
DIVISION 1 - ADMINISTRATION
DIVISION 2 - DEFINITIONS
DIVISION 3 - USE AND OCCUPANCY CLASSIFICATIONS
DIVISION 4 - SPECIAL DETAILED REQUIREMENTS BASED ON USE AND OCCUPANCY
DIVISION 5 - GENERAL BUILDING HEIGHTS AND AREAS
DIVISION 6 - TYPES OF CONSTRUCTION
DIVISION 7 - FIRE-RESISTANCE-RATED CONSTRUCTION
DIVISION 8 - INTERIOR FINISHES (NA)
DIVISION 9 - FIRE PROTECTION SYSTEMS
DIVISION 10 - MEANS OF EGRESS
DIVISION 11 - ACCESSIBILITY
DIVISION 12 - INTERIOR ENVIRONMENT
DIVISION 13 - ENERGY EFFICIENCY AND ENVIRONMENTAL PROTECTION
DIVISION 14 - EXTERIOR WALLS (NA)
DIVISION 15 - ROOF ASSEMBLIES AND ROOFTOP STRUCTURES (NA)
DIVISION 16 - STRUCTURAL DESIGN
DIVISION 17 - STRUCTURAL TESTS AND SPECIAL INSPECTIONS
DIVISION 18 - SOILS AND FOUNDATIONS
DIVISION 19 - CONCRETE
DIVISION 20 - ALUMINUM (NA)
DIVISION 21 - MASONRY
DIVISION 22 - STEEL
DIVISION 23 - WOOD
DIVISION 24 - GLASS AND GLAZING (NA)
DIVISION 25 - GYPSUM BOARD AND PLASTER (NA)
DIVISION 26 - PLASTIC (NA)
DIVISION 27 - ELECTRICAL
DIVISION 28 - MECHANICAL SYSTEMS
DIVISION 29 - PLUMBING SYSTEMS
CHAPTER 18-29 PLUMBING*
Article 1. Administration (18-29-101 et seq.)
Article 2. Definitions (18-29-201 et seq.)
Article 3. General Regulations (18-29-301 et seq.)
Article 4. Fixtures, Faucets and Fixture Fittings (18-29-401 et seq.)
Article 5. Water Heaters (18-29-501 et seq.)
Article 6. Water Supply and Distribution (18-29-601 et seq.)
Article 7. Sanitary Drainage (18-29-701 et seq.)
Article 8. Indirect/Special Waste (18-29-801 et seq.)
Article 9. Vents (18-29-901 et seq.)
Article 10. Traps, Separators and Interceptors (18-29-1001 et seq.)
Article 11. Storm Drainage (18-29-1101 et seq.)
Article 12. Swimming Pools (18-29-1200 et seq.)
Article 13. Referenced Standards
DIVISION 30 - ELEVATORS AND CONVEYING SYSTEMS
DIVISION 31 - SPECIAL CONSTRUCTION (NA)
DIVISION 32 - ENCROACHMENTS INTO THE PUBLIC RIGHT-OF-WAY
DIVISION 33 - SAFEGUARDS DURING CONSTRUCTION
DIVISION 34 - EXISTING STRUCTURES
DIVISION 35 - REFERENCED STANDARDS

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18-29-504.7.1  Discharge.
   The discharge from the relief valve shall be piped separately to an indirect waste receptor located inside the building. The discharge shall be piped full size and installed in a manner that does not cause personal injury or property damage and that is readily observable by the building occupants. The discharge from a relief valve shall not be trapped. The diameter of the discharge piping shall not be less than the diameter of the relief valve outlet. The discharge pipe shall be installed so as to drain by gravity flow and shall terminate atmospherically not more than 6 inches (150 mm) above the floor. The end of the discharge pipe shall not be threaded.
18-29-504.7.2  Location.
   The relief outlet discharge piping shall be installed so that it does not leave the room or enclosure in which the water heater and relief valve are located.
18-29-504.7.3  Materials.
   Relief valve discharge piping shall be of those materials listed in Section 18-29-605.5 for water distribution piping or shall be tested, rated and approved for such use in accordance with ASME A112.4.1. Piping from safety pan drains shall be of those materials listed in Table 18-29-605.5.
18-29-504.8  Required pan.
   Water heaters or hot water storage tanks installed in locations where leakage of the tanks or connections will cause damage shall be installed in a galvanized steel or other metal pan of equal corrosion resistance having a minimum thickness of 24 gauge, 0.0276 inch (0.70 mm) Any water heater installed in a cabinet below a counter shall be provided with a drain pan.
(Amend Coun. J. 3-27-02, p. 82090, § 3)
18-29-504.8.1  Pan size and drain.
   The pan shall not be less than 1 1/2 inches (40 mm) deep and shall be of sufficient size and shape to receive all dripping or condensate from the tank or water heater. The pan shall be drained by an indirect waste pipe having a minimum diameter of 1 inch (25 mm) or the outlet diameter of the required relief valve, whichever is larger.
18-29-504.8.2  Pan drain termination.
   The pan drain shall extend full-size and terminate over a suitably located indirect waste receptor or floor drain.
18-29-505  Insulation.
18-29-505.1  Unfired vessel insulation.
   Unfired hot water storage tanks shall be insulated so that heat loss is limited to a maximum of 15 British thermal units per hour (Btu/h) per square foot (47 W/m 2 ) of external tank surface area. For purposes of determining this heat loss, the design ambient temperature shall not be higher than 65°F (18.3°C). Any ASME stamp or other required indication markings shall remain exposed.
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