15.26.180 IMC Chapter 3, Section 307.2.2 Drain pipe materials and sizes–Amended.
   IMC Chapter 3, Section 307.2.2 Drain pipe materials and sizes is hereby amended to read in its entirety as follows:
   307.2.2 Drain pipe materials and sizes. Components of the condensate disposal system shall be cast iron, galvanized steel, copper, copper alloy, cross-linked polyethylene, polyethylene, ABS, CPVC, PVC, or polypropylene pipe or tubing. Components shall be selected for the pressure and temperature rating of the installation. Joints and connections shall be made in accordance with the applicable provisions of the current Plumbing Code adopted by the City of Rapid City relative to the material type. Condensate waste and drain line size shall be not less than 3/4-inch internal diameter and shall not decrease in size from the drain pan connection to the place of condensate disposal. Where the drain pipes from more than one unit are manifolded together for condensate drainage, the pipe or tubing shall be sized in accordance with Table 307.2.2.
TABLE 307.2.2
CONDENSATE DRAIN SIZING
 
EQUIPMENT CAPACITY
MINIMUM CONDENSATE
PIPE DIAMETER
Up to 20 tons of refrigeration
3/4 inch
Over 20 tons to 40 tons of refrigeration
1 inch
Over 40 tons to 90 tons of refrigeration
1 1/4 inch
Over 90 tons to 125 tons of refrigeration
1 1/2 inch
Over 125 tons to 250 tons of refrigeration
2 inch
1 inch = 25.4 mm, 1 ton = 3.517 kW.
 
(Ord. 6265 (part), 2019)