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Rigid or flexible metal enclosures or pipe ducts shall be provided for soft, annealed copper tubing and used for refrigerant piping erected on the premises and containing other than Group Al or B1 refrigerants. Enclosures shall not be required for connections between condensing units and the nearest riser box(es), provided such connections do not exceed 6 feet (1829 mm) in length.
All refrigerating piping and fittings, brine piping and fittings that, during normal operation, will reach a surface temperature below the dew point of the surrounding air, and are located in spaces or areas where condensation will cause a safety hazard to the building occupants, structure, electrical equipment or any other equipment or appliances, shall be protected in an approved manner to prevent such damage.
Each cooling coil located in an air stream for which moisture may be condensed shall have a nonsweating condensate drip pan of sufficient size and depth to catch all of the condensate from the coil. Each condensate drip pan shall be provided with a drain pipe of adequate size to prevent overflow of the drip pan but in no case shall such drain be less than 3/4 inch (19.05 mm) nominal pipe size. Condensate drain piping shall discharge through an air gap into the waste receptor. The minimum air gap shall be equal to two times the internal diameter of the condensate drain piping Condensate drain piping and condenser water piping shall comply with the applicable provisions of the Building Services Piping Code, ANSI B 31.9.
Piping materials shall be as set forth in Section 18-28-1107.4.1 through 18-28-1107.4.5.
Steel pipe up to 1 1/2-inches (38.1 mm) industry pipe standard (IPS) shall be ASTM A53-1978 Grade B. Steel Pipe 2-inches (50.8 mm) (IPS) and larger shall be either ASTM A53-1978 Grade B seamless or ASTM A106-1978 Grade B seamless. ASTM Schedule 40 or heavier steel pipe shall be used where fabricated and assembled by the fusion-welded process. If fabricated and assembled by the threading process, ASTM Schedule 80 steel pipe shall be used. Threaded and flanged fittings shall be cast steel.
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