|PIPING MATERIAL||MAXIMUM HORIZONTAL SPACING (feet)||MAXIMUM VERTICAL SPACING (feet)|
|Acrylonitrile butadiene styrene (ABS) pipe||4||10b|
|Chlorinated polyvinyl chloride (CPVC) pipe and tubing, 1 inch and smaller||3||10b|
|Chlorinated polyvinyl chloride (CPVC) pipe and tubing, 11/4 inches and larger||4||10b|
|Copper or copper-alloy pipe||12||10|
|Copper or copper-alloy tubing, 11/4-inch diameter and smaller||6||10|
|Copper or copper-alloy tubing, 11/2-inch diameter and larger||10||10|
|Cross-linked polyethylene (PEX) pipe, 1 inch and smaller||2.67 (32 inches)||10b|
|Cross-linked polyethylene (PEX) pipe, 11/4 inches and larger||4||10b|
|Cross-linked polyethylene/aluminum/cross-linked polyethylene (PEX-AL-PEX) pipe||2.67 (32 inches)||4|
|Polyethylene/aluminum/polyethylene (PE-AL-PE) pipe||2.67 (32 inches)||4|
|Polyethylene of raised temperature (PE-RT) pipe, 1 inch and smaller||2.67 (32 inches)||10b|
|Polyethylene of raised temperature (PE-RT) pipe, 11/4 inches and larger||4||10b|
|Polypropylene (PP) pipe or tubing, 1 inch and smaller||2.67 (32 inches)||10b|
|Polypropylene (PP) pipe or tubing, 11/4 inches and larger||4||10b|
|Polyvinyl chloride (PVC) pipe||4||10b|
|Stainless steel drainage systems||10||10b|
- The maximum horizontal spacing of cast-iron pipe hangers shall be increased to 10 feet where 10-foot lengths of pipe are installed.
- For sizes 2 inches and smaller, a guide shall be installed midway between required vertical supports. Such guides shall prevent pipe movement in a direction perpendicular to the axis of the pipe.
- Water service pipes.
- Pump seals in individual water supply systems where the pump is located below the design flood elevation.
- Covers on potable water wells shall be sealed, except where the top of the casing well or pipe sleeve is elevated to not less than 1 foot (305 mm) above the design flood elevation.
- Sanitary drainage piping.
- Storm drainage piping.
- Manhole covers shall be sealed, except where elevated to or above the design flood elevation.
- Other plumbing fixtures, faucets, fixture fittings, piping systems and equipment.
- Water heaters.
- Vents and vent systems.
- Tests requiring a pressure of 10 pounds per square inch (psi) (69 kPa) or less shall utilize a testing gauge having increments of 0.10 psi (0.69 kPa) or less.
- Tests requiring a pressure of greater than 10 psi (69 kPa) but less than or equal to 100 psi (689 kPa) shall utilize a testing gauge having increments of 1 psi (6.9 kPa) or less.
- Tests requiring a pressure of greater than 100 psi (689 kPa) shall utilize a testing gauge having increments of 2 psi (14 kPa) or less.
|EQUIPMENT CAPACITY||MINIMUM CONDENSATE PIPE DIAMETER (inch)|
|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||11/4 inches|
|Over 90 tons to 125 tons of refrigeration||11/2 inches|
|Over 125 tons to 250 tons of refrigeration||2 inches|
- An auxiliary drain pan with a separate drain shall be provided under the coils on which condensation will occur. The auxiliary pan drain shall discharge to a conspicuous point of disposal to alert occupants in the event of a stoppage of the primary drain. The pan shall have a depth of not less than 11/2 inches (38 mm), shall be not less than 3 inches (76 mm) larger than the unit or the coil dimensions in width and length, and shall be constructed of corrosion-resistant material. Galvanized sheet metal pans shall have a thickness of not less than 0.0236-inch (0.6010 mm) (No. 24 gage) galvanized sheet metal. Nonmetallic pans shall have a thickness of not less than 0.0625 inch (1.6 mm).
- A separate overflow drain line shall be connected to the drain pan provided with the equipment. Such overflow drain shall discharge to a conspicuous point of disposal to alert occupants in the event of a stoppage of the primary drain. The overflow drain line shall connect to the drain pan at a higher level than the primary drain connection.
- An auxiliary drain pan without a separate drain line shall be provided under the coils on which condensate will occur. Such pan shall be equipped with a water-level detection device conforming to UL 508 that will shut off the equipment served prior to overflow of the pan. The auxiliary drain pan shall be constructed in accordance with Item 1 of this section.
- A water-level detection device conforming to UL 508 shall be provided that will shut off the equipment served in the event that the primary drain is blocked. The device shall be installed in the primary drain line, the overflow drain line or in the equipment-supplied drain pan, located at a point higher than the primary drain line connection and below the overflow rim of such pan.