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  1. Food and Beverage Handling. Commercial dishwashing machines, dishwashing sinks, pot-washing sinks, pre-rinse sinks, silverware sinks, bar sinks, soda fountain sinks, vegetable sinks, potato peelers, ice machines, steam tables, steam cookers and other similar fixtures shall have their drain lines indirectly discharged to a proper receptor. The only exception shall be when the fixtures are located adjacent to a floor drain. The waste may be directly connected on the sewer side of the floor drain trap provided that the fixture waste is trapped and vented as required by this Part (see Appendix H.Illustrations A and B), and the floor drain is located within 4 feet horizontally of the fixtures and in the same room. In the case of direct connection, no other fixture waste shall be connected between the floor drain trap and the fixture being protected. All indirect waste shall discharge to a vented trap located as close as possible to the fixture and in the same room. (See Appendix H.Illustrations C and D.)
  2. Connection. Indirect waste connections shall be provided for drains, overflows and relief valves from the water supply system. (See Appendix H.Illustration E.) A clear water waste shall discharge through an indirect waste into a sanitary or storm drain system located on the same floor.
  3. Sterile Materials. Stills, sterilizers and other appliances, fixtures, devices and water and waste connections used for preparation of sterile material shall be indirectly discharged to the drainage system.
  4. Swimming Pools. When backwash or other waste water from a swimming pool filter discharges to the sanitary waste system, it shall be indirectly wasted. When deck drains around a pool discharge to the sanitary waste system, they shall be indirectly wasted.
  5. Clear Water Wastes. Water lifts, expansion tanks, cooling jackets, sprinkler systems, drip or overflow pans, refrigerated cases, or similar devices that discharge only clear water shall discharge indirectly into a building storm drain or building drain located on the same floor, or into a vacuum waste system.
  6. Fire Sprinkler Systems. The relief valve (port) of a backflow device located on a fire sprinkler system that contains an additive shall drain indirectly to the building drain.
  7. Cleaning. Indirect waste piping shall be installed so as to permit access for flushing and cleaning.
(Source: Amended at 38 Ill. Reg. 9940, effective April 24, 2014)
Indirect waste pipe sizes shall be the same as the fixture outlets, but at least three-fourths (3/4) inch.
  1. Maximum Length. The maximum developed length of the indirect waste of any sanitary waste line shall not exceed 5 feet.
  2. Grade. Indirect waste pipes shall be installed at a uniform grade, in compliance with Section 890.1320(f), (g) and (h).
(Source: Amended at 28 Ill. Reg. 4215, effective February 18, 2004)
The air gap between an indirect waste and the drainage system shall be at least two (2) times the diameter of the fixture drain or drainage pipe served, but shall never be less than one (1) inch. For requirements in excess of this minimum, see Appendix A: Table C, and Appendix H: Illustration F.
  1. Installation. Receptors serving indirect waste pipes shall be trapped and vented and shall not be installed in any concealed, inaccessible or unventilated space, and shall be sized to prevent overflow.
  2. Strainers and Baskets. A receptor shall be equipped with either a readily removable basket over which the indirect waste pipe shall discharge or the indirect waste receptor shall be equipped with a strainer. The basket or receptor shall be constructed of approved material for the waste that will discharge into it.
  3. Splashing. All plumbing receptors receiving the discharge of indirect waste pipes shall be of such design and capacity as to prevent splashing or flooding under normal conditions. No plumbing fixtures with potable water connected to them, except service sinks, shall be used to receive the discharge of an indirect clear water waste pipe.
(Source: Amended at 28 Ill. Reg. 4215, effective February 18, 2004)
  1. Acid Wastes. Acid and chemical waste piping and fittings, including the trap, shall be of material that will not be damaged by the waste being discharged.
  2. Neutralizing Device. Corrosive liquids, spent acids, or other harmful chemicals shall not be discharged into the building sewer without first being properly diluted or neutralized.
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