TITLE 77: PUBLIC HEALTH
PART 890 ILLINOIS PLUMBING CODE
CHAPTER I: DEPARTMENT OF PUBLIC HEALTH
SECTION 890.1590 COMBINATION WASTE AND VENT (FLOOR AND HUB DRAINS ONLY)
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Section 890.1590 Combination Waste and Vent (Floor and Hub Drains Only)

 

Combination Waste and Vent. A combination waste and vent is permitted only where structural conditions preclude conventional plumbing. Appurtenances delivering large quantities or surges of water shall not be discharged to a combination waste and vent.

 

a) The waste piping and trap in a combination waste and an end vented (both ends) system shall be a minimum of 4 inch diameter and in accordance with Appendix A, Tables G and H. The waste piping and trap shall be at least 2 pipe increments larger than the pipe size required by Appendix A, Tables G and H, and at least 2 pipe increments larger than any fixture/appurtenance discharge tail piece. Only one floor drain shall be connected to each branch of a combination waste and vent.

 

b) A branch more than 15 feet in length shall be separately end vented. The minimum area of any vent installed in a combination waste and vent system shall be the area of the drain pipe served.

 

c) Sinks, lavatories and other fixtures that are roughed-in above the floor shall not be permitted on a combination waste and vent system.

 

d) Long mains shall be provided with additional relief vents located at intervals of every one hundred feet. (See Appendix K: Illustration FF.)

 

(Source: Amended at 28 Ill. Reg. 4215, effective February 18, 2004)