Louisiana Administrative Code
Title 51 - PUBLIC HEALTH-SANITARY CODE
Part XIV - Plumbing
Chapter 9 - Vents
Section XIV-911 - Bar and Fountain Sink Traps

A. Traps serving sinks which are part of the equipment of island bars, island soda fountains, island counters and similar equipment need not be conventionally vented when the location and construction of such bars, soda fountains and counters make it impossible to do so. When these conditions exist, traps which are roughed in above the floor shall be vented by extending the vent as high as possible, but not less than the drainboard height and then returning it downward and connecting it to the horizontal sink drain immediately downstream from the vertical fixture drain. The return vent shall be connected to the horizontal branch through a wye-branch fitting and shall, in addition, be provided with a foot vent taken off the vertical fixture vent by means of a wye-branch immediately below the floor and extending to the nearest partition and then through the roof to the open air or may be connected to other vents at a point not less than 6 inches (152 mm) above the flood-level rim of the fixtures served. Vent pipes installed less than 6 inches above the flood-level rim of the sink shall be installed with approved drainage fittings in accordance with §903. E.1 of this code and a minimum slope of 1/4 inch per foot back to the drain shall be maintained. The return bend used under the drainboard shall be a 45-degree, a 90-degree and a 45-degree elbow in the order named. Pipe sizing shall be as elsewhere in this code. The island sink drain, upstream of the returned vent, shall serve no other fixtures. An accessible cleanout shall be installed on the vertical vent pipe under the drainboard and another cleanout should be installed in the vertical portion of the foot vent. (The cleanout recommended on the vertical portion of the foot vent shall be located at least 6 inches above the flood level rim of the sink but not more than 4 feet above the finish floor. Preferably, the vertical portion of the foot vent and its recommended cleanout shall be located on an outside wall with the cleanout accessible outside or, if this is not possible, behind a refrigerator, for example, such that the cleanout access is not aesthetically objectionable to the occupants.) For food service establishments, drainage shall be in accordance with §807. A of this code (see Figure 911.A of this code below).

Click Here To View Image