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Fixture traps shall be self-scouring. Fixture traps shall not have interior partitions, except where such traps are integral with the fixture or where such traps are constructed of an approved material that is resistant to corrosion and degradation. Slip joints shall be made with an approved elastomeric gasket and shall only be installed on the trap inlet, trap outlet and within the trap seal.
The following types of traps are prohibited:
1. Traps that depend on moving parts to maintain the seal;
2. Bell traps;
3. Crown-vent traps;
4. Separate fixture traps that depend on interior partitions for the seal, except those traps constructed of an approved material that is resistant to corrosion and degradation;
5. "S" traps;
6. Drum traps;
7. Building (house) traps in sanitary sewers.
Each fixture shall have a liquid seal of not less than 2 inches (50 mm) and not more than 4 inches (100 mm), or deeper for special designs relating to accessible fixtures. Where a trap seal is subject to loss by evaporation, a deep-seal trap consisting of a 4-inch (100 mm) seal is required, or other means shall be provided to prevent loss of trap seal. Other means shall include: automatic trap seal primers conforming to ASSE 1018 or ASSE 1044, or vegetable or mineral oil added to the trap.
Fixture trap size shall be not less than the size indicated in Table 18-29-709.1. A trap shall not be larger than the drainage pipe into which the trap discharges.
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