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All connections and changes in direction of the sanitary drainage system shall be made with approved drainage fittings. Connections between drainage piping and fixtures shall conform to Section 18-29-405.
The fittings shall not have ledges, shoulders or reductions capable of retarding or obstructing flow in the piping. Threaded drainage pipe fittings shall be of the recessed drainage type. This section shall not apply to tubular waste fittings used to convey vertical flow upstream of the trap seal liquid level of a fixture trap.
(Amend Coun. J. 10-14-21, p. 37722, Art. VII, § 6)
Fittings shall be installed to guide sewage and waste in the direction of flow. Change in direction shall be made by fittings installed in accordance with Table 18-29-706.3. Change in direction by combination fittings, side inlets or increasers shall be installed in accordance with Table 18-29-706.3 based on the pattern of flow created by the fitting. Double sanitary tee patterns shall not receive the discharge of back-to-back water closets and fixtures or appliances with pumping action discharge.
Type of Fitting Pattern | Change in Direction | ||
Horizontal to vertical | Vertical to horizontal | Horizontal to horizontal | |
Type of Fitting Pattern | Change in Direction | ||
Horizontal to vertical | Vertical to horizontal | Horizontal to horizontal | |
Sixteenth bend | X | X | X |
Eighth bend | X | X | X |
Sixth bend | X | X | X |
Quarter bend | X | X a | X a |
Short sweep | X | X a, b | X a |
Long sweep | X | X | X |
Sanitary tee | X c | – | – |
Wye | X | X | X |
Combination wye and eight bend | X | X | X |
For SI: 1 inch = 25.4 mm.
a. The fittings shall only be permitted for a 2-inch or smaller fixture drain.
b. Three inches and larger.
c. For a limitation on double sanitary tees, see Section 706.3.
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