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Section 706 Connections Betweendrainage Piping and Fittings

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706.1 Connections and Changes in Direction
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 405.
706.2 Obstructions
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 be applicable to tubular waste fittings used to convey vertical flow upstream of the trap seal liquid level of a fixture trap.
706.3 Installation of Fittings
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 706.3. Change in direction by combination fittings, side inlets or increasers shall be installed in accordance with Table 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.
Exception: Back-to-back water closet connections to double sanitary tees shall be permitted where the horizontal developed length between the outlet of the water closet and the connection to the double sanitary tee pattern is 18 inches (457 mm) or greater.
FITTINGS FOR CHANGE IN DIRECTION
TYPE OF FITTING
PATTERN
CHANGE IN DIRECTION
Horizontal to
vertical
Vertical to
horizontal
Horizontal to
horizontal
Sixteenth bendXXX
Eighth bendXXX
Sixth bendXXX
Quarter bendXXaXa
Short sweepXXa,bXa
Long sweepXXX
Sanitary teeXc
WyeXXX
Combination wyeand eighth bendXXX
For SI: 1 inch = 25.4 mm.
  1. The fittings shall only be permitted for a 2-inch or smaller fixture drain.
  2. Three inches or larger.
  3. For a limitation on double sanitary tees, see Section 706.3.
706.4 Heel- or Side-Inlet Quarter Bends
Heel-inlet quarter bends shall be an acceptable means of connection, except where the quarter bend serves a water closet. A low-heel inlet shall not be used as a wet-vented connection. Side-inlet quarter bends shall be an acceptable means of connection for drainage, wet venting and stack venting arrangements.

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