Sec. 16. Diameter of Soil Pipe.—The smallest diameter of soil pipe permitted to be used shall be 4 inches. The size of soil pipes must not be less than those set forth in the following tables.
Maximum number of fixtures connected to:
| Size of pipe | Waste and soil combined | Soil pipe alone | ||
|---|---|---|---|---|
| Branch fixtures | Main fixtures | Branch water closets | Main water closets | |
| 4-inch | 48 | 96 | 8 | 16 |
| 4.5-inch | 96 | 192 | 16 | 32 |
| 6-inch | 268 | 336 | 34 | 68 |
If the building is six (6) and less than twelve (12) stories in height, the diameter shall not be less than 5 inches. If more than twelve (12) it shall be 6 inches, in diameter. A building six (6) or more stories in height, with fixtures located below the sixth floor, soil pipe 4 inches in diameter will be allowed to extend through the roof provided the number of fixtures does not exceed the number given in the table. All soil pipes must extend at least 2 feet above the highest window, and must not be reduced in size. Traps will not be permitted on main, vertical, soil or waste-pipe lines. Each house must have a separate line of soil and vent pipes. No soil or waste line shall be constructed on the outside of a building.
Fixtures with:
- 1–11⁄4-inch traps count as one fixture.
- 1–11⁄2"traps count as one fixture.
- 1–2"traps count as two fixtures.
- 1–21⁄2"traps count as three fixtures.
- 1–3"traps (water closets) count as four fixtures.
- 1–4"traps count as five fixtures.
Sec. 17. Change in Direction.—All sewer, soil, and waste pipes must be as direct as possible. Changes in direction must be made with "Y"- or half "Y"-branches or one-eighth bends. Offsets in soil or waste pipes will not be permitted when they can be avoided, nor, in any case unless suitable provision is made to prevent the accumulation of rust or other obstruction. Offsets must be made with fourth degree bends or similar fittings. The use of T "Y"s (sanitary Ts) will be permitted on upright lines only.
Sec. 18. Joints on Soil and Waste Pipes.—Connection on lead and cast-iron pipe shall be made with brass sleeve or ferrule, of the same size as the lead pipe inserted in the hub of the iron pipe, and caulked with lead. The lead must be attached to the ferrule by means of a wiped joint. Joints between lead and wrought-iron pipes must be made with brass nipple, of same size as lead pipe. The lead pipe must be attached to the brass nipple by means of a wiped joint. All connections of lead waste pipes must be made by means of wiped joints.
Short nipples on wrought-iron and steel pipes must be of thickness and weight known as "extra heavy" or "extra strong."
Brass ferrules must be best quality, extra heavy cast brass, not less than 4 inches long and 21⁄4, 31⁄2 and 41⁄2 inches in diameter and not less than the following weights: