Section 28. Every sink, bath-tub, basin, water-closet, slop-hopper, or fixtures having a waste-pipe, must be furnished with a trap, which shall be placed as close as practicable to the fixture that it serves, and in no case shall they be more than one foot from said fixture. The waste-pipe from the bath-tub or other fixtures must not be connected with a water-closet trap.
Size of Horizontal and Vertical Waste-pipe Traps and Branches:
Horizontal and Vertical.
Number of Small Fixtures.
1 1/4
inches,----------------------
1.
1 1/2
inches,----------------------
2.
2
inches,----------------------
3 to 8.
2 1/2
inches,----------------------
9 to 20.
3
inches,----------------------
21 to 44.
If building is ten (10) or more stories in height, the vertical waste-pipe shall not be less than three (3) inches in diameter. The use of wrought-iron pipe for waste-pipe two inches or less in diameter is prohibited.
The size of traps and waste branches, for a given fixture, shall be as follows:
Kind of Fixtures.
Size in Inches.
Trap.
Branch.
Water-closet, --------------------------------
3
4
Slop sink with trap combined, ----------------
3
3
Slop sink, ordinary, -------------------------
2
2
Pedestal urinal, -----------------------------
3
3
Floor drain, or wash, ------------------------
4
4
Yard drain, or catch basin, ------------------
4
4
Urinal trough, -------------------------------
2
2
Laundry traps (2 or 5), ----------------------
2
2
Combination sink and tray (for each fixture)--
1 1/2
2
Kitchen sinks (small) for dwellings, ---------
1 1/2
1 1/2
Kitchen sinks (large) hotels, restaurants, grease trap, ------------------------------
--
2
Pantry sinks, --------------------------------
1 1/2
1 1/2
Wash basin, one only, ------------------------
1 1/4
1 1/4
Bath-tubs, 4x10 inches drum trap, ------------
--
1 1/2
Shower baths, --------------------------------
1 1/2
1 1/2
Shower baths (floor), ------------------------
2
2
Sitz baths, ----------------------------------
1 1/2
1 1/2
Drinking fountains, --------------------------
1 1/4
1 1/4