Every trap shall be self-cleaning. Traps shall
be of lead, brass, cast iron or of malleable iron, galvanized or porcelain
enameled inside. Galvanized or porcelain enameled traps shall be extra
heavy and shall have a full-bore smooth interior waterway with threads
tapped out of solid metal. All traps must be placed as near the fixture
as practicable. All waste pipe must be provided with strong metallic
strainer. No lead traps shall be used on the waste of any bathtubs.
All bathtub traps shall be made of brass.
Traps must be placed as near the fixtures as
possible and in no case shall a trap be located more than two feet
from the fixture, if within the building. Each trap shall be ventilated,
either by a special vent pipe of suitable size extending to a point
at least two feet above the highest part of the roof of the house
or into a special pipe erected for ventilating purposes only, which
vent pipe must be connected below the lowest fixture into the soil
or waste pipe. This special ventilating pipe shall be no less than
two inches in diameter when used to vent four fixtures or less, no
more than one of which shall be a water closet. For each water closet
or other fixture thereafter added, the main ventilating pipe shall
be increased correspondingly in cross-sectional area. The highest
fixture in a building, if located within two feet of the main stack,
need not be vented. Mechanical traps may be used only where they are
shown to be necessary and then only upon approval of the Division
of Health.
Each fixture trap shall have a water seal of
not less than two inches and not more than four inches. When traps
are emptied of water to prevent freezing, they must be filled with
glycerin or oil so as to preserve a perfect seal.
Each trap, except those in combination with
fixtures in which the trap seal is plainly visible and accessible,
shall be provided with an accessible brass trap screw of ample size,
protected by the water seal.
All traps shall be set true with respect to
their water seals and shall be protected from frost and evaporation.
The bodies of cleanout ferrules shall be made
of standard pipe sizes, conform in thickness to that required for
pipe and fittings of the same metal and extend not less than 1/4 inch
above the hub. The cleanout cap or plug shall be of heavy brass not
less than 1/8 inch thick and be provided with raised nut or recessed
socket for removal.
A cleanout, easily accessible, shall be provided
at the foot of each vertical waste or soil stack. There shall be at
least two cleanouts in the house drain: one at or near the base of
the stack and the other, with full-size Y-branch, inside the wall
near the connection between the house drain and house sewer. Except
for the latter, cleanouts shall be of the same nominal size as the
pipes up to four inches and not less than four inches for larger pipes.
The distance between cleanouts in horizontal soil lines shall not
exceed 50 feet.
All underground traps and cleanouts of a building,
except where cleanouts are flush with the floor, and all exterior
underground traps shall be made accessible by brick or cement manholes
with iron or brass covers.
Any floor or wall connection of fixture traps,
when bolted or screwed to the floor or wall, shall be regarded as
a cleanout.
Backwater valves shall have all bearing parts
or balls of noncorrodible metal and so constructed as to ensure a
positive mechanical seal and remain closed except when discharging
wastes.