No form of trap will be permitted to be used
unless it has been approved by the Superintendent of Buildings and
the Board of Plumbers.
No mason's cesspool, bell, pot bottle or D-trap
will be permitted, nor any form of trap that is not self-cleaning
nor that has an interior chamber of mechanism, nor any trap except
earthenware ones that depend upon interior partitions for a seal.
Backwater or tide valves will only be permitted when it can be shown
to the satisfaction of the Superintendent of Buildings that their
use is absolutely necessary and that they are of a type as approved
by him.
Every fixture must be separately trapped by
a water-sealing trap placed as close to the fixture outlet as possible,
and no trap shall be placed more than two feet from any fixture.
A set of not more than three washtrays may connect
with a single trap or into the trap of an adjoining sink, provided
both sink and tub waste outlets are on the same side of the waste
line and the sink is nearest the line. When so connected the waste
pipe from the washtrays must be branched in below the water seal.
The discharge from any fixture must not pass
through more than one trap before reaching the house drain.
All traps must be well supported and set true
with respect to their water levels.
All fixtures other than water closets must have
strong metallic strainers or bars over the outlets to prevent obstruction
of the waste pipe.
All exposed or accessible traps, except water
closet traps, must have brass trap screws for cleaning the trap, placed
on the inlet side or below the water level.
All iron traps for house drain, yard and other
drains and leaders must be running traps with manhole cleanouts of
the full size of the traps, when same are less than five inches. All
traps underground must be made accessible by brick manholes with proper
covers.
Overflow pipes from fixtures must in all cases
be connected on the inlet side of traps.
All earthenware traps must have approved heavy
brass floor plates properly secured to the branch soil pipe and bolted
to the trap flange, and the joint made gastight. The use of rubber
washers for floor connections is prohibited. All floor flanges must
be set in place and inspected before any water closet is set thereon.
No trap shall be placed at the foot of the main
soil and waste pipe lines.
The sizes for traps must not be less than those
in the following table:
|
Type of Fixture
|
Diameter
(inches)
| |
|---|---|---|
|
Water closets
|
4
| |
|
Slop sinks
|
3
| |
|
Kitchen sinks
|
2
| |
|
Washtrays
|
2
| |
|
Urinals
|
2
| |
|
Shower bath
|
2
| |
|
Other fixtures
|
1 1/2
| |
|
Area, floor and other drains
|
3
|
Every plunge bath shall be provided with a trap
at least four inches in diameter, the waste line from trap to bath
to be reduced to two inches in diameter and this waste to be controlled
by a gate valve. Overflow pipes, if provided, must be connected on
inlet side of trap. Except where an approved antisiphon trap is installed,
such trap must be ventilated by a separate vent line extending above
the roof, of the same size as the trap and water connection.
Every dental cuspidor must be separately trapped
by a trap of at least 1 1/2 inches in diameter, which shall be
vented except where an approved antisiphon is installed and placed
as close to the fixture as possible. The connection between trap and
cuspidor may be 3/4 inch in diameter.
A.
Required. Grease traps shall be installed in the waste
lines of restaurants, beauty parlors or any other type of business
where excessive amounts of grease or soap accumulate, as determined
by the Superintendent of Sanitation.
B.
Size. The size of such grease traps shall be set by
the Superintendent of Sanitation.
C.
Installation; inspection. Installation of grease traps
shall be in accord with the rules and regulations of the Department
of Buildings and shall be inspected by the Inspector of Plumbing.
A.
Prohibited generally. No plumbing fixtures, except
bar sinks, soda fountains, drinking fountain or washing machines,
shall be installed with an indirect waste connection to the plumbing
and drainage system.
B.
Bar sinks, soda and drinking fountains, washing machines.
The waste of every bar sink, soda fountain, drinking fountain or washing
machine, if not directly connected, must discharge over a properly
water-supplied trapped fixture, with trap vented, unless an approved
antisiphon trap is installed. The main waste lines shall be two inches
in diameter, and the branches to fixtures at least 1 1/2 inches
in diameter. Drinking fountains must be trapped and the waste line
extended through the roof. No vent connections need be provided.
Oil separators installed in any building where
volatile fluids are used must be arranged to be readily accessible.
They must not receive the discharge of any water closet, rain leader,
yard, court or area drain.
Oil separators, if discharged by gravity, must
be connected by a Y-branch fitting to the house drain behind the house
trap in such a manner that they will not interfere with the house
drain and the rest of the plumbing and drainage system. Oil separators
shall be connected by a Y-branch fitting on the sewer side of the
house trap.
No separate running trap need be provided on
the drain entering oil separators, but a separate fresh-air inlet
and vent line must be provided to keep the system of drainage controlled
by the oil separator entirely separate from the rest of plumbing and
drainage system.
The size of fresh-air inlet required by § 162-166 shall be determined by the size of the inlet connection to the oil separator, which shall be considered the same as the term "house drain" for determining the size of all fresh-air inlets, and which shall conform to the same requirements regarding the size and arrangement of terminals for fresh-air inlets as are called for in these regulations.
Vent lines for oil separators shall conform
in all respects to vent lines for plumbing fixtures, regarding the
size and arrangement.
Relief pipes for oil separators of a size at
least 1 1/2 inches in diameter must be provided. They may be
connected to a vent line when installed as a separate system or shall
be carried independently above the roof.
