A.
The drainage system of each new building and of new
work installed in an existing building shall be separate from and
independent of that of any other building, except as provided below,
and every building shall have an independent connection with a public
or private sewer when available.
B.
Where one building stands in the rear of another building
on an interior lot and no private sewer is available or can be constructed
to the rear building through an adjoining alley, yard or driveway,
the house drain from the front building may be extended to the rear
building and the whole will be considered as one house drain, provided
that both buildings belong to the one owner.
Old drains may be used in connection with new buildings or new plumbing when they are found, on examination and test, to conform in all respects to the requirements governing new drains, as prescribed in this chapter. If the old work is found unsanitary, the Inspector shall notify the owner to make the necessary changes to conform to this chapter. When any building is connected to a public sewer, the provisions of § 157-82 as to size of soil and waste stack through the roof shall be complied with.
[Amended 10-13-1981]
The house sewer shall be at least four inches,
minimum diameter to the public sewer, all of service-weight cast iron,
or, if conditions require it and at the direction of the Town Plumbing
Inspector or Superintendent of Buildings, extra-heavy-weight cast
iron, and located not less than 30 inches from the top of the pipe
to grade or, as an alternative, shall be of asbestos-cement pipe,
designed by the manufacturer for sanitary sewage, of at least four
inches' minimum diameter to the public sewer, with the joints made
with a collar, the ends of which shall be tightly sealed with rubber
rings or a sewer joint compound, and located not less than 30 inches
from the top of the pipe to grade. House sewers to private sewage
disposal plants shall be of similar specifications and shall be similarly
installed, except that they shall be located not less than 10 inches
from the top of the pipe to grade. When the ground is made or filled
or when there is danger of settlement due to frost or any other cause,
the house sewer shall be provided with masonry supports under each
hub or length. A masonry cradle shall be provided in all cases under
the house sewer, two feet from the public sewer or private sewage
disposal plant.
When a sewer is not available, drainpipes from the building shall be connected with a private sewage disposal system as set forth hereinabove in § 157-18.
A.
Each system of piping shall be laid in a separate
trench, except that drainage trenches may be benched not less than
18 inches for other usage lighter piping, if not in violation of any
town regulation prescribed for their installation. Where two tight-joint
systems of drainage occur together, they may be laid side by side
in one trench.
B.
Tunneling for distances not greater than six feet
will be permissible when specially approved by the Inspector in yards,
courts, driveways or similar locations of a building site. The foundation
on which a pipe is laid in a trench shall be of good, firm earth or
other approved secure bearing for the pipe, and all underground pipe
shall be carefully backfilled and thoroughly tamped. When pipes are
driven, the drive pipe shall be at least one size larger than the
pipe to be laid.
C.
All trenches and tunnels for house drains shall be
kept open until the piping has been inspected, tested and approved.
Trenches shall be only of sufficient width to permit best working
conditions.
[Amended 10-13-1981]
A.
The house drain when underground shall be of service-weight
cast iron or, when necessary and at the direction of the town Plumbing
Inspector or Superintendent of Buildings, extra-heavy-weight cast
iron.
B.
The house drain, when above ground, shall be of service
weight cast iron, galvanized wrought iron, steel or brass, according
to approved standards, and shall consist of a four-inch cleanout Y
at the front wall, a house trap with two cleanouts and a four-inch
fresh-air inlet which shall be extended to the outer air through the
wall of the building with a perforated fresh air plate or a return
bend not less than 12 inches above grade.
No underground house drain shall be laid parallel
to or within three feet of any bearing or at a depth below footings
which might be thereby weakened.
The required size of sanitary house drains and
sewers and horizontal branches shall be determined on the basis of
the total number of fixture units drained by them in accordance with
Table No. 4 given below and to which reference is hereby made.
|
Table No. 4
Sanitary System Only
(For house sewers, see minimum requirements § 157-98.)
| |||
|---|---|---|---|
|
Maximum Number of Fixture Units
| |||
|
Diameter of Pipe
(inches)
|
Slope 1/8-Inch Fall to 1 Foot
|
Slope 1/4-Inch Fall to 1 Foot
|
Slope 1/2-Inch Fall to 1 Foot
|
|
1 1/2
|
2
|
2
|
3
|
|
2
|
5
|
6*
|
8*
|
|
3
|
15
|
18
|
21
|
|
4
|
84
|
96
|
114
|
|
5
|
162
|
216
|
264
|
|
6
|
300
|
450
|
600
|
|
8
|
990
|
1,392
|
2,220
|
|
NOTES:
* No water closet shall discharge into a drainpipe
less than three inches in diameter.
|
In all buildings in which the whole or part
of the house drainage and plumbing system thereof lies below the crown
level of the main sewer, sewage or house wastes shall be lifted by
approved artificial means and discharged into the house sewer.
All house drains below sewer level shall discharge
into a watertight sump or receiving tank so located as to receive
the sewage by gravity, from which sump or receiving tank the sewage
shall be lifted and discharged into the house sewer by pumps, compressed
air or any equally efficient method. Such sumps shall be either automatically
discharged or be of sufficient capacity to receive the house sewage
and wastes for not less than 24 hours.
The vent pipe to any soil or waste pipe leading
to an ejector or other appliance for raising sewage or other waste
matter to the street shall be extended to full size through the roof
independently from the vent pipes to the gravity drainage system;
individual back vents from fixtures discharging to an ejector shall
constitute a separate vent system. The ejector system house main drain
trap and pot vent shall be separately vented in a manner approved
by the Inspector.
