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.
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.