Current through Register Vol. 50, No. 3, March 20, 2024
A.
Separate Trenches. The building sewer, when installed in a separate trench from
the water service pipe, shall be cast iron sewer pipe, vitrified clay sewer
pipe, or plastic piping (minimum SDR 35 or heavier). Joints shall be watertight
and rustproof and all material shall be installed according to the
manufacturer's recommendations (see §705. H of this code). All pipe and
fittings shall bear the manufacturer's name or trademark.
B. Sewer in Filled Ground. A building sewer
or building drain installed in unstable fill or unstable ground shall be of
cast iron pipe, except that nonmetallic drains may be laid upon an approved
continuous supporting system if installed in accordance with §705. A of this
code.
C. Sanitary and Storm Sewers.
Where separate systems of sanitary drainage and storm drainage are installed in
the same property, the sanitary and storm building sewers or drains may be laid
side by side in one trench.
D. Old
House Sewers and Drains. Old building sewers and building drains may be used in
connection with new building or new plumbing and drainage work only when they
are found, on examination and test, to conform in all respects to the
requirements governing new house sewers. The plumbing official shall notify the
owner to make the changes necessary to conform to this code.
E. Cleanouts on Building Sewers. Cleanouts on
building sewers shall be located as set forth in §717. B of this
code.
F. Minimum Size Building
Sewer. No building sewer shall be less than 4 inches in size with the exception
of force lines.
G. Backwater
Valves. Backwater valves shall comply with the following.
1. Fixture Branches. Backwater valves shall
be installed in the branch of the building drain which receives only the
discharge from fixtures located below grade(G). Where
fixtures are located below the level of the top of the first upstream manhole,
said fixtures shall be protected by a backwater valve.
2. Material. Backwater valves shall have all
bearing parts of corrosion resistant material. Backwater valves shall comply
with ASME A 112.14.1 or CAN/CSA B181.1, CAN/CSA B181.2.
3. Seal. Backwater valves shall be so
constructed as to insure a mechanical seal against backflow.
4. Diameter. Backwater valves, when fully
opened, shall have a capacity not less than that of the pipes in which they are
installed.
5. Location. Backwater
valves shall be so installed to be accessible for service and repair.
H. Installation of Building
Sewers. The installation of building sewers shall comply with the following.
[formerly Appendix I - Installation of Building Sewers]
1. Cast Iron Soil Pipe. Cast iron soil pipe
shall be installed in accord with the following requirements.
a. Trench Construction. Pipe shall be
installed in as narrow a trench as possible while providing sufficient width
for joint assembly.
b. Bedding.
Pipe shall be installed so that the trench bottom provides support of the pipe
barrel. Hub holes and coupling holes shall be provided.
c. Rock. When rock larger than 1 1/2 inches
(38.1 mm) in diameter is encountered during installation, it shall be removed
from the trench bottom and a 6-inch (152.4 mm) layer of selected fill shall be
added to provide uniform support.
d. Backfilling. Backfill trench following
test. When backfilling, care shall be taken to protect the pipe from large
rocks, stone, or frozen fill material which could damage the pipe.
2. Clay Pipe. Clay pipe shall be
installed in accord with the following requirements.
a. Trench and Material Preparation. The
trench and material preparation for clay pipe shall be as follows:
i. Width of trenches in which clay pipe is to
be installed shall be such as to provide adequate space for workmen to place
and joint the pipe properly.
ii.
Bell holes shall be excavated so that, after placement, only the barrel of the
pipe receives bearing pressure from the trench bottom.
iii. Preparation of the trench bottom and
placement of the pipe shall be carefully done so that, when in final position,
the pipe is true to line and
grade(S).
iv. Pipe shall be protected during handling
against impact shock and free fall. No pipe shall be used in the work which
does not conform to the appropriate ASTM standard.
b. Pipe Laying and Joining. The pipe laying
and joining of clay pipe shall be as follows:
i. The laying of pipe in finished trenches
shall be commenced at the lowest point, with the spigot ends pointing in the
direction of flow.
ii. All pipe
shall be laid with ends abutting and true to line and
grade(S). They shall be carefully
centered, so that when laid they will form a sewer with a uniform
invert.
iii. Pipe shall be set
firmly according to line and grade(S),
and, preparatory to making pipe joints, all surfaces of the portion of the pipe
to be joined shall be cleaned and dried. The joints shall then be carefully
adjusted and filled with the jointing material.
iv. Trenches shall be kept water-free during
joining and for a sufficient period thereafter to allow the jointing material
to become fully set and completely resistant to water penetration. Trenches
shall be backfilled immediately after pipe is laid therein to prevent
dislocation of the sewer line or jointing material, except when factory applied
flexible compression joints are used.
c. Testing. The clay pipe sewer line shall be
tested as required in
§319 of this code, or as prescribed by
the co-local plumbing official.
3. Plastic Pipe. Plastic pipe shall be
installed in accord with the following requirements.
a. Trenching and Supporting. The trenching
and supporting of plastic pipe shall be as follows:
i. Trenching. Excavate to desired
grade(S). Use template to detect high
spots and holes. Fill holes and depressions, tamping thoroughly.
ii. Where trenching conditions are difficult,
pipe shall be uniformly supported throughout using treated timber, concrete
pad, sand, or select backfill properly tamped.
b. Laying, Bedding and Backfilling. The
laying, bedding and backfilling of plastic pipe shall be as follows.
i. Lay the pipe line as described. Be sure
the pipe is bedded in the selected backfill one-fourth to one-third of the pipe
diameter. Under no circumstances should bricks or other supports be used to
bring pipe to grade(S).
ii. After pipe is bedded and checked for
grade(S), additional selected backfill
is placed by shovel at sides and over top of pipe and tamped. By careful
tamping at this point, the pipe can support a much greater load and is less
likely to be subsequently disturbed or shifted.
iii. Reasonably clean backfill shall be
placed 12 inches (305 mm) over the pipe.
iv. The trench may now be backfilled by any
conventional means, bulldozer, loader, etc., and the pipe is
protected.
AUTHORITY NOTE:
Promulgated in accordance with
R.S.
40:4(A)(7) and
R.S.
40:5(2)(3)(7)(9)(16)(17)(20).
