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Pipe Installation How to Install a Sewer Pipe
#1
How to Install a Sewer Pipe




Pipe installation
sould be done carefully with the adequate slope. No matter if the pipe
is going to be installed inside of a structure or outside, the installation method will be the same. Depending on the sewer pipe material, things could be easier or more complicated, because the pipe will be harder to handle and the installation process of the sewer pipe will require additional labor and equipment.
To start, you must determine how far the
pipe needs to go, and determine the elevation at which the pipe will be
connected to the specific fixture or if it will be connected to another
pipe. Another important information is to determine what will be the
final installation height. Both, initial and final elevation must be
measured at the interior point of the connecting pipe, just in the
middle portion of the pipe.
Now that you have both elevations and the pipe length, we need to calculate the pitch or fall of the sewer pipe
run. Subtract both elevation and divide the horizontal or pipe length
into the difference in elevation, and that will be the drop per linear
foot or meters of pipe. Be careful, a drop greater than ¼” per foot is
not adequate as water will flow faster than solids, while a slope to
small, less than 0.003, will be sufficient to carry solids away. The
recommended pitch for 4" pipe is 1/8" to 1/4" per foot.
Start by opening the trench. Be careful
once the trench is open and provide all safety measures to protect
workers inside and outside the trench. Remove all loose dirt at the
trench bottom and grade the trench bottom so the pipe could be installed
over a smooth surface. Sometime you will need to place a bedding
material to provide additional support to the sewer pipe, to reduce the
possibility of ‘sag’ after the trench has been backfilled. The best
material to use as bedding material is sand, but if unavailable then you
can choose to place gravel bedding.
Once the select portion of trench has been prepared, lay the sewer pipe in the trench. It is recommended to start at the lower end of the pipe run, up to the higher elevation.
If the sewer pipes,
has bell end; the bell end must be placed on the uphill side of the
pipe run, reducing the possibility of leakage. Remember that before
applying glue to the sewer PVC pipes, you must apply purple PVC primer. PurplePVC primer chemically cleans the PVC surface,
so the glue acts properly. Insert the male end of the pipe into the
female end and twist a little bit. To be sure that the pitch is being
followed correctly, install a string along the pipe run. The string must
be installed with the same slope as the pipe will be, but just one feet
over the finished level. The measure from the string to the bottom of
the trench will be the same along the entire run.
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