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Sewer Line, What is it and how does it work?

Oct 30

Sewage pipes from your home to the main branch of your municipal sewer line are referred to as laterals. An appropriately laid out and slanted trench is usually utilized for this kind of pipe installation that is 4 inches in diameter. The installation of a sewer lateral involves five primary steps. Local code inspections are necessary for every installation detail to be approved before installation by sewer pipe installation in Bridgeport.


Calculate the Altitudes

First and foremost, the length, as well as the elevation (depth) of a sewer pipe, are the most important aspects to take into account during the construction process. An ordinary sewer pipe is usually known as the "main drain" pipe at the base of a dwelling. The line descends into a point that is known as the tap and then connects to the main branch or city branch. A laser level, GPS, or classic surveying equipment is utilized to determine and lay down elevations.


Calculate the Gradient

The length and altitude of the pipe are used to calculate the initial slope. You can calculate the total elevation drop by subtracting the final elevation from the elevation at which you started. Divide the length of the pipe by the drop to calculate the slope.


The slope is 2 feet when the pipe begins at the house with a depth of 4 feet and connects to the mainline of the city at 6 feet. This is the slope of the 80-foot pipe.


Two-hundred and Twenty-five Percent (0.025)


In most places, a lateral's specified minimum slope should be 2 percent or 2 feet of descent for every 100 feet of distance. More steep slopes are accepted if they comply with the local building codes. Since liquids are more mobile than solids, a steep slope can lead to obstructions. A shallow slope can result in inadequate drainage due to the velocity of liquids.


Find the pit and place the Bedding.


To avoid soil disturbance the lateral sewer trench must be excavated with care. To stop soil from settling, soil that has been disturbed must be compacted. A small trench is ideal in most cases; however, precise information on where the pipe's end is necessary. A more deep trench is necessary.


The trench should have a smooth, compacted bottom and the necessary slope. The bedding material, like sand, is usually put in the trench to ensure long-term stability. Furthermore, because sand is more slope-friendly than dirt, the pipe can be installed in the trench with the slope already adjusted.


Set up the Tube


With fittings that are gasketed or solvent glue, modern PVC sewer pipes are linked. 4-inch pipes are the norm for domestic water lines. The municipal code defines the type of pipe and the required dimensions.


Each pipe segment must be fitted with its bell (female end) upward to minimize the risk of leaks at the junction. By city regulations, the pipe is linked to the mainline in the city. A lot of codes at the home end require only two or three cleanouts to ensure that sewer augers can clean out the pipes.

Fill in the Diggings


When the sewer lateral is completed and has passed the final inspection, the trench can be backfilled. It is normal to use a layer of sand for the initial layer of backfilling. This helps protect the pipe and fill in any gaps. The trench then gets filled with soil layers. It is hoped that the soil will not get buried in the near future.


In the initial layer of compacted dirt, warning tape should always be placed. Crews will be alerted to any excavations occurring in the area.

Unlimited Excavation and Construction

688 N Washington Ave, Bridgeport, CT 06604

(860) 499-4998