# How to make the angle of inclination of the sewer pipe for external and internal sewerage? Overview and installation instructions + Video

Owners of private houses often carry out sewerage with their own hands. And when carrying out the sewer system, many nuances must be taken into account.

These details will be discussed further. Consider the angle of inclination of the sewer pipe.

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## Designing a slope

When designing or installing a gravity drainage system, pipe laying must be laid with the correct angle.

If the pipes are laid at the wrong angle, then this leads to clogging or incorrect operation of the sewage system.

### Sewer pipe slope options

Most often domestic sewers are non-pressurized, which means that wastewater flows through them by gravity, that is, under the influence of earth's gravity.

Of course, this is possible when the water has somewhere to drain. This means that the level of the drain pipe is higher than the outlet from which the waste water flows further.

Therefore, the pipeline is laid at a certain slope.

The result is the desired height difference.

It seems that the slope of the pipe can be made more, and the water will drain better, but this is not so. It must be taken into account that the wastewater has some dirt inclusions that tend to remain on the pipe walls. This dirt is removed with water, which must flow at a constant speed.

Therefore, if the slope of the pipe is too large, then the mud deposits will not be removed all or not at all.

#### Normal slope

Normal sewage water flow rate should be 0.7-1 m / s

In this case the sewer system will work for a long time without clogging. This water pressure is ensured by the correct slope of the pipes.

#### Slight slope

But if the slope of the pipes is insufficient, then the speed and pressure of the water will be low, and therefore its flow will not be able to wash away the dirt on the walls of the pipe. Hard and soft dirt particles will remain on the pipe walls and clog the pipe.

If a serious blockage occurs, then the pipes will need to be cleaned, perhaps even removed and flushed.

#### Large slope

If the slope of the pipe more, the water flow will flow too fast and therefore the water will not be able to wash away all the dirt. And as a result, there will be a blockage of the sewer pipe again.

## Calculation of the slope

As a rule, degrees are considered the measure of measurement of angles, but when installing the pipeline, according to SNiP, a measure of length is used in millimeters or even centimeters.

When you know the angle of inclination and the length of the sewer that you will lay, then you need to multiply both values.

As a result, you will get a figure. The inlet should be higher than the outlet by this number.

### In decimal fractions

In reference books and technical documentation, various manuals the slope level is indicated in decimal fractions, they are the ratio of the decrease in the level of the drainage system in meters to the length of the pipe.

For example, the angle of inclination is 0.02, this means that for every meter of the pipe there will be a decrease in height by two centimeters.

If the total length of the sewer branch is three meters, then to find out the slope of the pipe, it is necessary to multiply two by three, in the end we get that the lower point will need to be set six centimeters lower than the upper one.

### In the form of a ratio of numbers

The angle of inclination is sometimes indicated as a ratio of 1, to some number, let us give an example, 1:20. In this case, division is made and a decimal fraction is obtained.

The SNiP prescribes the normal angle of inclination of pipes for each diameter. The filling of the sewer system depends on the size of the internal section of the pipes, the pipes are installed at an angle, which is determined by the volume of water flow.

The filling capacity of smooth pipes is 0.5, and the filling capacity for cast iron pipes is 0.6. Such indicators imply that the water flow rate will be normal.

Angle of inclination for drainage pipes according to SNiP

Pipe diameter is 40, 50 mm-30 mm (3cm) per meter of pipe length;

The pipe diameter is 65-100mm -20mm (2cm);

The pipe diameter is 150mm -8mm (0.

8 or 0.08);

Pipe diameter -200mm-7mm (0.7-0.07). The smallest and acceptable slope is 0.

005.

Pipes with a diameter of 40-100 mm are suitable for domestic sewage, the normal angle of inclination will be 0.02 - 0.03. To drain water from plumbing fixtures, there are standards for each facility.

For sewer networks that are located outside, pipes with a diameter of 150 - 200 mm are suitable, the optimal and minimum angle of inclination of the sewer pipe should be 0.005 - 0.008. For external sewage systems, there is also a maximum slope of the sewer pipe, and it is 0.15.

If the angle of inclination is exceeded by more than fifteen centimeters per meter of pipe length, then the external and internal sewage systems will work poorly or will not work at all.

Before you start equipping the house with sewerage, with your own hands, then study all the subtleties well, accurately calculate the cost of materials, also count all the angles of inclination, follow the instructions to avoid unnecessary breakdowns. Of course, if you have the opportunity to better hire professionals, just choose trusted specialists. We hope you find this article helpful. Good luck and patience!

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