What slope of the sewer pipe should to be

Slope of the sewer pipe Table of contents:

  • 1 How the sewage system works
  • 2 Tilt calculation
  • 3 Norms of bias values
  • 4 videos

In the design and subsequent installation of the sewer system You need to know about the correct slope of the sewer pipe. System is gravity, drains move through pipes under the influence of force gravity. An error when choosing the pipe angle can result in improper operation of the sewer system. What bias there should be a sewer pipe and how to choose it correctly – about You will learn this by reading the article.

Pressure sewer in private construction can afford not many Russians allow. When drafting a pressure-free project sewer, the main thing is to correctly calculate at what angle it is necessary to mount sewer pipes. Errors are fraught with malfunctions system, or even the impossibility of its use.

How is the sewage system

Home sewage systemHome system sewers

A pipe network that discharges sewage from plumbing fixtures to a sewage treatment plant facilities – forms a sewage system. Unlike measurement different angles in degrees, the slope of the sewer pipe is determined in cm per meter pipe.

Water does not flow uphill, so the pipeline is mounted under slope, and drains move by gravity through the pipes. It would seem that, the conclusion suggests itself, the greater the bias, the better, but it’s not so. Sewer drains have various inclusions: garbage, grease, pieces of food. If all this settles in the pipe, then over time the passage completely clogged and water will not be able to go to the treatment plant. The system will work fine if you choose the best the speed of movement of sewage through sewer pipes, and she adjustable by the angle of the pipe. The speed of 1 m / s is optimum for liquid in a pressureless sewer system. At at this speed, water will wash all sewage into the septic tank. System sewers will self-clean, and blockages can only occur in extraordinary cases. You don’t have to be with them constantly fight.

Not enough biasInsufficient bias

The slope of the pipe is made insufficient, what happens in this case? Water will not be able to wash away all solids, they will precipitate and form a blockage in the sewer pipe.

The slope of the pressureless sewage system is made large, but then they can various problems arise:

  • the water speed will be great, it just does not have time to wash off the solid substances and unclean;
  • large slope of the pipe can lead to disruption of water gates during the discharge, and this will lead to the appearance of a specific smell Sewerage in the room.

Tilt calculation

Slope values ​​of sewer pipesSlope Values sewer pipes

The slope of the sewer pipe is determined in centimeters. To better understand the designation of the slope of the pipe, consider a simple example. The slope of the pipe is 0.04 cm. This means that the height the lowering is 4 cm per meter of sewer pipe. The length of the pipeline is 4 m, which means that its lower point is below top 16 cm (4×4 = 16).

Determine the optimal slope of the pipeline in the room will help calculation of the degree of filling of the pipe. Do not go deep into mathematical calculations. Fillability for smooth plastic pipes equals 0.5, and for pipes with a rough uneven surface 0.6.

These pipe fill rates allow fluid to move. through sewer pipes with optimal speed.

Slope Values

Slope of sewer pipesSlope of sewer pipes

The slope of the pipeline depends on the diameter of the pipe. There are norms pipe slope:

  • pipe cross section 50 mm, tilt angle 0.03;
  • the cross section of the pipe is 85-100 mm, the angle of inclination is 0.02.

Bends for plumbing fixtures

  • washbasin, tap is made with pipes of diameter equal to 40-50 mm with an inclination angle of 0, 025-0.035;
  • toilet bowl, a pipe with a cross-section of 100 mm is used for tap, tilt 0, 012-0.02.

Correct installation of sewer pipesCorrect pipe installation sewers

When installing a pressureless sewage system, an important role is played selection of the slope of pipes located outside the building. Usually such pipes have a larger diameter than pipes of intra-house sewage. When installing pipes with a cross section of 150 mm, observe an angle of inclination of 0, 008, in exceptional cases 0, 007. If you use to outdoor installation of sewer pipes with a cross section of 200 mm, then their optimal slope will be 0.007, and the minimum 0, 005.

The maximum permissible angle of inclination of the external sewer pipes equal to 0, 15. This means that the sewage system will not be able to work efficiently if the slope of the outer pipes exceeds 15 cm per meter of its length.

Choosing the right slope – a guarantee of efficient operation pressureless sewer system. In violation of the rules of calculation and installation, high-quality system operation is impossible, it is constantly blockages will form.

When installing the sewage system yourself, strictly adhere to all the rules and regulations, if you hired workers, then make sure that they strictly followed them, then you will have excellent in the house working sewer system.


In conclusion, we offer for informational purposes look video about the rules for laying sewer pipes:

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