What is the slope of the sewer pipe should be

In the design and subsequent installation of the sewer system, you need to know about the correct inclination of the sewer pipe. The system is gravity, drains move through the pipes under the influence of gravity. Failure to choose the inclination of the pipe can lead to a malfunction of the sewer system. What slope of the sewer pipe should be and how to choose it correctly - you will learn about this by reading the article.

Not many Russians can afford pressure sewers in private construction. When drafting a free-flow sewage system, the main thing is to correctly calculate the angle at which the sewage pipes should be mounted. Errors are fraught with system failure, and even the impossibility of its use.

How does the sewage system

The network of pipes that diverts sewage from sanitary devices to the treatment plant forms a sewage system. Unlike measuring various angles in degrees, the slope of a sewer pipe is defined in cm per meter of pipe.

Water does not flow up the hill, so the pipeline is mounted under a slope, and the drains move by gravity through the pipes. It would seem that the conclusion suggests itself: the greater the bias, the better, but this is not the case. Sewage drains have various inclusions: garbage, grease, pieces of food. If all this settles in the pipe, then over time the passage will be completely clogged and the water will not be able to go to the treatment plant. The system will work fine if you select the optimal speed of the wastewater flow through the sewer pipes, and it is regulated by the angle of the pipe. The speed of 1 m / s is optimal for the fluid in the non-pressure sewer system. At this speed, the water will wash away all sewage in a septic tank. The sewage system will self-clean, and blockages can occur only in extraordinary cases. You will not need to constantly fight them.

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

The slope of the free-flow sewage system is made large, but then various problems may arise:

• the speed of the water will be great, it just does not have time to wash away the solids and impure;
• a large inclination of the pipe can lead to disruptions of the water gates during discharge, and this will lead to the appearance of a specific smell of sewage into the room.

Slope calculation

The slope of the sewer pipeline 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 of the slide is 4 cm per meter of sewer pipe. The pipeline length is 4 m, which means that its lower point is 16 cm below the upper one (4x4 = 16).

To determine the optimal slope of the pipeline in the room will help calculate the degree of filling the pipe. Do not go into mathematical calculations. The filling capacity for smooth plastic pipes is 0.5, and for pipes with a rough uneven surface is 0.6.

These pipe filling indicators allow fluid to move through sewer pipes at optimum speed.

Ramp values

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

• pipe section 50 mm, inclination angle 0.03;
• pipe section 85-100 mm, inclination angle 0.02.

Standards bends for sanitary devices

• washbasin, removal of pipes is made diameter, which equals to 40-50 mm with a tilt angle 0, 025-0.035;
• toilet bowl, pipe with a cross-section of 100 mm is used for removal, tilt 0, 012-0.02

When installing free-flow sewage, the choice of inclination of pipes located outside the building plays an important role. Typically, these pipes have a larger diameter than the pipes of the house sewer. When installing pipes with a cross section of 150 mm, observe the inclination angle of 0.008; in exceptional cases, 0.007. If you use a pipe of 200 mm cross section for external installation of sewage, their optimum inclination will be 0.007 and the minimum 0.055.

The maximum permissible angle of inclination of the external sewage pipes is 0, 15. This means that the sewage system cannot work effectively if the inclination of the external pipes exceeds 15 cm per meter of its length.

Select the correct slope - a guarantee of efficient operation of the free-flow sewer system. In case of violation of the norms of calculation and installation, the high-quality operation of the system is impossible, it will constantly form blockages.

When installing the sewage on your own, strictly adhere to all rules and regulations, if you hired workers, then make sure that they strictly follow them, then you will have a perfectly functioning sewer system in your house.

Video

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