Installation of a sewer pipe for sewerage: we do ventilation correctly

A healthy microclimate in the house consists of several factors. It would be a mistake to think that it depends only on the presence or absence of an air conditioner and a properly installed ventilation system. The most important component of the fresh atmosphere of the home is a well-mounted fan pipe. She successfully copes with odors emerging from the sewer. The presence and normal functioning of the structure guarantees the absence of the “aroma” of sewage and loud unpleasant sounds in the house when the water is drained.

The principle of operation of the fan pipe

This device is designed to provide ventilation to the sewage system. It connects the sewer pipe structure to the atmosphere or to a specially designed ventilation duct. The shape and length of the device can be arbitrary. You can find straight, bent at an angle, vertical and horizontal parts.

When arranging the sewer system, the installation of a fan pipe is most often performed - a ventilated riser. The functioning of the device prevents the smell of sewage from entering the apartment

The principle of operation of the fan pipe is quite simple. Wastewater discharged into a vertical riser creates a vacuum in the pipeline. In part, it can be compensated by water in the siphons of plumbing equipment. But with a powerful drain or a high riser height, the vacuum formed in the sewer pipe, with a characteristic "champing" sound, breaks the equipment's water seals, draining the siphons. In this case, there are no obstacles to the smell from the sewer.

In systems equipped with a fan pipe, everything happens a little differently. The vacuum created in the sewer pipeline does not have time to "suck" the water out of the siphons. This is prevented by atmospheric air, which begins to be sucked into the system simultaneously with the appearance of vacuum in it. Thus, the water seals in the plumbing equipment remain in place and successfully prevent the penetration of unpleasant sewer odors into the apartment.

When is ventilation required?

According to the norms, a sewer pipe for sewerage is mandatory installed in the following cases:

• The building has more than two residential floors, each of which is equipped with a sewerage and water supply system.
• A one-story building is equipped with a pool or has other devices that can produce one-time effluents of a significant volume.
• Sewer risers in the building have a diameter of 50 mm.

Low-rise buildings are usually erected without ventilation installation. However, it should be borne in mind that this is advisable only for small one-time flows. Determining their level is quite easy. Installation of the device will be considered necessary if the flow of wastewater can completely block the vertical riser.

The most common situation: the toilet bowl is most often installed on a pipe with a diameter of 110 mm, the outlet of the drain tank has a cross section of 70 mm and a pipeline with a diameter of 50 mm departs from the bath.

In multi-storey buildings, where water supply and sewerage are connected to each apartment, the installation of a vent pipe is necessary. The riser is displayed on the roof

It becomes clear that the simultaneous operation of one bath and one toilet will not create problems. Even if a dishwasher or a washing machine and a sink are connected to the sewer, they will not be able to seriously increase the volume of a single drain. Therefore, ventilation in this case is mounted as desired. But if several bathrooms and toilet rooms are planned in the house, it becomes impossible to do without equipment.

Ventilation must be installed not only in engineering systems, but throughout the house. How to do it right, you will learn from our article:.

Features of the installation

The installation of such a riser can be carried out independently. First of all, for this you need to purchase suitable pipes. You need to understand that the design is a direct continuation of the sewer pipeline, so the pipes from which the main system is assembled are quite suitable for it.

It should be ensured that the cross section of the element to be installed coincides with the sewer opening or is slightly larger. Practice shows that the optimal diameter of the fan pipe is 110 mm.

To ensure the pressure and temperature difference necessary to create traction, it is recommended to choose a place in a heated room for the initial section of the riser. The final section, on the contrary, must be placed in a cold one. This should be an open place, then the draft created in the pipe will freely remove unpleasant odors into the atmosphere. The actual installation of the device is extremely simple: the installation of the structure is carried out in a pre-prepared ventilation duct.

There are two practically equivalent options for the competent arrangement of a fan pipe: the removal of a ventilation riser to the roof and the installation of a check valve

Check valve system

The equipment put in place can be equipped with a special system called. It allows normal operation without the ventilation riser to the roof. In addition, the device is necessary for:

• Correction of insufficient slope of the sewer pipe.
• Prevention of ingress of mechanical impurities and rodents into the system.
• Obstacles to the return of wastewater to plumbing fixtures.

The non-return valve on the fan pipe must be installed without the use of all kinds of coatings and silicone. Surface must be clean and dry

Depending on the type of non-return valve, it can be installed outside or inside the element. The device is directed towards the movement of drains, its elements, made in the form of petals, must be curved towards the plumbing fixture. Internal installation involves thorough cleaning and subsequent degreasing of the inner surface of the pipe, where the insert will subsequently be installed. Experts strongly do not recommend using various lubricants during installation, including silicone ones, designed specifically for sewers. All installation work is carried out only on dry surfaces.

Ventilation riser for sewerage

Traditionally, the upper part of the fan pipe is brought to the roof in the form of a ventilation riser. According to the recommendations of building SNiPs, the height of the structure should be at least 0.5 m on a pitched roof, 0.3 m on a flat non-exploited surface and 3 m on an exploited roof. At the same time, the minimum distance from the riser to the opened balconies or windows horizontally must be at least 4 m. It is strictly forbidden to combine the outlet of the fan pipe with stove chimneys or ventilation.

If the house has several sewer risers at once, they can be connected with one exhaust part. In this case, the cross section of the pipe chosen for its arrangement should be equal to or greater than the diameter of the risers themselves. For most buildings, the diameter of a single exhaust part will be 110 mm. The combined exhaust elements are laid with a slight slope, about 0.02%, directed towards the movement of gases.

Bringing the device to the attic is strongly discouraged. It is also forbidden to install a vent pipe outlet directly under the roof overhang, since snow falling and sliding from the roof can easily damage it. All sorts of additional structures for the hood, such as wind vanes or deflectors installed at the outlet of the sewer riser, will not give the expected effect. On the contrary, according to experts, they provoke the appearance of condensate in the system, which is fraught with blocking of the outlets if it freezes.