Silent sewage: principles of arrangement and installation examples

Vasily Borutsky
Checked by a specialist: Vasily Borutsky
Author: Victor Kitaev
Last update: September 2019

A significant level of discomfort is created by noise. And it is not necessary that the noise is pronounced. Even quiet, but constant sounds, for example, the flow of water in pipes, can lead to disorders of the nervous system.

Modern residential buildings create comfort for people through plumbing, heating, sewage. But this comfort is limited if noiseless sewage is not provided, as well as noise isolation of other communications.

Is there a sewage system without noise?

Technologies for the production of plastic pipes, which enjoy a high level of popularity in construction, are being consistently improved.

If products with frankly low noise reduction characteristics were produced at the first stages of production, now the situation is changing. In the market, you can increasingly see the so-called silent pipes.

What are silent sewer pipes? These are products for the production of which, along with traditional materials, materials are used that can absorb sound waves.

The structure of a silent sewer pipe is formed from several working layers:

  • polyethylene (rigid);
  • mineralized polypropylene;
  • polyvinyl chloride (soft).

According to various estimates, a three-layer sleeve with a similar structure reduces the noise level from the fluid flowing in the pipes to at least 20 dB. This value is fully consistent with European standards (DIN EN 14366).

An integral component of silent sewer pipelines are special support clamps.

Using these parts, the polymer pipes are fixed to the mounting base. The clamp itself is a simple product - a metal hoop. But with it, a soft polymer insert is used, the material of which effectively dampens mechanical vibrations.

Principles of arranging a low noise system

Of course, the silent domestic sewage does not become such only because of the replacement of ordinary trunk lines with silent pipes. This option is one of several that can be used to combat unwanted sounds.

If isolate standard sewer pipe sound-absorbing material and replace the hard supports with fasteners with a soft insert, you can already get a good result.

Considering that it is difficult and expensive to completely remake an existing sewage system, it is reasonable to limit ourselves to the creation of insulating boxes. In combination with insulating material, this approach will have a double effect.

Sleeve coupling
A mounted sewer coupling is used to connect two plastic pipes according to the principle of a socketless circuit. Structurally, the sleeve coupling is made taking into account the compensation of shifts from thermal expansion

If sewage is arranged from scratch, in this case it is worthwhile to carefully approach the installation procedure. Correct installation, work with shaped elements - these criteria also give a good effect of silence in the process of future operation of the system.

Option # 1: socketless connection

For example, it is recommended to connect tubeless pipes to each other as follows:

  1. The cut ends of the polypropylene pipes (cut angle 90º) should be leveled and deburred.
  2. Use sewer sleeve coupling as a shaped part.
  3. Remove the sealing collars from the inside of the sleeve coupling and put them on the pipe nozzles.
  4. Apply water-based lubricant over the sealing lips.
  5. Insert the nozzles (using some force) into the sleeve coupling until it stops.

By the same principle, a bell-shaped one is performed pipe connection, connection with tees and corner fittings. Moreover, in most cases of socket mounting, the creation of expansion joints is considered.

Option # 2: socket connection

Pipe and fitting joints, performed without the use of a sleeve coupling, arranged on a pipeline section up to 3 meters long (horizontal section), require compensation for thermal expansions.

That is, during installation, a 10 mm pipe recess is mandatory after it is inserted into the socket until it stops.The effect of thermal expansion is allowed not to be taken into account only in schemes of bell-shaped connections between fittings.

The scheme of inclusion of collars on the line with a bell
A fragment of the scheme of a sewer riser, on the line of which a bell connection is used. The standard arrangement of mounting clamps (rigid and floating fixation) is shown. With this arrangement of fasteners, optimum noise performance is achieved

Method for creating a bell-shaped joint:

  1. To clear a branch pipe, an internal part of a bell, an area of ​​a sealing ring of pollution.
  2. Make sure that the fit of the o-ring of the socket meets the installation requirements (no twisting, damage, dents).
  3. Apply water-based pipe nozzle.
  4. Insert the pipe all the way into the socket and then push it back 10 mm.
  5. Install a mounting clamp near the connection point.

Separately, it is worth considering the method of fastening silent sewer pipes (for example, the Skolan brand). Here pipeline laying requires performing in such a way as to exclude physical stress and the possibility of linear expansion.

You can fix the now popular polymer sewer pipes with standard clamps, but under the hoop of the clamp you should definitely use linings based on profile rubber.

Location of mounting clamps
Fragment of the scheme of the sewer riser, showing how the mounting clamps (sliding and fixed fixing) are located on the pipe section without fittings

Recommended mounting principles for clamps:

  1. On a horizontal line, the distance between the clamps is 10 pipe diameter sizes.
  2. On a vertical line, the distance between the clamps is no more than 2 meters.
  3. On risers, mandatory installation of a rigid and floating mount with clamps.
  4. Rigid mounts on socketless pipes are arranged above the fitting in the area of ​​the lower pipe.
  5. Floating clamp fastening is provided by incompletely tightening the tightening screws.
  6. The floating mount is arranged next to the hard mount on the side of the nozzle inserted into the socket.

Subject to the following principles when installation of sewer system, really get the acceptable noise characteristics of household sewage at the level of 12-20 dB.

Subtleties of installation, affecting the noise level

Under no circumstances should machine oils or similar lubricants be used as the lubricant for joint elements. All of them have a negative effect on the structure of rubber seals.

Rubber loses its technical properties; cracks and roughnesses appear on seals. Such a seal becomes not only a source of increased noise, but at any moment it threatens with a gust.

Grease for sewer connections
The connection of polypropylene pipes is preceded by lubrication of the areas directly involved in the contact. A specialized water-based gel (grease) is used as a lubricant.

It must be remembered that the “straight pipe - socket” joints are always mounted taking into account the installation of the edge of the socket against the flow of drains. Under such conditions, maximum smoothness of the inner surface of the sewage line is ensured, which in turn is accompanied by a low noise level of the stream.

The noise characteristics of the sewage system are also affected by the value pipe slope. It is not recommended to depart from the established standards and norms that determine the amount of slope depending on the diameter of the sewer sleeve.

For pipes with a diameter of up to 50 mm, a slope of not more than 35 mm, a diameter of 50 to 100 mm, a slope of not more than 20 mm is recommended. Pipelines with a diameter of 150 mm are mounted with a slope of not more than 8 mm.

Turns of piping lines, as well as branches, are made by installing oblique tees or half bends (angles 30-45º). The principle of building networks in this way helps to reduce sewer noise.

The effect of noise suppression during salvo discharges into the sewers is especially noticeable.In addition, smooth bends of turns create better conditions for the case of cleaning the system with a sewer cable.

Turns on sewer lines
The correct (incorrect) execution of turns in the domestic sewage system is one of those factors that affects the amplification (reduction) of noise. On installation, it is recommended to adhere to the methodology for creating smooth turns and bends

Plastic pipelines in straight horizontal sections should be fixed with clips, supporting clamps, suspensions every 7-9 meters. If you move away from these requirements, there is a risk after some time of operation to get sagging in such areas of the region.

Sagging pipelines - a change in the parameters of the movement of effluents and, as a result, an increase in noise. In places of bell-shaped joints, fasteners are carried out by default.

Signature Sewer Brand Products

There are brands that have proven excellent quality and are firmly entrenched in the domestic sewer product market.

Vavin Asto and ASTOLAN

In recent years, market offers have been surprisingly with a wide selection of branded silent sewer systems. From the available examples for installation, it is possible to note, for example, a product under the brand name "Vavin Asto".

The company manufactures and supplies for sale. polypropylene pipes and fittingsbased on ASTOLAN - a material modified by mineral additives.

Silent sewer Wavin Asto
The low-noise sewage system manufactured by Wavin Asto (a set of pipes and fittings) is a turnkey solution that takes into account all the nuances of sound insulation. It remains only to assemble the system in accordance with the instructions and enjoy the comfort

Thanks to the modification, the engineers managed to raise the density of the walls of the sewer pipes to a value of 1.9 g / cm3 and strengthen indicators such as viscosity and specific gravity. As a result, virtually silent Vavin Asto sewage systems appeared.

According to the assurances of company representatives, during the operation of the system there are no vibrational noises. Penetration of sewage sounds through airspace is also excluded.

German quality Ostendorf

Another example of a modern system without noise is a sewage system based on pipes and fittings of the Ostendorf brand. The base material is the same, mineral-modified polypropylene.

But the density indicators in this case are slightly inferior - 1.6 g / cm3. At the same time, the temperature parameters of the Ostendorf sewage system are higher - up to 100ºС, and the pH values ​​are in the range of 2-12.

Silent sewer Ostendorf
The German company Ostendorf offers to use engineering solutions that guarantee peace in the house. German manufacturing techniques for sewer pipes and fittings exclude the manifestation of technical noise above established standards

The branded product Ostendorf is characterized not only as low-noise. All elements of production are characterized by a high degree of corrosion resistance, durability, resistance to the influence of aggressive environments. An extensive range of fittings and pipes provides the creation of communications for various purposes.


Rehau systems also show a high percentage of popularity. In particular, the product REHAU RAUPIANO Plus is aggressively advertised. The technological approach, however, is not much different from the two previous firms.

The emphasis in the fight against noise “Rehau” is also placed on the production of multilayer plastic pipes, on strengthening the wall thickness of corner fittings, on the manufacture of so-called “noise-absorbing” clamps.

Silent Rechau Sewer
Parts for the installation of a household sewage system, manufactured under the Rehau brand, are made taking into account effective sound insulation. Rehau-based sewer installation promises a quiet life

The practice of operating such a sewer shows a noise reduction of about 25-30%.If desired, similar indicators can be achieved if you perform standard work on sound insulation of a domestic sewage system using available insulation materials.

With guidelines for choosing the best pipes for the device of the internal sewer system acquaints next articlecontaining a lot of useful information.

Conclusions and useful video on the topic

Some useful tips on how to reduce the noise level of a sewer system and make your life more comfortable.

A low-noise sewer system is possible, as evidenced by numerous proposals in the plumbing industry. Meanwhile, there were practically no problems with the noise parameters of the drains as long as the good old cast-iron pipes were used.

As soon as light and inexpensive polypropylene appeared in everyday life, so after it there were problems with silence in the house. There is something to think about for both plastic manufacturers and homeowners.

Please write comments in the block below. Tell us about how you built a silent sewer in your own house / apartment, or about technological nuances not mentioned in the article. Ask questions, share useful information, publish photos on the topic.

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Visitors Comments
  1. Vania

    Sewer communications sometimes make very unpleasant sounds, which is why they started using silent pipes. Some people make soundproofing conventional pipelines. But I believe that it is easier to immediately use silent pipes, as they perfectly damp out sounds. They are easy to install, and the service life of the engineering systems assembled from them is very long.

    • Expert
      Vasily Borutsky

      If it were easier to make a silent sewer, then they would do it, but now MUCH more popular is the sound insulation for conventional pipelines. Based on this, you can conclude. Yes, it’s enough to even look at the difference in price.

      In addition, the desired effect of noiselessness (in any case, those parameters that are specified by the manufacturer of these products) can be achieved only if you very strictly observe the installation technology in the entire building, and not just in your apartment.

  2. Alexei

    Here is the news! In fact, the market does not stand still, new technologies are constantly appearing, just keep up with them. I first learned that there is a silent sewer. Just a month ago, I completely changed the wiring in the bathroom. I would love to put such pipes if I knew about them. And then ordinary polypropylene noise is no less than cast-iron.

  3. Nikita

    Is it necessary to coordinate the project with the Housing Office or somewhere else? For an ordinary odnushka in Khrushchev, how much will such a pleasure cost?

    • Expert
      Vasily Borutsky

      The project of such a silent sewage system you need to coordinate with the Criminal Code of your home, otherwise, in case of a breakthrough or some kind of accident, they will not bear any responsibility if you made a replacement without approval. As for the cost, it is difficult to give an exact figure, since there is little data on the current wiring, the state of communications in your apartment, among neighbors, and so on.

      For example, Pipe d.100x250 mm. silent Ostendorf Skolan costs about 9-10 dollars, you can calculate the required amount yourself, plus adapters, sealants and other little things, as well as coordination of the project and the work of the master.I think that for a one-room apartment in Khrushchev, you can invest in the budget of 250-300 dollars. If you install it yourself, then you can really invest in $ 200.

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