Types of compression fittings for polyethylene pipes. Compression fittings for polyethylene pipes. A short list of compression fittings for connecting plastic pipes

They allow you to reliably and make connections without the use of special welding equipment for connection plastic pipes. The connection of plastic pipes in this case occurs by a crimping method.
The advantage of compression fittings is the simplicity and ease of installation. There is no need to pre-prepare the connected pipes for installation. No special skills are needed to assemble compression connections, compression fittings are supplied ready for installation, assembled and complete.
Compression fittings have another important advantage - such connections are collapsible, and this allows, if necessary, to quickly dismantle or alter the pipeline system. Mounting polyethylene fittings can occur in almost any weather conditions, including at low temperatures.

Description and technical characteristics of compression fittings

Compression fittings are designed to connect pipes in drinking pressure and technical cold water supply systems, as well as in pipeline systems with a working medium, in relation to which the chemical resistance of products is ensured. Compression connections have different operating pressure in accordance with the label.

Compression fittings are made of durable polyethylene and polypropylene. Polyethylene fittings with threaded transitions are joined with metal products and products from other materials having the appropriate inch thread.
Polyethylene compression fittings reliably connect pipes made of the following materials:
- HDPE (PE80, PE63, PE100, etc.)
- PPRC (polypropylene type 3 - cold pipelines)
- PEX (cross-linked polyethylene - cold pipelines)

A short list of compression fittings for connecting plastic pipes

Fitting name	Picture	Existing sizes(diameter, mm)
Coupling for pipes of the same diameter		20,25,32,40,50,63,90,110
Reducer for pipes different diameter		20-63
Coupling with external thread for changing from plastic to metal pipe		20 x 1/2" ... 63 x 2"
Coupling with internal thread for changing from plastic to metal pipe		20 x 1/2" ... 63 x 2"
Branch (elbow) for changing the direction of the pipeline		20,25,32,40,50,63,90,110
Branch (elbow) with internal thread for changing the direction of the pipeline with a simultaneous transition to a metal pipe		20 x 1/2" ... 63 x 2"
Branch (elbow) with external thread for changing the direction of the pipeline with a simultaneous transition to a metal pipe		20 x 1/2" ... 63 x 2"
Tee for the production of a branch of a plastic pipe		20,25,32,40,50,63,90,110
Tee with external thread for the production of a branch with a simultaneous transition to a metal pipe		20 x 1/2" ... 63 x 2"
Saddle for connecting a branch plastic pipe to an existing pipeline		63 x 25, 110 x 32, 110 x 40
Saddle with female thread for connecting a branch metal pipe to an existing pipeline		25 x 1/2" ... 315 x 4"
Connection with built-in ball valve		20 x 20, 25 x 25, 32 x 32, 40 x 40
Connection with female thread with integrated ball valve, with simultaneous transition to a metal pipe		20 x 1/2", 25 x 3/4", 32 x 1", 40 x 1 1/4", 50 x 1 1/2", 63 x 2"
Flange connection for transition from a plastic pipe to pipeline fittings of flange connection		50 x 50, 63 x 50, 110 x 100
End cap for permanent or temporary sealing of the pipe end		20,25,32,40,50,63,90,110

Complete set of compression fittings

Compression fittings are complete products. This means that all elements of products are interchangeable only within the same type of product group.
It must be borne in mind that the split ring, designed for axial fixation, is made of strong but brittle polyamide. If it fails, the compression fitting must be disposed of.
Sealing collar Made of EPDM (rubber-like plasticized polyethylene) material. Frame compression fittings made of polypropylene. To give additional strength to products with internal threads, certain types of couplings and saddles may have an external reinforcing steel cage.

Storage of polyethylene compression fittings

Compression fittings must be stored indoors, protected from direct sunlight. Storage at negative temperatures is possible without restrictions. When storing compression fittings in heated rooms, it is not recommended to place them at a distance of less than 1 meter from heating devices.

Installation and use of compression fittings

Compression fittings are mounted without the use of special tools(small diameters) or with special wrenches included in the product range. Installation instructions for compression fittings are given below.
The threads of transitional compression fittings must be sealed with FUM tape, the tightening torque of the threaded connections must be controlled so as not to subject the connections to additional mechanical loads.

Installation instructions for compression fittings

The method of connecting HDPE pipes with diameters from 20 to 50 mm.

Pipe preparation.

Mounting.
The pipe is inserted into the compression fitting up to the mark. ATTENTION! The pushing force of the pipe must be significant, otherwise it means that the pipe has not entered into rubber seal. The union nut of the compression fitting is tightened to the end of the thread.

The method of connecting HDPE pipes with diameters from 63 to 110 mm.

Pipe preparation.
The pipe is cleaned of dirt. The pipe is cut with a straight cut, perpendicular to the axis of rotation.

Compression fitting preparation.
The compression fitting is disassembled, while removing: rubber sealing ring; resistant cup; split fixing ring.

Assembly.
Stage 1 - pre-assembly.
Assembly takes place without a split ring. A rubber ring and a thrust cup are mounted on the pipe. The pipe is inserted into the body of the compression fitting and a rubber sealing ring is filled into the gap. The ring is recessed as much as possible into the body and the thrust cup is pushed forward. The coupling is additionally pushed onto the pipe until it stops. The union nut is screwed on and screwed with a special key until it stops. In this case, the thrust cup settles into the housing.
Stage 2 - final assembly.
The cap nut is removed. The split ring is put on the side of the pipe and shifted to the coupling. The union nut is screwed in with a wrench until it stops.

Installation of compression polyethylene fittings with an existing transition to a metal pipe.

Compression fitting preparation.
The compression fitting is partially disassembled. The union nut is unscrewed by 3-4 turns.

Preparation of plastic pipe.
The pipe is cleaned of dirt. With a beveler or sharp knife cut the outer chamfer on the pipe. On the initial stage work, you need to mark the pipe: note the depth of the pipe entering the body of the compression fitting. Before installation, it is advisable to moisten the pipe with water or liquid soap. AT individual cases grease is applied to the rubber ring of the clutch.

Preparation of a metal pipe.
The pipe is cleaned of dirt. A thread is cut into the pipe and sealing material is wound (FUM tape, linen, etc.).

Mounting.
The plastic pipe is inserted into the compression fitting up to the mark. ATTENTION! The pushing force of the pipe must be significant, otherwise it means that the pipe has not entered the rubber seal. The union nut of the compression fitting is tightened to the end of the thread.
Metal pipe screwed into the threads of the compression fitting.

Operating conditions and safety measures

A pipeline with connections using compression fittings is used at ambient temperatures not exceeding + 40 degrees Celsius. It is possible to operate the pipeline underground and in the aquatic environment. Compression fittings are collapsible. It is recommended to install pipelines with compression fittings in such a way that they can be accessed during operation.
The connection of plastic pipes with compression fittings is durable (the service life is comparable to the service life of plastic pipes) if the connection is constantly in a humid environment and is not exposed to unacceptable chemicals and high temperatures.

Our Firm offers various types plastic pipes for sewerage, plumbing, heating, as well as connecting fittings to them. with an assortment and technical specifications You can find it on the website page.

The modern plumbing market provides many pipes from various materials, which are used for laying sewers, water pipes and other similar systems. Pipes made of different materials differ not only in their characteristics, but also in the way they are connected to each other.

Plastic pipes have several similar connection methods, but they all differ in their strength and ease of execution. In this article, we will analyze in detail all types of connections. polyethylene pipes as well as their advantages and disadvantages.

Getting to know the material

To begin with, it is worth disassembling the two main properties of polyethylene, from which pipes are made. Its first property is plasticity. Turning to GOST, you will see that the elongation coefficient of the material at break is 250%, but in reality this figure can reach 500-600%.

Such high rate plasticity is not always a plus. Thin polyethylene pipes will not withstand high pressure, and the threads cut on them for connection will completely make them inoperable, so it will not work to connect them with a thread.

The second property of polyethylene is fusibility. It allows you to weld pipes, because they begin to melt at a temperature of only 105-110 ° C. Here you can also find a significant drawback of these pipes - a low limit operating temperature, because the pipes soften at a temperature of 80 ° C, so it is impossible to use them for transporting hot liquids.

Having learned these properties, we can conclude that compression fittings for polyethylene pipes, as well as welding with a soldering iron - the best solution during assembly sewer systems. Next, we suggest that you familiarize yourself with all the connection methods in detail.

Butt welding

Despite the fact that fittings for PE pipes make it possible to achieve a reliable connection, it is not always advisable to use them. So, for example, pipes of wide diameter are connected strictly by butt welding, because large fittings cannot be quickly attached to the pipe after desoldering.

When assembling lines from pipes of large diameter, specialists use heating devices that melt the ends of two pipes, after which they allow them to cool, turning them into a single whole. The result is reliable connection, the strength of which is equal to 90% of the strength of the pipe itself, which is quite enough for highways with walls several centimeters thick.

Connection with welded fittings

AT this case fittings are used for welding polyethylene pipes, which differ from similar products for polypropylene pipes only with your material.

The connection is made according to the following instructions:

1. Cut the pipe so that the resulting end is perpendicular to the axis;
2. Chamfer the outside of the pipe and inside the fitting so that the connection is made without various irregularities;
3. Choose a soldering iron nozzle that is suitable for the diameter;
4. Select correct temperature heating the nozzle, bearing in mind that the melting point of polyethylene is lower than that of polypropylene by approximately 50°C;
5. Next, put polyethylene pipes and fittings for water supply on the soldering iron;
6. Now you can insert the pipe into the fitting, however, you must not turn the pipe, otherwise this will lead to the formation of peculiar waves, which will reduce the strength of the connection, as well as create a slight resistance to the flow of water.

Electrofusion connections

This method of connection is also based on the weld fittings described above, however, here you do not need a soldering iron. Such a connection of polyethylene pipes is made with fittings with a built-in metal spiral, which has a high resistance to electric current. Under tension, this spiral heats up strongly, melting the fitting.

Work should be carried out according to the following instructions:

1. Assemble all planned pipeline;
2. Connect step down transformer to electrical network or use a car battery;
3. Connect terminals to coupling(more details: "");
4. Wait for the time required for it to melt (may be indicated on the fitting or instructions for it), after which, do this work with all other electric couplings.

Compression fittings

Such fittings for polyethylene pipes completely solve the above problem. The compression fitting is a simple but standalone system, which consists of the following components:

• plastic case;
• Sealing rubber bands;
• Tightening nuts.

Assembling such a system is quite simple:

1. Insert the pipe into the fitting, after lubricating it with soapy water;
2. Tighten the tightening nut securely, which will press the sealing rubber.

There are many advantages to such a connection, but we will highlight two main ones. The first advantage is the ability to disassemble and reassemble the finished pipeline system. This possibility is especially relevant when using a boiler or a cleaning filter. The second plus of compression fittings is the ability to assemble the system without any auxiliary tools.

There are also some obvious downsides. For example, such connecting fittings for polyethylene pipes have a short service life, because the tightness of the connection depends entirely on the state of the sealing gum, which over time may lose its elasticity.

Conclusion

It is impossible to make a final choice between all the above methods of connecting polyethylene pipes, because each of them has important advantages, for example, welding is high reliability, and compression connections- this is ease of maintenance, so you have to make the final choice yourself.

Polyethylene compression fittings are compression fittings compression type for installation of polyethylene pipes of grade PE 80 and PE 100. Compression fittings for are produced by casting from polypropylene copolymer. Polyethylene compression fittings are available with internal and external threads. various forms: compression couplings, compression tees, compression elbows and saddle compression elbows, compression plugs and flanged compression connections.

HDPE compression fittings are produced with a diameter of 16 mm to 110 mm and a working pressure of 10 to 16 atmospheres (Bar): for a diameter of 16 to 63 mm up to 16 Bar, for a diameter of 75 to 110 mm up to 12.5 Bar. PND compression fittings are connected to PE pipes using a fitting ferrule, which is pressed onto the pipe. A compression fitting for polyethylene pipes is a collapsible design, which consists of modular components.

Areas of use

PND compression fittings are designed for connection and installation of polyethylene pipes of grades PE80 and PE100 in places of direction change: turns and branching, in places of change in pipeline diameter, in places of connection with pipe fittings, as well as for the transition from polyethylene pipes to pipes made of other materials. Compression fittings are used for the installation and repair of pipes of grades PE80 and PE100, which are used in drinking and technical cold water supply systems (pipelines transporting drinking and food water, process water in irrigation systems, etc.), as hermetic cable channels. Also, these fittings can be used in any pipelines with a working medium, in relation to which the chemical resistance of the compression fittings themselves is ensured. Polyethylene compression fittings are widely used in automatic irrigation systems.

The use of polyethylene compression fittings low pressure ensures complete tightness between the mounted parts. Installation of HDPE compression fittings of small diameters is carried out manually without the use of special tools, large diameters using a special compression key. Compression fittings for PE polyethylene pipes can be used in all weather conditions and at low temperatures. It is necessary to store compression fittings indoors, protecting them from direct sunlight.

The device of compression fitting HDPE

Compression fitting for polyethylene pipes consists of five elements:

1 - Nut-cover is made of polypropylene copolymer, designed for fixing and crimping, has internal thread and external slots for easy screwing.

2 - Compression seam ring is made of polyoxymethylin, prevents movement and extrusion of the fixed pipe, as well as spontaneous unscrewing.

3 - A sleeve with a pressing function, made of polypropylene copolymer, fixes the gasket in the correct stable position and limits its ultimate compression and pipe deformation.

4 - The sealing ring-gasket is made of nitrile rubber, provides reliable tightness of the connection with the pipe, even when it is bent.

5 - Compression fitting body, made of polypropylene copolymer, has trapezoidal thread for the nut and pipe insertion limiter.

Main advantages

• Ease of installation: installation is quick and easy pre-training pipes, as fittings are supplied ready for installation and do not require special skills and additional equipment.
• Easy to Repair: Compression fittings do not require special skills, additional equipment or welding machine, you only need a plastic or metal compression key, and the repair itself occurs by replacing the internal components of the compression fitting.
• Multiple assembly and disassembly: HDPE compression fittings can be assembled and disassembled repeatedly up to 10 times.
• Corrosion resistance: there are no metal elements in HDPE compression fittings
• Hygiene: all parts of compression fittings are made from materials that are suitable for transport drinking water and food liquids
• Connection with elements from other materials: HDPE compression fittings have a standard internal and external thread, so you can mount prefabricated elements for connecting pipes and fittings from various materials.

Properties and characteristics

Compression fittings for PE pipes are highly resistant to temperature extremes and highly resistant to various chemicals. Compression fittings for HDPE pipes are highly wear-resistant when transporting various liquids and have a service life of more than 50 years.

Today, plastic pipes are gaining popularity with confidence, and for them quality installation not to do without special connecting devices. With the help of compression fittings, installation of systems from HDPE, PE is carried out.

Compression fittings for polyethylene pipes guarantee complete tightness at the junction of the connected sections of the PE system without the use of a welding machine.

This part is able to connect the elements of the pipeline, in which there are branches, turns, pipes of various section sizes. They also help to quickly dismantle a certain part of the structure when it fails or breaks.

These connecting elements are produced immediately ready for installation. No preparation is required other than chamfering.

general information

Compression fitting for installation of polyethylene and HDPE pipelines consists of:

• clamp cover;
• rubber sealing ring;
• crimp ring;
• bushings for pressing.

The crimp ring and the rubber seal inside it are the main connecting elements of the two pipes to each other. It is them simple design allows for quick installation.

BUT a large number of assembly and disassembly does not affect performance characteristics fitting.

Installation or repair work of the pipeline with the help of such connecting elements is so simple that there is no need to seek help from professionals.

It is possible to do all the work yourself. Any high-quality plastic compression fittings for connecting polyethylene, HDPE pipes must have conclusions about their hygienic safety, which guarantees the possibility of using them in water supply systems for transporting drinking water.

Features of the connecting element

Connecting elements for HDPE pipes and for the installation of polyethylene pipelines are products of high strength and the possibility of a long service life.

They have the most various sizes sections from 1.6 to 11 cm, which makes it possible to equally well combine the constituent elements of systems with different sections.

The polymer, thanks to which compression fittings are produced for connecting polyethylene, HDPE pipes, allows products to not react at all to any chemical environment upon contact.

They connect equally effectively and have no contraindications for contact with drinking water and other food liquids.

The data is used for low-rise buildings and with a wire. Fittings are used wherever their connection is required.

They are at temperature regime about +20 degrees, connecting HDPE pipes with a cross section of up to 63 mm, withstand internal pressure up to 16 bar.

When connecting large diameters, it is desirable that the pressure does not exceed 10 bar.

Storage and use

Video 1.

The storage of fittings does not require any specific conditions, the main thing is to protect them from UV rays, but if we talk about polypropylene products, which are used more and more often, then they Sun rays do no harm.

Negative temperatures will not affect the quality of products in any way, but when stored in a heated room, place plastic compression fittings no closer than a meter to any heating device.

And forms, threaded on the inside or outside details.

Each of these elements can be used both for the installation and repair of plumbing systems using durable polyethylene grades PE80 and PE100, which are used both for transporting drinking water and liquids for technical purposes.

Polyethylene components are often used when creating an automatic irrigation system on a plot or flower bed.

Installation instructions

Video 2.

Using, plastic fittings for PE pipes or polyethylene systems, it is worth following all the recommendations of the manufacturers regarding their installation and use, as well as following the instructions for use that were issued at the factory.

If the pipes comply with all standards, then their connection should not cause problematic consequences.

Fittings with a diameter of 16-50 mm are mounted without the use of any plumbing tool, while for connecting pipes large diameter use a chain wrench.

In order to connect correctly, it is recommended to follow the following instructions:

1. using any sawing tool, we cut the pipes at a right angle to the desired size;
2. joints should be cleaned of burrs and sawdust at the same time slightly rounding them. The joint must be completely clean and free from visible cracks or irregularities;
3. screw of blue color is removed from the fitting and put on the pipe, and the clamping ring white color set in such a way that its thick part looks in the direction of the tail of the pipe;
4. the pipe is inserted into the connecting structure until it stops, it is also done with the ring. Tighten the blue nut initially with bare hands and then tighten it harder using a special tool.

Benefits of using them

Plastic compression fittings guarantee a tight connection of pipelines made of PE, PP and HDPE components, thanks to a special sealing system.

They do not need constant checking and tightening, so they can be used during installation. underground water supply or what will later be walled up in concrete.

Plastic compression fittings polyethylene HDPE maintain working pressure in system to 16 atmospheres. They are easy to install, and the quality of the connection is not affected by any additional preparation.

Technological features make it possible for short time establish a connection and reduce installation costs. The connection does not give in to corrosion, is hygienic and durable, moreover, it perfectly connects plastic products of different diameters.

These connectors are complete. This suggests that any element of the product can be replaced using spare parts of the same product group.

It is worth considering that the ring intended for axial clamping is made of durable and at the same time fragile polyamide, and if it breaks, then the fitting can no longer be used and must be disposed of.

Video 3.

If we talk about the seal, it is made of rubber-like plasticized polyethylene. The main body of the fitting is polypropylene.

In order for the product, with a thread embedded in the inner diameter, to be as strong as possible, in some of their varieties an outer steel clip is added.

They are compatible with every PE pipe made from LDPE (40, 80, 100) and are manufactured to suit all regulatory requirements.

In practice, many professional workers engaged in installation and repair work in plumbing systems, made sure of the reliability of compression plastic connectors, which are integral parts in any plumbing construction polyethylene or HDPE pipelines.

In addition to the fact that compression fittings for polyethylene pipes do not react to sharp temperature fluctuations, to chemically active environments, they can work without interruption for half a century.

The pipeline made of polyethylene has increasingly become used in modern repair work. In new homes, as well as overhauls the old ones are almost impossible to find welded pipes of steel. Even when installing heating, they are increasingly resorting to the use metal-plastic structures. This pipeline is much cheaper to operate, more durable and is not affected by such a phenomenon as the settlement of the foundation, which is why in old buildings the pipeline is regularly depressurized to the places of its weak connection.

To install a new generation of pipeline structures, fittings for polyethylene pipes are used. With their help, you can mount any configuration of the pipe network, as well as provide the necessary branches and bends.

Fittings that connect pipes of the same width are called straight, and those products that are designed to connect communications of different diameters are called transitional.

The connection of pipes using fittings is distributed by wide assortment samples on the market.

Fittings can:

• Provide pipeline bends at various angles.
• Provide connectivity in multiple directions.
• Work to increase or decrease the width of the pipeline in the right places.

Only fittings for pipes made of polyethylene for welding differ from all other types of products in their functionality. This auxiliary part is installed on the pipe, and then the junction is heated with a special soldering iron. In terms of strength, this type of connection is not inferior to solid casting. The only disadvantage of this design is that once the system has been dismantled or reconfigured, they cannot be reused.

Compression fittings

This type of fitting for connecting polyethylene pipes is optimal because no special skills or tools are required for installation. To install them, only the muscular strength of the hands is required. Compression fittings are a plastic housing with rubber gaskets and two clamp nuts. Nuts are screwed onto the threaded ends of the pipes, and a well-tight rubber gasket prevents liquid from seeping through at the junction. The nut is usually covered with hooks on the outside so that it does not slip out even from wet hands when twisting.

The pipeline with compression fittings lends itself perfectly to dismantling, so it is very convenient to use, for example, on suburban area for surface water supply. For the winter, it can be easily disassembled and folded into a specially designated room.

In addition to compression fittings, other types are used to fasten pipes. Consider them and compare with the first option.

Electrofusion fittings

This type of pipe fastening can be called the most exotic. At the same time, it provides one of the most reliable and durable connections. Electrofusion fittings for polyethylene pipes are a plastic case, inside of which there are copper heat-energy carriers that have an outlet for a special electric heater. Electricity, supplied to the outlet, provides a gradual heating of the fitting, due to which a continuous seam is obtained.

The electrowelded connection is very durable and has many undeniable advantages. For example, a pipeline connected using such fittings can be dismantled and reused. To do this, you need to re-heat the fasteners and disconnect the pipes. The connection is very reliable, it is not inferior in strength to a one-piece cast system. It is very easy and quick to install a pipeline using electrofusion fittings, so this option is perfect for systems with large quantity branches and bends. You can install this design where it is impossible to reach with a soldering iron or hands. Repair of the electric welding system is carried out quickly without making changes to the general scheme. The welding process can be carried out in automatic mode, and the fittings are recognized by the barcode indicated on the body.

Of course, this type of fitting is very convenient to use, but there is also dark side medals. The disadvantage of such systems is their cost. High price due to the use of expensive materials in the design of the fitting. On the other hand, fixing the pipeline is not something worth saving on, so the choice is yours.

Press fittings

Press fittings for polyethylene pipes are very convenient to use because they require a minimum amount of equipment to install. Such a fitting is a body with several gaskets, as well as two sleeves, which are pressed onto the ends of the connected parts of the pipeline.

Most often, only straight options are used as press fittings.

Pressing is carried out using special press tongs that fit the sleeves with great effort without the possibility of leakage. These fittings have an antistatic ring, which does not allow the charge to accumulate due to the potential difference between the two types of material.

Press fittings have many distinctive qualities. For example, their installation does not require electricity and great physical effort, since the fasteners are installed using the press tongs lever. In addition, press fittings provide high reliability of the connection, since the joints are made of metal. It is also possible to dismantle the pipeline using press tongs, but to re-install the system, each fitting must be numbered so that it is re-installed in its original place.

Brass fittings

Brass is one of the softest copper alloys and has a number of advantages over steel. Typically, brass fittings for polyethylene pipes are installed on threaded connections. Brass can also be used in the production of press fittings. Copper alloy fittings have a large margin of safety, exceeding that of plastic products. Brass fittings are usually produced in various options, which allows them to be used for the installation of non-traditional systems.

Brass fittings have their advantages. They can be used to extend pipes. If you use FUM tape, the connections are quite tight. Also, brass is a flexible and pliable material, which makes it possible to install polyethylene pipeline with tension. In some situations, this output is the only one. It should be noted that brass is absolutely harmless and does not burn. When using it, it is instantly covered with a layer of patina, which is inert to both cold and cold. hot water. In addition, the brass pipeline can be cleaned with acid, this will not affect its properties in any way, unlike steel systems. When vibrations occur, brass joints are not destroyed due to the flexibility of the material.

Crimp fitting. What's this?

Compression fittings for pipes made of polyethylene work using the technology of tightening the ring of flexible material with a slot when tightening the compression nuts. Basically, compression fittings are made of brass or plastic. They do not require installation. professional equipment, during the installation process, you need to use the muscular strength of the hands and a pair of wrenches.

There is another type of compression fittings - collet designs. The crimping principle in this system is similar to that which holds the lead in collet pencils.

Fittings with a crimp system are distinguished by the fact that they allow you to hide the error in the diameter of the connected pipes, thereby eliminating the need to calibrate the structure. These fasteners are perfect for eliminating a pipeline breakthrough, regardless of what the pipes were made of. The main thing is that at least a small chamfer is removed from the surface.

Preparation and installation of fittings

Connection process polyethylene elements distinguished by its lightness and speed. In addition, such systems are durable, reliable and economical. This is what provoked a rapid growth in sales of products made from this material. For high-quality installation of the structure, you need to use the instructions drawn up by professionals. Installation work for connecting polyethylene fittings and pipes require special training:

1. The amount of material required must be calculated in advance; for this, the total length of the system, the number of angles and drops are measured.
2. Turn off the water supply before installing fittings and polyethylene fittings.
3. If the room is installed heating system, then start his work from the boiler.

Welding of polyethylene fittings with pipes occurs according to the following principle:

1. 1. After cutting the pipes required dimensions you need to remove the chamfer from the edges.
   2. Insert the PE fitting and the prepared edge into the nozzle at the same time.
   3. Heat the parts for a couple of seconds, then remove them from the nozzles and fasten.

For a long time, the only materials used in sewer systems were steel and cast iron. The advantages of these materials include a long service life and strength, and the disadvantages are a complex labor-intensive installation, high cost and deterioration in the quality of the transported substance.

In the past few years, there has been active work for the replacement of old materials of sewer systems. Manufacturers tried to find the material that would include all the advantages of cast iron and steel and exclude their disadvantages. Not so long ago, this substance was found, it is polyethylene, and now both pipes and fittings are made from it. Initially plastic products did not have such high level strength, they quickly collapsed and crumbled under the influence of water and sun, but now all these problems are in the past, and now polyethylene pipes, fittings and fittings are the most reliable and inexpensive components of the sewerage system, which are widely trusted by both construction professionals and and ordinary citizens.