Connecting metal-plastic pipes - we use various types of fittings. Connection of metal-plastic pipes, types of connectors, methods of their installation or your own master Metapol connection fittings

Metal-plastic pipes are good because they combine all the advantages of plastic and metal. Due to their multilayer nature, such pipes are quite durable. However, during the installation of a pipeline from them, the question often arises of how to connect them on your own, is it possible to do this at all?..
Of course, this can be done. Moreover, as will be shown below, even in several ways.

What to consider when connecting such pipes

Whatever connection method you prefer, a number of general rules will apply to them that will need to be taken into account:

A metal-plastic pipe is one-piece, butt-welded by laser or ultrasonically overlapped. aluminum pipe, protected inside and outside with polyethylene layers.

In no case should the slightest damage to the pipes be allowed, since cracks, cuts, and any other - even the most seemingly insignificant defects - lead to further leakage;
When unpacking the pipes, you also need to be as careful as possible. The same applies to the process of bending them;
Compound metal plastic pipes can be carried out by two types of devices - these are screw fittings for plumbing and sewer systems and crimp fittings;
If preference was given to compression fittings, they should not be allowed to be embedded in the wall. After all, only a welded, unbreakable pipeline can be walled up tightly.

In the future, we will talk about how you can connect metal-plastic pipes with each other using these two types of fittings.

Connecting metal-plastic pipes using crimp fittings

To begin with, it would not be superfluous to understand exactly what parts such a fitting consists of:

Press pliers for fittings are a device designed for installing a part onto a pipe. There are manual models and hydraulic.

Brass fitting;
A spacer ring designed to provide electrical insulation;
O-ring made of polypropylene rubber;
Crimp sleeve made of stainless steel;
Directly a metal-plastic pipe;
Crimp sleeve;
And the shank.

Pay attention! To successfully connect a metal-plastic pipe and a press fitting, you need to use a specialized press machine. It can be either mechanical or manual. Such tools are commercially available; using only them, you can successfully connect pipes. Mastering them at work will also not be difficult.

First, using specialized scissors, you need to cut the pipes to the required length;
Then the internal chamfer is removed; if the pipe has lost its shape, the situation can be corrected by using a special calibrator;
Then you need to remove the external chamfer using a chamfer remover;
The internal diameter of the pipe is also checked using a calibrator;
The sleeve is removed from the fitting and the integrity of its rings and gaskets is checked. If everything is in order, then the sleeve can be returned to its place;
The fitting shank is inserted into the pipe with a certain force;
Then the sleeve is inserted into the press fitting until it stops, and the handles are connected.

Press fitting - a type of one-piece, maintenance-free fittings for connection metal-plastic pipelines with increased requirements by mechanical compression using special press machines.

After all this work, you need to check the integrity and quality of the connection made. If everything is in order, then we can assume that the assembly was successful.

Features of connection using a compression fitting

The design of a compression fitting is somewhat different from that of a press fitting. So, a compression fitting consists of:

Brass fitting;
Insulating Teflon ring;
Nickel plated tightening nut;
Crimping ring with a special cut;
Rubber sealing ring;
Metal-plastic pipe;
And also from the shank.

The connection in this case occurs in the following steps:

Scissors for cutting metal-plastic are hand tool, which is recommended to work with if the diameter of the cut products does not exceed 40 mm.

First, cut the desired section of the pipe using special scissors;
Using a chamfer remover and calibrator, chamfers are removed from the inner and outer surfaces of the pipe;
A tightening nut is put on one end of the pipe, then a crimp ring is put on;
The end of the fitting is inserted into the pipe. The end of the fitting is also inserted into the pipe;
Then the ferrule ring must be moved towards the fitting, after which the tightening nut must be moved towards it so that it covers the ferrule ring;
To seal and seal the thread, you can use FUM tape or sealant paste;
Finally, using two wrenches, the tightening nut is tightened until it stops. In this case, two wrenches are needed so that you can hold the pipe stationary with one and tighten the nut with the other. In this case, excessive force should not be used, as there is a risk of damaging not only threaded connection, but also the pipe itself.

Compression fittings are perfect solution for metal-plastic pipes. Such fittings are made from brass, copper, steel or plastic. They allow you to quickly and without special equipment install pipe structures.

If, after a thorough inspection, no damage or leaks were detected, then we can assume that the connection process was successful.

How to connect metal-plastic pipes with pipes made of another material

Quite often during repair work there is a need to connect pipes made of metal-plastic with pipes made of other materials. At the same time, you can use the most different methods. The choice remains at the discretion of the consumer and based on what kind of material has to be dealt with in a particular case.
For example, to connect a metal-plastic pipe to a metal pipe, you need to use compression fittings. It is important to follow the sequence of actions and be extremely careful. To make a connection you need to do the following:

The connection of metal-plastic pipes with metal ones occurs using special devices - fittings. They have different configurations and provide fastening both in a linear plane and at an angle of 90 degrees.

First of all, prepare a metal pipe. The essence of the preparation is that the pipe is stripped down to bare metal. It is necessary to remove rust, paint and any other contaminants from it;
Now you need to screw the fitting onto the thread. In this case, it is better to first wrap tow on the thread to improve waterproofing;
A press washer with a nut is placed on the metal-plastic pipe, and calibration is performed, if necessary;
Next, you will need to put the end of the metal-plastic pipe on the fitting cone, which is screwed to the metal pipe;
The nut is screwed on using a special open-end wrench. The washer should ultimately compress the metal-plastic pipe as firmly as possible.

This type of connection is very strong, reliable and will not allow leaks. Here, however, the main thing is to choose the right diameter fitting.
If you need to connect a metal-plastic pipe with a polypropylene pipe, then you can use couplings that are designed for this purpose. At one end the coupling is soldered to a plastic pipe. At the other end of the coupling there is a special thread. A fitting with an external thread is soldered into a polypropylene pipe, into which you will need to screw a fitting for a metal-plastic pipe with an internal thread. They just need to be twisted together more tightly - and the connection can be considered perfect.
Fittings made in the form of corners, tees, etc. are available for free sale. They allow you to quickly and easily connect polypropylene pipes with metal-plastic ones. It is also recommended not to neglect FUM tape or ordinary tow to ensure maximum tightness of the joints.
If you have to deal with PVC pipes, then they are connected to metal-plastic in exactly the same way as in the case of polypropylene. Almost the same fittings are used for this. The set of tools required to make connections is also similar.

Fittings are used not only when laying water supply systems, but when repairing them. If a defect is found on any part of the water supply, it is simply removed by replacing it with new site, which is attached using the same fittings.

What do experts say about this?

Mikhail Semenovich Petrov, master plumber: In order to make sure that all work on connecting the pipes was done correctly, you can check the shape of the coupling. It should have the shape of regular, even rings. But repeated crimping is strictly forbidden. If you neglect this rule, you can get cracks in the pipe body and, accordingly, leaks.

Petr Panov, master plumber: When connecting pipes using press fittings, you can check the correct progress of the work by looking through a special inspection window in the fitting sleeve. The pipe should be visible there. Moreover, fill the entire viewing space.

Nikolay Ivanovich Lebedev, master plumber, 11 years of work experience: Unfortunately, from time to time you can come across fittings that come with defective O-rings. Therefore, you should not rely too much on the integrity of the manufacturer. It is impossible to predict in which particular set the defect will occur. It is better to personally unpack it and disassemble the device immediately after purchasing the fitting kit. If there is a suspicion of a defect, under no circumstances should you work with such a fitting. You can replace the entire set or just the ring.

Summing up

Metal-plastic pipes are extremely common today. But pipes made from other materials are no less common. Fortunately, there are ways to connect both metal-plastic directly with metal-plastic and with other materials.
As a rule, it is still impossible to avoid purchasing specialized equipment for this. So, if you plan to perform only a one-time job, then you will need to take into account the economic component: whether purchasing special tools or inviting a specialist will still be a more profitable solution.
In the first case, it will be possible to save on the services of a specialist, but only if truly large-scale work is planned. In the second, you can be sure of high level the quality of all work performed.

The design of a metal-plastic pipe consists of 5 layers: an inner and outer shell made of polyethylene (PEX or PE-RT), an intermediate layer of foil and two connecting adhesive layers. Due to the multilayer configuration, metal-plastic products outperform composite analogues in terms of strength, maximum pressure and operating temperature, which makes them optimal solution for use in heating systems.

This article discusses methods for connecting metal-plastic pipes. You will become familiar with their installation using compression and press fittings, and learn how to properly glue the polymer segments together with your own hands.

Contents of the article

Rules for installing metal-plastic products

Installation and connection of pipelines from any plastic products, including, must be performed in compliance with the following set of rules:

storage of metal-plastic coils is carried out indoors at room temperature; pipes are not allowed to be placed at a distance of less than 1 m from heating devices;
installation work is carried out at a temperature not lower than 10 0;
in case of transportation of products in conditions subzero temperatures, before connecting, the pipes must be kept in a heated building for 24 hours;
coils cannot be dropped from a height when unloading;
open laying of the pipeline is permissible if the pipes are not exposed to ultraviolet rays and mechanical damage, otherwise they must be placed inside insulating protective casings;
Before connecting the pipeline, everything must be completed welding work and repair processes associated with increased fire danger;
open laying of metal-plastic products is carried out after finishing work has been completed;
laying of the pipeline must be carried out in strict compliance with the permissible limits, which differ for manual and mechanical bending;
for running a pipeline through a wall or interfloor covering protective metal sleeves must be used.

When laying, it is necessary to take into account the high elasticity of metal-plastic products. It is important to prevent kinks and sagging, which, together with linear expansion, can cause deformation of the pipeline.

For fixing lines on walls sliding clips are used. When implementing horizontal wiring The spacing of the clamps is 50 cm, for vertical installation - 1 m. The use of clips with rigid fixation is prohibited.

Sequence of installation of water supply from metal-plastic pipes

Metal-plastic pipes in aggregate performance characteristics are the best material for the installation of hot and cold water supply systems. Installation of water supply communications is carried out according to the following algorithm:

A basic pipeline diagram is drawn, on the basis of which a installation drawing, where indicated. General rule For all plastic pipes (polyethylene, polypropylene) it is necessary to comply with the minimum number of connections.
Based on wiring diagram The required length of the lines and the number of fittings for connecting them are determined.
The diagram shows the places where the pipeline is fixed on the walls, and the number of fastening clips is counted.
Connectors - fittings - are selected. If you plan to do all the work yourself or you are unable to purchase press pliers, give preference to compression fittings; if you plan to lay the pipeline hidden (concreting into a wall), you need to use press fittings.
According to the design diagram, the pipeline is installed with your own hands - lines are laid out, connected using fittings and fixed to the walls.
Upon completion of the installation of the internal pipeline and its connection to external communications, identified leaks are eliminated by tightening the fittings.

Keep in mind that fittings are the weak point of any plastic pipeline, so save on connecting elements highly not recommended.

Selection of fittings for connecting metal-plastic pipes (video)

Technology for connecting metal-plastic segments

The connection of metal-plastic segments is carried out using two types of fittings:

compression;
press

High-temperature welding (soldering) and gluing are not performed; these methods are only applicable for composite products– polypropylene, polyethylene and PVC.

Choice specific type fittings depends on functional purpose pipeline. If you are installing a cold water supply system or a system with external placement, it makes sense to use compression fittings, since their installation does not require special tools - the fitting's crimp nut is tightened with ordinary open-end wrenches. A compression fitting provides a detachable connection that can be removed if necessary.

However, it is not recommended to use compression fittings when installing hot water supply and heating communications, since metal-plastic lines expand when heated, which can cause leaks at the fittings. Please note that compression connections cannot be used when laying the pipeline hidden (when installing the system behind decorative panels or when concreting it inside the walls), since they require periodic maintenance.

Press fittings are more reliable in this regard. They form a permanent connection that cannot be dismantled, but is resistant to leaks due to the linear expansion of pipes (water supply withstands pressure of 10 MPa). However, for the installation of press fittings it is necessary special tool– press pliers, which will cost you 1-3 thousand rubles. Press jaws are available in the assortment of all leading manufacturers selling polymer pipes– , Ekoplast.

To connect metal-plastic pipelines, the following tools are required:

(pipe cutter);
sweep or sandpaper and a file - for removing burrs;
calibrator - to eliminate the oval that appears after cutting;
adjustable or open-end wrenches (for compression) or press tongs (for press fittings).

Fittings of any type have an extremely wide variety of shapes. The assortment includes (in two segments) elbows, tees and crosses, with the use of which you can equip a pipeline of any configuration.

Let's consider connecting metal-polymer pipes using press fittings:

The pipe is straightened, measured and marked at the cut point.
The pipe is cut at a right angle using special scissors according to the installation mark.
Using a reamer or file, the cut is cleared of burrs.
The pipe is straightened by the calibrator and inserted into the fitting until it stops so that it is placed between the fitting.
The coupling is pressed using press pliers so that 2 uniform rings are formed on it. Please note that after displacing the pliers re-crimping cannot be performed.

Instructions for connecting pipes using compression fittings:

The cut is cut and cleared of burrs, and the end part of the pipe is straightened with a calibrator.
A crimp nut is placed on the segment, after which a split ring is installed at a distance of 10 mm from the cut.
The pipe is pushed all the way onto the fitting fitting and the crimp ring is first tightened by hand, and then pulled out using open-end wrenches - one key secures the fitting body, the second one rotates the nut.

The connection of metal-plastic pipes with metal ones is carried out using special press and compression fittings, which are equipped with a fitting with an internal thread for joining with a steel segment.

The installation instructions are as follows:

Using a grinder, the old metal pipe is cut at the site of the intended connection.
The pipe is cleaned of rust and coated with grease, after which a thread corresponding to the configuration of the fitting is formed on it using a thread cutter.
The thread is cleaned of dust and the fitting is screwed onto the steel pipe. The gap on the inside of the fitting is covered.
The metal-plastic pipe is connected using the technology discussed above.

You will need it with your own hands when creating plumbing and heating systems. engineering systems from this material.

Structurally, metal-plastic pipes are a combination of polymers and metal. This is a 5-layer product in which the outer and inner “shells” are made of cross-linked polyethylene, and between them there is a layer of aluminum. Adhesive layers are also provided at the points of contact between the layers.

The main advantages of this design include:

high corrosion resistance;
immunity to moisture and aggressive environments;
simple and quick installation;
the aluminum layer allows the pipe to take any shape;
it is possible to use wide pipes size range— from 16 to 32 mm;
versatility, the ability to create a system with any fittings.

Connection diagrams

The question of how to connect metal-plastic pipes can be solved using one of two connection schemes:

Sequential, when the entire system is connected in series, from one point of consumption to another.
, when each of the consumers provided in the network has its own supply. It is believed that this type of wiring is more convenient and economical.

Important: Whatever system you choose, for each device that consumes water, you must install its own ball valve. This will allow you to shut off the water supply at a point in the event of a breakdown.

The general connection diagram always starts with taps - high-quality ones, capable of operating with operating pressure up to 60 atm and heating up to +150°C. After them, a water metering device, a fine purification device, a pressure reducer, a manifold are provided, and water supply pipes are already routed from it to each of the installed devices. Filters are necessary to capture contaminants - sand, scale, and so on. As for the collectors, they ensure a uniform supply of water to each of the consuming devices.

What tool will you need?

Various methods of connecting metal-plastic pipes with your own hands will require several devices:

Scissors for cutting pipes must be of high quality so that the pipe does not deteriorate during cutting, so that burrs do not occur and the upper protective polymer layer is not damaged.
Calibrator - straightens the “consequences” of the cut when the wall is slightly concave inward, allowing the pipes to be flared.
Adjustable wrench and open-end wrenches.
Pliers and drill, tape measure.
, if they will be used for assembly. They come with a mechanical or hydraulic drive (household and professional, respectively).
Expander, in case of using sliding fittings.

Tool for installing metal-plastic pipes: 1 - scissors, 2 - press pliers, 3 - calibrator

How metal-plastic pipelines are connected

For water supply, metal-plastic pipes can be installed with your own hands compression or press fittings.

When compression fittings are installed, a nut is screwed onto the open ferrule ring. This creates pressure (using two wrenches), which creates a strong compression joint. In this case metal-plastic water supply It is worth installing in a single piece so that there are no “extra” connections. After all compression fittings will need to be tightened regularly to maintain the tightness of the connection.

Features of installation with press fittings

Connecting metal-plastic pipes with press fittings allows you to get permanent connections— they do not need to be regularly tightened, they will serve for about 50 years. In addition, at the joints a working pressure of up to 10 atm is allowed.

Important: Pipes installed using press fittings can even be filled with concrete.

The connection technology does not involve welding or soldering:

First, you should cut the pipe, strictly maintaining an angle of 90 degrees.
The edge of the pipe needs to be processed (chamfered). This ensures that the pipe is adjusted to the required diameter.
A stainless steel sleeve should be placed on the edge of the pipe, and the shaped part of the fitting should be installed into the pipe until it stops.
You need to apply a press clamp to the sleeve and connect the handles until they stop.

If during the installation process it becomes necessary to bend the pipe, then the use of corner fittings is not necessary. The material itself is very elastic, but it costs apply springs, preventing pipe pinching.

Do-it-yourself installation of metal-plastic pipes for water supply can be carried out using sliding fittings. To do this, the pipe is prepared for connection in the standard way, after which the coupling is put on. The pre-cleaned edge should be treated with an expander and flared. Then the pipe is put on the fitting, the sleeve is clamped in the press and moved. A push-on fitting works like this: when the coupling is pushed onto the fitting, the pipe is pressed and securely fixed. This type The connection is also permanent.

We attach the clips to the wall with screws. To ensure that the markings are done evenly, we first mark the places for the clips. The pipes are inserted into the bottom very easily. One click and everything is in place.

How to connect metal-plastic pipes with other materials

The connection of metal-plastic pipes with metal components is carried out in the case when a partial replacement of the water supply is carried out or a metal-plastic pipe is connected to an old metal riser. To carry out the connection work, a compression fitting and a calibrator are required.

Before connecting metal-plastic pipes with metal, you need to know that if products of different dimensions are joined, then the thread is selected in accordance with the size of the cast iron (steel) pipe, and the rest (cuff and washer) - according to the dimensions of the metal-plastic pipeline.

Tow is wound onto a metal pipe, after which the fitting is screwed on. The edge of the calibrated pipe is pushed onto the cone, which is already screwed to the metal. Then the nut is tightened with an open-end wrench, very carefully. The washer ensures reliable crimping of the metal-plastic pipe.

Considering the question of how to connect metal-plastic pipes with polypropylene, note that the connection with polypropylene is made by using special threaded fittings. Such a joint is sometimes needed at fastening points near geysers, washing machines.

General rules for laying a metal-plastic pipeline

Things to consider:

sensitivity of the material to thermal, mechanical loads, as well as ultraviolet radiation - in practice, this means that open wiring from such pipes can only be done in places where factors of such influence are excluded;
if the wiring is hidden, then there must be hatches and removable panels for easy access to the connecting fittings (if the fittings are screw type);
if metal-plastic pipes are being laid through building structures, then they are also provided with sleeves so that their internal diameter is larger size metal-plastic pipes by 5-10 mm - then a gap is formed that needs to be filled with soft material;
When laying, no cracks or scratches should appear on the surface of the pipes - this means that markings should only be done with a soft pencil or marker.

How to repair

Before you begin repairing a metal-plastic pipe, you need to determine the location of the leak, turn off the water supply and dry the pipe, as well as clean it of grease, dust and other contaminants.

Repairs can be performed using one of the following technologies:

Bandage as a temporary repair method. You need to take a rubber pad, apply it to the leak area and secure it.
Temporary methods also include flange, into which the rubber gasket is installed.
Using sealant You can reliably cover up cracks and leaks, but this composition will also deteriorate over time.
Epoxy glue- the leak area is coated with it, then a layer of bandage or cotton fabric is applied, after which another layer of glue is applied. The entire area must dry for 11 hours, and then the water supply can be restored.

Most often, repairs are made at the joints, that is, at the fittings. You can simply tighten the junction of the elements, but if the leak does not stop, then the joint will have to be dismantled. Here possible reasons the malfunctions are:

damage to the rubber sealing rings - such elements are not repaired, but replaced;
if the pipe has an uneven cut, then it needs to be leveled and recalibrated;
If the brass body of the fitting bursts, the fitting is completely replaced.

When installing new fittings, you can lubricate the joints with silicone - this provides additional waterproofing.

Metal-plastic pipes - DIY installation video

The video provides instructions for self-installation metal-plastic pipes.

The pipe is installed (Fig. 10) using special compression-type brass fittings. These fittings consist of a fitting, a split ring and a union nut and provide reliable connection pipes and fittings using conventional wrench. When the union nut is tightened, the press sleeve (O-shaped cut ring) is compressed on the pipe and a tightness is ensured between the fitting and the inner wall of the pipe.

Rice. 10. Connection of a metal-plastic pipe with a compression fitting

The main advantage of this connection is that no special equipment is required during installation, and if necessary, it is possible to dismantle any connection. Once assembled, the assembly can theoretically be disassembled and reassembled, but, as practice shows, it is better not to touch the connection. Therefore, in case of pipeline repair, you need to cut out the damaged part and insert a new one, connecting it with fittings. When connecting a pipe to a used fitting, the sealing gaskets on it must be replaced with new ones (Fig. 11).

Rice. 11. Gaskets on the fitting fitting

The pipe is cut perpendicular to the axis with a special pipe cutter for composite pipes, or, in extreme cases, a hacksaw with a fine tooth. Bend the pipe by hand or using a special spring - a pipe bender. Two types of springs are used: some are inserted inside the pipe (practically not used), others are put on top of the pipe. The minimum bending radius of a pipe without a spring is 5 outer diameters of the pipe being bent, with a spring - 3.5 diameters.

In Russian construction market There are almost all types of compression fittings produced in the world. Fundamentally, their designs are not much different from each other, but there is still a difference: manufacturers produce detachable and one-piece fittings (Fig. 12), but this is not the main thing. When purchasing pipes and fittings for them, manufactured in different places, you should ensure their compatibility, since the outer diameters and wall thickness of pipes from different manufacturers, even for the same nominal pressure, may not match. In other words, it is better to buy fittings and pipes, if possible, from the same manufacturer.

Rice. 12. Diagrams of compression fitting connections from various manufacturers

When fastening metal-plastic pipes, a minimum of clamps and clamps are required, since the pipes retain their shape well. The pipeline is installed using both a manifold and a tee installation scheme. When installing tee circuits (in the language of plumbers, this circuit is called a “comb”), the fittings can be connected sequentially to the pipe or you can first mount the pipeline and then cut the fittings into it (Fig. 13).

Mark the installation location of the fitting

Place an insulating corrugation on the pipe (optional)

Rice. 13. Example of connecting a compression fitting

The sequence of connecting metal-plastic pipes with compression fittings:

1. Align the pipe, ensuring a straight section of at least 10 cm before and after the cut.
2. Cut the pipe at a right angle according to the markings.
3. Process the end of the pipe with a reamer, first with the calibration side, removing the lead-in chamfer of no more than 1 mm, then with the other side, no less than up to the mark, ensuring the correct rounded shape of the pipe.
4. Place the union nut and split ring onto the pipe.
5. Moisten the fitting.
6. Place the pipe on the fitting so that the end of the pipe rests with its entire plane against the edge of the fitting. Screw the union nut by hand until it stops on the fitting. The nut should tighten easily; if this does not happen, it means you are not turning it according to the thread. Further forceful tightening of the nut will lead to damage to the thread and, as a result, to leakage of the connection and subsequent replacement of the fitting.
7. Holding the fitting body with one wrench, use another wrench to tighten the union nut 1–2.5 turns so that 1–2 threads remain visible. The use of wrenches with additional levers is unacceptable - do not apply excessive force or overtighten the nut.

To avoid fogging of pipes or to insulate them, special corrugated hoses, most often made of foamed polyethylene, are put on the pipes. If for some reason the corrugation was not installed, but the need for it arose, then it can be installed later. For this corrugated pipe cut lengthwise and put on the pipe, after which it is secured with tape.

Figure 13 shows the installation of a tee fitting; in fact, the range of compression fittings is quite rich, it allows you to assemble a pipeline of almost any complexity.

Nipple with internal thread (transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 26×1; 32×1

nipple with external thread(transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 26×1; 32×1

Coupling (connection of two metal-plastic pipes) 16; 20; 26; 32

Elbow with internal thread (transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 26×1; 32×1

Elbow with external thread (transition to pipe fittings) 16×1/2; 20×1/2; 20×(3/4; 26×1; 32×1

Elbow (connection of two metal-plastic pipes) 16; 20; 26; 32

Tee with internal thread (transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 26×1; 32×1

Tee with external thread (transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 26×1; 32×1

To save money when installing pipelines, the connection of metal-plastic pipes must be made in accordance with mandatory rules. Despite the fact that the price of components for this type of pipe is significantly higher than for polypropylene analogues, metal and plastic pipes today continue to be widely used in the construction of water pipelines and.

Metal-plastic pipes combine the advantages of two materials:

the metal in the composition of such a product provides it with strength;
plastic provides flexibility to the product.

Since you can connect metal-plastic pipes in various ways, then you need to understand the features of each, and our article will help with this.

Connecting metal-plastic pipes to each other

Connection using compression parts

Basic rules (the work is not difficult, so you can do it yourself):

With this connection method, it is assumed to use special crimp fittings (connectors for metal-plastic pipes) made of brass. The part, which in this case is used to connect pipes, is a prefabricated structure - a union nut, a fitting and a split ring.
A wrench is required to get the job done.
The compression fitting can be disassembled if necessary and then reused.

Operating procedure:

prepare a pipe of the required length;
align the workpiece section at a distance of 10 cm before and after the cut line,
cut the pipe according to the markings using precision scissors, which are positioned at right angles to the axis of the pipe;
check the integrity of parts and gaskets;
put on the nut and then the fitting ring;
process the end of the pipe with a reamer - the internal chamfer is removed with the calibration side, and the external chamfer - with the other side;
use fittings for connection (the pipe must be pushed onto the fitting until it stops);
screw the union nut onto the fitting by hand and then with a wrench so that 1-1.5 turns of thread remain free.

When tightening the nut, you must be very careful so that the ring does not burst.

Connection using special press fittings

There are ways to connect metal-plastic pipes that allow for high-quality installation of a heated floor system, as well as hidden communications. One of them is to ensure the connection of metal-plastic pipes using press fittings. This connection is more reliable compared to the option when compression parts are used. To perform the work you will need a special tool -.

To know how to correctly connect metal-plastic pipes, you need to clearly understand the entire process of making the connection:

it is necessary to calibrate the cut edge of the pipe - remove the outer and inner chamfers;
check the pipe diameter with a calibrator;

check the presence of O-rings in the fitting, as well as the presence of a dielectric gasket;
place a crimp coupling on the edge of the pipe;
put o-rings on the fitting and insert it into the pipe;

crimp the steel coupling using press pliers (this tool should include liners for pipes of different diameters). When crimping a steel coupling, you must ensure that the side of the sleeve is in the recess of the press nozzle.

When making a press connection of metal-plastic pipes, it is not advisable to press the steel coupling twice.

If the press fitting has a coupling attached to it, then it is immediately placed on the pipe, and through the hole in the coupling, control the depth of its seating.

Connection using push-on fittings

With this method of connecting pipes, you will need, in addition to press pliers, an expander that allows you to expand the diameter of the pipe. The result is a permanent connection. It can be used when hidden installation pipelines, including when pouring concrete.

When carrying out work it is necessary:

cut the pipe;
place a coupling on the edge of the pipe;
expand the edge of the pipe using an expander;
place the fitting on the edge of the pipe;
press the coupling;
the fitting is tightened onto the fitting, ensuring a reliable tight connection.

Application of a hybrid connection of metal and metal-plastic pipes

How are metal-plastic pipes connected to a metal riser? In this case, a hybrid connection is used.

For this job you will need a gauge as well as a compression fitting. If the products have different diameter, you should select a thread that matches the diameter of the metal pipe, while the washer with nut, collar and cone must correspond to the metal-plastic pipe.

The work is carried out in this order:

on metal pipe you need to wind the tow;
screw the fitting onto it;
Place a washer and nut on the metal-plastic pipe;
calibrate the edge of the pipe, put it on a cone screwed to a metal pipe;
using open-end wrench, carefully tighten the nut (the washer tightly squeezes the metal-plastic pipe).

You can and should make high-quality connections of metal-plastic pipes yourself. However, all work should be carried out in such a way that the connection technology is carried out accurately. At the same time special attention will need to be given and .