We connect steel pipes without welding. Connection of metal-plastic pipes: basic methods Connection of metal pipes with compression fittings

The creation of any piping systems requires a solution to the issue of connection individual elements. Parts of the pipes are joined in cases where a turn in the flow is required, or for horizontal connection of individual sections. To make joints, a welding method or a connection using fittings is used.

Types of fittings

Fittings differ in connection type and flow direction:

• bends and corners - used to change the flow of a single pipe system;
• tees - use if necessary to multiply directions;
• crosses - creating two streams;
• couplings - horizontal connection of two identical pipes;
• adapters.

Installation in most cases is carried out by assembly. The ability to assemble and disassemble the structure allows you to use the elements several times.

HDPE fittings: scope

sectional design

One of the types of structures used for connection are compression HDPE fittings. They are parts for fastening pipelines made of low pressure polyethylene. Also, this type of connector is used for copper and brass pipes.

The design of compression fittings is a body with a ring for clamping, bushings for pressing in and cap nuts.

The ring secures and provides a hermetic connection of pipelines. This design allows you to quickly install without much effort.

Used to connect elements with a cross section of 16-110 mm and grades PE80 and PE100. Such a piping system is used for plumbing.

The use of compression fittings is carried out mainly for private houses, water supply to small settlements. Also, these pipelines are used in public utilities, some enterprises and farms.

Compression HDPE fittings are designed to work in conditions not exceeding a pressure of 16 bar. Permissible operating temperature of the medium + 100 C.

Installation of equipment

The creation of connections using fittings is carried out according to the instructions. Before installation, pay attention to the quality of the pipes. They must comply with accepted standards.

Read more: Fittings for RVD - all the nuances and features

The cross section of the elements should not exceed the allowable 1%, and the ovality should not exceed 2%. If there are some deviations, for safety, such pipes are installed in horizontal sections.

This is what the key looks like

Connecting products up to 50 mm in size are installed manually. For large elements, a special wrench is used for compression fittings.

Before installation, the necessary pipe sections are prepared. To do this, the required section of the pipeline is cut at an angle of 90 degrees.

The pipe is thoroughly cleaned, irregularities are eliminated, the edges are rounded. The part that comes into contact with the fitting must be smooth and clean, no defects are allowed.

The nut is put on one of the ends of the pipe, the clamp ring is installed. The pipe is inserted into the fitting, the ring is positioned until it stops. Then the nut is tightened manually and using a tool. In this way, HDPE pipes are installed with compression fittings. The procedure does not take a long time, it is performed without much effort.

Useful scheme for installation

The main advantages of using such equipment:

1. connection strength;
2. the piping system, fastened with compression fittings, can be laid in the ground or concrete;
3. the materials used are not prone to corrosion;
4. accessibility for connecting different materials;
5. high speed and ease of installation;
6. connection durability.

Compression fittings for polyethylene pipes have a wide range, it is possible to select any configuration. Using this type of connecting elements, you can create a piping system of any complexity, with different amount branches, bends, which will meet all sealing standards.

Compression fittings for polypropylene pipes are used from the same material as pipelines. The widespread use of this type of pipes led to the creation of reliable materials for fastening them.

The assembled system is flexible and durable. Tightness is ensured by reliable fastening.

Compression fittings for metal pipes

Compression fittings for steel pipes are a fairly new type of connection. It is not used as widely as other options.

The use of such fittings with metal pipes

The structure of products is similar to analogues for polyethylene pipes. The design contains a nut, ring, rubber gasket.

Read more: Pliers for crimping fittings - purpose, principle of operation

The connection of pipes guarantees reliability and tightness. There are models of compression fittings that can be used for any material: steel, galvanized pipes, polyethylene.

There are some features that should be considered when using compression fittings for steel pipes. The connection may be broken by mechanical action. The pipe can be pulled out of the fitting by applying force. Thus, the tightness will be broken. Steel pipes are used precisely in cases where it is necessary to create a solid pipeline system.

The design assumes the presence of a rubber gasket. When using this component, it is assumed that the temperature of the working environment is not higher than 95 C, that is, an indicator for plastic pipes.

In some cases, such a temperature-limited connection can create inconvenience.

The use of compression fittings for steel pipes is optimal in cases where fast installation is required, and threading is impossible or difficult.

Compression fittings for copper pipes are used when welding is not safe or otherwise unavailable.

The video below shows in detail all types of compression fittings, features and product design. The installation process of the connection is clearly shown.

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When replacing water pipes, metal is increasingly used plastic pipes, since it is an inexpensive and completely reliable way to construct a pipeline.

However, few people still know how, for example, to connect metal-plastic pipes with metal ones. It is about the methods of connecting pipes made of metal-plastic that will be discussed in this article.

Methods for fastening metal-plastic pipes and preparatory work

There are two ways to connect metal-plastic pipes:

• using compression fittings;
• using press fittings.

The second method, in turn, is also conditionally divided into two types of connections - by means of compression couplings and using sliding type press fittings.

Before connecting pipes made of metal-plastic, it is necessary to draw a diagram of the location of pipes, heating appliances and plumbing. After that, you will need to prepare the tool and pipes, carefully measuring their length and cutting them into suitable lengths.

The deformed edge of the pipe should be leveled with a calibrator, the end should be cleaned of burrs and roughness with a round file or a sharpened drill.

Consider the methods of connecting metal-plastic pipes and their features in more detail.

Connecting pipes with compression fittings

The design and principle of operation of compression fittings

Compression type brass fittings consist of components such as a nipple, a split ring and a union nut, while providing a reliable connection of the elements with an ordinary wrench.

By tightening the union nut of the fitting, we thereby compress the press sleeve (split O-ring) on ​​the pipe, due to which the required density is achieved between the inner wall of the metal-plastic pipe and the fitting fitting.

Benefits of a compression connection

The advantage of this is that the installation does not require the use of special tools and equipment, while it remains possible to dismantle the connection if necessary.

Theoretically, once assembled unit can be disassembled and reassembled, however, in practice, you can see that the first used fitting and connection as a whole is the most reliable.

When connecting pipes with a fitting that has been in use, the gaskets should be replaced.

Installation of the pipeline using compression fittings

When fixing pipes made of metal-plastic, a minimum number of clamps and clamps will be required, since pipes of this type perfectly retain their shape.

The device of the pipeline can be carried out both according to the collector and according to the tee scheme. When using a tee scheme, fittings can be connected to the pipe in series or cut in after the pipeline has been laid.

The technology for connecting metal-plastic pipes using compression fittings is as follows:

1. I align the pipe t, providing a straight even cut before and after the cut is not less than 10 cm.
2. Next, prepare the pipe, as described earlier. It is also required to provide a lead-in chamfer at the ends of the pipe no more than 1 mm.
3. Put a union nut on the pipe, and then a split ring.
4. Moisten the fitting.
5. The pipe is seated on the fitting in such a way that its end rests with the entire plane against the edge of the fitting.
6. Tighten the union nut onto the fitting by hand until it stops. The nut should go through the threads easily, but if this requires the application of force, then it does not go along the threads, and further tightening can lead to thread damage, which most likely will require replacement of the fitting.
7. Holding the fitting body with one wrench, tighten the union nut with another wrench by 1-2.5 turns so that 1 or 2 threads remain visible.
   The use of wrenches with an additional lever and the application of excessive force is not allowed.

For the purpose of insulation, as well as to avoid condensation on the pipes, corrugated hoses are put on them, usually made of foamed polyethylene. The hose is cut lengthwise with one cut, put on the pipeline and, if necessary, strengthened with adhesive tape.

Installing the corrugation, however, is not the first priority and can be done later.

You can watch a video lesson on the thermal protection of metal-plastic pipes by entering a corresponding request on the Internet.

Marking of compression fittings

Fittings are marked according to two indicators:

• external diameter of the connected pipes;
• type of thread on the fitting.

For example, a female nipple fitting with a 16x1/2 marking can be used as a connection for multilayer pipes, on one side of which 16 mm can be attached, on the other - pipe fittings with 1/2 inch threads .

Connecting pipes with sliding fittings

The connection of metal-plastic pipes using sliding fittings is performed as follows:

1. Prepare the pipe for connection and put a coupling on it.
2. The cleaned edge of the pipe is treated with an expander and expanded.
3. They put the pipe on the fitting fitting, clamp the sleeve in a manual or hydraulic press, press it onto the fitting, and the connection is ready.

The principle of operation of the sliding fitting is simple: when the coupling is pushed directly on the fitting, the pipe is pressed as tightly as possible, thereby ensuring a reliable connection.

The issue of connecting pipes without welding is always relevant, since welding machine not everyone has home master and not everyone knows how to use it. At the same time, no pipeline is eternal, so such a need may arise in a country house, in a private house or in an apartment at any time. Below I will share with you some of the secrets of specialists that allow you to make such connections without welding.

metal

First of all, it should be said that all existing pipes can be divided into two types:

• metal;
• plastic.

As a rule, the most problems arise with docking. metal pipes, therefore, we first consider the methods of their connection.

So, there are several options for hermetic docking:

Let's take a closer look at each of these options below.

With threaded socket

Most often, metal pipes without welding can be joined using a threaded connection. In this case, respectively, threading is required. It should be noted that this is not such a complicated procedure as it may seem to many at first glance.

To cut threads, you will need an electric thread cutter or cutting dies. manual execution this operation. Since the price of an electric tool is very high, below I will tell you how to do the job manually:

1. first of all, you need to clean the surface from the paint, which is to be threaded. If there are influxes of metal on it, for example, remaining after welding, they must be ground off;
2. then you need to remove the outer chamfer from the end with a file;
3. then, on the prepared end of the part, you need to put on a lerka (die) and make half a turn. In this case, it is necessary to ensure that the die is put on strictly perpendicular to the axis;
4. then you need to perform a quarter turn back;
5. according to this principle, the thread is cut to the required length. In the process of cutting, the cutters must be lubricated with a special liquid or any other lubricant;
6. then, according to the same scheme, threading is performed on another part of the pipeline to be connected.

For socket mounting on one pipe, the length of the thread must be several times longer than on the other, so that a socket with a nut can be screwed onto it.

After threading, you can make a coupling connection with your own hands, which is done as follows:

1. a nut is screwed onto a long thread and then a coupling;
2. a nut is screwed onto the second end of the part;
3. then the pipes are connected, and the coupling is rolled up with the length of the thread, as a result of which it begins to be wound onto the second part with a short thread. This procedure must be performed until the junction is approximately in the middle of the coupling;
4. then nuts are screwed on both sides. Before tightening them, a tow should be wound between the couplings and nuts to waterproof the connection.

This connection is reliable and durable. However, it is not always possible to cut threads. If, for example, the pipeline is located close to the wall, this operation is unlikely to succeed.

Connection with Gebo coupling

The Gebo coupling ("gebu" or "gebra") is a special compression fitting. With it, you can connect steel pipes without threading and welding very quickly, and this does not require any special tools.

The scheme of its use is extremely simple:

1. parts are put on the pipe in the following sequence:

• screw;
• clamping ring;
• clamping ring;
• sealing ring;
• clutch;

1. then you need to put on the coupling halfway and tighten the nut;
2. then the second part is connected to the fitting in the same sequence.

I must say that this fitting exists both in the form of a coupling and in the form of a tee. This allows you to use it in cases where you need to perform a tie-in, for example, into a riser for wiring.

As for reliability, it depends on the quality of the installation. If the work is done correctly, then this installation is reliable and durable.

It is also possible to connect pipes without welding and threading using a repair and assembly clip. This fitting is a coupling or tee, which consists of two parts. Both halves are pulled together with bolts.

It should be noted that repair and assembly clips are intended primarily for temporary repairs, for example, in the event of cracks. However, in emergency situations, they can also be used to join pipes, especially if the pipeline will not work under high pressure.

In this case, the installation instructions are as follows:

1. first of all, the sections of the pipeline parts on which the fitting will be put on must be cleaned of rust and all kinds of irregularities so that their outer surface is absolutely smooth;

1. then a rubber seal must be put on the pipe. The cut of the seal must be lubricated silicone sealant. It should be noted that the seal must completely cover the pipes so that there is no gap left.
2. further, both halves of the fitting are put on a rubber seal and tightened with bolts, as shown in the diagram.

This method, as we see, is also extremely simple. By the same principle, a clamp-coupling is connected. The only difference is that it is tightened on one side, not two.

I must say that if you use pipe clamps, the connection of pipes without welding is even more reliable than using a mounting and repair coupling.

If you need to connect profile pipes without welding to assemble any structure, you can also use special profile clamps.

Plastic

If you need to assemble a plastic pipeline, you can use compression fittings, which work on the same principle as the Gebo coupling. Most often, metal-plastic and PVC pipes are connected in this way.

Also, sometimes special glue is used for these purposes. The installation process in this case is extremely simple:

1. places are smeared with special glue;
2. then the parts are rotated half a turn;
3. in this position they should be held until the glue hardens.

I must say that such a connection turns out to be quite strong, since the glue dissolves adjacent surfaces, and, in fact, welds them.

Compression fittings are also used to assemble metal-plastic pipelines. However, this requires a special tool that allows you to compress them.

For temporary repairs, the clamps described above can also be used.

Here, perhaps, are all the most effective ways pipe connections without welding, which I wanted to acquaint you with.

Conclusion

As we found out, in addition to welding, there are a number of other ways in which you can repair or even install a pipeline. Moreover, some of them allow you to get no less reliable and durable connection. The only thing, in any case, the work must be done very carefully, in accordance with the above recommendations, so that the pipeline is sealed.

For more information, see the video in this article. If you have any difficulties in the process of connecting pipes, ask questions in the comments, and I will definitely try to help you.

If you want to express gratitude, add a clarification or objection, ask the author something - add a comment or say thanks!

The connection of metal pipes is one of the inevitable stages of construction, installation of water, gas and oil pipelines. Even the construction of a vine arch or gazebo is not complete without this operation. In our article, we will look at how to join elements of small, large, as well as different diameters without threading or even welding.

For a long time it was believed that welding can be used to obtain the most reliable monolithic connection. This is true, but this method has a number of disadvantages. Firstly, substances harmful to the body are released during the process. Secondly, uneven heating of the metal leads to the appearance of welding stresses, which adversely affect the quality of the weld. Thirdly, very often the deposited metal cracks.

Welding of metal pipes

In addition, this type of work is quite laborious and requires certain knowledge, skills and specialized equipment. Sometimes the connection of steel pipes is carried out by means of special additional elements threaded. At the same time, special requirements are imposed on the quality of the fitting, especially for threads. The presence of dirt and defects, such as burrs, flaws, will lead to leakage.

There is another way to connect pipes, also without welding. To do this, you will need special components - couplings. One of the advantages of using such parts can be called detachable connections. You can dismantle the pipeline at any time, without the need for a special tool. It should be noted that such a connection is relevant for both polymer and steel pipelines.

Couplings are divided into compression and electric. The former are able to create a connection without welding. They are also very often called crimp due to the installation features, since this fitting holds the pipes together due to mechanical clamps. By design features they are divided into equal passage, i.e. for linear connection of pipes of the same diameter.

If it is necessary to create a branch, special tees and crosses are used. But with the help of plugs, you can block the pipeline.

Tee and cross for pipe branch

Also, special bends are often used, with which it is easy to change the direction of the line. There are compression flange fittings with male and female threads. With their help, you can connect elements of different diameters and even made of various materials such as metal and plastic. They are also used to connect pipes with other fitting elements: all kinds of valves, faucets, etc.

Electrical products deserve special attention. Their main feature is the presence of a heating coil. Such a coupling is fixed at the ends of the pipes to be connected using a special stop. Then the heating element is turned on. It heats the ends of the pipes to the melting point, as a result, after cooling, both pipes and the coupling are a monolithic structure. This device can withstand a pressure of 10 bar for gas pipelines, and for water supply, the maximum pressure reaches 16 bar.

The advantages of connecting fittings include low cost and a very wide range of uses. At the same time, they are distinguished by reliability and durability. The resulting compound is not afraid of either mechanical stress or temperature jumps. It is worth noting the ease of use, and compression products are reusable, they can be dismantled and put back on more than 10 times.

Connecting pipe fittings

If any part of such a fitting is out of order, you can replace it yourself without any problems. The advantages include the corrosion resistance of the material of which the connecting elements are composed. Let's take a closer look at all the advantages and possible disadvantages of an electrofusion fitting. Despite more complex structure, the elements are very easy to use, and installation is fast enough. The resulting connection will be monolithic, reliable and durable. This type of fitting is versatile and easy to install even in hard-to-reach places.

But you need to dwell on the disadvantages of the design. Firstly, it cannot be used in high pressure pipelines. Secondly, the contact of such a compound with an acidic and alkaline environment should be excluded. Thirdly, it does not tolerate temperatures above 40 ° C, therefore, in a hot water supply or heating system, it will not work to use an electric coupling.

Flanged products consist of a branch pipe and a metal flange. Compression - from the body, clamping and sealing rings, as well as a press-fit sleeve and a cover-nut. The clamping ring protects the structure from sudden unscrewing, which can be provoked by shocks and water hammers. But sealing element provides tightness at the joints. It, in turn, is fixed by a sleeve. The cap-nut also plays an important role, because it is she who holds the entire mechanism.

Flange Couplings

Electrofusion couplings consist of a body, heating element and terminals. The spiral is made of a special material. It can be hidden or open. But the latter option is used very rarely, since such an arrangement is not safe. Basically, manufacturers prefer a semi-open spiral. Thus, it is possible to provide good level safety and uniform heating of the material.

How to use elements correctly?

In this paragraph, we will pay attention to the practical part, namely, we will consider the installation features of each type of coupling.

How to connect metal pipes - step by step diagram

Step 3: Mounting the compression elements

We unwind the fitting so that it freely wraps around the hollow element. Then we make a fitting and put marks on the pipe, then during installation we will know the correct location of the parts and, if necessary, correct it. To facilitate the docking process, it is necessary to apply lubricant to the surface of the pipe. If one is not available, it's okay, a simple soap will do just fine. Next, we dock and tighten the union nut. The last operation ensures a secure fixation of the fitting even without welding.

Step 4: Installing the Electrofusion Couplings

In this case, the stage of cleaning the pipe cannot be ignored; all contaminants and dust are removed from its surface. Then it is necessary to cut the ends of the elements, and only a special tool is used for this purpose, a simple hacksaw or a knife is not suitable. Joints are carefully cleaned. It is advisable to treat them with a scraper to remove a thin layer of material. And with the help of clamps, a decrease in the diameter of the element is ensured. Thus, it will freely enter the fitting.

After the coupling is installed, it is necessary to connect the device that supplies electricity for welding. It should be noted that large diameter pipes require additional heating of the joints. Moreover, in this case, the installation is carried out in stages. First, the fitting forms a connection with one pipe, and then with the second.

The voltage applied to the product heats the spiral, and it melts the plastic. At this time, the elements are not only influenced high temperatures also under pressure. As a result, the molten material of the coupling and pipes is mixed and forms a permanent connection. After the heating has stopped, you should wait about half an hour. This time is enough for the products to cool down. Finally, the line is checked for leaks.

Most specialists and professionals in the field of repair and construction work in recent times more and more often it is recommended to use metal-plastic pipes when repairing and replacing plumbing pipelines.

Such pipes are quite practical and have a minimum number of disadvantages. The price is quite affordable, they have a long service life (50 years) in operation, they are easy and unpretentious in transportation and installation.

And, nevertheless, you should know a few points on how to properly connect metal-plastic pipes in various variations.

The correct connection of metal-plastic pipes is not complete without the help of appropriate tools. And any competent repairman, plumbing specialist or ordinary owner of a house or apartment knows about this.

If you suddenly needed to independently install plastic pipes at home, connecting them different ways and elements, then you will need the following tools and equipment:

• ring wrenches (usually they are used in two);
• sliding key;
• pipe bender (as a rule, the simplest pipe bender is used);

pipe cutter

As cutting pipes into various segments, separating pipe pieces from a coil or other methods of cutting metal-plastic pipes, you can use a special tool - a pipe cutter, which is capable of mechanically cutting pipes with a maximum diameter of 42 mm.

It consists of handle holders, internal blades made of durable tool steel and a locking bracket, which is a lock of two handles in the closed non-working position.

In the absence of this tool, you can use a regular hacksaw or a strong, sharp knife as a pipe cutter.

Any tool capable of cutting metal-plastic will do, but only a pipe cutter can provide a clean and accurate perpendicular cut. After all, for a hermetic connection of pipes, an ideal perpendicular cut is required.

Ring and adjustable wrenches

These wrenches are necessary in order to dismantle and assemble a metal-plastic pipeline and secure them with nuts, fittings and other threaded connections.

wrench

It is used only when necessary, but most often when connecting metal-plastic pipes to metal pipes.

Caliber

With the help of this tool, the cutting planes are centered and the chamfer is removed from the inside of the pipe. It is thanks to the caliber that the complete tightness of the connection of the pipe sections and the ends of the fitting is ensured.

Press tongs

These tools are needed, for the most part, where couplings are used that need to be pressed with tongs.

pipe bender

In those places where smooth bends of metal-plastic pipes are required or it is not possible to cut them off, they can be bent with a pipe bender. Thus, the pipes will remain intact, there will be no need to cut them, which will increase the service life of the pipes.

Expander

With the help of an expander, the necessary expansion of the holes inside the pipes for permanent connections is made.

Connection methods

There are several ways to connect metal-plastic pipes, which are the most best options, providing complete sealing at the joints of the pipeline, which means efficient and trouble-free water supply.

But in order to use one or another method of connecting pipes, you must first properly prepare a place for their installation and take into account all the important rules for installing metal-plastic pipes.

Preparatory work consists in planning the place where the pipeline will be installed. To do this, all dimensions are calculated and all lines are drawn on the walls or floor, where exactly the sections of pipes, their corners, adapter fittings and other components will be placed.

Important! The beginning of each pipe line should be laid from the water point to the faucet, drain tank or radiator. The number of corners, tees or crosses should be as small as possible, otherwise a lot of them will slow down the flow of water, and, accordingly, the pressure.

All connecting sections of the pipeline in without fail should be located in accessible places because they require more frequent revisions and repairs. After the preparation is completed, the assembly of the entire pipeline begins.

Connection with press fittings

In places of turns, corners and various transitions, devices such as fittings for connecting metal-plastic pipes are used, which firmly fix the connected sections of the pipeline.

This device is especially useful when it is required to attach the ends of pipes. different diameters. Therefore, fittings that connect pipes with the same diameter are called straight, and those that connect the ends are transitional.

Press fittings together with the entire piping system can be laid in concrete screed, which is much more convenient in the installation of underfloor heating, for example, compared to compression fittings. They come in these configurations:

Nipple with internal thread	Male Nipple (transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 26×1; 32×1	Coupling 16; 20; 26; 32
Elbow with female 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	square (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	Male tee (transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 26×1; 32×1	16; 20; 26; 32 Reducer tee from 16–20–16 to 26–32–26
cross 16; 20; 26; 32	Square (water outlet) 16×1/2; 20×1/2	double square for fastening mixers and other appliances 16×1/2; 20×1/2

Various connections with press fittings help to connect the pipes to each other in such a way that later the connection is one-piece - this ensures complete sealing of the installation, and hence the efficiency of water supply.

Such instances are, as a rule, press fittings with steel or brass ferrules, as well as fittings with a compression and sliding collar.

The connection of metal-plastic pipes with a crimp press fitting usually occurs in the following sequence:

• cut off the pipe right size pipe cutter;

• we process the edges of the cut pipe with a caliber;

• we insert the fitting using rubber o-rings (for electrocorrosion);

• we crimp the coupling with electric or manual press tongs. When working with electric tongs, never keep your fingers on the metal parts of the clutch or the tool itself. Work exclusively with rubber gloves and hold the device only by its special plastic handles;

Connections of this kind are based on couplings that need to be tightly clamped, and therefore they are considered the most reliable and can be safely used in hidden-type pipeline communications.

Important! The most important rule in working with press fittings is a one-time compression of the coupling, re-clamping it with press tongs will lead to cracks, thinning of the material, and then failure of the entire pipeline system.

Connection with compression fittings of pipes made of metal-plastic

Compression fittings are the simplest mechanism that consists of a fitting, a split ring and a union nut. That is why such a pipe connection is considered unpretentious and economical because it does not require the use of additional special tools.

It is enough to use an ordinary wrench, and if necessary, at the junctions with compression fittings, the pipeline can be easily dismantled and the necessary repairs of pipe parts, replacement of gaskets on the fitting fitting and other work can be carried out.

Connections using compression fittings are as follows:

When choosing compression fittings, be sure to pay attention to their manufacturer. It is best to choose fittings from the same manufacturer as the metal-plastic pipes you bought.

Because many manufacturers produce fittings that do not match the diameters and may not fit your pipes. During the installation of the pipeline with the connection of compression fittings, no press tongs or any other tools are required.

It is enough to use a wrench and, if necessary, a pipe cutter.

With the pipeline already installed, the third pipe with a compression fitting is connected as follows:

• Mark with a simple pencil on an existing pipeline, a pipe cut point where a third pipe will be inserted;

• we put a corrugated insulation on the pipe (if necessary, but usually this is done so that the pipes do not fog up and condensation does not form on them);

• calibrate the ends of the pipe (mandatory item);

• we put union nuts and o-rings on the ends of the pipe, and then insert the fittings;

• screw with wrenches nuts fastening pipes with fittings.

For the convenience of working with compression fittings, the length of the pipe sections before and after the cut should be at least 10 cm.

Important! Pipes must be cut at a right angle and then calibrated by all sides of the caliber: first, 1 mm of the lead-in chamfer is removed, and then the second side is removed to the mark-risks.

Moisten the fitting slightly before placing the pipe on the fitting. When tightening the nuts, do not over-tighten them, because this can quickly strip the threads.

With sliding fittings

Sliding fittings are also not difficult to install, like the previous types of connections. First, the pipe is cut in the right place. Then a sleeve is put on its end (or two sleeves are put on two ends).

Therefore, the end of the pipe is treated with an expander in order to slightly expand the hole in the pipe. Next, the pipe is installed on the fitting, the coupling is clamped with press tongs and pressed onto the fitting.

Here, an important element and feature of the installation is the principle of pressing the sleeve or coupling of the sliding fitting onto the end of the pipe expanded by the expander, which is put on the fitting.

When you put the compression sleeve on the end of the pipe, it is very important to press the pipe to the fitting as tightly as possible. This is what will ensure the tightness of the connection.

Such methods allow you to make pipe connections without welding, glue or any questionable connections, and also to maintain the integrity of the entire pipeline in the future.

Connection of metal-plastic pipes with metal

From time to time, practice shows that when replacing plumbing in some places, it is necessary to attach metal-plastic sections of the pipeline to metal pipes.

Here accuracy and precision in the execution of all step by step recommendations. The most common way is to use it when connecting a metal-plastic pipe to a metal compression fitting.

The work should be done in the following sequence:

• spin with open end wrench on a metal (derusted if the pipe is old) pipe fitting. In order to avoid any future leaks, use old way- tow and paint. It is necessary to impregnate the tow with paint and wind it on the thread of the pipe with a thin layer, and then wind the fitting onto its end;

• now start working with the metal-plastic pipe while the paint on the metal dries. Put a press washer together with a nut on the end of the metal-plastic pipe and calibrate the pipe;

• further, put the end of the metal-plastic pipe on the cone screwed to the metal pipe;

• use the open-end wrench again and tighten the nut so that the washer tightly compresses the metal-plastic pipe.

With polypropylene pipes

In those places where there are connections to boilers, washing machines, heating geysers and other connections that do not require the installation of massive pipes are most often used polypropylene pipes(PPT).

Such pipes are also called plastic because they are made of almost the same plastic. Possible options for connecting such pipes to metal-plastic pipes also provide for such devices as fittings.

These connecting elements show themselves perfectly both in connections with metal pipes and metal-plastic ones.

Coupling with internal thread (transition to pipe fittings)	Coupling with male thread (transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 25×1; 32×1	Coupling 16; twenty; 25; 32 etc.
Elbow with female thread (transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 25×1; 32×1	Elbow with external thread (transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 25×1; 32×1	Elbow 45, 90° (connection of two polypropylene pipes) 16; twenty; 25; 32 etc.
Tee with internal thread (transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 25×1; 32×1	Male tee (transition to pipe fittings) 16×1/2; 20×1/2; 20×3/4; 25×1; 32×1	Tee with identical fittings 16; twenty; 25; 32 etc. Reducer tee transition to different diameters
cross 16; twenty; 25; 32 etc.	Square (water outlet) for fastening mixers and other appliances 20×1/2; 25×1/2	Pipe bypass for bypassing another pipe when mounting in the same plane

with heatsink

The principle of connecting metal-plastic pipes to radiators mainly consists in the use of special adapters and fittings already familiar to us.

There are also several schemes for connecting pipelines and risers to radiators:

• the bottom-down scheme is used for hidden piping in the floor. In the presence of thermostats and valves, special adapters must be used that would firmly fix all the necessary connections;

• lateral connection also requires the use of adapters, chrome-plated or brass tees with metric threads;

• connection with exit from the floor. With such a connection scheme, the “run-up” of the vertical front pipes is effectively provided by a telescopic fitting;

• corner connection, or "diagonal" scheme. Not only with this method, but also with others, swivel knees are also used if necessary.

With tap

Just as we considered the connections of metal-plastic pipes with various other pipe materials and types of plumbing, in the same way, connections of metal-plastic pipes with taps are used.

Fittings are also used here, pre-calibration of the end of the pipe and connection in this order:

• you need to unscrew the connecting fitting;
• remove the plastic or metal clamp nuts and o-rings;
• we put on the clamping nut and sealing rings on the metal-plastic pipe;
• tightly insert the pipe into the fitting;
• tighten the sealing ring and tighten the clamping nut;
• the other end of the fitting is connected to a check valve, which is pre-installed to the inlet of the faucet itself.

With flexible hose

Such connections are usually made where water supply is required to a washing machine, boilers and other appliances and structures. Fittings here should be used with fittings that are specifically designed for flexible hoses.

Important! Also, a nut must be provided at the end of the water hose, which will fasten the entire connection to the fitting.

You need to pay attention to this when buying this or that hose for your future system.

How to disassemble

It must be said right away that not all types of connections can be disassembled without damage and replacement with new connecting elements.

It depends on which technology for connecting metal-plastic pipes was used, which, for example, fittings were used to connect certain sections of the pipeline.

If press fittings or fittings with slip-on sleeves were used, which were then pressed using press tongs, then such connections are considered non-separable, and therefore they will be replaced, if necessary, by complete dismantling and cutting off this section with pieces of pipes.

Then you need new components for connecting fittings, as well as an additional piece of pipe.

If connections were used using compression fittings, then it will not be difficult to unscrew the clamping nuts. And, therefore, it will be easy to disassemble the entire area where the pipes are connected.

If it flows

To eliminate leaks at the joints, you must first find and determine the cause and nature of the breakdown.

• check that the connecting nut is not loosely screwed on and slightly tighten it until it stops, but not much so that the thread does not burst and break;
• turn off the water supply, unscrew the fitting and check whether the pipe fits snugly into the fitting or whether the pipe fits snugly when it was pushed onto the fitting. If just such a problem is found, then the pipe must be stuck in until it stops, and then also screw everything in the reverse order. But this only applies to collapsible connections;
• if you have a compression fitting, then check if the compression sleeve fits snugly and if not, then press it again with press tongs. Only here, do not overdo it, so as not to damage the surface of the metal and prevent it from crumbling or cracking;
• if you calibrated the end of the pipe with a knife, then the water will flow and seep through the rubber bands of the fitting, which cannot fit snugly and move out. This malfunction can be easily eliminated by disassembling the connection and calibrating the end of the pipe with a caliber until smooth and reinstalling everything in the reverse order;
• if the sealing rings are worn or worn out, then they should be replaced.

Having carefully studied and considered all possible options connections of metal-plastic pipes using fittings and all kinds of tools, you can easily fix one or another unfavorable situation with your water supply in the house or repair the pipeline yourself.

Careful preparation for work will also help you repair or install a metal-plastic pipeline yourself and at the highest level.

Video: Secrets