Connection of metal pipes with compression fittings. Couplings for connecting polyethylene, plastic and steel pipes. Connection of metal-plastic pipes with metal

When connecting and repairing metal pipes, as a rule, use a threaded joint or welding. But in some cases it is not possible to cut a new thread, and welding work is extremely difficult to perform due to the increased fire hazard or inaccessibility of the junction of different sections of the highway.

In addition, these works require significant financial and time costs, and in this case, pipe connection methods are used without welding and threading, which provide a reliable and durable result without big investments and in as soon as possible. We will briefly describe these methods.

Metal pipes have a certain service life, and they are especially susceptible to corrosion in the area threaded connections at high temperature liquids. Sometimes, due to Low quality material, fistulas occur in the body of the pipes, which require emergency repairs, and in cast iron sewer pipes ah, cracks and chips from mechanical stress can occur.

Force majeure requires rapid response which provides reliable repair of gas, water, heating and sewer pipes without threading and welding. In industry, there is experience in such a connection of gas and oil pipelines, which provides not only a tight connection, but also the absence of corrosion on the butt parts.

The need for prompt and quality repair, as well as the implementation of a tie-in with a branch from the main, pushed the engineers to a number of design solutions. The basic principle of each of them is the connection of pipes without welding, providing a tight and durable connection of joints, even at high pressure and hot media in the system.

This process is carried out using the following most popular devices:

• repair work with a clamp, this way you can fix the plumbing problem, sewer system and even repair the pipe of the car;
• bolted flange connection with rubber gaskets;
• repair and assembly clips for water supply systems;
• Gebo coupling or compression fitting that allows you to connect sections and make branches from the main pipe, where the carrier temperature is not higher than 80 ° C with the possibility reuse;
• installation of pipes, swivel elements and branches using press fittings that compress pipes using press tongs and provide high strength and tightness of a one-piece connection.
• trunk connections based on sealed heat-shrink sleeves using special equipment.

When choosing, it is important to pay attention to the intended use of the product, since it can serve either as a temporary repair device or be of a permanent operational nature, and its cost also depends on this.

Unlike welded pipes, joints based on seals do not require special cutting of the ends, but only need to be cleaned from dirt, bumps, rust and metal burrs in order to ensure the tightness of the joint.

Jointing pipes with clamps, flanges and clips

The simplest devices for quick repair and pipe joints, usually bolted and consist of two parts that are put on the pipe and fixed in place with a rubber seal. Exception is flange connection gas pipes, which is bolted through rubber gasket in order to replace a section of the highway.

Replacement of metal and plastic sewer drains during repair is also based on the replacement of damaged areas with the installation of rubber seals without tightening because there is no pressure in them. Here the main thing is to prevent leakage, water flowing by gravity and the appearance of odors.

Quick tapping or repair with clamps and clips is not completely reliable, especially in systems with high media pressure and temperature, and is a temporary measure. Clamps various designs are one-piece or split tubular structures and are tightened through the gaskets at the breakthrough points with the help of bolts.

They are designed for the diameter of all used pipes up to 1520 mm and are available as single, double or triple. Differ quick installation on the damaged area, but require accurate and consistent tightening of the bolts without distortions and deformation of the seals.

The connection with repair clips is more reliable because they are a cast body made of painted metal, consisting of two detachable parts. This method also uses a rubber thick-walled gasket, and the two parts are bolted together.

Installation of clamps and clips is carried out in the following sequence:

• the emergency area must be thoroughly cleaned of metal chips, irregularities, rust and other contaminants;
• in the case of a clamp, a rubber pad is wound around the damage site and sealed;
• if a repair clip is mounted, then put on rubber compressor, the cut of which is lubricated with a silicone sealant;
• then the bolts are tightened sequentially and without distortions, in the case of a cage, crosswise.

Repair clips allow for a cross-shaped or T-shaped tie-in, and are also used when connecting two sections of the pipeline.

During installation, it is important not to skew the seal, not to overtighten the bolts, and after supplying fluid under pressure, re-verify the effectiveness of the repair and the tightness of the connection.

Connecting metal pipes with press fittings and couplings

The system of press fittings allows for strong, tight and durable connections of pipelines for various purposes, up to heating, and is designed for high pressure and carrier temperature. Also in the assortment there are tees and swivel elbows with an angle of 45 ° and 90 °, and if there is equipment for freezing, it is possible to quickly and efficiently connect new radiators directly to heating season. A significant disadvantage of this system is the high cost of equipment, because this method requires the use of a special tool for crimping the fitting or pressing tongs.

More simple solution problems of joining steel, cast iron and plastic pipes is the application split couplings UR-01 with bolt seal on both sides. These products serve for connections of pipes with a diameter of 50 to 300 mm and hold pressure up to 16 atm. Couplings are equipped with polyoxymethylene expansion rings with bicromet type retainers, and the body and clamping covers are made of high-strength painted cast iron. O-rings are made of ethylene propylene rubber, and the whole design allows you to compensate for slight angular deviation, withstands water hammer and protects against tensile loads.

The low-cost split solution also includes the Gebo compression coupling, which is available in single-sided and double-sided versions and allows for tie-ins and corner joints. It consists of the following main parts:

• the main one- or two-sided strong case;
• sealing conical rubber ring;
• metal clamping ring;
• split clamping ring with a notch for fixing on the pipe surface;
• a threaded nut that provides clamping, tight sealing and fixation of the entire structure.

When assembling, it is very important to follow the assembly sequence of the Gebo coupling and correct installation taper parts according to the factory instructions.

In a double-sided version, the coupling has compression rings on both sides and serves for threadless connection of two parts. The assembly process is extremely simple, but requires effective cleaning the installation area from rust contamination and metal chips. Reliable fixation in terms of strength and durability is not worse than threaded connections and is ensured both by the friction of the sealing gasket and by fixation on the pipe body using a compression ring. One of the advantages of this design is the possibility of reusing this element with the replacement of the rubber ring with a new product.

What do we end up with?

The methods of connecting pipes without welding and threads that we have considered are a quick opportunity to eliminate a breakthrough in the hot and cold water supply and sewerage system. The correct formulation of the problem and the competent choice of the product will provide you with troubleshooting and significant cost savings in an unforeseen situation that can occur in every home.

When assembling water supply and sewerage, it is required to ensure the reliability and tightness of the system. The most critical places are pipeline branchings, element connections along the length, connection points to plumbing fixtures, direction change areas. Recently, polymer pipes have taken a leading position in the market due to their characteristics. In order for them to “show themselves in all their glory”, you need to select the appropriate connecting elements for them.

The structure and principle of operation of the fitting

The principle of operation lies in the name. Compression is a word derived from the Latin root, which translates as "compression". Tightness is ensured by crimping. The main load is taken by the thrust (compression) rings. This element prevents the movement of the pipe in any plane, does not allow spontaneous unscrewing of pipeline parts.

The compression fitting includes the following items:

• The body, on which a pipe stop and thread is provided, is of trapezoidal section.
• The sealing ring (gasket) is installed between the body and the pressing sleeve. Production material - rubber. The product ensures the reliability and tightness of the connection even when the pipeline is bent.
• Clamping (crimping, compression, thrust) ring prevents any movement of the pipe.
• The pressing sleeve limits the deformation of the pipe. Made from the same material as the body. The part securely fixes the sealing gasket.
• A clamping nut (cover) is a part that has an internal thread and external grooves in order to provide convenient tightening.

Benefits of using compression fittings for polyethylene HDPE pipes

• used for various materials pipes;
• resistance to corrosion (rust) due to the absence of metal parts;
• safety, used for drinking water supply;
• connections are disassembled up to 10 times, which allows us to talk about reusable use;
• repair is performed by replacing a failed part;
• strength and reliability;
• to temperature changes, chemical influences;
• fittings for the compressor are easy to install, they will not cause problems during installation and do not require special equipment;
• wear resistance and resistance to mechanical stress.

Types of products made of cross-linked polyethylene, connected by a crimp key and a coupling

The classification is made depending on the area that requires the installation of connecting elements. The types are as follows:

• couplings for connections along the length;
• tee for creating branches;
• corner (knee) for changing the direction of the pipeline;
• t-shaped connections for branches;
• plugs.

Types of compression fittings are also distinguished depending on the material of the pipes and the connecting products themselves. metal types connecting elements are made of nickel-plated brass, copper, steel. metal fitting suitable for the following types of pipes (material for the manufacture of fittings is indicated in brackets):

• installation of outdoor engineering networks(brass with nickel-plated);
• metal-plastic (used brass with nickel);
• copper (copper, steel, brass);
• steel (steel, brass).

Advice! The metal compound is mainly used in carrying out repair work. For example, when it is required to replace a section of a metal pipe with metal-plastic, it is reasonable to use swaging products.

In addition to metal, products are made from polymers. It is better to choose products from the same material from which the pipeline is made: polyethylene - for polyethylene pipes, polypropylene - for polypropylene. If you need to connect polymer pipes with other material, select plastic products with metal internal thread. Compression fittings are able to withstand high pressure on the pipeline connections.

How to choose steel external fittings from Wak manufacturer

• Before going to a specialized store, they draw a plumbing diagram that will allow you to understand how many fittings and what design will be required.
• Pipes and fittings are selected so that they are made by the same manufacturer.
• When choosing, pay attention to outside diameter and wall thickness. The SDR parameter shows the ratio of the pipe wall thickness to the outside diameter of the pipeline.
• The seller is required to present certificates of quality and passports for products. Even if you buy inexpensive parts of unpopular brands that have all the necessary certificates, you can be sure of their quality and reliability.

The price of compression fittings depends on:

• product diameter;
• material;
• assignments for various sections of the pipeline;
• manufacturer.

For brass, the following values ​​\u200b\u200bcan be given:

• domestic producers 50-500 rubles apiece;
• foreign manufacturers 250-2500 rubles apiece.

Plastic fittings are cheaper. The price also depends on the presence of metal inserts in the element. The price is in the range of 20-1600 rubles apiece.

WATCH VIDEO

Technology for the correct installation of copper, brass fittings with threads for metal-plastic pipes

Installation of compression fittings is carried out in the following order:

1. Piping assembly begins. Cut pipes. For cutting pipes from different materials select the appropriate tool for the job. Cutting is done at a right angle.
2. Round off the edges. At the same time, burrs and irregularities are eliminated. Defects and the presence of contaminants on the surface of the pipe, which is inserted into the body of the fitting, are not allowed.
3. Remove the nut from the connecting part and put it on the pipe. After that, the installation of the ferrule is performed. The thickened part of this part turns towards the tail of the pipeline.
4. A part of the pipeline is installed in the fitting, while the clamping ring advances to the stop.
5. Tighten and tighten the nut (first by hand, and then with a tool).

Compression fittings must be of the highest quality possible.

When creating pipelines, regardless of type and purpose, couplings are used to connect pipes. The technology of their installation directly depends on the materials from which pipe fittings are made. Let us consider in detail all its types that do not require welding.

When pipes are installed metal-plastic type, crimp connectors are practically not used, with the exception of their variety - adapters. With their help, the transition to a pipe thread is carried out.

As a rule, this type of pipe fittings is installed after the inlet valves installed in the riser of the apartment, this is done using adapters.

The installation technology is as follows:

• First of all, it is necessary to ensure reliable sealing of the thread; for this purpose, a special sealant (FUM tape) is wound around it;
• applying moderate force, the coupling is screwed on, an ordinary adjustable wrench is used as a tool;
• at the next stage, a chamfer is removed inside the pipe, after which a nut is put on, then a split-type ring;
• the fitting is inserted into the fitting, holding its body with one key, with the second they begin to tighten the nut until it stops. As a result, the pipe is tightly connected to the fitting.

In those rare cases when it is necessary to connect pipes using a coupling, the installation process is carried out according to the described principle, with the exception of the threaded connection.

HDPE fittings

Fittings used for polyethylene (HDPE) or polypropylene pipes, is a thick-walled tube. Its internal diameter should be such that the pipes enter it with little effort.

The connection is made using soldering, in the sequence below:

• chamfers are removed from the pipe and coupling;
• the level is set operating temperature at a soldering station, usually in the range from 260 to 280 ° C;
• nozzle is selected, the diameter of which is suitable for connecting fittings;
• cleared reinforced layer(if it is used outside a shaver, inside - a trimmer);
• the pipe and sleeve are inserted into the appropriate nozzles, and the soldering station is turned on;
• after the surfaces have melted, the pipes are inserted into the connecting fittings and held for about 10 seconds until they are securely fixed.

You must not allow scrolling during the connection process, because because of this, with big share probability that the integrity or tightness of the structure will be violated. The price of connecting fittings is low, it is possible to install flexible couplings, but for installation you will need to buy a cold soldering station.

PVC pipe fittings

The coupling for this type is a short pipe, which has two sockets, with rubber seals on them.

The assembly of plastic sewer pipes is not difficult, all that needs to be done first is to remove the external chamfer from them and get rid of the burrs. If a situation arises in which the rubber rings do not provide the required density, a silicone-based sealant may be used.

If it is planned to carry out domestic sewage using Korsis two-layer pipes, then they will require a special coupling, the installation principle does not change.

Cast iron pipe fittings

Compound cast iron pipes can be done with two different ways:

• using a coupling on which rubber seals are installed. The installation of such a connection is practically no different from the assembly of a plastic type sewer;

• using the technology of caulking joints, a drawing diagram of such a connection is shown in the figure.

Installation features using this technology require little explanation of the process:

• To make such a connection, you need to provide full access to any part of the installed structure. Problems may arise when the installation is carried out close to the wall, in which case it will be necessary to hollow out part of it;
• the chasing of the joint is made by a special sealant - a cable. It is a fiber organic origin, which is impregnated with oil;

Kabolka for chasing

• before proceeding to chasing, you need to make sure that the reinforcement has entered the sleeve for maximum length, otherwise the seal will fail;
• the cable is stuffed into the joint evenly around the circumference, making several turns. For minting, you can use homemade tool, for example, a piece of reinforcement flattened at the end, its photograph is presented below.

• clogging the space at the joint by two-thirds with a sealant, the remaining space is filled with a cement-based mortar.

Steel reinforcement

If it is required to connect metal (steel) pipes, a compression or threaded method is used. Each of them has its own characteristics.

Threaded type pipe fittings

For the manufacture of threaded couplings, black or stainless steel grades are used, but brass and cast iron are best suited, we will explain the reasons for this a little below. Connecting pipe fittings have the shape of a cylinder, inside of which a pipe thread is cut.

The installation process comes down to screwing threaded pipes into the coupling, we described the method of sealing it earlier.

It is not recommended to make all connection elements steel, since during operation they can “stick” to each other, which will lead to problems during repair. That is why for this type of pipe fittings it is better to use cast iron or brass.

Compression connection

Compression couplings are equipped with union nuts and sealing rings, which provide the necessary tightness to the connection. To positive aspects This design should include the following features:

• no need to cut the thread;
• the coupling can be reused;
• easy installation and dismantling, which is quite convenient for repair.

Despite the fact that threadless connections are characterized by low mechanical reliability, they have found application in non-pressure plumbing systems with low pressure.

Video instruction: installation of the compression sleeve

Asbestos-cement pipe fittings

This type of asbestos pipes can be connected through a coupling or socket. Used as connecting fittings the following types couplings:

• double-breasted asbestos-cement;
• non-pressure chrysotile cement;
• cast iron "Zhibo" (for pressure systems).

The requirements for this type of connection are regulated by GOST 539-80. Since the technology for installing asbestos-cement pipes is quite complicated, it does not make sense to bring it within the framework of this article.

Other types of mounting

Speaking of pipe fittings, it is necessary to pay special attention to Victaulic couplings used for non-welded connection of any materials. This type, due to its features, can be used with various types pipes, for example, for connecting metal hoses or brake pipes in hydraulic equipment.

In the process of repairing a water supply today, metal-plastic pipes are very often chosen. It's no secret that pipes made of metal-plastic are much more durable and more convenient to use than their metal counterparts. In this article we will tell you how to install plastic and metal.

But not everyone knows how to connect metal-plastic pipes with metal ones. Wherein this operation quite simple and within the power of anyone home master.

Installation of pipes made of metal-plastic

Before laying plastic pipes, they must be unwound from the coil. In the case when the coils were in the cold, they must be kept for about a day in a room at a temperature of at least 15 C. When unwinding, make sure that the pipes do not twist.

Stretching must not be created during installation. When laying to dirt and debris did not get inside the pipe, plugs must be put on its ends. Usually, plastic products are laid in special shafts, furrows or channels, from where it is necessary to provide access to all detachable connections and fittings, for this you need to install removable doors and shields.

Due to the elasticity of metal-plastic, installation heating systems and water supply systems can occur either according to the collector, or according to the classical tee scheme. Laying plastic pipes is as simple as possible, since during the installation the number of connections is minimal.

How to connect a plastic pipe to a metal

The most popular options connections metal-plastic pipes with metal are as follows:

• using press fittings;
• with compression fittings.

The first of these connection options is divided into two more:

• using a press fitting, which belongs to the sliding type;
• using a compression fitting.

Mounting tool

Installation of metal-plastic pipes is a very simple procedure that does not require special tools. When connected compression fittings for installation you may need:

• pipe cutter, it can be successfully replaced with a hacksaw;
• wrench, and the usual tools that are always in the kit of any master.

When connecting with press fittings to these tools, you still need add press tongs and expander, it is used to increase the hole in the metal-plastic pipe.

Fitting

The connection of pipes made of metal-plastic with metal occurs with the help of special devices called fittings. They may have different configuration and secure both in a linear plane and at an angle of 90 degrees. Compression fittings (under the clamp) are the most popular among craftsmen. Press fittings (for pressing) are also very often used.

The pressing and connection of plastic with a fitting for a clamp occurs by screwing in a union nut. In press fittings pressing takes place by compressing the outer sleeve, and is done with a special tool.

The design of the fitting is very simple. The fitting consists only of a ring, a nut and a fitting. To work with these compounds, you do not need any special tool and any experience. All work is done with a simple wrench.

The advantage of these fittings is that, with the simplest installation, they are also very easy to disassemble. But, their disassembly is undesirable, because in this case it is imperative to replace the gasket, but at the same time, you can use this advantage of the fittings, which consists in the possibility of dismantling them, since you can pick up any gasket today without much difficulty.

Fittings are used not only for laying plumbing systems, but for their repair. If found defect in any part of the plumbing, then it is simply removed, changing to a new section, which is attached using the same fittings. This approach avoids the dismantling of the entire plumbing system.

Size of damaged threads should not be more than 10% of the total length. The ends of the fittings must certainly be even and perpendicular to the axis of the product itself. Burrs are not allowed on the thread.

Depending on the connection option, fittings are divided into pressing and screw fittings.

Tightness, when using screw connections, is ensured by pressure, appearing on the expansion ring when the nut is screwed in. A special gasket is installed to create a strong connection between the fitting and the ferrule.

Fastening metal-plastic pipes with metal ones using compression fittings

Before connecting the pipe to the fitting, its end must be cut so that the cut is perpendicular to the axis of the pipe. It is advisable to use a special pipe cutter for this.

But this procedure can be done quite successfully with a hacksaw, but make sure that there were no nicks or tatters along the edge. The cut will be cleaner if you install a new blade on a hacksaw. A jigsaw is not suitable for cutting, it will not provide such accuracy.

When preparing for work, you need to consider one nuance. European products in the field of manufacturing pipe products Dont Have common standards, therefore, the dimensions of parts from different manufacturers may not be compatible. So it is necessary to strive for pipes and fittings to be of the same manufacturer. If this is not possible, then when going to buy fittings, you need to take a piece of pipe with you to compare the wall thickness and dimensions. In addition, you need to know that there are one-piece fittings on the market.

Before attaching the pipe to the fitting, its cut end must be machined and aligned, and a fine chamfer must be made to smoothly connect the pipe and fitting. Burrs must be removed inside the pipe. After that, a ring and a nut are put on the pipe. Only then can you put the pipe on the fitting. The nut is put on only by hand, without the help of a wrench. certain time the nut will turn on easily if there is no misalignment. At the end, you need to tighten it with a key, while remembering that the pipe is made of plastic, as a result of this, the booster needs to be made quite soft.

Fastening metal-plastic pipes with press fittings

Connection with press fittings is done very often. This makes it possible to install underfloor heating, water supply and heating systems. The advantages of this type of connection are that this plumbing can be installed under concrete or drywall, and that the amount of fittings used is reduced, which reduces the cost of plumbing.

Fastening with press fittings includes the following work:

• cut off part of the pipe right size;
• with the help of a calibrator, the chamfer inside is removed and the roundness deformed during cutting is restored;
• a clamping sleeve is installed at the end of the pipe;
• a fitting fitting with sealing rubber rings is attached;
• with the help of press tongs, the coupling is clamped, as a result, convex rings appear on the coupling, and the metal bends.

It must be remembered that clamping the coupling with press tongs is done only once.

Fastening with slip-on couplings

In this variant for work there will be pressing tongs and expander are required, it serves to expand the hole inside the pipe.

During the process, the following order of work is observed:

• a part of the pipe is cut off, where the coupling is put on;
• the end of the pipe is processed with an expander;
• the pipe is placed on the fitting;
• the coupling is pressed on the fitting with press tongs.

How to choose press tongs

Since pressing tongs are important tool, then their right choice will ensure the proper quality of all ongoing installation work. Most manufacturers mounting tool for pipes do both professional and standard views this equipment:

• Electrical;
• hydraulic and so on.

With a one-time laying of water supply, it is enough to choose manual press tongs, as a professional tool will cost you much more, and when working with this tool you need to have certain skills and special skills.

According to experts, in terms of the quality of the fasteners made, manual press tongs are no worse professional tool. They are very easy to use and work with them is not particularly difficult.

Before you buy press tongs, you need to find out the maximum cross-section of the pipes that will be installed in the water supply system, and taking into account this parameter, choose suitable tool. Need to know what for fixing smaller pipes additional tabs must be attached to the press tongs.

The main mistakes when attaching plastic pipes

As we said above, connecting and laying metal-plastic pipes is a fairly simple procedure that any home craftsman can do, even without special experience in this area. Wherein knowledge of basic mistakes, which are allowed during the performance of these works, will make it possible to ensure the reliability of the installed water supply.

The main mistakes are:

• poor processing of the trimmed part is fraught with poor tightness of the installed system;
• an attempt to exhaust the bay cold pipe, this can violate the integrity of the walls;
• multiple installation and dismantling of threaded fasteners without replacing seal gaskets;
• pinching of the thread connections, which leads to its deformation;
• an attempt to repeatedly clamp the fastener, which leads to a violation of integrity.

Summarizing

So, as you can see, laying a water pipe from metal-plastic pipes, which are reliable and inexpensive material, matches all hygiene standards, may well be made by any home master, even without great experience. The quality of the assembled water supply will depend only on the accuracy of the person involved in this process and on his compliance with the rules and installation procedure.

To save money during the installation of pipelines, the connection of metal-plastic pipes must be carried out in accordance with binding rules. Despite the fact that the price of components for this type of pipe is significantly higher than for polypropylene counterparts, metal and plastic pipes today continue to be widely used in the construction of water pipes 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 of a product.

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

Connection of 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 supposed to use special compression 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 do the job.
• The compression fitting can be disassembled and reused if necessary.

Operating procedure:

1. prepare a pipe of the desired length;
2. align the section of the workpiece at a distance of 10 cm before and after the cut line,
3. cut the pipe according to the markup using precision scissors, which are placed at right angles to the axis of the pipe;
4. check the integrity of parts and gaskets;
5. put on the nut, and then the ring from the fitting;
6. process the end of the pipe with a reamer - the inner chamfer is removed with the calibration side, and the outer chamfer with the other side;
7. use fittings for connection (the pipe must be pushed onto the fitting until it stops);
8. tighten the union nut on the fitting manually, and then with a wrench so that 1-1.5 turns of the thread remain free.

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

Connection with special press fittings

There are ways to connect metal-plastic pipes that allow you to perform quality installation underfloor heating systems, and hidden communications. One of them is to ensure the connection of metal-plastic pipes using press fittings. Such a connection is more reliable than the option when compression parts are used. To get the job done you will need special tool – .

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

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

1. check the presence of sealing rings in the fitting, as well as the presence of a dielectric gasket;
2. put a compression sleeve on the edge of the pipe;
3. put sealing rings on the fitting, and insert it into the pipe;

1. crimp the steel sleeve using press tongs (this tool should include liners for pipes of different diameters). When crimping a steel sleeve, make sure that the rim of the sleeve is in the recess of the press nozzle.

When making a press connection of metal-plastic pipes, it is undesirable to crimp the steel sleeve twice.

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

Connection using sliding fittings

With this method of connecting pipes, in addition to pressing tongs, an expander will be required to expand the diameter of the pipe. The result is a permanent connection. It can be used when concealed installation pipelines, including when pouring concrete.

When carrying out work, it is necessary:

1. cut the pipe
2. put a sleeve on the edge of the pipe;
3. expand the edge of the pipe with an expander;
4. put a fitting on the edge of the pipe;
5. clamp the clutch with a press;
6. the fitting is tightened onto the fitting, providing a reliable tight connection.

The use of a hybrid connection of metal and multilayer pipes

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

For such work, you will need a caliber, as well as 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, cuff and cone must match the metal-plastic pipe.

The work is carried out in this order:

1. tow must be wound on a metal pipe;
2. screw a fitting onto it;
3. on metal plastic pipe put on a washer with a nut;
4. calibrate the edge of the pipe, put it on a cone screwed to a metal pipe;
5. using an open-end wrench, carefully tighten the nut (at the same time, the washer tightly compresses the metal-plastic pipe).

It is possible and necessary to qualitatively perform the connection of metal-plastic pipes on your own. However, all work should be carried out in such a way that the connection technology is accurately performed. Wherein Special attention need to pay and .