The sewer system is one of the most important communications in the house. Previously, its wiring was carried out using metal components, but they have their own rather significant drawbacks. Therefore, drainage is now increasingly carried out using plastic pipelines. Metal installation plastic pipes Easily done with your own hands without the involvement of specialists.

Benefits of using plastic

Metal communications were the most popular a few years ago. They have high levels of rigidity and strength, are durable and do not require maintenance. But at the same time, the metal is susceptible to corrosion, which is inevitable in sewer system. On steel and cast iron pipes under the influence of chlorinated water, various mineral “plugs” are often formed, which negatively affect the entire operation of the wastewater.

Photo - sewerage installation made of metal-plastic

Advantages metal-plastic pipes:

1. Excellent durability. They do not rust and salts do not accumulate on their inner walls. Apart from this, they also facilitate the disposal of solid waste;
2. Frost resistance. Unlike conventional plastic analogues, such pipes do not crack due to temperature changes or when water freezes in them. They also do not deform;
3. Easy to install. The technology for installing sewer plastic pipes does not require the use of complex devices, for example, heavy welding inverter, they can be embedded directly into the desired location of the line using a simple fitting or adapter;
4. Availability. On this moment, the price of such communications is much lower than stainless steel ones. Sales are made in all cities (Samara, Moscow, St. Petersburg, Rostov-on-Don and others), they can be found in almost every plumbing store.

But at the same time, metal-plastic pipes for water supply require very careful handling. They are a layered material, where the first layer is a special polyethylene, the second is a reinforcing metal fiber, and the third is a rigid polymer plastic. These types of communications are very sensitive to sudden impacts or falls, so during installation you must follow certain rules.

In such communications there is hidden gasket, which increases the tightness of the system. If its integrity is compromised during installation, the sewer will begin to leak air, which will reduce its efficiency. You also need to comply with certain standards specified for the installation of any type of pipe in GOST R 50838.

Video: connecting metal-plastic pipes

Installation using fittings

The most popular devices for sewer installation are fittings. This is the node that represents the connector various areas pipes It can have any shape, depending on the needs: tee, coupling, square and others. In addition, pipe parts are now made from a variety of materials.

Photo - design of splitters

Instructions for installing screw units on pipes made of metal-plastic TER and PEX:

1. It is necessary to cut the metal-plastic communication into pieces. Please note that special pliers must be used to cut plastic, polypropylene and rubber elbows. They will help you get the job done as smoothly and quickly as possible. Of course you can use others possible options, but this may damage the inner layer;
2. Next, you need to prepare tees or corners for water supply. They are fitted with seals; they are often made of rubber, but there are also plastic models. These rings will help protect the sewer from leaks;
3. For further installation work You will need special devices - calibrators. They will help to fold the pipe opening in order to install fittings, but without bending the seal rings;
4. Experienced plumbers advise checking the pipe walls before starting installation. They must be completely smooth and clean; there cannot be burrs or other irregularities on the cuts. If there are any, carefully remove them using sandpaper and wipe the cut with an alcohol solution, which will degrease the surface;
5. Afterwards the fitting is installed into the pipe. You need to put a nut and a clamp of a suitable diameter on it. To do this, stretch the pipe a little using a calibrator and put it on the end of the “leg” of the assembly, push it inward and fix it at the required depth;
6. Make sure that the joint is completely level. After installation is complete, be sure to check its location in the pipe;
7. All that remains is to tighten the nut on the polymer or metal-plastic pipes.

Expert advice: Do not over-tighten the nut. Because of this, cracks in communications often arise. The installation requirements state that you need to tighten it sufficiently, but do not pinch it. As soon as the nut begins to crack, this means that it has already “sat” quite tightly on the metal-plastic.

Photo - types of nodes

Features of installation of press fittings

Metal-plastic pipes are often installed in an apartment or house using press fittings. Compared to ordinary ones they have whole line advantages. They are ideal for providing wiring and installation of heating systems, heated floors, heated towel rails and even gas pipelines. Their main advantage is that they do not require periodic repairs, unlike their screw counterparts.

Photo – press center

Tips for installing compression fittings:

1. The technological map requires cutting and stripping the pipe. This is very important stage, on which the efficiency of work depends. Communication can only be cut with special scissors;
2. Now using gauges, you need to open the pipe to the diameter of the nodes and chamfer;
3. A steel sleeve is placed on the pipe in the bathroom or toilet, and a fitting is inserted inside. If necessary, a sealing tape is installed;
4. Further installation is carried out by using special device. The press equipment clamps the sleeve and fitting, forming a “dead” mount, after which it will be possible to connect the manifold here. This perfect option for internal pressure pipelines that cannot be periodically tightened. But be careful - dismantling clamp fittings is quite complicated, so you need to carefully think through the plan and possible methods sewer branches.

You can buy such fasteners at plumbing stores. Good feedback about VALTEC and HENCO parts .

Before starting work, a sewerage wiring diagram must be prepared, otherwise, after installing fittings on metal-plastic pipes, you will not be able to change their location. Then, if necessary, you will have to cut the communication and reinstall it.

This way you can connect the pipe to an electric boiler or other heating household devices. If you need to bend the pipe when installing a press fitting, you will need to use springs. Eat different ways, the simplest is to put a stiff spring on the communication and bend it in the desired direction.

Photo - sewerage wiring diagram

You need to understand that in any case you will need a special tool for installing metal-plastic pipes. First of all, these are adjustable or wrenches, presses, soldering devices, etc.

If for some reason you cannot install metal-plastic pipes yourself, then you can contact specialists; the price of sewer installation depends on the complexity of the work.

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 pipes of a wide range of sizes - 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:

1. Sequential, when the entire system is connected in series, from one point of consumption to another.
2. , 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 pointwise 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 (domestic 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, the metal-plastic water supply system should be installed in one piece so that “extra” connections do not arise. 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 junction points it is allowed operating pressure up to 10 atm.

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

The connection technology does not involve welding or soldering:

1. First, you should cut the pipe, strictly maintaining an angle of 90 degrees.
2. The edge of the pipe needs to be processed (chamfered). This ensures that the pipe is adjusted to the required diameter.
3. 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.
4. You need to put a press clamp on 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 of 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 when partial replacement water supply or a metal-plastic pipe is connected to an old metal riser. To carry out connection work, you need compression fitting and calibrator.

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

Should be considered:

• sensitivity of the material to thermal, mechanical loads, as well as ultraviolet radiation - in practice this means that open wiring such pipes can be made only 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 connection fittings(if the fittings are screw type);
• if metal-plastic pipes are being laid through building construction, then they are also provided with sleeves so that they inner diameter was 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 carried out using one of the following technologies:

1. Bandage as a temporary repair method. You need to take a rubber pad, apply it to the leak area and secure it.
2. Temporary methods also include flange, into which the rubber gasket is installed.
3. Using sealant You can reliably cover up cracks and leaks, but this composition will also deteriorate over time.
4. Epoxy adhesive- 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.

Metal-plastic (metal-polymer) pipes are composite pipes made from polymer pipe, reinforced with metal.

They are strong, durable, easy to install, resistant to aggressive environments and are very often used in the construction of water pipelines, heated floors, transportation systems compressed air and various liquids (including chemically aggressive ones) for laying electrical wires and cables.

• outer protective layer made of cross-linked polyethylene;
• inner layer made of food-grade plastic;
• between the layers of polyethylene there is a reinforcing aluminum shell;
• aluminum and polyethylene layers are bonded together with adhesive layers.

Photo: structure of a metal-plastic pipe

This design provides unique properties metal-plastic pipes:

• metal-plastic pipes are easily bent, cut and hold their shape, thanks to the aluminum core;
• the outer and outer layers of polyethylene are highly resistant to corrosion and protect the inner shell of aluminum from moisture and aggressive environments;

These design features determine the ease and convenience of installation of metal-plastic pipes, their reliability, durability and wide application conditions.

Specifications

To the main technical specifications include:

• pipe diameter. Metal-plastic pipes with diameters from 16 to 53 mm are produced. Pipes with a diameter of over 40 mm are practically not used in residential construction; pipes with a diameter of 40 and 32 mm are actively used when laying out the water supply network in a private house. The most popular and cheapest pipes are 16 mm, fittings for them are much cheaper than others. However, they and 20 mm pipes should only be used in networks central water supply at normal pressure in the water supply network;

Photo: pipe diameters and table of pipe diameters for heating

• pipe wall thickness(can be 2 or 3.5 mm);
• permissible bending radius. Lies in the range of 80-550 mm with manual bending and 50-180 when using a pipe bender.

Photo: pipe bend

Connection methods

For connection, special connectors (fittings) are used.

Fittings for these pipes are of two types:

• compression threaded fittings;
• press fittings.

Benefits of using fittings

• quick and easy installation;
• no welding required;
• the labor intensity of the process of installing plumbing and heating systems is reduced;
• no special skills are required to perform the work;
• A very simple way to connect metal-plastic pipes with other types of pipes (steel, copper, plastic).

Compression Threaded Fittings

Compression fittings with threads for metal-plastic pipes are the most expensive. They allow you to make dismountable connections.

A wide range of dismountable compression fittings of various types is produced.

Types of threaded compression fittings:

• corners: nut-collet, collet-collet, collet-fitting;
• adapters: fitting-collet, nut-collet, collet-collet;
• crosses;
• tees: three collets; fitting-two collets;
• water sockets: two collet nuts and a collet nut.

• No special tools are required to install compression fittings. They are threaded and for their installation it is enough to have open-end or adjustable wrenches on hand;
• Compression (crimp) fittings for metal-plastic pipes are recommended for connecting pipes of cold water supply systems.

Compression fitting for metal-plastic pipes consists of:

• fitting;
• compression ring;
• union nut.

Photo: compression type connection

Press fittings

Press fittings are found during installation wide application when working on the installation of hot and cold water supply systems, when installing heating systems, heated floors.

Photo: press fitting diagram

This is due to the fact that press fittings have the following advantages over compression fittings:

• hidden laying of pipelines is allowed;
• Pouring with concrete is allowed;
• the connections are permanent. There is no need for annual preventive tightening of nuts at pipe joints;
• maximum permissible operating pressure at joints up to 10 atm:
• The service life of a connection using a press fitting is up to 50 years.

Their use is limited only by the need to use special presses (manual or automatic) during installation, which are not cheap.

A wide range of press fittings are available, allowing you to assemble a pipeline of any required configuration:

Photo: press fittings

• tee fitting;
• square;
• coupling;
• water socket;
• cross.

Advantages

• light weight;
• durability (service life up to 50 years);
• high throughput (one third higher than the throughput of similar metal pipes);
• economical and simple installation;
• resistance to aggressive environments;
• resistance to clogging;
• low thermal conductivity;
• high plasticity;
• high maintainability and ease of repair;
• are not able to conduct stray currents (antistatic);
• aesthetic appearance.

In order for the bathroom to have a neat appearance, you need to install a screen under the bathtub with your own hands, for example, from plastic panels. Read about this in the article:.

Find out in more detail about installing a sewer system in a private house with your own hands.

Flaws:

• are afraid of ultraviolet radiation;
• mechanical strength and thermal resistance below the corresponding parameters of copper and steel pipes;
• cannot be used as grounding conductors;
• accumulate electrostatic charges;
• require periodic maintenance (when using compression fittings);
• When using compression connectors, it is unacceptable to place them in concrete screed, it is necessary to provide access to the connectors for their periodic tightening;

Compression fitting installation

Required tool:

• adjustable or open-end wrenches;

Photo: adjustable wrenches
Photo6 scissors for cutting metal-plastic pipes
Photo: pipe calibrator

Installation of compression fittings on metal-plastic pipes is carried out in the following order:

• the pipe is straightened in a section of 10 cm on both sides from the cutting site;
• the location of the cut is outlined;
• at the intended location the pipe is cut at a right angle;

Photo: cutting a metal-plastic pipe

• the cut end is sanded with sandpaper and given the correct round shape using a special scan (calibration);
• a fitting and a cut compression ring are put on the pipe;

Photo: installation

• the fitting is wetted in water and put on the pipe so that the end of the pipe evenly touches the fitting;
• The nut is tightened by hand until it stops in the fitting. It should spin easily. If the nut is tight, then it is not on the thread. You need to try to unscrew and re-tighten the nut;
• Take 2 adjustable or open-end wrenches. One holds the nut body, the other tightens the nut 2-3 turns;
• check the assembled system for leaks.

Photo: checking for leaks

Important! Do not use excessive force when tightening the fitting. If a leak appears at the connection point, you need to carefully tighten the fitting nut.

Video: installation using threaded (collet) fittings

Installation of a press fitting on a metal-plastic pipe

Necessary toolfor installation of press fitting:

• automatic or manual press jaws;

Photo: press jaws

• scissors for cutting metal-plastic pipes or a hacksaw;

Photo: fine sanding paper

• special development and calibration to give the pipe the correct rounded shape.

Installation of a press fitting on a pipe:

• the pipe is straightened within the cut area;
• the location of the incision is outlined;
• the pipe is cut with scissors or sawn with a hacksaw at a right angle;

Photo: cropping

• With inside The end of the cut pipe is chamfered and burred using a reamer and sandpaper;

Photo: cleaning

• using a special calibration tool, the ovality of the pipe that occurs during its cutting is eliminated;

Photo: calibration

• a special crimp coupling is put on the pipe;
• a special insulating gasket is placed on the fitting fitting to protect against electrical corrosion;

Photo: installation of a press fitting

• the fitting fitting is carefully inserted into the pipe and crimped with press pliers;

Photo: crimping

• when crimped correctly coupling two uniform rings should appear on the fitting;
• For some manufacturers, the coupling of the press fitting is initially permanently fixed to the fitting, so after preparing the pipe at the connection point, the pipe is immediately seated on the fitting.

The correct fit of the pipe on the fitting is controlled through the hole in the coupling and the coupling is crimped.

Important! It is allowed to crimp the connection only once using press pliers. Repeated crimping is strictly prohibited!

Video: installation using press fittings

Installation rules

When performing installation work, it is important to observe the following rules:

• It is recommended to store pipes before installation in indoors, no closer than 1 meter to heating devices. Storage under a canopy is acceptable;
• carry out installation work at a temperature not lower than +10ºС;
• do not unload rolls of pipes by dropping them from a height;
• if metal-plastic pipes were transported at low temperatures, they must be kept indoors for 24 hours;
• open laying of metal-plastic pipes is permissible in places protected from mechanical and thermal influences, and exposure to ultraviolet radiation;
• Before pipe laying work begins, all fire and welding work must be completed;
• When laying open metal-plastic pipes, their laying is allowed only after all finishing works in room;
• When marking, it is unacceptable to use sharp objects;
• It is unacceptable to twist the pipes during installation or allow excessive bending;
• pipe bending can be done manually;

In this case, the bending radius should not exceed 5 pipe diameters. If you need a larger bend, you must use a special tool for bending metal-plastic pipes.

• Metal-plastic pipes are very flexible, so they must be secured. When laying open metal-plastic pipes, special fastening clips are used. At horizontal wiring pipes are fixed every 0.5 meters, and if vertical - every 1 meter;
• all pipeline fittings must be secured in such a way as to avoid transfer of load to the pipes;
• If it is necessary to pass a pipe through a wall or other structure, it is necessary to use special sleeves.

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Application

The scope of application is very wide:

• hot and cold water supply systems;
• floor and wall installation without radiator heating(“warm floors” and “warm walls”);
• radiator heating systems, with a circulating coolant temperature not exceeding 95 degrees;
• irrigation systems;
• heating systems for outdoor areas;
• soil heating systems in greenhouses, greenhouses, greenhouses;
• piping of thermal curtains and water heaters at a circulating coolant temperature of no higher than 95 degrees;
• installation of fuel lines and pipelines industrial purposes for transportation of non-food and food liquids;

Installation of water supply

Metal-plastic pipes are an excellent option for installing a hot and cold system or in an apartment.

When choosing pipes for installing water supply systems, it is necessary to take into account the operating pressure of the system and temperature (when installing hot water supply systems).

Installation of a water supply system from metal-plastic pipes is carried out in the following order:

• is being developed circuit diagram plumbing, on the basis of which an installation diagram is drawn with the distribution of pipes in the room. It is recommended to design a water supply system with a minimum number of connectors;

Photo: installation of water supply from metal-plastic pipes

• By wiring diagram the required length of water pipes and the required number of fittings of various types are determined;
• The installation diagram shows where the pipes will be secured. The required number of fasteners is calculated. Special clips (plastic locks) are used for fastening;
• determined by the type of fittings. If you plan to assemble the water supply system with your own hands and there is no opportunity to buy or rent press pliers for installing press fittings, then choose a compression fitting, for installation of which it is enough to have a pair of wrenches of the required size on hand;

Fittings are the weakest link in the plumbing system, so you should not skimp on fittings and buy the cheapest models.

• The pipeline is installed according to the diagram (fastening clips are installed in the designated places, pipes are separated, fittings are mounted);
• During the installation process, metal-plastic pipes are bent. Bending of metal-plastic pipes is done manually or using a special spring, which is inserted inside the pipe;

Photo: bending of metal-plastic pipes

Important! During the bending process, it is necessary to observe the maximum permissible bending radii of metal-plastic pipes, exceeding which can lead to damage to the integrity of the pipe.

• After installation is completed, the system is tested for leaks, and any leaks identified are eliminated.

Installation of heating pipes

Today, metal-plastic pipes are increasingly used in the installation of various heating systems.

Installation hidden systems heating is carried out using exclusively press fittings.

During installation open systems For heating, it is permissible to use threaded connectors.

Photo: installation of metal-plastic pipes for heating

When installing heating systems, the following recommendations must be taken into account:

• Heating pipes must be fastened in increments of no more than 0.5 m. When larger step it is possible that the pipes may sag between the fasteners, which may impair the circulation of the coolant in the system;
• pipes must be designed for a temperature of 95º C and a working pressure of 6.6 atmospheres;
• When choosing pipes, you must pay attention to the availability of quality certificates.

Installation of heated floors

Metal-plastic pipes today are the most affordable and economical option installation of underfloor heating systems. They bend easily, hold their shape well, are easy to install and operate, and last a long time.

Photo: heated floor diagram

The installation of a heated floor system is carried out using press fittings, so to perform pressure testing of the system you need to find press pliers or invite specialists.

When installing a heated floor system, pipes are laid in a snake, meander or spiral. The total length of one loop should not exceed 100 meters.

Photo: laying heated floor pipes with a spiral and snake
Photo: spiral snake

If the length is long, there will be ineffective heat transfer. When laying loops, ensure the distance between them.

Pipe consumption rate for installing heated floors: 7 linear meters per square meter premises.

Today for fulfillment plumbing system Metal pipes, which have become obsolete, are no longer used. Now the water supply is made of metal-plastic pipes.

This article is intended for those who are planning to repair their water supply in the near future. First you need to determine what types of metal-plastic pipes exist.

What is a metal-plastic pipe?

A metal-plastic pipe consists of three layers of materials. The outer layers are made of plastic. In the middle there is an aluminum layer, which is protected by plastic from moisture, corrosion and aggressive environments.

There are some types of metal-plastic pipes:

• By wall thickness and diameter;
• By manufacturer;
• Fitting if possible.

Metal-plastic pipes come in diameters from 16 to 32 millimeters. Some pipes can only be connected from the manufacturer of the same name, but there are times when you can also connect different pipes.

Helpful information ! The best popular metal-plastic pipes are produced in Germany, Belgium and Italy. When buying a fitting, you should not save money. This main part allows for a high-quality connection.

Metal-plastic pipes are easy to install. They are used everywhere. Pipes bend easily. They are not subject to corrosion and are not expensive. The price allows you to buy just such pipes. Maintenance is not difficult.

The disadvantage of metal-plastic pipes can be considered their short service life, which is about 15 years. When it's cold, pipes can quickly freeze and burst. Often you have to tighten the connections to prevent water from leaking out.

Methods for connecting metal-plastic pipes

There are two: compression fitting and press fitting. Experts divide the latter method into two more methods: using special couplings or using push-in fittings.

Tool for the job

In order to connect pipes with a press fitting, you will need a special tool for installing metal-plastic pipes. In particular, press pliers will be needed.

Pincers can be mechanical or hydraulic. When using one or another type of press fitting, certain tools are used. They are distinguished by design and methods of working with them. To carry out other work when installing metal-plastic pipes, no special tools are required. Usually they use those that are already in the arsenal of each owner.

In general, for work you will need an ordinary tape measure for measurements, a hacksaw (scissors) for metal to cut the pipe. You definitely need a calibrator, an expander (for a push-on fitting), as well as a press for the fitting and a regular wrench appropriate size.

Installation

If someone does not know how to install metal-plastic pipes, then there is no problem. On the Internet, you need to enter a request for installation of metal-plastic pipes in a search engine, watch a video tutorial and everything will immediately become clear.

Before you begin installing pipes, you must complete a diagram of the entire system, and also mark the location of the plumbing on it, heating devices. Take a pipe of the required diameter and size. It is cut off and the edges are aligned by a calibrator. The end must be cleaned so that there are no burrs or irregularities left on it. Such work is performed with a simple round file. You can use a metal drill.

The compression fitting unscrews. Remove the clamp and clamping nut. They are put on the pipe. The pipe is inserted into the fitting, aligned perfectly and the clamp and nut fall into place. The nut needs to be tightened. A wrench is used. The main thing is not to over-tighten. If you use excessive force, you can overtighten and break the thread. You need to tighten it until you hear a slight cracking noise. Then you can consider the connection ready.

Important! In this way, you can install those pipes that will be outside. If you need to embed pipes into the wall, then this connection method will not work.

When installing heating pipes that will be mounted into the wall, a press fitting is used. It can be done like this. The measured pipe is calibrated. The edges are processed as before.

The characteristic rings will be visible on the coupling. You can only crimp once. If you are not sure that everything will work out the first time, then it is better to watch a video on the Internet or contact a specialist.

To make a connection to a slip-on fitting, you must following works.

• The pipe is measured and cut.
• The coupling is put in place, the edges of the pipe are cleaned.
• The pipe must be placed on the fitting fitting.
• The sleeve is clamped manually or mechanically. A press is used for this.
• Then the pipe is pressed onto the fitting.

It's worth noting again that everyone can learn lessons on connecting metal-plastic water pipes. To do this, just read some materials on the Internet. You need to take video lessons as a basis.

Work plan

All work begins with the most important thing. This is the installation of pipes into the apartment or house itself. Most old houses have risers that are made from old metal pipes. Even this is not a problem.

Today you can buy a special adapter that can help connect metal and metal-plastic pipes.

On iron pipe threading needs to be done. Then a regular fitting is screwed onto it. As a rule, a filter and a water meter are installed near such connections. A tap is installed next to it, which will allow you to turn off the water in case of an emergency.

Helpful information! Typically, several connection schemes are used. All pipes can be connected in series. A manifold connection is often used. That is, each consumer has his own supply.

If you compare both methods, then you should pay attention to the second. It is quite practical, profitable and economical. And its installation is easier. Although opinions often differ.

The opinions are the same regarding the installation of ball valves, which are used on metal-plastic system. Use a separate tap for each consumer in the system. If, for example, a washbasin leaks, there will be no need to shut off the entire water supply to the apartment.

Installation of metal-plastic pipes involves some nuances. So, for example, to connect pipes at an angle of 90 degrees, you must use an elbow fitting.

Metal-plastic pipes are flexible and elastic. In order to bend the pipe, you must use a special spring. This is the only way to prevent kinking of the pipe. To strengthen the pipes on the walls, special clips are used, which are selected according to required diameter pipes.

Helpful information! To secure the clip to the wall, use self-tapping screws. The pipes are inserted into the clips easily. For smooth installation of pipes, markings are used on the wall, on the basis of which the clips will be installed.

In order to once again be safe from a possible flood due to a water leak, you need to carefully study all the rules for installing pipes. When working, it is important to pay great attention to every detail.

Pipe repair

To repair a leaking pipe, you need to identify the area where water is leaking, shut off part of the water supply, dry the area and repair it. First you need to clean the pipe from foreign contaminants in the form of dust and grease.

In order to carry out temporary pipe repairs, you can use rubber gasket and a clamp. You can also use a store-bought flange. Another temporary “treatment” for a pipe is sealant. However, it will not hold back the leak for long.

You can also use epoxy glue. The pipe is smeared with it and then wrapped with a bandage or cloth. Another layer of glue is applied on top of the fabric and the pipe must dry. The surface should dry for about 12 hours. Only then can you turn on the water.

Worth noting that no matter what method of temporarily eliminating a water leak is used, sooner or later the pipe will have to be replaced. You just need to go to the store, buy the required piece of pipe, as well as a fitting for it. Replace the leaking section of the water supply and forget about the problem. Sometimes it is enough to install a regular connection fitting.

Actually, that's all. Installing pipes, as you can see, is not a difficult matter. The main thing is to be attentive to all the details when connecting, and it all depends on the types of pipes.

It is worth carefully reviewing the material for defects, since you can subsequently flood not only your own home, but also your neighbor’s. You should not skimp on materials when installing metal-plastic pipes. The system already does not have a very long service life compared to old metal pipes.

Installing metal-plastic pipes for water supply with your own hands is quite simple if you understand the diagram, the necessary materials and tools, and the features of the technological process.

Advantages of metal-plastic pipelines:

• High performance characteristics– resistance to high temperatures, plasticity, absence of corrosion and salt deposits on the internal walls.
• Reliable connection of structures.
• Long service life - at least 10 years.
• No vibrations or increased noise.
• High-quality pipes do not support combustion.
• To install a plumbing system, minimal repair skills are required.
• Resistance to temperature fluctuations.

Flaws:

• With frequent overheating, the elasticity of pipes decreases.
• The need to protect pipes from direct sunlight.
• Plastic has a high expansion coefficient.

Fitting

Fittings for crimping

Pipeline elements intended for:

• connections of individual pipes of both the same and different diameters;
• creating branches from main pipelines and turns;
• connecting plumbing equipment.

O-rings are put on the fittings, which are necessary to increase the tightness of the connection and prevent leaks.

Crimp fittings

Required materials and tools

Pipe cutter The tool necessary for high-quality pipe cutting.

Calibrator. Device used for leveling internal surfaces pipes The standard model has 3 diameters - 16, 20 and 26 mm.

After processing the edges with a calibrator, the pipes are sealed onto the fittings.

Countersink. If there is no special knife on the calibrator, pipe countersinks are used, which also allow you to cut chamfers on the edges of the pipe.

Adjustable wrenches. Used to tighten nuts on fittings.

Manual or electric press. Used to compress pipes on crimp fittings.

Attention! Tools can be rented at the construction market.

Installation

Drawing up a pipeline diagram with all control points, fittings and shut-off valves. To simplify installation work, the pipeline route can also be drawn on the walls in actual dimensions.

It is necessary to decide on the method of connecting the pipes.

Crimping method

After cutting onto the calibrated pipes, put on the nut and ring and insert into the fitting until it stops. Then use an adjustable wrench to hold the fitting tightly, and with the other, tighten the nut on the pipe until it stops.

For better fit, you cannot use lubricants and petroleum products, because they will not ensure a tight connection.

Advantages:

• completely removable connection;
• ease of installation;
• absence of leaks in cold water supply networks over a long period of operation;
• long service life;
• the ability to quickly replace individual sections of the pipeline.

Crimping

The pipes are cut to the required length using a pipe cutter. Then they are calibrated and chamfers are cut at the edges.

Next, the edge of the pipe must be inserted all the way into the press fitting (there is a special hole to control the length). The pipe placed on the fitting is inserted into a press (electric and manual) and clamped until a tight connection is formed.

The crimping process takes no more than 60 seconds. Plastic clips can be removed (to give the structure a finished look).

Advantages:

• no need for maintenance;
• at correct installation no leaks throughout the entire life of the system;
• Possibility of sewing into walls and under drywall;
• low cost of installation work.

After installing the system, you need to check its functionality - fill the system with water. If there are no leaks, the installation can be considered successful.

If cracks occur in the fitting, it must be replaced. In order to tighten a loose fitting connection, you need 2 adjustable wrenches, one of which holds the fitting, and the other tightens the nut until it stops.

• When small leaks appear, it is necessary to promptly tighten the nuts on the fittings. If a leak reappears, it is necessary to inspect and replace the damaged area.
• It is necessary to install coarse (mechanical mesh) and fine filters in the system.
• Pipe benders, presses and other tools can be rented from a hardware store or online store, saving up to 30% of the total budget for water supply installation.
• It is not advisable to use fittings twice due to their low cost and worn out rubber bands. Finding identical gaskets is difficult.
• The crimp connection requires inspection and maintenance at least once a year for cold water pipes.
• Because main clamp polyethylene pipe in the fitting, it occurs at the fitting; after several tightenings, after the leak reoccurs, the entire assembly must be replaced with re-tightening in a new place. Replacement sealing gum(gaskets) in such cases will not have a positive effect.
• There is no need to wet the edges of the pipe when using a calibrator or countersink, because they have sharp enough knives for high-quality bevel cutting.
• It is not recommended to embed connection points (fittings) into walls. After 5-7 years, press fittings may also leak. Free access must be provided.
• Installation work should be carried out carefully; opening the bays is prohibited with a sharp knife.
• The length of the pipeline also includes sections that extend into the fitting; the margin is up to 2%. If the work is being carried out for the first time, it is necessary to take into account the rejected areas in the material consumption.
• For pipes of small diameters (16, 20 mm), it is advisable to use a pipe bender. Application allows you to save money on the purchase of corner fittings. This technique also eliminates leakage in these areas.
• Nessesary to use sufficient quantity clips for securing pipes to walls. Fastening is done every 70 cm. Clips must be purchased for the selected pipe diameter, because Technically, the pipeline is supposed to be snapped into the bend of the fastening structure.

Errors during system installation

• Leaks can be caused by unevenly cut pipe edges, so you should always use a pipe cutter for cutting.
• It is not recommended to replace crimp sleeves on fittings for crimp connections, because in this case, the fitting itself deteriorates, rapid depressurization occurs, and the service life of the system is reduced.
• Cheap connecting parts from unknown manufacturers are usually of low quality; replacing them several times is much more expensive than purchasing high-quality fittings.
• Poorly tightened pipes quickly leak.
• A system with crimp connections cannot be sewn into a wall, because this type connections required regular maintenance and tightening the nuts.
• If the pipe does not fit completely into the sleeve, there is a possibility of the pipe being torn out of the connection.
• You cannot use a hacksaw to cut pipes, because in this case, irregularities and burrs occur, and the pipe may crack. Knives and other objects should also not be used to cut chamfers; in this case, the pipe hole will be deformed. Which can lead to rapid leakage. For cutting it is necessary to use countersinks and calibrators.

How to choose pipes

To select pipes you need:

• decide on the type of water supply system;
• take into account the temperature maximum of the water that will flow (for hot water supply it is necessary to choose reinforced models);
• compare price and quality of products;
• operating conditions of the pipes and the expected period of use until the next repair.

How to determine the quality of metal-plastic pipes when purchasing

• Visually, the pipes should have no defects - seams, cracks, irregularities. Also, no delaminations should be visible on the pipe cut.
• Aluminum layer in quality products does not exceed 0.6 mm, but not less than 0.3 mm.

conclusions

Correct selection of pipes and working tools is a guarantee high-quality installation DIY plumbing.

Compliance with technology allows us to obtain reliable pipeline connections that can last for several decades.