How to install metal-plastic pipes. How to install metal-plastic pipes with your own hands: instructions, rules. Rules for the installation of structures made of metal polymers

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, now more and more drains are carried out by plastic pipelines. Mounting metal plastic pipes easily made by hand without the involvement of specialists.

Benefits of using plastic

Metal communications were the most popular a few years ago. They have high rates 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 effluents.

Photo - plastic sewer wiring

Advantages of metal-plastic pipes:

Excellent durability performance. They do not rust and salts do not accumulate on their inner walls. In addition, they also facilitate the removal of solid waste;
Frost resistance. Unlike conventional plastic analogues, such pipes do not crack due to temperature changes or when water freezes in them. Also, they do not deform;
Ease of installation. The installation technology of sewer plastic pipes does not require the use of complex devices, for example, heavy welding inverter, they can be cut directly into the right place on the highway using a simple fitting or adapter;
Availability. At the moment, the price of such communications is much lower than stainless steel. Sale is 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 neat work with them. They are a ply 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 sharp shocks or falls, so certain rules must be observed during installation.

In such communications there is a hidden gasket, which increases the tightness of the system. If during installation its integrity is violated, then the sewage system will begin to let air through, which will reduce its efficiency. You also need to comply with certain standards specified for the installation of any type of pipes in GOST R 50838.

Video: connecting plastic pipes

Mounting with fittings

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

Photo - design of splitters

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

It is necessary to cut the metal-plastic communication into segments. Please note that special pliers must be used to cut plastic, polypropylene and rubber bends. They will help you get the job done as smoothly and quickly as possible. Of course, you can use other possible options, but this may damage the inner layer;
Next, you need to prepare tees or corners for water supply. Seals are put on them, they are often made of rubber, but there are also plastic models. These rings will help protect the sewer from leaking;
For further installation work, you will need special devices - calibrators. They will help to fold the pipe opening in order to install the fittings, but do not bend the seal rings;
Experienced plumbers advise checking the pipe walls before starting installation. They must be completely smooth and clean, there can be no burrs or other irregularities on the cuts. If they are, carefully remove them with sandpaper and wipe the cut with an alcohol solution that will degrease the surface;
After the fitting is installed in the pipe. On it you need to put on a nut and a clamping collar of a suitable diameter. To do this, stretch the pipe a little with the help of a calibrator and put it on the end of the “leg” of the assembly, move it inward and fix it at the required depth;
Make sure that the joint is completely flat. After installation is complete, be sure to check its location in the pipe;
It remains only to tighten the nut on polymer or metal-plastic pipes.

Expert advice: Do not overtighten the nut. Because of this, cracks in communications often occur. Installation requirements state that you need to tighten it quite tightly, but do not pinch it. As soon as the nut starts to crackle, it means that it has already “sat” quite tightly on the metal-plastic.

Photo - types of nodes

Features of installing press fittings

In an apartment or house, metal-plastic pipes are often installed using press fittings. Compared to conventional ones, they have a number of advantages. They are ideal for providing wiring and installation of a heating system, underfloor heating, a heated towel rail and even gas pipelines. Their main advantage is that they do not need periodic repairs, unlike screw counterparts.

Photo - press node

Installation Tips for Press Fittings:

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

You can buy such fasteners in 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 mount it again.

So you can connect the pipe with an electric boiler or other heating home appliances. If it is necessary to bend the pipe when installing the press fitting, then the use of springs will be required. There is different ways, the simplest is to put a rigid spring on the communication and bend it in the right direction.

Photo - sewer wiring diagram

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

If for some reason you cannot carry out the installation of metal-plastic pipes with your own hands, then you can contact the specialists, the price for sewer wiring depends on the complexity of the work.

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

They are strong, durable, easy to install, resistant to aggressive environments and are often used in the construction of water pipes, underfloor heating, transportation systems. compressed air and various liquids (including chemically aggressive), 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 is a reinforcing aluminum shell;
aluminum and polyethylene layers are fastened together with adhesive layers.

Photo: structure of a metal-plastic pipe

This design provides unique properties of metal-plastic pipes:

pipes made of metal-plastic are easily bent, cut and keep the given shape, thanks to the aluminum core;
the outer and outer layers of polyethylene have a high corrosion resistance 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 are produced with a diameter of 16 to 53 mm. Pipes with a diameter of more than 40 mm are practically not used in housing construction, pipes with a diameter of 40 and 32 mm are actively used in wiring water supply network in a private house. The most popular and cheapest pipes are 16 mm, fittings for them are much cheaper than the rest. However, they and 20 mm pipes should only be used in central water supply networks at normal pressure in the water supply network;

Photo: pipe diameters and a table of pipe diameters for heating

pipe wall thickness(can be 2 or 3.5 mm);
allowable 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 use special connectors (fittings).

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 pipes of other types (steel, copper, plastic).

Compression threaded fittings

Threaded compression fittings for metal-plastic pipes are the most expensive. They allow you to make collapsible connections.

Issued a large assortment collapsible compression fittings of various types.

Varieties of threaded compression fittings:

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

Compression fittings require no special tools to install. 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 to be used 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 during installation are widely used when working on the installation of hot and cold water supply systems, during the installation of heating systems, underfloor heating.

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 concrete is allowed;
connections are unbreakable. There is no need for annual preventive tightening of nuts at pipe joints;
maximum allowable operating pressure at joints up to 10 atm:
the service life of the 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 is available, allowing you to assemble a pipeline of any required configuration:

Photo: press fittings

tee fitting;
square;
coupling;
water outlet;
cross.

Advantages

light weight;
durability (service life up to 50 years);
high throughput (one third more than throughput similar metal pipes);
economical and easy installation;
resistance to aggressive environments;
clogging resistance;
low thermal conductivity;
high plasticity;
high maintainability and ease of repair;
not capable of conducting stray currents (antistatic);
aesthetic appearance.

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Learn more about the sewerage device in a private house with your own hands.

Disadvantages:

afraid of ultraviolet radiation;
mechanical strength and thermal resistance is lower than 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 lay them in concrete screed, it is necessary to provide for the possibility of access to the connectors for their periodic tightening;

Mounting the compression fitting

Required tool:

adjustable wrenches or open-end wrenches;

Photo: adjustable wrenches

Photo6 scissors for cutting 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 of the cutting point;
the place of the cut is planned;
in the intended place, the pipe is cut at a right angle;

Photo: cutting a metal-plastic pipe

cut end is polished sandpaper and it is given the correct rounded shape with the help of 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 pipe with its end 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;
2 adjustable or open-end wrenches are taken. One holds the body of the nut, the other tightens the nut by 2-3 turns;
check the assembled system for leaks.

Photo: leak check

Important! Do not apply excessive force when tightening the fitting. If a leak occurs at the junction, you need to carefully tighten the fitting nut.

Video: installation with threaded (collet) fittings

Installation of a press fitting on a metal-plastic pipe

Required toolfor mounting a press fitting:

automatic or manual pressing tongs;

Photo: pressing tongs

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

Photo: fine sanding paper

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

Mounting a press fitting on a pipe:

the pipe is straightened within the incision site;
the place 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 with a reamer and sandpaper;

Photo: cleaning

using a special calibration tool, the ovality of the pipe that occurs when it is cut is eliminated;

Photo: calibration

a special crimp sleeve is put on the pipe;
a special insulating gasket is put 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 tongs;

Photo: crimping

with proper crimping coupling fitting should appear two uniform rings;
for some manufacturers, the press fitting coupling is initially permanently fixed to the fitting, therefore, after preparing the pipe at the junction, the pipe is immediately placed 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 only allowed to crimp the connection once with pressing tongs. Repeated crimping is strictly prohibited!

Video: installation with press fittings

Installation rules

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

it is recommended to store pipes before installation indoors, no closer than 1 meter to heating appliances. Permissible storage under a canopy;
conduct installation work at a temperature not lower than +10ºС;
do not unload rolls with pipes by dropping them from a height;
if metal-plastic pipes were transported at a low temperature, it is necessary to keep them indoors for a day;
open laying of metal-plastic pipes is permissible in places protected from mechanical and thermal influences, and exposure to ultraviolet radiation;
all fire and welding work must be completed before the start of pipe-laying work;
with open laying of metal-plastic pipes, their laying is allowed only upon completion of 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 a greater bend is needed, a special tool for bending metal-plastic pipes must be used.

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

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Application

The scope of application is very wide:

hot and cold water supply systems;
installation of floor and wall non-radiator heating (“warm floors” and “warm walls”);
radiator heating systems, at a temperature of the circulating coolant not higher than 95 degrees;
irrigation systems;
open area heating systems;
soil heating systems in greenhouses, greenhouses, greenhouses;
binding of thermal curtains and water heaters at a temperature of the circulating coolant not higher than 95 degrees;
arrangement of fuel lines and pipelines industrial use for transportation of non-food and food liquids;

Plumbing installation

Metal-plastic pipes great option for the device of the hot and cold system or in the apartment.

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

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

being developed circuit diagram plumbing, on the basis of which a wiring diagram is drawn with piping in the room. It is recommended to design plumbing with a minimum number of connectors;

Photo: installation of a water supply system from metal-plastic pipes

on wiring diagram find out the required length water pipes, the required number of fittings of various types;
on the wiring diagram, the places for fixing the pipes are outlined. The required number of fasteners is calculated. For fasteners, special clips (plastic locks) are used;
are determined with the type of fittings. If you plan to assemble the water supply with your own hands and there is no way to buy or rent press tongs for mounting press fittings, then we choose a compression fitting, for installation of which it is enough to have a pair of wrenches of the right size on hand;

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

the installation of the pipeline is carried out according to the scheme (fixing clips are installed in the designated places, pipes are bred, fittings are mounted);
during the installation process, metal-plastic pipes are bent. Bending of metal-plastic pipes is performed manually or with the help of 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, the excess of which is fraught with a violation of the integrity of the pipe.

after installation is completed, the system is tested for tightness, the detected leaks are eliminated.

Installation of pipes for heating

Metal-plastic pipes are increasingly used today for installation various systems heating.

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

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

Photo: installation of metal-plastic pipes for heating

When installing heating systems, the following recommendations should be considered:

fastening of heating pipes should be done in increments of no more than 0.5 m. With a larger step, pipes may sag between the fasteners, which is fraught with a violation of 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, it is imperative to pay attention to the availability of quality certificates.

Installation of a warm floor

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

Photo: underfloor heating scheme

Installation of the underfloor heating system is carried out using press fittings, therefore, to perform pressure testing of the system, it is necessary to find press tongs, or invite specialists.

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

Photo: laying underfloor heating pipes with a spiral and a snake

Photo: snake spiral

With a long length there will be inefficient heat transfer. When laying the loops, provide for the distance between them.

Pipe consumption rate for underfloor heating: 7 running meters on the square meter premises.

It is quite simple to carry out the installation of metal-plastic pipes with your own hands, and if you get used to it, you can also do it quickly. This will require a bit of ingenuity and minimum set tool, its composition depends on the type of connectors selected. How to choose the right fittings and install the plumbing or heating from metal-plastic will be described in this article.

Preparatory stage

Metal-plastic pipes are interconnected and connected to plumbing fixtures using adapters, tees, elbows and other elements - fittings. They are of two types:

collapsible (compression);
press.

The difference between them is in the cost and connection technology, which will be discussed below. At the stage of purchasing connecting elements, you need to take into account some points in order to make the right choice. If the system is small and is laid within the same room, then you can safely take collapsible fittings and get to work. When it is required to assemble a heating system in a two- or three-story building, then you will spend a lot of time connecting metal-plastic pipes with compression fittings, and it will come out more expensive in terms of money. It's easier to buy a set of press connectors, and then find crimping pliers for their installation, it will come out much faster and cheaper.

Advice. When connecting metal-polymer pipes to centralized heating or water supply systems, it is better to use press fittings, since pressure drops and water hammer are frequent in these networks.

The next step is to prepare the instrument. Regardless of the type of connection, you will need the following set:

cutting knife;
spring for pipe bending;
calibrator;
sandpaper.

To work with metal-plastic pipes, a special knife is available for sale, which allows you to cut clearly at an angle of 90º and leave a minimum of burrs. However, you can also use a simple sharp knife. The calibrator is a plastic or metal cross with ends different sizes for various diameters pipes. plastic tool and a bending spring costs a penny, although some craftsmen use different devices instead.

To work with press fittings, the installation tool must include a pressing tool. Their purchase makes sense when the amount of work is large enough, in other cases it is easier to take this tool from someone for a while. Collapsible connectors are twisted with open-end wrenches of the appropriate sizes. To attach the pipe to building structures, you must additionally prepare a drill and a small hammer. When all of the above is available, we proceed to assemble the system.

Work order

It is best to carry out the installation of a metal-plastic pipe while fixing it to the wall and sequential assembly connections. That is, a pipe section with a length from the first connection to the second is unwound from the bay, after which it is cut off and connected to the first and second fittings. In the process of laying, holes are alternately drilled in the wall, into which plastic holders for the pipe are installed using dowel-nails. Having attached the first section, proceed to the second and so on.

Do not forget that the pipes are installed with a slope in the required direction. You should not do the assembly in reverse, laying lines around the house, and then cutting tees and elbows into them. This is inconvenient and fraught with errors, since the pipe will have to be cut and processed in place.

Before laying, the metal-polymer pipe should be carefully aligned by hand, and a spring should be used to perform a smooth turn. It is laid inside at the bend, and then you can perform the operation with your hands, the spring will prevent the pipe from breaking. For connection to collapsible fittings, the following technology for mounting metal-plastic pipes is used:

a cut is made at an angle of 90º;
sandpaper gently cleans the end of the pipe inside and out;
the union nut of the fitting is put on the pipe;
the corresponding end of the calibrator expands the inner diameter of the pipe;
a compression ring is put on;
the pipe is inserted into the fitting until it stops, which will require a certain effort;
the nut is screwed onto the fitting and tightened with two open-end wrenches so that 1-1.5 turns of the thread remain in sight.

The video will help to study the operation in more detail:

Advice. Do not cut the pipe with a hacksaw, it leaves too many burrs on the polyethylene that will have to be cleaned, do this with a sharp knife. And in order for the heating pipe to fit better into the connector, it is recommended to moisten it with soapy water.

Installation of the press element is fast. There are no union nuts and ferrules; after cutting, process the pipe as described above and insert it into the fitting until it stops. Then you need to take the pliers, put them on the steel crimp sleeve and squeeze the handles to the end. When you feel that the pliers have closed, then the connection is ready. How to do it right is shown in the video:

Conclusion

Observing simple rules installation of metal-plastic pipes, you can independently lay both heating and water supply in your home. If you are doing this for the first time, take your time, and be especially careful when bending pipes. It is better to attach plastic clamps to the wall before, and not after, laying the pipe, it will be more convenient.

Do-it-yourself will be required when creating plumbing and heating 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 an aluminum layer is located between them. Adhesive layers are also provided at the points of contact with the layer.

Among the main advantages of this design:

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

Wiring diagrams

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

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

Important: Whichever system you choose, for each device that consumes water, you must install its own ball valve. This will cut off the water supply pointwise in the event of a breakdown.

The general connection scheme always starts with high-quality valves that can be operated with a working pressure of up to 60 atm and heating up to + 150 ° C. After them, a water meter, a device fine cleaning, pressure reducer, collector, and from it water supply pipes are already bred to each of installed appliances. Filters are needed to trap contaminants - sand, scale, and so on. As for collectors, thanks to them, a uniform supply of water to each of the consuming devices is ensured.

What tool is required

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

Pipe cutting shears must be of high quality so that the pipe does not deteriorate during cutting, so that there are no burrs and the upper protective polymer layer is not broken.
Calibrator - straightens the "consequences" of the cut, when the wall is slightly concave inward, allows you to expand the pipes.
Adjustable wrench and open end wrenches.
Pliers and drill, tape measure.
, if the assembly will use . They come with a mechanical or hydraulic drive (household and professional, respectively).
Expander, in case of using sliding fittings.

Tool for mounting metal-plastic pipes: 1 - scissors, 2 - press tongs, 3 - calibrator

How to connect metal-plastic pipelines

Do-it-yourself installation of metal-plastic pipes for water supply can be carried out compression or press fittings.

When the compression fittings are mounted, a nut is screwed onto the open ferrule. This creates pressure (two wrenches), due to which a strong compression connection is formed. In this case metal-plastic plumbing it is worth mounting in a single segment so that there are no “extra” connections. After all compression fittings will have to be tightened regularly to keep the connection tight.

Features of installation with press fittings

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

Important: Pipes mounted with press fittings can even be poured with concrete.

The connection technology does not provide for welding or soldering:

First, cut the pipe, strictly maintaining an angle of 90 degrees.
The edge of the pipe must be processed (chamfered). This ensures that the pipe is adjusted to the required diameter.
A stainless steel sleeve should be put on the edge of the pipe, and installed into the pipe until it stops shaped part fitting.
A press clamp must be applied to the sleeve, and the handles must be connected until it stops.

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

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 a standard way, after which the coupling is put on. The pre-cleaned edge should be processed with an expander and flared. Then the pipe is put on the fitting fitting, the sleeve is clamped in the press and moved. The sliding fitting works like this: when the coupling is pushed to the fitting, the pipe is pressed and securely fixed. This type connection is also one-piece.

We fasten the clips to the wall with screws. In order for the marking to be done smoothly, we first mark the places for the clips. 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 performed in the case when it is carried out partial replacement a water pipe or a metal-plastic pipe is connected to an old metal riser. A compression fitting and a calibrator are required for connection work.

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) - under the dimensions of the metal-plastic pipeline.

A tow is wound on a metal pipe, after which a fitting is wound. 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 provides a 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 needed at attachment points near geysers, washing machines.

General rules for laying a metal-plastic pipeline

Should be considered:

the sensitivity of the material to thermal, mechanical stress, as well as ultraviolet - in practice, this means that open wiring from such pipes can only be done in those places where the factors of such an impact are excluded;
if the wiring is hidden, then there must be hatches and removable shields for easy access to the connecting fittings (if the fittings are screw type);
if metal-plastic pipes are laid through building construction, then sleeves are also provided in them so that their inner diameter is over size metal-plastic pipes by 5-10 mm - then a gap is formed that needs to be filled with soft material;
cracks and scratches should not appear on the surface of the pipes during laying - this means that the marking should be done only with a soft pencil or marker.

How to repair

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

Repair can be performed using one of the following technologies:

Bandage as a temporary fix. You need to take a rubber pad, attach it to the place of leaks and fix it.
Temporary methods also include flange in which the rubber gasket is installed.
With sealant you can reliably cover up cracks and leaks, but this composition will also deteriorate over time.
Epoxy adhesive- they smear the area of the leak, then a layer of bandage or cotton fabric is made, after which - another layer of glue. The entire area should dry out for 11 hours, and then you can restore the water supply.

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

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

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

Metal-plastic pipes - do-it-yourself installation video

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

Metal-plastic pipes, due to their advantages over metal products, are widely used for the installation of pipelines in apartments and private (country) houses. How is the laying of metal-plastic pipes , as well as all their advantages and features are discussed in this article.

The design of metal-plastic products

Pipes made of metal-plastic are products consisting of five layers:

Inner polyethylene layer.
A layer of special adhesive composition.
Intermediate carrier aluminum layer.
The second layer of special adhesive composition.
Outer polyethylene layer.

Since the cost of the components included in the product is not high, the cost of metal-plastic pipes and fitting products is also not high.

Advantages of metal-plastic pipes

Metal-plastic products used for the installation of water pipes compare favorably with alternative products. First of all, it is advisable to replace pipes with metal-plastic ones due to their positive properties:

long service life, which is at least 50 years, provided that pipeline products are installed and operated in strict accordance with technical standards;
corrosion resistance;
lack of formation of saline and lime deposits on the inner surface pipes, which provides them with good throughput throughout long period operation;
absence of toxic components of metal-plastic;
the low weight of the products, due to which such pipes during installation do not create a load on the foundation or floor of the house;
delivery of products in coils allows minimizing product waste during pipeline laying;
easy laying of metal-plastic pipes without the use of welding and special tool;
a sufficiently high sound absorption effect, so it is possible to lay the pipeline without insulating material;
no need for painting and other maintenance products;
low coefficient of thermal conductivity;
high mechanical strength (up to 10 atmospheres);
sufficient plasticity of metal-plastic products: if water freezes in the pipe, it will simply expand, but not collapse;
good thermal stability when transporting a hot working medium;
the ability to mount pipes in a concrete screed due to the minimum linear stress.

Installation of a pipeline made of metal-plastic

Easy to work with products allows for savings financial resources organize the installation of the pipeline in the apartment or country house(dacha) independently. Do-it-yourself metal-plastic pipes are laid in the order described below.

Preparatory work

Before laying pipes, ball valves are installed on the hot or cold water. Further, after the taps, water purification filters, meters, a pressure reducer and a collector are mounted, which is responsible for the uniform distribution of water between sanitary appliances. From a collector for an apartment or house to sanitary appliances metal-plastic pipes are being laid . The positive aspect of the collector wiring is that the pipe is connected with one thread without unnecessary branches and connections to a specific sanitary appliance.

Pipe cutting

Products are supplied in coils, so pieces of pipes of the required length are cut off. This operation should be carried out using special cutting shears (pipe cutters). When using another tool, there is a high probability of damaging the protective layer of the pipe. In addition, the edge will turn out to be uneven, which will further affect the sealing of the joint. In the most extreme case, you can use a hacksaw with very fine blade teeth.

After cutting, it is necessary to remove the sharp edge of the pipe cut using improvised tools, such as a round file or knife, otherwise it may damage rubber seals when tightening the connection.

Product connection

It is possible to connect pipes made of metal-plastic thanks to the use of:

crimp (compression) screw fittings;
press fittings.

With the help of compression fittings, detachable connecting nodes are obtained. Sealing with the pipe in this case is provided by a sealing split ring, which is tightened clamping nut. Such a connection requires constant monitoring and periodic tightening.

For a monolithic (non-separable) connection, press fittings are used, the installation of which is carried out using a special tool. Since metal-plastic tubular products are laid mainly by a hidden method into the wall, it is necessary to ensure reliable tightness of the joints.

Consider how to install a reliable connecting node using the use of compression fittings:

First, a clamping nut is threaded onto the pipe, as well as a split sealing ring.
To seal the connection, additional rubber seals are mounted on the fitting fittings. O-rings. To prevent their damage, the pipe must first be expanded using a special calibrator.
The fitting nipple is inserted into the flared end of the pipe.
The next step is to assemble the fitting. The split ring is returned and the connector is hermetically tightened with a nut.

The nut must be tightened tightly with an appropriate wrench until it crackles, but with care, without applying excessive force. It is very important to pay attention and check the thread quality when buying fittings. It should not contain any burrs.

pipeline bend

If it is necessary to make a bend during the laying of the pipeline, a special spring or a flexible inner (outer) mandrel is used, which prevents the pipe from being squeezed, reducing the clearance or breaking the product during bending. The mandrel is selected with a diameter that matches the diameter of the pipe.

The metal-plastic product is bent with small uniform movements until the required configuration or bending angle is obtained. After the procedure is completed, the spring or mandrel is removed from the pipe.

Fastening

The fastening of metal-plastic pipes to the plane being laid can be ensured by using special clips. They are available in various sizes for use with piping products. different diameter. These fasteners provide axial movement of pipes during heating. To ensure the accuracy of laying the line, it is advisable to carry out appropriate markings before mounting the clips.

It can be used for the installation of pipeline products and special supports or suspensions. In case of application metal mount be sure to put gaskets from any soft material.

Rules for laying the highway

Metal-plastic products allow you to lay a pipeline in an apartment or dacha, both open and in a hidden way in the ground or wall.

When laying pipes, it must be remembered that for metal-plastic products it is necessary to exclude sudden pressure drops. Therefore, it is planned to install special gearboxes on the highway to equalize the pressure in the system.

Installation of metal-plastic pipes is carried out in compliance with the following rules:

The manufacturer recommends that the pipeline be installed using metal-plastic pipes at an ambient temperature of at least 10ºС.
If the pipes were transported (stored) at sub-zero temperature, then they must be allowed to warm up for some time before installation.
With an open laying method, for example in a bathroom, the installation of the pipeline is carried out after finishing wall (ceiling) work.
Fractures of pipeline products during installation are not allowed.
When laying pipes open way or in the ground, it is necessary to minimize the impact on them of direct ultraviolet radiation and strong mechanical impact.
In the case of hidden laying of products, it is necessary to provide inspection hatches along the entire length of the pipeline to provide access to fitting compression connections.
If it is necessary to lay a pipe through a wall or partition, use embedded sleeves 10.0 mm larger than the diameter of the product. Free space filled with non-combustible material. In any case, the possibility of axial free movement of the pipe must be ensured.

The formation of accidental scratches and cuts on metal-plastic products during installation is not permissible. For the same reason, when unpacking a coil with a metal-plastic pipe, you cannot use a sharp tool. And for marking the pipe it is necessary to use only a pencil (marker).

If you install and connect metal-plastic pipes according to the rules set out in the article, you can organize a water supply or heating system that meets all requirements. A pipeline laid independently will perform the functions assigned to it for a long time without accidents.

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