Installation of metal-plastic water pipes. Installation of metal-plastic pipes. How to bend a metal-plastic pipe correctly

In order to install a water supply system, it is not at all necessary to always resort to the expensive services of specialists. The article describes step by step the sequence of metal installation plastic pipes for DIY plumbing when renovating a bathroom. Using it, you will do similar work yourself.

Properties of metal-plastic pipes

Metal-plastic pipes are currently widely used for the installation of pipelines for heating and water supply systems. Compared to traditional steel, they have several valuable properties, due to which they are most often used:

metal-plastic pipes do not rust and deposits do not form on their inner surface;
have a long service life, manufacturers guarantee a service life of up to 50 years;
simple and technological installation does not require special qualifications from the performer;
relatively low price of materials and installation costs.

For installation of water supply major renovation the customer chose from several bathrooms alternative options metal-plastic pipes with connections using press fittings.

Preparation for installation

We come up with the configuration of the future water supply system. It was decided that the use of collectors was not practical. This makes the pipeline more expensive, but does not provide any operational advantages. Therefore, they decided to make pipeline branches to individual water collection points using tees.

After purchasing all necessary fittings, we laid them out on the floor in the order in which they will be connected in the pipeline. This “rehearsal” made it possible to make sure that all fittings were purchased correctly.

For installation of the water supply we have prepared the following tools and auxiliary materials:

Special scissors for cutting plastic and calibrator.
Press pliers for crimping connections.
Adjustable and gas wrenches.
Flax and sealing paste.

Before the installation of the pipeline in the bathroom began, the necessary preparatory work. All the old plumbing was dismantled along with the pipes, the walls were plastered with the preliminary installation of beacons. After the plaster had dried, sufficiently loose grooves for the pipes were cut into the wall.

Installation of water supply

Connecting pipes with press fittings involves two operations:

Use scissors to cut the pipe to the required length. Using a calibrator, we correct the shape of the cut and chamfer simultaneously from the outer and inner surfaces of the pipe.
Insert the pipe into the fitting sleeve until it stops. The end of the pipe should be visible through special inspection holes. Use pliers to crimp the fitting twice.

The photograph shows that as a result of crimping, two annular compressions are formed on the sleeve.

To simplify the work, we first assemble the individual parts of the water pipe. For example, we crimp water sockets for installing a mixer and attach them to a special mounting plate.

We install the prepared pieces of pipeline in their appropriate place and secure them. The mounting strips are attached to the wall using dowels and screws, the pipes are carefully bent and laid into the grooves.

We connect the assembled parts of the water supply system into a single whole on site. The crimping pliers device allows you to rotate the tool handles into a position convenient for work.

We continue to sequentially install all parts of the water supply system and connect it to the hot and cold water. To make it possible to replace water meters and taps in the future, we make the connection of the pipeline to the meters collapsible, using “American” ones.

For all work on installing the pipeline from metal-plastic pipes it took an hour and a half. Upon completion of installation, we put plugs on all water outlets, opened the taps on the risers and left the pipeline with water under pressure for several days. The grooves were not covered to check the connections for leaks. Work on finishing the bathroom continued at this time.

The installed water supply system turned out to be airtight: there were no leaks in any connection. You can fill the grooves with plaster and finish tiling the walls.

Helpful Tips:

The connection on press fittings is non-separable. If there is an error, it cannot be redone. It is useful to have a few spare fittings in case this happens.
You don’t have to buy press jaws; you can rent them.
Metal-plastic pipes must be bent with caution. If the pipe wall becomes damaged during bending, the pipe should be replaced.
To prevent the pipe from experiencing excessive stress under the plaster when heating and cooling from water, it is better not to smear it directly into the plaster: place an electric corrugation on the pipe. For a pipe with a diameter of 16 mm, a 25 mm corrugation is ideal.

We hope the article will be useful to you, and you will be able to install a pipeline from a metal-plastic pipe with a connection using press fittings yourself.

Previously, the pipeline was associated with heavy metal pipes, which only a master could handle. Now you can make a metal-plastic pipeline with your own hands, if you have the desire. Step by step description working with videos will help you understand the basic principles.

Metal-plastic pipes - a practical “sandwich”

Due to their design, metal-plastic pipes have a number of advantages over other pipeline materials. Their structure is as follows:

The inner layer consists of molecular polyethylene, cross-linked and compacted in a special way;
An adhesive layer that bonds the polyethylene layer to the aluminum layer;
Aluminum layer;
Adhesive layer connecting the aluminum layer and outer plastic;
The last outer layer of plastic.

As you can see, the structure of metal-plastic products is similar to a complex sandwich that combines everything strengths plastic and metal. The advantages of such pipes can be described as follows:

All these qualities are very rarely combined in one product, which is why metal-plastic as a material for pipelines is very popular.

Carefully! Unpack a coil of metal-plastic pipes without using sharp objects to avoid damaging their integrity.

Preparation of tools and components

As already mentioned, installation of a metal-plastic pipeline is possible with your own hands, you just need to know the basic principles.

Selection of components

The minimum required kit for completing a metal-plastic water supply system with your own hands is as follows:

ball valves;
metal-plastic pipes;
fitting.

Ball valves

It all starts with the installation of ball valves, the quality of which determines the safety of the entire pipeline. In the event of a leak, the ball valve shuts off the water supply from the common riser to the apartment.

Attention! Avoid Chinese faucets, recognizing them by their poor quality casting.

Choose those models of ball valves that are capable of operating in the conditions in which they will be used. It is best to take models that are designed for 60 atmospheres and 150 ºС.

Pipe marking

When choosing pipes, it is very important to take into account the markings, which indicate the conditions under which they can be used. It is advisable to choose products labeled PEX or PE-RT, which are designed for high blood pressure systems and can easily withstand water hammer. Products marked PE-RS, PE-HD or HDPE have more low price, but can only be used on systems with low pressure. We do not advise you to equip a pipeline using such material, since any water hammer can be destructive for them.

Fitting

Metal-plastic pipes are connected into a single system using fittings, which can be of three types:

Compression;
Press;
Sliding.

In practice, compression or crimp fittings are most often used, due to the fact that this requires only one wrench. This fitting can be used many times and consists of a nut, a fitting and a split ring.

Press fittings are more reliable, so they are used to equip a hot water supply system. But for installation in this way you need to have special press pliers.

Slip-on fittings will also require special equipment - an expander, which is capable of expanding the diameter for installation.

Tools for work

To complete all the work you will need A few simple tools:

Special scissors;
Pipe bender;
Calibrator;
Chamfer;
Pair wrenches.

A chamfer will be required to prepare the end of the pipe for installation. He removes a certain layer, creating a chamfer. Without this step it will be difficult to achieve a tight joint.

To be able to begin direct installation, you need to draw up detailed diagram pipeline. On it you need to mark all pipe sections and connecting points, as well as other key elements: filters, taps, tees, etc.

Plumbing diagram

To install a reliable water supply system made of metal-plastic, you need to know the installation sequence of certain components of this system.

Plumbing diagram:

Inlet ball valve;
A coarse filter that will stop large dirt particles;
Water meter;
Fine filter;
Pressure stabilizer, which equalizes the pressure during internal system during surges in the external water supply;
A collector that distributes water;
Direct routing of metal-plastic pipes to plumbing fixtures.

For metal-plastic pipes, a coarse filter is highly recommended, since large particles can damage the inner layer of polyethylene. As you know, there are plenty of such particles, for example, sand, metals or scale, in our risers.

The collector evenly distributes water from the riser to the points of consumption: sink, toilet, washing machine, etc. These devices have multiple outlets, so you need to choose the model that will fit your plumbing circuit.

Care must be taken first when working with metal-plastic, since careless handling or brute force can easily damage this material. Do not tighten the nuts too tightly or abruptly, and do not allow scratches and cuts to appear on the surface of the pipe. Before starting work, we recommend that you watch the installation video.

Installation with compression fittings

First of all, as already noted, we install a ball valve that allows you to shut off the water to your apartment or house.

Stages of DIY pipeline installation:

Wiring using metal-plastic pipes must be carried out as a solid line from the collector to the point of consumption. There is no need to introduce unnecessary connections, since compression fittings periodically need to be pulled in order to maintain the tightness of the structure.

If you are installing heated floors, then the presence of compression fittings under the floor is unacceptable, because their prevention will be unavailable. Fortunately, metal-plastic pipes bend, and they can be laid in any shape, avoiding unnecessary connecting nodes. In addition, there are press fittings that do not require broaching - they are strong and durable, they will provide quick installation and a performance guarantee of up to 50 years. The installation diagram using such fittings is described below.

Installation with press fittings

Press fittings can withstand a pressure of 10 bar in operating mode. However, to install them you will need at least a simple manual press machine, but there are also hydraulic ones.

Installation diagram with press fitting:

The first steps are completely the same as installing compression fittings: cut off the pipe, as well as calibrate and chamfer;
A stainless steel sleeve is placed on the end of the pipe;
Now you need to insert the fitting part into the pipe until it stops;
The sleeve must be clamped using a pressing machine;
The handle of the press is brought all the way.

Here are some useful tips that will help you avoid basic mistakes when working with metal-plastic pipes:

More tips on working with pipes can be seen in the video.

Do-it-yourself metal-plastic water pipe even a non-professional can do it, having carefully studied the master class on video. This does not require any special expensive devices or special skills. However, despite the strength and flexibility of metal-plastic, in order for these pipes to serve you as long as possible, you need to follow some rules when installing them. The videos and tips in our article will help you complete all the work on installing a metal-plastic water supply system.

The sewer system is one of the critical 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. Installation of metal-plastic pipes is easy to do 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 - metal-plastic sewerage installation

Advantages of metal-plastic pipes:

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;
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;
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;
Availability. On at the 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 shocks or falls, so certain rules must be followed during installation.

In such communications there is a hidden gasket that 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 a unit that is a connector of various sections of 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:

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;
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 leaks;
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;
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 alcohol solution which will degrease the surface;
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;
Make sure that the joint is completely level. After installation is complete, be sure to check its location in the pipe;
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 conventional ones, they have a number of 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:

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;
Now using gauges, you need to open the pipe to the diameter of the nodes and chamfer;
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;
Further installation is carried out using a special device. The press equipment clamps the sleeve and fitting, forming a “dead” mount, after which the manifold can be connected here. This ideal 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 reviews 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 systems. 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.

Today, do-it-yourself installation of metal-plastic pipes is successfully carried out in hot and cold water supply systems.

Due to their design, metal-plastic pipes have a number of advantages that distinguish such pipes compared to other types.

Design and advantages of metal-plastic pipes

Metal-plastic pipes consist of five layers:

the inner layer of the pipe is made of molecularly compacted or cross-linked polyethylene;
a layer of glue is applied to the polyethylene, which connects it to the aluminum layer;
aluminum layer;
another layer of glue that connects the aluminum to the outer layer of plastic;
layer of plastic.

Advantages of metal-plastic pipes:

the polymer layer gives the pipes high corrosion resistance;
the aluminum layer gives the metal-plastic pipes elasticity, while they adhere to the shape that the installer gives them;
do not require perfectly accurate calculation of linear dimensions.

Water supply wiring diagram

The installation of metal-plastic pipes of the water supply system in the apartment begins with the installation of ball valves on the riser.

Exceptionally high quality: having high working pressure(within 60 atmospheres) and operating temperature within 150 degrees.

Need to beware Chinese fakes, after all, much in plumbing system depends on the quality of the taps. In a situation where leaks occur, it is the ball valve that can be used to shut off the water supply to the apartment.

Next to the ball valve they install a deep filter paired with a water meter, then a fine filter, then a pressure reducer, as well as a manifold, from which it is made of metal-plastic to sanitary fixtures.

Installation of metal-plastic pipes is carried out together with filters in order to protect pipes and plumbing fixtures from small particles of sand, scale, metals, which large quantities present in risers.

The collector is installed for a uniform supply of water from the main pipe (riser) to the consuming elements - toilet, sink, washing machine etc. Collectors are usually equipped with 2, 3 or 4 outputs. If there are more than 4 consuming elements, collectors with the required number of outlets are selected.

Fittings for metal-plastic pipes

Metal-plastic pipes are connected using fittings. They are divided into compression or press fittings, and compression or screw fittings.

When using a compression fitting, connections are achieved by the pressure that occurs when the nut of the open ferrule is tightened.

No special tools are required to make the compression connection. Installation is carried out using a pair of wrenches (one tightens the nut, the other counteracts it).

Wiring through a metal-plastic pipe should be done in one whole “thread” from the collector to the consuming element without unnecessary connections. Over time, it may be necessary to tighten the compression fittings to maintain a tight connection.

However, if pipes with several fitting connections are covered with tiles or laid in the floor, then this operation will be very difficult to carry out.

If you do not know how to connect metal-plastic pipes in such a way as to protect yourself from periodic pulling of fittings, use press fittings.

In addition, such connecting elements are strong and durable (their warranty ranges from 50 years), can withstand operating pressures of up to 10 bar, and provide easy and quick installation.

Metal-plastic pipes are installed using press fittings using a press machine. Press machines can be either simple manual or microprocessor hydraulic.

The process of installing metal-plastic pipes using press fittings is carried out as follows.

Namely:

The pipe is cut at an angle of 90 degrees with special scissors.
Using a special calibration tool and a reamer, the chamfer is removed and the pipe diameter is adjusted for subsequent installation.
A stainless steel sleeve is placed on the end of the pipe.
Insert the fitting part into the pipe until it stops.
The sleeve is grasped with a clamp of a hydraulic or manual press.
The handles of the press are pressed all the way.

Rules for laying a pipeline made of metal-plastic pipes

Be careful when carrying out installation - metal-plastic pipes are very sensitive to thermal and mechanical damage, as well as exposure to ultraviolet radiation.

Open laying of such pipes should be allowed only in places where there are no influences of these factors.

When installing a hidden pipeline, removable panels and hatches must be provided for access to screw-type fittings. In addition, it is necessary that such elements do not have sharp protrusions.

Through building structures should be carried out using sleeves having an internal diameter 5-10 mm larger than the external diameter of the pipe itself. The resulting gap is sealed with fireproof soft material, which will allow longitudinal movement of the pipe.

At each stage of the installation of a metal-plastic pipeline, it is necessary to remember that the appearance of cuts or scratches on the surface of the pipes is unacceptable. Do not use sharp objects when unpacking a coil with a pipe. When making markings on the pipe, you need to use only a marker or pencil.

Do-it-yourself installation of metal-plastic pipes - a video about which can be found on the Internet - is carried out using hangers or supports, with the help of which they are attached to the wall and which are offered by pipe manufacturers.

Important! Metal fasteners must be equipped with gaskets made of soft material.

Video tutorial on installing metal-plastic pipes

It is also necessary to provide for the possibility of free movement of the fixed pipe in the axial direction. Fixed fastening of pipes by compression is prohibited.

The assembly of communications from metal-plastic is one of the most simple ways independently install plumbing, heating, and sewerage in the house. The work does not require expensive equipment, special skills, welding work. Installation of metal-plastic pipes is carried out using different types fittings, the choice of which depends on the purpose of the pipeline and the conditions of its installation.

Metal-polymer pipelines are used for the installation of home water supply communications, for installing heated floors, in sewer and drainage systems.

The characteristics and properties of metal-plastic pipes depend on the characteristics of their structure.

The wall of the pipe material is a multilayer “pie” of five layers:

Cross-linked polyethylene is an inner layer that has smooth surface and high resistance to action high temperature. The term “cross-linked” refers to the structural features of polyethylene on molecular level. The organic polymer is subjected to additional action to connect molecules with additional horizontal connections. The firmware connects up to 85% of free molecules, giving polyethylene high density, resistance to mechanical and temperature influences.
Adhesive layer.
A layer of aluminum foil.
Glue.
External, decorative and protective polyethylene layer.

Pay attention! In their structure, metal-plastic pipes resemble reinforced polypropylene pipes. However, this is a pipe material with absolutely different characteristics, since the polymer layer has different nature with different physical properties.

Positive properties of metal-polymer pipes:

Durable. With a special connection they can be walled into the wall.
They are plastic, which does not require additional bending fittings.
Corrosion resistant. The metal layer is reliably insulated with polyethylene from harmful influences.
They have a high throughput capacity and do not become “overgrown” with deposits on the inner wall.
They have good thermal conductivity and high noise insulation.
Environmentally friendly.
They are light in weight.
Compatible with all types of pipelines.
Available for self-installation.