Laying of metal-plastic pipes. How to assemble a water pipe from metal-plastic pipes with your own hands

The variety of pipes for heating and water supply makes you think about their choice. Especially if the work is done independently. But this is only the first stage of the highway installation process. Often people who engage in self-repair, questions arise regarding working with metal-plastic pipes. Each pipeline has its own nuances and assembly rules. During installation metal-plastic pipes With your own hands you need to know the features of their connection and fastening. After all, the reliability of a heating or water main largely depends on compliance with the technology and the quality of the work performed.

Features of connecting metal-plastic pipes

General information about metal-plastic pipes on the domestic market:

Option #2 - push fittings

No need additional tool for connecting pipes using push fittings. To connect, the pipe is inserted into the push fitting until it stops. The end of the pipe should be visible in the viewing window. After connecting the entire main line, the water is connected. This pushes and clamps the fitting wedge, which prevents leakage.

Advantages:

• ease and speed of use;
• no additional tools are needed for work;
• permanent connection;
• durability;
• suitable for bricking
• the finished connection can be rotated.

Flaws:

• high cost of push fittings;
• a waiting time after installation of three hours is required.

You can watch the video in more detail about this type of fitting:

Option #3 - collet fittings

Connection of pipes from different materials performed using a collet fitting. If the pipes different sizes then the thread of the part must correspond to the metal product, and the remaining components to the pipe are made of metal-plastic.

For pipes of different diameters, take a fitting corresponding to the dimensions of the metal-plastic pipe, except for the threaded part. It is selected according to the size of the metal pipe

A fitting is put on the metal pipe, first wrapping it with tow. A nut and washer are placed on the edge of the prepared metal-plastic pipe. Then connect them together and tighten the nut.

In some cases, metal-plastic pipes are used for installation of heating systems. You will learn about the pros and cons of these and other types of pipes in our material:.

Fastening metal-plastic pipes to the surface

When working with metal-plastic pipes, you need to know how to mount them to the surface. To secure the pipes you must use special clips. They are selected taking into account the size of the pipe itself. First you need to install the clip. Its fastening is carried out using self-tapping screws or dowels. To avoid sagging of the line, the distance between adjacent clips should not exceed one meter. Pipe bends must be secured on both sides.

To avoid sagging of the pipeline, the distance between adjacent clips should not exceed 1 meter. The turn of the highway in the corner of the room must be fixed on both sides

How to bend a metal-plastic pipe correctly?

The advantage of metal-plastic pipes, among other things, is the ability to bend them in in the right place. This helps reduce the number of fittings used. This feature is used when it is necessary to make a turn and install heated floors. You can bend a metal-plastic pipe in 4 ways:

• hands;
• spring;
• using a hairdryer;
• pipe bender

Option #1 - bending pipes with your hands

This method requires dexterous hands. To learn how to bend a pipe without any tools, watch the video instructions:

Option #2 - a spring will help avoid defects

There is a commercially available spring specifically designed for bending pipes. It is inserted inside the product. After this, bending is done with ease and without defects. The size of the spring is selected according to the size of the pipes.

Using a spring to bend metal-plastic pipes helps to avoid defects and damage to the product. The spring size must match the pipe size

Option #3 - using a hair dryer

Metal-plastic pipes become more pliable when exposed to heat. To heat them up, use a hair dryer. You just need to do this carefully so as not to overheat the plastic. After heating, the pipe bends in one movement.

Option #4 - pipe bender for the master

And yet, if you are a beginner master with no work experience, it is better to use. He will help without special effort bend a metal-plastic pipe of any size. A crossbow pipe bender is available for sale. To use it, just set the bend angle, insert the pipe and bring the handles together.

If you do not have experience working with metal-plastic pipes, it is better to use a pipe bender. A special crossbow pipe bender helps bend the pipe at the desired angle

Find out what advantages a metal-plastic pipe has, and whether it can be chosen for installing a heated floor:.

It is clear that without effort it will not be possible to create high-quality plumbing or heating. Any work that you will do with metal-plastic pipes, from choosing a product to checking the functionality of the system, must be treated responsibly. Only in this case can the durability of the water supply or heating main be guaranteed.

Installation of metal-plastic pipes is not difficult even for non-professionals. You don’t have to be a plumber to lay water supply pipes with your own hands: just carefully read the laying rules.

Choosing an installation option for a metal-plastic system

If you are determined to install and install metal-plastic pipes yourself, decide in advance on the option for laying the pipeline. It happens:

• hidden (the system is “hidden” in the wall);
• open (it runs along its surface);
• combined (combining both options).

The required method is selected taking into account:

• purpose of the premises;
• the need to have access to the structure.

Metal-plastic pipes are fastened to walls using special clips. For plumbing, single ones are usually used, for heating - double ones (for two-pipe systems). We select them taking into account the diameter of the product and fasten them to the wall with dowels or self-tapping screws.

To prevent the pipeline from sagging, the distance between the fasteners is 1 m or less. For heating installation, a step of no more than 0.5 m is recommended (so that the circulation of the coolant is not disrupted). The bends are fixed on both sides.

Hidden

It's aesthetic, but labor-intensive option, typically used in bathrooms, as well as in areas where the possibility of damage to the surface of the structure is expected. To cover it inside the walls, channels are dug, a system is laid and the recesses are sealed finishing materials, leaving access to the fittings (using “windows” or removable panels).

It is not advisable to use a hidden gasket:

• For load-bearing walls(it is forbidden to ditch them);
• in an already finished room (you will have to dismantle and then restore the wall covering).

The main advantage is that the type of pipeline does not spoil the design of the room.

Open

Open wiring should not be done if:

• there is a possibility of mechanical damage to the surface of the structure;
• they have access ultraviolet rays(it is harmful for them).

Advantages of the method:

• the joints are visible - easy to unscrew if necessary to clean or replace a fragment;
• no damage to the finish is caused (can be installed in rooms where repairs have already been made).

Fastening with clips to the wall should be done as smoothly as possible, remembering that the pipeline is visible: slanting lines are not pleasing to the eye.

Combined

The pipeline is laid along the surface of unformed walls and covered with special false panels or boxes are mounted. The method requires an accurate idea of ​​the future design of the room: boxes and panels should not detract from the appearance of the room, but should fit organically into the design.

Design and marking for material calculation

Work with any metal-plastic pipes (for plumbing or heating) should begin with developing a diagram of their placement:

1. Draw the lines of future installation directly on the walls - visualization makes it easier to understand where everything will be located.
2. “Starting point” is the point of connection to an already installed faucet or radiator.
3. Try to get by with as few fittings as possible (the fewer there are, the more stable the water pressure).
4. If a corner gasket is required, decide whether to bend or use corner fittings.
5. Even at the markup stage, remember: all connections must be accessible. It is also necessary to be able to tighten the fasteners if necessary.
6. All connecting elements are installed after the markings and calculations are completed.
7. Using the installation diagram (draw clearly!) the length of the pipeline, the number of fittings and fasteners are calculated.

Selection of pipe for installation

The least requirements apply to products intended for cold water supply. As for hot items, you should take goods labeled PEX (cross-linked) and PE-RT (linear) polyethylene. Before purchasing, check what indicators of normal and maximum pressure at your water supply.

Look at the certificate - does the product comply? hygienic requirements, rate appearance for dents, scratches, and other defects.

Plumbing system

For home plumbing, pipes of 16 and 20 mm in diameter are most often used. If the main wiring is assembled from 20 mm, then the connections to the mixers, household appliances, the bathtub is made from 16 mm.

Heating system

Choosing products to create heating structure, take into account the availability of quality certificates. Products must be designed for a working pressure of 6.6 atm and a temperature of 95 °C and not made of low-density polyethylene: it is neither durable nor heat-resistant. Do not purchase products marked PE-RS, they will melt if the coolant temperature exceeds 75 °C!

Selecting a fitting for joining pipes

When you install a water supply system from metal-plastic pipes yourself, you need to pay serious attention to the choice of fittings: responsibility for leaks falls on you! Fittings are considered " weak point", don't skimp on cheap options.

Compression fittings are simple, but less reliable than press fittings. Please note that hidden gaskets require the use of press fittings only. In other cases, be sure to ensure free access to compression devices.

Preparing tools and supplies

To install the structure, you will need a small set of tools (all of them should be at hand):

• pipe cutter or sharp scissors (for a tight connection, a strictly perpendicular cut is necessary);
• calibrator (needed for centering the cutting area and chamfering);
• sliding and open-end wrenches (they are used to tighten nuts in compression fittings)
• press pliers (they manually crimp press fittings);
• pipe bender (allows you to change the configuration of pipeline segments without using corner fittings - it is better to use it if there are many corner connections).

Necessary materials:

• the bay itself, measured sections of the required length will be cut from it;
• different types of fittings (tees, bypass, corner) for wiring and creating a single design;
• fastening elements (clamps and clips from the manufacturer) for fixing pipeline sections on supporting surfaces.

Laying metal-plastic pipes

How to correctly install a metal-plastic pipe:

• cut a fragment of the required length;
• use a calibrator to adjust the shape of the cut;
• chamfer from both surfaces - outside and inside - simultaneously;
• Unscrew the fitting (remove the nuts from the ends, O-rings from the fittings);
• if the fitting is compression, put a nut with a sealing ring on the prepared fragment, connect the pipe and fitting, secure the connection with the nut - first tighten it by hand, then use a wrench;
• if a press fitting is used, first disassemble it and make sure it is not defective (remember that you can’t “unscrew it back”), then place the prepared fragment on the fitting, assess the seating depth - for this there is a hole on the sleeve. Then use press pliers to press the connecting sleeve twice, forming two annular compressions.

To form the desired bend, you can use a pipe bender or bend it with your own hands, heating it with a construction hairdryer: in several steps, without making sudden movements and remembering the permissible bending radius (indicated in the technical specifications). The thumbs of both hands are positioned along the product during this action. The inner and outer layers of the product must not be deformed!

To simplify the workflow, you can first assemble the individual parts of the system. Then install the parts of the structure in the appropriate places and connect them. Each pipe is fixed to the wall using hanging and supporting elements from the manufacturer. Installation metal parts made with special gaskets soft materials. After sequentially combining all the parts, connect them to the “hot” and “cold” risers.

Pressure testing of the water supply system

When the installation of a water supply system made of metal-plastic pipes is completed, it is necessary to check it for leaks using the pressure testing process:

1. It is necessary to shut off the test area filled with water to seal it (using taps/valves).
2. Connect a pump to the connection pipe of one of the taps (a manual, low-power one is suitable for a home water supply system).
3. Using a pressure testing pump, pump water into the selected area at a pressure greater than the calculated operating pressure, then turn off the pump and record the pressure gauge readings.
4. Maintain the system under pressure for some time - at least half an hour.
5. Then the current pressure gauge readings are compared with the original value. If the two values ​​are different, something has gone wrong, there is a leak.

If you have an open gasket, problem area can be detected visually. After eliminating the malfunction, you will have to re-pressure test.

Metal-plastic pipes are widely used today in the installation of heating, water supply and sewerage systems. From the name it is already clear that these pipes are made of composite material.

They consist of a layer of metal enclosed in a plastic shell. Between the shell and metal surface There is also a layer of special glue. This design can withstand significant pressure and temperatures up to 95 degrees. Wherein. It is absolutely safe for health, does not corrode and has a fairly aesthetic appearance.

The advantage of this material is, first of all, its low cost, ease of installation, and hygienic cleanliness.

Preparation stage

If the choice fell on metal-plastic pipes for installing a water supply system, then it is necessary to determine the amount of material that will be required for the work.

This type of material is supplied in coils from 50 to 200 m long, but you can purchase any quantity in the store linear meters metal-plastic pipe. The length of the internal water supply system is measured from the riser.

Installation is carried out along the walls, slightly above the floor level, so you need to measure the distance along the length of the wall from the riser to the intended installation location of the farthest crane in your room.

Then to the resulting value, add the height from the floor to the mounting hole of taps, toilets and washing machines. As a result, you get the total length.

It’s immediately worth noting that any pipe connection significantly increases costs, and is also a place critical for the reliability of the system, so it is very important to correctly calculate the length of the entire system at the preparatory stage.

After the measurements are taken, the resulting value in meters should be rounded up to a whole number. Then you need to decide on the diameter.

Metal-plastic pipes have an outer diameter ranging from 16 to 63 mm. When installing a water supply system inside a living space, the most the best option is 20 mm. A 16 mm pipe is more suitable for installing a “warm floor” system, as well as for piping from the main line to taps and mixers.

If it is necessary to install water supply to a private house from water supply network, then the maximum diameter of this material is selected.

Installation technology

types of fittings

When installing a water supply system from metal-plastic pipes, you cannot do without additional materials and tools.

Tools that may be needed when working:

• pipe cutter or hacksaw for metal;
• calibrator;
• roulette;
• spanners;
• pliers or press (when using press fittings);

The first thing you should purchase from materials is fittings and clips for fixing the pipe to the floor or wall.

Fitting– this is the connecting part of the pipeline, used during the installation of a water supply system, used for branching, transition to another diameter, and also serves to connect pipes of dissimilar materials. The purpose of the fitting depends on its design. If you need to connect a metal-plastic pipe to a tap or metal pipe, then select the collet-thread system fitting. If between each other, then a collet-collet system is used.

In addition to collet fittings, there are designs with a crimping mechanism, which fixes a metal-plastic pipe by means of circular crimping of the pipe special pliers or press. This option is more reliable in operation, installation takes less time, but the cost of the work increases significantly, primarily due to the need to purchase special tools.

Installation using push-in fittings

device

The connection process takes very little time and consists of the following steps:

1. If it is needed, then a piece of pipe is cut off with a special pipe cutter or a hacksaw for metal.
2. Place where the separation was made is leveled using a calibrator
3. The fitting must be disassembled. Then the fitting nut is put on the pipe with the thread facing the edge of the pipe. The nut should be moved away from the edge by 20 - 30 mm.
4. On the pipe put on the collet ring and also move it a little from the edge.
5. Fitting fitting is inserted into the pipe until it stops; however, care must be taken not to damage the rubber seals.
6. The nut is tightened.

On the other hand, the fitting is connected by a threaded connection to a tap or metal pipe, or, if it is a collet-collet system, then to a metal-plastic pipe. The fitting can also be in the form of a tee for a branch in the system. If a tee is used to branch from the main line to a tap, then a tee can be used: 20*16*20.

Connection using a press fitting

You will need pliers or special electric press. The pliers are mechanical, which perform crimping using human muscle power, and can also have a hydraulic mechanism.

Installation occurs in the following sequence:

1. The pipe is cut.
2. The hole is aligned using a calibrator
3. For a metal-plastic pipe put on a sleeve for crimping.
4. To the fitting fitting the pipe is put on.
5. Crimping in progress using a manual or electric press.

If the connection process was carried out correctly, then the extruded rings should be visible on the crimp sleeve along the entire circumference.

As a result, it turns out very reliable connection, which does not require maintenance during operation. When installing heated floors, in mandatory Only press fittings are used. The use of this connection technology allows you to significantly save time on installation, this can be especially noticeable when carrying out large volume works

Pipe fastening

clips

After the water supply is assembled, you will need to install it on special clips, which must correspond to the diameter of the pipe of the appropriate size. First of all, the clips are mounted on the wall using screws.

Then the pipe is taken and forcefully inserted into these fasteners. This is the only thing possible variant fastenings

The use of rigid clamps for fixing is strictly prohibited; pipes must be able to slightly change their geometry when the temperature of the liquid that circulates inside changes. Only clips perform this function well.

How to bend a metal-plastic pipe?

The water supply cannot be installed only in a straight line. Turns are inevitable when constructing a water supply system.

It is not necessary to purchase a tool called a pipe bender if you only need to change the direction of the water pipe a few times. When using a pipe with a diameter of 16 mm, this is done manually. You just need to follow some rules that apply to all diameters.

The bending radius should not be less than 5 pipe diameters, for example, for a 20 mm pipe, the minimum turning radius is 100 degrees.

If the diameter is more than 16 mm, then in order to correctly bend, you need to use a special steel spring, which can be purchased at almost any building materials store.

The bending is done in this way. The spring is inserted into the pipe cavity and moves towards the bend. If you have to bend at a considerable distance from the edge, then a rope should be tied to the spring. This is required so that after completing the bending procedure the spring can be pulled out of the pipe.

You can also move the spring a considerable distance using a powerful neodymium magnet, which, when in contact with the pipe, must be guided along to the point of bending. When the middle of the spring is aligned with the middle of the intended bend, the pipe should be bent manually. The spring is then pulled out using a rope.

If you need to bend a metal-plastic pipe large diameter, then to the method indicated above, you need to add 1 more spring, which is put on with outside, and also leads to the middle of the bend.

A metal-plastic pipe can be bent using sand or salt. To do this, dry calcined sand or salt is poured into the cavity of the pipeline, then both ends of the pipe are securely closed with plugs, and a bend is made in the right place. After completion of the work, the sand is removed.

1. Work to carry out installation work you can do it yourself, the main thing is not to rush, and if you need to perform any action for the first time, for example, bending, then it is better to first practice on some unnecessary piece of material.
2. All work must be carried out only when the water supply from the riser is turned off.
3. Don't be afraid to use it when conducting repair work modern materials. Plastic that is used in building materials, if not heated above certain temperatures, does not emit harmful substances. Of course, this is only true for certified products purchased at specialized retail outlets.

If you plan to install metal-plastic pipes yourself, you need to know exactly what you are doing, since the material is expensive. Let's consider the features of plastic pipelines, laying technology, possible ways bending, cutting and laying, types of fastenings.

Metal-plastic structures are plastic, but you need to work with them carefully

Characteristics of metal-plastic pipes

Metal-plastic products consist of 5 structural layers:

1. The inner surface is made of polyethylene, sealed on molecular level, or from cross-linked polyethylene layers.
2. Adhesive layer, fastening polyethylene with an aluminum layer.
3. Aluminum layer.
4. The second layer of glue holding the aluminum element together outer covering.
5. External plastic covering.

In construction, metal-plastic products are popular due to their strength. The polymer layer protects the pipeline from corrosive destruction. Aluminum in the composition is the key to plasticity and shape retention during operation. When calculating footage, precision to mm is not required. All these characteristics together allow for the rapid installation of metal-plastic pipes in structures of any complexity.

Connection of metal-plastic pipes

Fittings are used to fasten parts of different diameters, design turns and branches. Depending on the type of connecting part, fastening is carried out using crimp nuts or using presses.

Press fittings are used for hidden laying of lines

The advantage of using fittings is the presence of ready-made thread cuts, which reduces the work process. But you shouldn’t lose your vigilance; the technology for installing metal-plastic pipes involves delicately careful handling consumables. As a rule, it is the hidden laying of the communication line that is carried out, therefore it is necessary to ensure ideal tightness of the joints.

Note: discard fittings with unclear or worn threads. If there is no choice, it is allowed to use a shaped part with defective notches, but only if the area of ​​the “defective” thread is no more than 10% of its total surface.

A high-quality screw fitting has smooth ends, perpendicular to the main product, without burrs or inaccuracies on the thread.

Preparatory work

Prepare a tool for installing metal-plastic pipes:

• calibrator and chamfer
• adjustable or open-end wrench (if compression fittings are used)
• press pliers (if press fittings are used)

Secateurs (pipe cutter) will provide straight line cut, will avoid burrs and damage to protective coating products when cutting. The calibrator will help to shape the part, flare it to required diameter without deformation of seals. Without experience or if there is a lack of time, it is recommended to use electric tools.

Use a pipe cutter to get straight ends.

Before installing metal-plastic pipes, regardless of the chosen type of connecting parts, preparation is carried out according to a simple algorithm:

• the surface of the pipes is marked into the required divisions;

Important: when calculating the length of the segment, take into account the centimeters included in the fitting.

• the product is cut according to the markings (work at right angles);
• if the part was deformed during the process, level it with a calibrator (you can also remove the chamfer from the inside; the outside is removed using a chamfer remover).

Select the tool according to the working diameter. If the edge of the cut is sharp, sharpen it with a sharpened metal drill with a small diameter or a round file.

Installation with compression fittings

Compression connection suitable for open installation

When installing metal-plastic pipes using a crimp (compression) fitting, make sure that all dielectric gaskets and O-rings are present on the tail section. After checking, follow the algorithm:

1. Place a tightening nut on the end of the pipe.
2. Secure the crimp ring.

Important: if using a cone-shaped ring, put it on from the narrow edge.

1. Insert the shank firmly into the pipe.
2. Seal the fastening with flax and sealant or tow.
3. Secure the fitting with a union nut, tighten it, adjusting the pressure so as not to damage the fastener, but to ensure complete tightness.

Tip: use 2 wrenches for reliability - hold the fitting body with one, and tighten the nut with the second.

Working with press fittings

Here's how to properly install metal-plastic pipes using press fittings:

1. Bevel the end of the pipe.
2. Treat it with a calibrator.
3. Install the ferrule.
4. Place O-rings on the fitting, insert the fitting into the pipe, contact point metal elements Protect with a dielectric gasket.
5. Insert inserts of a diameter suitable for the part being fastened into the press tongs, and turn the handles of the tongs 180°.
6. Place the connection in the pliers, close the handles and crimp until it stops.

Video: How to work with press fittings

Pipe bending and fastening

Metal-plastic lines are secured to walls and other surfaces using special clips. Such devices make it easier to dismantle metal-plastic pipes with your own hands if necessary.

If the product is deformed, a calibrator will help return it to shape.

Choose clips according to the size and diameter of the pipes.

How to attach: install the clip using dowels and self-tapping screws. To prevent the pipeline from sagging, install fastenings to the wall at a distance of no more than 1 m. When turning or existing bends, the pipeline is fixed on both sides.

You can bend a piece of metal-plastic with your hands, using a spring, construction hair dryer or pipe bender:

1. Manually. The product is shaped by manual pressure. Suitable for experienced craftsmen with small pipe diameters.
2. The use of a spring prevents deformation (stretching, tearing, uneven bending) and simplifies operation. The device is inserted into a bendable part and can be bent. The spring must correspond to the working diameter.
3. The heat of the hairdryer softens the plastic, and the product made from it bends in one movement. The main thing is not to overheat the material.
4. A pipe bender will ensure a perfectly even turn. You need to set the bending angle, insert the part into the grooves and bring the handles together.

Rules for working with metal-plastic

Plastic is vulnerable to UV radiation, thermal and mechanical damage. Because open installation metal-plastic pipes for water supply or other purposes are allowed only in areas where such factors are absent. Also, the pipeline is installed in the open after finishing the walls.

List of rules:

1. If you are making a hidden highway, provide hatches and removable panels without sharp edges in the ceiling so that there is access to joints and fittings.
2. Avoid kinks, cuts and ruptures on the pipes. To avoid scratches, do not use sharp objects when unpacking the pipes.
3. Pass the pipeline through walls and other ceilings using sleeves, the diameter of which is 5-10 mm larger than the outer circumference of the pipe.
4. Remember: installation of metal-plastic products can be carried out at a temperature not lower than 10°. If consumables were with sub-zero temperature, before using, let them warm up to room temperature.

Make the markings with a pencil or marker, and metal connections equip with gaskets made of soft materials.

You can easily cope with the installation of metal-plastic structures if you follow the manufacturer’s instructions and be patient.

Video: How to install a compression connection

Tsugunov Anton Valerievich

Reading time: 4 minutes

Where to start replacing the water supply

Pipe installation begins with markings. You can sketch out a plan of the apartment on paper and mark where the water supply will go. This will allow you to accurately determine the amount of material, adapters and tees. You can do it even simpler: make markings and necessary calculations right on the walls. You won’t need to constantly look at the drawing, everything will be right before your eyes.

Please note that the liner must be double: hot and cold water. Then you can make additional bends only for cold water, for example: to the toilet or washing machine.

Important! The water supply system is replaced in the entire apartment at once. This will eliminate this, which will greatly simplify doing the work yourself.

After all measurements have been made, you need to prepare necessary tools. For metal-plastic products this set is minimal.

You will need:

1. Kit wrenches(including adjustable), hammer drill and pliers.
2. Buy a calibrator. You will need this tool to flare pipes.
3. Special scissors. Unlike metal, plastic is quite easy to cut with your own hands; you don’t even need to make any special efforts.

After this, you need to turn off the water supply. If you live in a private house, then there will be no special problems; you just need to turn off the inlet valves. IN apartment buildings you will have to block the entire riser. Therefore, it is necessary to warn your neighbors in advance and call a plumber. By the way, you will need a housing office worker to replace the inlet valves near the apartment. If the installation can be done by yourself, then the valves should only be changed by a professional. Then the old water supply in the apartment is dismantled and work can begin.

Filters are installed immediately after the inlet valves. After them, water meters are usually installed. You can install them yourself, but it must be done by a Vodokanal employee.

After this, the pipes are cut in accordance with the prepared drawings. For this you will need special scissors. Metal-plastic products consist of three layers, which are connected by an adhesive layer. Therefore, such products must be handled very carefully. Using scissors you can get the smoothest possible cut. When using a hacksaw or other tools, sharp edges may remain on the cuts, which will lead to damage rubber seals. During cutting, products may become deformed; you can return them to their original shape using a calibrator.

Metal-plastic pipes are connected using fittings. They do this as follows:

• The inner surface is leveled using a calibrator.
• Insert the fitting.
• Tighten the clamp and screw on the nut.
• Insert the end of the pipe on the other side of the fitting.
• Tighten the structure with keys.

As you can see, installing a water supply system with your own hands is not particularly difficult. But there are some nuances:

• Be sure to tighten the fittings using two wrenches. One holds the fitting, the other screws on the nut. This must be done extremely carefully. The fittings are quite fragile; applying a fair amount of force can damage the structure. The nut must be tightened until a characteristic cracking sound appears. You shouldn't be too zealous either. Places threaded connections It is recommended to treat with silicone or sealant for reliability.

• In any apartment there is a corner where the pipe just needs to be bent. Plastic is a fairly flexible and elastic material, but you can hardly do it yourself. Installation of a water supply system can be significantly simplified by using a spring to bend metal-plastic pipes. If the pipes are not in plain sight, bending them would be the best option. Any, even the most expensive fitting, does not exclude possible leaks. At the bend point, the pipe remains intact, which prevents leaks in principle.

• Installation water pipes to the wall can be done using special plumbing clips. Such clips are easily attached to any flat surface, after which the pipe is simply inserted into the clamp. Plumbing clips come in different diameters, so they are suitable for any pipes. To ensure that these devices hang evenly on the wall, it is recommended to perform preliminary markings.

At this point, do-it-yourself water supply installation can be considered complete. All that remains is to supply water to the apartment.

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