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 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 in low pressure systems. 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;
- A pair of 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 sharply, 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 in the form of 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 guarantee of operation for 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 the pipe, and also 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.
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 installing metal-plastic pipes for water supply with your own hands 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 ones, they have several valuable properties, thanks to which they are most often used:
- metal-plastic pipes do not rust and their inner surface no deposits are formed;
- 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, it was decided to make pipeline branches to individual water collection points using tees.
After purchasing all the necessary fittings, we laid them out on the floor in the order in which they would 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 metal plastic and a 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 was done. 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. Mounting strips They are attached to the wall using dowels and screws, the pipes are carefully bent and laid in 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.
The entire work of installing the pipeline from metal-plastic pipes 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.
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:
- The inner surface is made of molecularly compacted polyethylene or cross-linked polyethylene layers.
- An adhesive layer that bonds polyethylene to an aluminum layer.
- Aluminum layer.
- The second layer of glue holding the aluminum element together outer covering.
- 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
For fastening parts different diameters, fittings are used to 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 should not lose your vigilance; the technology for installing metal-plastic pipes requires delicately careful handling of 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)
A pruner (pipe cutter) will provide an even cut line and will avoid burrs and damage to the 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 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:
- Place a tightening nut on the end of the pipe.
- Secure the crimp ring.
Important: if using a cone-shaped ring, put it on from the narrow edge.
- Insert the shank firmly into the pipe.
- Seal the fastening with flax and sealant or tow.
- 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:
- Bevel the end of the pipe.
- Treat it with a calibrator.
- Install the ferrule.
- Place O-rings on the fitting, insert the fitting into the pipe, contact point metal elements Protect with a dielectric gasket.
- Insert inserts of a diameter suitable for the part being fastened into the press tongs, and turn the handles of the tongs 180°.
- 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, a hair dryer or a pipe bender:
- Manually. The product is shaped by manual pressure. Suitable for experienced craftsmen, with small pipe diameters.
- 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.
- 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.
- 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. Therefore, open installation of metal-plastic pipes for water supply or other purposes is allowed only in areas where such factors are absent. Also, the pipeline is installed in the open after finishing the walls.
List of rules:
- 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.
- Avoid kinks, cuts and ruptures on the pipes. To avoid scratches, do not use sharp objects when unpacking the pipes.
- 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.
- 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 markings with a pencil or marker, and equip metal connections 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
Modern water supply systems can be made from different types pipes, each of them has its own characteristics and installation nuances.
Although some people may think that installing metal-plastic pipes with their own hands is a very simple task, they are not entirely right.
Conducting a water supply system from this type of pipe has its own characteristics that must be observed; only in this case will you be able to create a workable system, and it will serve you for a long time and reliably.
To perform work such as installing metal-plastic pipes, you will need a certain set of tools.
Everything will depend on what type of fittings you will use to assemble the plumbing.
Installation can be done using a special press or using crimp nuts; accordingly, the price of materials will be different.
If we talk about the effectiveness of these two connections, then it is almost the same, but if you installed the water supply using pressed ends, then in the event of a leak, it is no longer possible to correct the error and you need to buy a new fitting, it is clear that the price in this case will increase.
If you decide to do a one-time installation of metal-plastic pipes at home, then buying a press for this will be illogical, since the price of this equipment is rather high.
That is why assembling a water pipe using crimp nuts is more popular and affordable.
The tool for installing metal-plastic pipes is quite simple:
- 2 adjustable wrenches;
- special scissors;
- calibrator, this tool is needed in order to expand its internal diameter at the junction of the pipe and fitting;
- To make smooth bends, you need a spring of the appropriate diameter.
Advantages and disadvantages
The metal-plastic pipe consists of 3 layers that are glued together. Outside and inside there is a layer of plastic, between which there is an aluminum layer. They are distinguished by diameter and wall thickness, as well as by manufacturer. Products with diameters from 16 to 32 mm are produced.
If we talk about the advantages of this material, it is high flexibility and the ability to retain its shape when bending, as well as a low expansion coefficient.
If the installation technology has not been violated, then such a design will serve for 50 years or more without problems, since they are not damaged by corrosion; inside no deposits accumulate.
Fig.1 Pipe structure
The roughness of the inner surface of these pipes is almost 10 times less than that of copper and 20 times less than that of steel analogues, so to create a system you can take pipes of a smaller diameter, it is clear that their price will be less.
Unlike metal systems water supply, they do not transmit or create noise, they are easy to install and do not require welding machine or pipe bender. Another advantage is that they do not need to be painted, they are beautiful appearance will fit into any interior.
Like any other material, they have some disadvantages: they can withstand pressures that do not exceed 10 atm and temperatures up to 95 degrees. Pipes on which fittings are already installed cannot be bent if, after installation of the system, work is still underway. construction works, then you need to be careful not to damage them.
It is necessary to avoid exposing the pipes to ultraviolet rays and high temperatures for a long time.
Using compression fittings
Such elements are a fitting, inside of which there is a cut brass ring, as well as a nut. For installation you only need a key of the appropriate size. Once you have connected the pipes and begin to tighten the nut, the ring compresses and forms a strong and reliable connection.
Fig.2 Installation using compression fittings
The fact that you do not need to have a special tool and simple technology, makes this installation method popular and affordable.
In addition, such a connection allows, if necessary, to perform quick dismantling systems.
Many experts, if one of the system components fails, do not recommend replacing it; it is better to cut out this section and install a new pipe.
IN construction stores there is enough big choice fittings and when purchasing them, you need to pay attention to whether they are compatible with the pipes you purchased, and it is better to purchase everything together in one store.
Installation procedure:
- first the pipe must be straightened;
- after this it is marked;
- the cut is made strictly perpendicular to the axis;
- the cut must be processed using a calibrator;
- place the nut and ring on the pipe;
- insert the fitting to make it easier, you can moisten it with water;
- tighten the nut until it stops; there is no need to use an additional lever for the wrench.
Using press fittings
If we talk about this type of connection, it has the following advantages:
- allow you to do hidden system pipeline;
- the connection is more reliable;
- less Supplies, which significantly reduces costs.
The disadvantage is that you will need a special tool, it can be manual or hydraulic.
Sequence of work:
If you install the specified type of pipes using the technologies described above, then regardless of what type of connection you choose, you will get a reliable and high-quality water supply system that will serve you for decades.
Table 1. Material cost:
| Name | Unit | Cost, rub. |
|---|---|---|
| Pipe 16x2 mm | Linear meter | 40-45 |
| 20x2mm | Linear meter | 55-60 |
| 26x3mm | Linear meter | 80-90 |
| 32x3mm | Linear meter | 115-125 |
| Press coupling (mother) | PC. | 50-110 |
| Persian coupling (father) | PC. | 40-90 |
| Press tee | PC. | 80-250 |
| Crimp coupling | PC. | 60-120 |
| Crimp Tee | PC. | 120-250 |
Depending on the specialist you invite to perform the installation, installing one point will cost you about 2000-2500 rubles.
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
This is an aesthetic, but labor-intensive option, usually used in bathrooms, as well as in rooms 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 to ultraviolet rays (this is harmful to 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:
- Draw the lines of future installation directly on the walls - visualization makes it easier to understand where everything will be located.
- “Starting point” is the point of connection to an already installed faucet or radiator.
- Try to get by with as few fittings as possible (the fewer there are, the more stable the water pressure).
- If a corner gasket is required, decide whether to bend or use corner fittings.
- Even at the markup stage, remember: all connections must be accessible. It is also necessary to be able to tighten the fasteners if necessary.
- All connecting elements installed after marking and calculations are completed.
- By wiring 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, evaluate the 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 faucets, household appliances, and bathtubs are 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 operating pressure from 6.6 atm and temperature 95 °C and are not made of polyethylene low pressure: 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 a “weak point”, do not 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 wrench(they are used to tighten the 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 pressing 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 by heating it construction hairdryer: in several steps, without making sudden movements and keeping in mind the permissible bending radius (indicated in the technical specifications). Thumbs During this action, both hands are located along the product. 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 of metal parts is carried out with gaskets made of special 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:
- It is necessary to shut off the test area filled with water to seal it (using taps/valves).
- Connect a pump to the connection pipe of one of the taps (for home system water supply is suitable manual, low-power).
- 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.
- Maintain the system under pressure for some time - at least half an hour.
- 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, the problem area can be detected visually. After eliminating the malfunction, you will have to re-pressure test.
