XLPE heating pipes: how to do it yourself

Recently, communications made of cross-linked polyethylene are gaining great popularity, since this material is relatively inexpensive and has a number of significant advantages: the optimal combination of strength and flexibility, resistance to high temperatures, chemical compounds and destruction. A decisive role in the long period of operation is played by high-quality work on fastening all the constituent elements. The assembly of such structures is a rather simple process, however, it has certain features and important points, the knowledge of which will make it possible to carry out the installation of cross-linked polyethylene pipes with your own hands without any particular difficulties.

Modern stores present to the eyes of buyers a huge selection of products intended for equipping the communication systems of private houses and apartments. However, pipes of the Rehau brand occupy a leading position in this market segment. With vast experience, German suppliers have been specializing in the manufacture of high-quality consumables for quite some time, which has allowed them to acquire a solid reputation.

Find out the cost of heating

Features of joining products

The named manufacturer chose thermoplastic polymers with a linear molecular structure as the basis for such pipes. The only difference from the products of competing companies is the optimal elasticity of the elements, which gives the joints the required tightness. However, in order to carry out a high-quality installation of Rehau pipes, the use of welding machines operating at extremely high temperatures will be required.

Repair of heating systems

The main principles of installing HDPE pipes

Heating systems laid with cross-linked polyethylene pipes do not differ in design from standard ones. All heaters are connected in the usual way. Some features are in the order of installation of the HDPE pipeline itself:

with a high temperature difference between the street and the house, it is undesirable to start installation immediately after delivery of the pipes. The pipes should be allowed at least a few hours to “warm up”.
it is undesirable to lay a cross-linked polyethylene pipeline in an open way. These pipes are quite sensitive to mechanical damage, so it is better to hide them in the ceilings of walls and floors.
XLPE has a high coefficient of linear expansion. Therefore, the niches for the pipeline should be slightly larger than the pipe diameter. It is strictly forbidden to fill HDPE pipes with a continuous layer of concrete or screed.
mechanical fittings used during installation should not be hidden in the ceiling of the walls. They must be freely accessible.

Important! If the installation of the XLPE heating pipe is carried out by welding, the temperature of the soldering iron must be carefully monitored. Polyethylene is fusible, therefore, due to exposure on the soldering iron for more than 10 seconds, the pipe may simply burn out.

XLPE pipes are a great option for home heating systems. With proper installation and operation, they will serve for a long time and with high quality. Their characteristics allow the system to operate flawlessly for five decades.

Mounting types

The connection of polyethylene pipes is carried out in three ways:

Compression fitting. This type is the simplest and requires common tools. It finds its application in the arrangement of both hot and cold communications, and also provides the ability to quickly dismantle the structure in case of unforeseen situations.
Press fitting.The named type of fastening allows you to obtain a solid and reliable connection when joining several pipes. In such an embodiment, the emphasis is on the regenerative property of cross-linked polyethylene, which allows it to return to its original shape after pressing. The polymers included in the composition fill all gaps and ensure tight contact.
Electrofusion fitting. The presented type is quite rare in practice due to the fact that it requires special welding machines and special skills. However, it is the most effective of all these methods.

An important point in determining the optimal type of connection is taking into account the pressure of the future communication system, since the first type of attachment can withstand up to 2.5 atm, the second - no more than 6 atm, and the third is practically unlimited.

Water supply systems

Heating history in different years

In mass production in the 20th century, water pipes were made of galvanized steel, but when used, they caused great inconvenience to the consumer. Due to problems with intense rust build-up, the volume of water passing through was significantly reduced. In the 1960s, galvanized pipes were replaced with plastic pipes with fittings.

Now the most popular way to transport water in hydraulic heating systems is the installation of polyethylene pipes.

XLPE is best suited for recirculating hot water in your home, so this is the best solution. Therefore, more and more often, copper and galvanized pipes are being replaced by polyethylene ones.

Execution order

Each type of connection has its own characteristics and a slightly different procedure:

The crimp type provides for reliable fixation of the compression nut on the cut of the pipe, while its thread should look towards the future connection. Then it is necessary to tighten and secure the split ring in such a way that the end of the pipe is at a distance of no more than 1 mm. Next, on the fitting of the fastening device by pulling the cut of the pipe with the elements prepared on it. At the end, with wrenches, we tighten the compression nut until it fits snugly.
In the press type, the clamping sleeve must first be securely fixed to the pipe cut. Then, using the expander, we pull the connecting pipe onto the fitting of the fitting device and hold it in this position for several minutes. Subsequently, due to the completion of the last point, the pipe segment will press itself as tightly as possible.
The electric welding connection is carried out by fixing a special coupling on the pipe cut. Then, by means of welding equipment, the end of the inner spiral of the fitting device should be heated. As a result, the heated polyethylene ideally takes the shape of a fitting and cools, while ensuring the most tight contact.

Reinforced plastic tubes.

Reinforced-plastic pipes.

The multilayer structure of polypropylene and aluminum layers makes the reinforced-plastic pipes durable and resistant to damage. Products are not afraid of high temperatures up to + 95 ° С. Despite the presence of metal in the composition, such pipes do not oxidize and perfectly resist corrosion due to the properties of aluminum.

Reinforced-plastic pipes are simple and easy to install, as they are elastic and easily bend in different directions. Docking of products is possible using both fittings and soldering. The material is suitable for use in cold and hot water supply systems, has a long service life and an affordable price.

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Features of XLPE heating pipes

It is known that polyethylene is a fairly low-melting material, in its normal state it begins to soften even at a temperature of 40 degrees. Conventional polyethylene pipes are not suitable for heating. But modern manufacturers have managed to create a fundamentally new type of polyethylene - cross-linked, the technical characteristics of which have nothing to do with the usual. Molecular compounds in such a material provide maximum strength to the finished product. Cross-linked HDPE pipes are PEX marked and are widely used in heating systems.

It is worth considering the fact that polyethylene pipes do not tolerate exposure to sunlight at all. When the pipe surface is heated for a long time by ultraviolet rays, the cross-linked polyethylene begins to disintegrate, making the water toxic. To reduce the influence of sunlight on polyethylene products, it is recommended to varnish them.

The soft walls of HDPE structures attract rodents and insects. It happens that pests eat holes in pipes, which causes water leaks. Therefore, XLPE pipes are not recommended to be laid in the ground without protection.