Recognized champions among the pipelines used in the engineering systems of houses and apartments are polypropylene pipes. Solve the problems with the installation allow a simple form of connections and mastered welding technology. How to properly weld pipes?
Content
Advantages of polypropylene pipes
The assortment of water and heat-conducting systems is now significantly enriched due to the appearance of polypropylene pipes and fittings.
The increased popularity of polypropylene (PP) pipes is explained by the following advantages:
• significant resistance to negative and biochemical effects of water and environment
• Long service life in comparison with metal pipes
• Low head losses due to low hydraulic resistance
• the ability to create complex piping systems.
Probably, therefore, the installation of pipelines using polypropylene pipes and fittings has forced out its obvious competitors from the systems market. Moreover, for the welding of polypropylene pipes, one does not need a lot of specialized tools. It is quite sufficient apparatus for welding polypropylene pipes or a soldering iron.
The modern technology of welding polypropylene pipes provides a full-scale quality connection with plumbing fixtures.
Types of welding polypropylene pipes
There are the following types of polypropylene pipes: conventional (PN10, PN16, designed for cold water and PN20, used for cold and hot water), as well as reinforced (PN25 grade). Conventional pipes are made of a homogeneous polymer.
Reinforced PP pipes are reinforced with fiberglass or aluminum foil. Naturally, the welding time of polypropylene pipes of different types will differ. Welding of PP pipes is carried out in the following ways:
• polyphasic
• using electrofitting.
The polyfusive method of welding is based on the physical phenomenon of the penetration of a material of a homogeneous substance upon heating.
Specialized tool for welding PP pipes
There are the following tools for welding. It is an apparatus for welding polypropylene pipes and special attachments to the stinger of a welding machine.
that represents the apparatus for welding
The welding machine is a structure consisting of the following elements:
• Enclosures with insulated handle
• the regulator and the heating temperature indicator
• thermostat
• Clamps
• Supports
• sting.
The welding machine can be installed on a table top or workbench and securely fixed.
Advice from a specialist
Select the apparatus for welding PP pipes to determine the forthcoming scope of work, as well as the diameter of the welded elements. Recall that for connecting large diameter pipes use a mechanical docking machine, consisting of a support frame, a hydraulic unit and an instrument cluster. A powerful electric heating element and a rotating electric torch create maximum conditions for high-performance welding of an impressive batch of pipe and fittings.
The performance of a manual welding machine is more modest, so this type of equipment is an ideal option for welding pipes yourself. It is possible to connect pipes of diameter up to 120 mm.
functions of metal attachments to the apparatus
Special nozzles on the stinger of the welding machine consist of two parts of the same diameter. One part is heated from the tip of the apparatus to an operating melting point of 260 ° C. The other part is designed to heat the fitting. The nozzles are treated with Teflon coating, which prevents the adherence of heated plastic.
Technology of welding polypropylene pipes
The technology of welding PP pipes and fittings is already worked out, but the instructions for welding polypropylene pipes have not been canceled yet. Moreover, compliance with the rules for the production of welded work and requirements makes it possible to produce high-quality cooking of polypropylene pipes.
The technological scheme of welding consists of the stages:
• preparation of pipe and fittings
• melting of the installation site
• connections of elements.
Advice from a specialist
Specialists noted that the larger the diameter of the PP tube, the longer will be the heating period and the melting surface. Therefore, it is not recommended to neglect the time intervals and the quality of the pipeline. It is not permissible to twist the welded parts or attempt to change the position of the fitting relative to the axis. The welding site is weakened and causes a risk of pipeline leakage. Although outwardly initially this is not always noticeable.
preparation of pipes and apparatus for welding
Before the welding machine is turned on, pipes and a pipeline assembly plan are prepared. Pipes in the welding places must be degreased and dried.
A certain length of the pipe is cut using special scissors, which ensure the cleanliness of the cut without burrs of a rectangular shape.
The outer surface of the reinforced pipes is treated with a shaver, removing the reinforced layer immediately before welding.
Pipes and fittings are marked with a special marker, which shows the places of welding. The prepared elements are laid out on both sides of the apparatus. On the stump of the apparatus screw on the necessary nozzles and fix them using a key.
Advice from a specialist
The most common diameters of attachments to the stinger are the dimensions: 20, 25, 32, 40 and 63 mm, which correspond to the diameters of common pipes and pipelines.
reflow of installation site
After installing the welding pipes into the machine, turn it on and set the desired heating temperature to 260 ° C. The end of the heating of the device and the setting of the required operating temperature will be signaled by the indicators. This is in the range of 10-20 minutes. If the welding machine has two heating modes, then both modes must be turned on.
Recall that the operating temperature should be constant, according to the technological process of welding. In the case where the diameter of the welded elements is different from the previous ones, it is necessary to use a nozzle for welding polypropylene pipes of a different diameter.
pipe joint
After melting the installation site, the parts are removed from the two nozzles and connected by slow uniform motion to the mark of the marker. You need to work accurately and quickly, because you only have a few minutes left. After accurately installing the welded elements, the connected pipe must be completely cooled.
As you know, the welding view of the connection is the most reliable, and therefore popular. Especially this convenience is felt when welding PP pipes. Two graceful movements of both hands reliably connect the elements of the future pipelines, without which it is impossible to realize heat and water supply in the apartment.
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