How to solder polypropylene pipes

Often the question arises, what kind of material is polypropylene and how to solder polypropylene pipes. To date, to perform the installation of plumbing, heating or sanitation using the popular method of soldering pipes made of polypropylene. This material is characterized by durability and high technical performance. Therefore, many are interested in how to solder polypropylene pipes in order to get an effective result of work. As with any installation, this process requires accuracy and patience.

Soldering of polypropylene pipes

Soldering of polypropylene pipes is carried out using a soldering iron with special nozzles for heating pipes.

Technical characteristics of pipes

Before you begin, you should know what kind of pipes are needed for a particular process, how to properly solder polypropylene pipes with a special tool. Their assembly is performed using a soldering iron and fittings, which include couplings, angles, tees, etc.

Technical parameters of welding (soldering) polypropylene pipes

Technical parameters of welding (soldering) polypropylene pipes.

This type of pipe is used when installing any type of pipeline. At the same time, they can be mounted both in the open form and in the closed form, for example, when they are strocked in the wall. For their soldering are used connecting fittings, providing a molded connection, and threaded, in which it turns out to be detachable.

Polypropylene pipes are divided into 4 types. The first PN10 includes pipes whose working pressure is 1 MPa. They have thin walls and are used when installing underfloor heating and for supplying cold water up to +20 ° C. Material brand PN16 is used for holding cold water, as well as for heating systems with low pressure. Pipes of the PN20 type are universal and have a working pressure of 2 MPa. They are mounted when laying any water supply for both cold and hot water. The latter type PN25 includes pipes having a working pressure of 2.5 MPa. This material is reinforced with aluminum foil and is designed for the installation of any heating system, as well as for hot water supply.

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Rules for soldering polypropylene pipes

Welding of polypropylene pipes

Welding of polypropylene pipes sober.

Would need:

  • soldering machine;
  • special keys.

Polypropylene pipes are interconnected with a soldering iron with special nozzles. These include the sleeve, designed to melt the surface from the outside, and the mandrel, necessary for melting the surface of the socket directly at the connecting part from the inside. These nozzles have teflon coating and diameters ranging from 16 to 40 mm. After each welding, non-stick material is cleaned necessarily hot with a cloth from tarpaulin or wooden scrapers.

Before operation, the welding machine for stability is mounted on a horizontal surface so that it does not fall. And on it replaceable nozzles of the size, necessary for work, are fixed by means of the keys intended for these purposes. Their location depends on convenience during the installation process.

Soldering iron structure for plastic pipes

The structure of the soldering iron for plastic pipes.

For example, to install a branch of a pipeline located on a wall, they are placed near the end. When performing work in a vertical position and in inconvenient places for soldering, one more person is needed. To obtain better quality joining of polypropylene pipes, all elements of the future pipeline are assembled separately.

To solder polypropylene pipes should be, observing the temperature regime. Heating the soldering iron directly depends on the ambient temperature and lasts for 10-15 minutes. In hot weather, the welding time should be reduced, and with cold air, on the contrary, increased. If the temperature is below 0 ° C, the connection of polypropylene pipes and fittings using a soldering iron is prohibited. The soldering process of this material is provided only at 260 ° C. You also need to choose the right time interval for soldering and cooling, which depends on the diameter of the pipes, i.e. the more it is, the more time is spent.

Readiness for operation of the device is notified by means of the indicator. To obtain a strong and reliable weld, the soldering iron must be fully heated. Otherwise, the parts will not reach the temperature of viscous plasticity, so the material will not diffuse. In the event that the soldering iron is overheated, excessive adhesion of polypropylene may occur and, as a result, loss of stability of the form. During the entire soldering process, the device must always be on.

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Soldering of polypropylene pipes

Scheme of installation and soldering of polypropylene pipes

Scheme of installation and soldering of polypropylene pipes.

Would need:

  • polypropylene pipes;
  • welding machine;
  • plastic cutter;
  • shaver;
  • welded saddle.

Soldering pipes made of polypropylene can be performed coupling, socket or butt method. With the coupling connection, the two parts are fastened with a special coupling, and the fittings with a socket are used for the connecting nodes with a thread. This type of soldering is used for polypropylene pipes having a diameter of less than 63 mm. Butt welding is carried out without additional details and is carried out for pipes whose diameter is over 63 mm. The pipe-like method of soldering pipes with a small diameter is carried out either by a hand-held apparatus for welding, or with centering devices.

To perform a socket soldering, first with a scissors or plastic cutter at right angles to cut the pipe of the required length. If the product is reinforced, then the ends are cleaned. For this, the shaver removes the two upper layers: polypropylene and aluminum. Stripping is performed to a depth by the stop of the tool, which determines the depth of welding. Further, the surface of the parts is cleaned and degreased. After that, you can proceed to soldering. First you need to heat the soldering iron to the required temperature and after 5 minutes you can start the first welding.

Spike connections need to be done quickly, otherwise they may be deformed.

Butt welding of polypropylene pipes

Butt welding of polypropylene pipes.

When heated, the angle of rotation is allowed, not exceeding 100 °. In order to avoid unnecessary movements during the welding process, it is necessary to first mark the corresponding landmarks on the pipes. When finished soldering, it is necessary to withstand the time required for cooling, especially for thin-walled material. In this case, during the cooling process, in no case should the elements be rotated or bent. If the connection of the fittings was performed incorrectly, then the connection fitting must be cut out to correct the error. When welding elements such as angles, tees and ball valves, they are taken into account in which the handle must move freely in any position. At the end of the work, all the elements being welded are fixed together and are not subjected to any loads. Soldering propylene pipes should be a tool with clean nozzles.

If there is a need to install an additional branch on an existing pipeline, then welded seats are used. At the same time, a special device with a drill and special nozzles of welding tools for them will be required for work. First, a hole is drilled in the pipe wall at a temperature of 260 ° C. A heating nozzle is inserted into it so that the tool completely reaches the pipe wall outside. After that, the seat fitting is installed in the heating sleeve, and the surface of the welded seat should be completely close to the tool arch. All elements should heat up in the interval of 30 seconds. Then you need to remove the device for welding and quickly insert the fitting into the heated hole.

The welded seat is pressed tightly against the outer surface of the pipe and fixed in a fixed position for about 15 seconds. It takes 10 minutes to cool the compounds, and after that you can subject them to any kind of stress.

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