Now, when installing water pipes and heating, polypropylene pipes are increasingly used instead of metal, which are superior to metal in many parameters. Learning how to properly dock plastic pipelines into a single system is a skill that is useful to any person. This also applies to the laying of new lines, and the repair of existing highways. When soldering polypropylene pipes, the instruction obliges the master to study all the details of the process, to know the device and principle of operation of the apparatus for soldering polypropylene pipes, and also to take into account the recommended heating time of the connected elements.
Materials and tools that you need to prepare for work:
- Polypropylene pipes. To install cold water supply, it is enough to use simple thick-walled products that can withstand temperatures up to 20 degrees. If the water supply is hot, or a heating system is being installed, then pipelines reinforced with fiberglass or aluminum foil are taken. They are able to withstand water heating up to 90-95 degrees and increased water pressure.
- Connecting fittings of various shapes and purposes. With their help, pipe sections are connected at different angles, wiring and turning of highways are provided, the combination of pipelines of different diameters, the connection of metering devices, and the muffling of certain sections.
- Soldering iron for plastic pipes with a set of nozzles for soldering different diameters.
- Special scissors designed for cutting pipes. Unlike a grinder or a hacksaw, they do not leave burrs on the ends of the pipes.
- Shaver. This is a tool for removing the aluminum reinforcing layer. Without removing it, soldering will be impossible.
Tip: If you have to do a one-time job of soldering a polypropylene pipeline, then it will be more profitable to rent a device with nozzles for a couple of days than to buy it.
Soldering step by step instructions
First of all, a diagram is drawn up, which indicates the location of all future pipelines, fittings, turns and entrances to the walls. Also, segments of polypropylene pipes are pre-cut according to the calculated values. The chamfer is removed from the outside of all pipes. The nozzles of the welding machine and the pipe sections to be connected are degreased. It is recommended to make marks on the surface of all pipes, through which it will be convenient to control the depth of their entry into the soldering iron.
The technology for soldering polypropylene pipes determines the following sequence of actions for the master:
The photo shows the process of connecting polypropylene pipes Tip: If there are traces of polypropylene on the surface of the nozzles, heat up the soldering iron, and then remove them with a regular rag.
Features of soldering reinforced pipes
We figured out the technology of connecting thick-walled pipes made of polypropylene. Now let's see how to properly solder polypropylene pipes for heating. The difference in soldering reinforced pipes from conventional pipes is that it is necessary to remove aluminum foil from each section of the connected segment. Otherwise, the soldering quality will be unsatisfactory. This operation is performed using a metal shaver that cuts off the foil layer if it is located outside the pipe. After that, soldering is performed by the standard method.
If the foil layer is inside polypropylene, then a special trimmer is used. He selects the inner layer of material from the end of the pipe and aligns the end of the product, ensuring a reliable connection.
If the pipe is reinforced with fiberglass, then its soldering is no different from working with products that do not have reinforcement.
Recommendations for performing high-quality soldering of polypropylene
In the process of performing work, consider the following features of the process:
- high-quality soldering is possible only on dry pipes. The presence of moisture drops can hopelessly ruin the connection;
- nozzles on the device must be fixed very tightly. If they hang out, then the apparatus will very soon become unusable;
- when heated, polypropylene shrinks slightly, due to which the length of the pipe segment may decrease by 1 mm. Therefore, when calculating, make a small margin of the pipeline along the length;
- pipelines are best connected in a horizontal position. In this way, unintentional shifts of the connected components can be avoided. And how to solder polypropylene pipes in a vertical position? If such a need arose, then the master holds the soldering iron, and his assistant connects the elements;
- do not overheat the soldering iron, as already at a temperature of 270 degrees polypropylene may begin to collapse;
- if it is necessary to join together polypropylene and metal pipes, then use combined fittings. A metal pipe is attached to one end of such a fitting, and its other end is joined to a polypropylene pipe by soldering;
- in the room where work is being done on laying a polypropylene pipeline, a positive temperature must be maintained.
It is very important to choose the right tool for soldering polypropylene pipes. The less plastic inserts and parts in the device, the more reliable it will be. The presence of a high-quality thermostat in the device will allow you to more firmly connect the elements to each other. The power of the soldering iron is also important. For home soldering of pipes of small diameter, 700 W will be enough, and for professional use, choose more power.
Soldering iron tips are usually Teflon coated. To protect it from scratches, store the device with attachments only in a special box.
We hope you are convinced that having instructions for soldering polypropylene pipes with your own hands is a completely doable job even for an inexperienced craftsman in such matters. The main success factors are accuracy and precision, as well as the use of high-quality tools and components.
Read about how to choose in a separate article.
About the types of polypropylene fittings we.
Do-it-yourself soldering of polypropylene pipes video
How to solder polypropylene pipes video tutorial will show clearly.
Plastic pipes are used more and more often than metal pipes, since they have undeniable advantages, which include a longer service life - up to 50 years for polypropylene pipes, as well as high sound insulation characteristics, resistance to temperature fluctuations, low electrical and thermal conductivity.
PVC pipes are also popular because they are very durable, reliable and easy to install. 
Initially, such products were not soldered. Polypropylene pipelines were connected by gluing with special adhesives.
In some parts of the world, small-diameter polypropylene pipes, which are used indoors, are still connected by gluing today.
However, this method of fastening, such as soldering, is more reliable and simpler. From this article you will learn how to solder polypropylene pipes with your own hands.
And so that you better understand the technology of work, we recommend reading articles and watching videos on how to solder polypropylene pipes.
For soldering you will need:
Most of these tools are well known to those who have ever been involved in construction work.
Therefore, if you decide: we solder polypropylene pipes ourselves, you are probably familiar with the necessary tools, or you can borrow them from your friends or colleagues.
If you don’t already have the tools, all of them are easy to get at the building materials store. It can be difficult to find only suitable scissors and a soldering iron. As a rule, they are purchased as a set.
How to solder polypropylene pipes with and without a soldering iron?
Of course, this tool must be available if you are going to join PVC pipes. Specialized scissors are also called roller pipe cutters. 
The tool is available for sale in one of two modifications for its intended purpose:
- for pipes with an outer diameter of 1.6-4 cm;
- for pipes with an outer diameter of 1.6-11 cm.
Soldering iron selection
A soldering iron suitable for cutting pipes is also called a manual welding machine. The tool is a heating device that has a sole equipped with heating elements.
As a rule, it is equipped with holes of different diameters, in which nozzles for soldering are fixed. The soldering iron is equipped with a temperature regulator. 
It also has a heating indicator, a comfortable handle and a special stand. The latter allows you to install the device on a flat surface. The tool is turned on and off by pressing additional switches.
It is the soldering iron that helps answer the question of how to solder polypropylene pipes for heating or plumbing, how to connect them.
As a rule, they allow you to perform complex work.
- Soldering iron tips are coated with a non-stick coating similar to the coating used in cookware.
- Therefore, the instrument requires special care and cleaning.
Before starting soldering work, you should carefully study the technology, the necessary instructions, learn how to use a soldering iron to reduce the risk of fatal errors.
When soldering pipes, it must be remembered that this is part of the soldering of the pipeline, so work should begin with their most difficult step - marking. 
It is the markup that will tell you how to solder polypropylene pipes evenly. It is good when the markup is performed by a specialist who is familiar with the drawings of the pipeline system and represents the implementation of the drawings.
Pipe cutting
Before cutting the pipes, measure the interval between the fittings and add 3 cm to the resulting distance. After that, the pipe is carefully cut at a right angle with special scissors. 
Fittings are put on the pipe, marking the depth on it with a marker, thereby applying a transverse mark to the product. And the longitudinal one will make it possible to join the pipeline elements along the axes.
Soldering polypropylene pipes
First, turn on the soldering iron and insert a nozzle of the desired diameter into its hole. Using a temperature controller, it is necessary to set the optimal soldering temperature.
At what temperature should polypropylene pipes be soldered?
- 260°С– for polypropylene pipes;
- 220°С- for polyethylene.
The soldering iron is heated for 10-20 minutes. The readiness for operation can be recognized by the heating indicator. 
Next, a pipe element to be heated is put on the soldering iron nozzle at a moderate pace. It is heated for the time required by the technology and quickly removed from the nozzle, holding the soldering iron, if necessary.
The heated element is put on the pipe, combining the transverse and longitudinal marks. After that, they are convinced of the quality of the connections. It is important that the solder seam is even in appearance.
For a quality connection, it is better to solder the pipes for the time indicated in the technological tables. 
Protective gloves must be worn during work. It is necessary to work with polypropylene pipes carefully and patiently.
Soldering pipes is a simple process, but very responsible. If you want to better understand how to solder reinforced polypropylene pipes, the video on this page will help you understand the technology of soldering.
Connection of PVC pipes with metal-plastic pipes
How to solder polypropylene pipes with an aluminum layer? How to connect them? Is it possible to solder polypropylene pipes from different manufacturers?
First of all, they feel the joints, especially carefully watching the threaded connections.
Sealed joints occur very rarely if the work is carried out in accordance with the technology and the specialist knows well how to properly solder polypropylene pipes for heating, plumbing, reinforced with fiberglass or aluminum, large or small diameter.
But if a leak is found in the soldered pipes, the water is shut off, and the vulnerable pipe connection is redone, having previously been cut off. Before soldering, the pipes are wiped dry so as not to break the soldering iron and warm up the polypropylene well.
If a leak is detected at a threaded connection, it can be carefully tightened with a wrench so that the thread does not break.
Another option is to strengthen the seal. But in the latter case, you need to turn off the water and unwind the connection.
Now you know more about how to solder polypropylene pipes with a soldering iron, what tools to choose for installation work and how to use a soldering iron correctly.
Plumbing and heating systems are integral elements of any modern apartment or house. The basis of these systems are pipes. Traditional cast-iron and steel structures are being replaced by more durable and easy-to-install polypropylene plumbing and heating structures. They are plastic, easily repaired or replaced, not subject to corrosion.
The right choice and their competent connection will ensure the durability of plumbing and thermal heating systems.
The main types of polypropylene pipes
The selection of pipes directly depends on the purpose of their application. The main parameters are considered: the temperature of the medium that will be carried out through the pipeline and the operating pressure of the system. No less important is the diameter of the pipeline, and it depends on the volume of liquid that the pipeline must pass.
For cold water pipelines, pipes without a reinforced component are used with the following markings:
- PN 10 - the product is designed for liquid temperatures up to 20 degrees when used in underfloor heating systems up to 45 degrees with a maximum pressure in the system up to 1 MPa;
- PN 16 - the product is used in cold and hot water supply at liquid temperatures up to 95 degrees and pressures up to 1.6 MPa.
Products with higher thermal characteristics and the ability to work in cold and hot water supply systems with high pressure are marked with indices:
- PN 20 are used in temperature conditions up to 95 degrees and maximum pressure up to 2 MPa.
- PN 25 are used in hot water heating systems. They have a reinforced component, which significantly increases strength. Operating temperature up to 95 degrees and maximum pressure up to 2.5 MPa.
In addition to pipes, for the installation of the system, connecting elements are required that allow you to create an integral heating or water supply system, taking into account all the necessary requirements for each individual case.
Fittings and couplings - types and purpose
When laying a water pipe to connect sections of a water main use special couplings and fittings of various shapes. They are straight and angled.
For branching, branching fittings of various configurations are used, as well as fittings for the transition of polypropylene pipes to other connectors of the plumbing system, for example, flexible connections leading to points of water loss, taps, mixers.
Before installing a plumbing or heating system a drawing is drawn up, taking into account all the turns, branches and connections to consumption sources. This helps to calculate the required type and number of couplings and fittings. After acquiring all the elements, proceed to the installation of the structure.
Welding tools
The soldering technique consists in heating the material of the surfaces to be joined until melting, followed by joining and fixing. To carry out these works, it is necessary to prepare special tools.
- Specialized soldering iron.
- Scissors for cutting polypropylene pipes.
- A device for cleaning the reinforced part of pipes - a shaver.
- Alcohol-based degreaser.
And you will also need a tape measure, a knife, a corner, a piece of an unnecessary rag, a file or a skin, a marker.
soldering iron
This basic tool, necessary for soldering polypropylene products, can be of two types:
- Manual type designed for soldering parts of the pipeline of small diameter up to 65 mm. There are two types: cylindrical and sword-shaped. It is used for domestic purposes, it is distinguished by its low cost and compact appearance.
- mechanical type- these are automatic or semi-automatic welding stations for the installation of large diameter pipes over 63 mm. The alignment and connection of the elements takes place with the help of special devices based on the hydraulic or mechanical principle of operation. Such a soldering iron is large and expensive, designed for use both indoors and in the field.
For the installation of a heating system, water supply in an apartment or house, a manual soldering machine and nozzles for it are used. Nozzles are supplied with the soldering iron and are available in various sizes to meet the standards of produced pipes up to 63 mm in diameter. Each nozzle corresponds, on the one hand, to the inner diameter, on the other hand, to the outer diameter of a pipe of one or another standard. Nozzles are covered with a teflon sputtering. This makes it easy to release the heated part of the products for subsequent soldering together.
Scissors
A tool that allows you to cut a polypropylene product at an angle of 90 degrees with respect to the pipe length vector, while maintaining a smooth cut edge. This is very important for the reliability of soldering joints.
Shaver
This is a device for proper stripping of the reinforced layer. Allows even and to the required depth to clean the outer diameter of the product to pure polypropylene on pipes with top reinforcement.
Degreaser
It is necessary for high-quality melting of products and hermetic connection of the structure.
Soldering polypropylene pipes is not difficult, but it requires accuracy and accuracy in observing a few technological requirements. How to properly solder polypropylene pipes will be described below. The elements are connected by socket soldering with simultaneous heating of the outer part of the pipe and the inner part of the coupling or fitting with a soldering machine using a nozzle corresponding to the dimensions of the soldered elements.
After heating to the required temperature, the parts are removed from the nozzle and quickly connected and form a monolithic assembly, in other words, they are fused together. The method is called diffusion, since the parts after heating can be connected without hindrance. After solidification, an airtight joint is formed. For high-quality correct connection of pipeline elements, it will be necessary to carry out a number of preparatory work.
How to solder pipes
Training
Before starting the installation of the pipeline structure, it is necessary to cut the pipes correctly so that there are no problems with joining the elements. All cuts of the material must be made with scissors at an angle of 90 degrees. They make it possible to make the most accurate cut with a smooth edge.
Then you need to mark the dimensions of the connecting surfaces. To do this, the depth of heating of the fitting or coupling is determined by marking the depth of the nozzle with a pencil or marker. A mark of the same size is made on the pipe.
Preparation of the soldering iron consists in installing the device on a working stand. Nozzles corresponding to the diameters of the mounted parts are attached to the heating surface. Mounting elements should relatively easily fall into the heated nozzles.
On the soldering iron temperature control knob the optimum temperature is set heating, it is usually 210-260 degrees, polypropylene begins to melt at 170 degrees. The parts to be connected are simultaneously put on the heated nozzles to the depth marked with a marker.
After waiting for the softening of the surfaces (the time required for this can be determined from special unified tables), the parts are interconnected to the marked depth. The elements are connected with little effort, but without turning along their axis - this is Absolutely forbidden and violate the tightness of the alloy of heated surfaces.
Temperature parameters of installation
The soldering temperature of polypropylene pipes depends on the diameter and thickness of the product and starts from 170 degrees. For the convenience of calculating the heating time, there are special tables. Below are the time parameters for heating the main diameters of pipes used in the installation of domestic heating systems or water supply at a heating temperature of the soldering unit of 240 degrees.
Using the parameters of optimal heating, joining and cooling of the connected elements, they achieve reliable soldering of polypropylene pipes and other components of the pipeline.
Cold water pipelines
For the installation of cold water supply, you can use any polypropylene pipes, including PN 10 and PN 16 brands. These models are thin-walled and require careful handling when joining the melted parts, minimal effort is applied to connect them. It is also necessary to strictly observe the time of necessary heating of the parts of the connection. For cold water supply, as a rule, non-reinforced pipes are used, so additional processing of the connecting ends is not required. Before starting the installation of the main structure, it is better to first make several test connections to select the optimal heating temperature of the soldering iron.
Pipelines of thermal mains and hot water supply
Hot water passing through the pipes causes a slight expansion of the material and, as a result, an increase in the length of the product. To compensate for this phenomenon during installation, it is necessary from time to time to make U-shaped curvature of the line. The high water temperature is also requires the installation of specialized reinforced pipes, which are made slightly larger than the diameter required for joining. Carefully cut off the excess layer of material with a shaver. This is necessary to compensate for the expansion along the width of the pipe when heated. Further actions occur in the same way as when joining a cold water supply.
Repair of failed sections of the highway
When a pipe breaks, leaks, or as a result of poor-quality soldering, it sometimes becomes necessary to replace the failed section. To do this, the water supply is turned off and the damaged area is cut out with special scissors. In places of cut, the edges of the pipes are necessarily dried, cleaned and wiped with an alcohol-containing degreasing liquid. Only after that they begin to weld a new serviceable piece using the methods described above, depending on the temperature carried through the water main.
Cold welding method
This method of connecting the elements of the highway is suitable only for cold water under slight pressure. The mating surfaces are degreased. A special glue is applied, sold in hardware stores, the elements are joined and fixed for thirty seconds. The plumbing will be ready for use in just an hour. This method is not reliable and does not create a monolithic connection of parts.
Polypropylene pipes are a good alternative to classic, steel or cast iron pipes. Installation of water and heat supply with their help is simple, not time-consuming and cheap. Therefore, these products have taken their great and rightful place in their segment of the construction market.
July 29, 2016
Specialization: facade finishing, interior finishing, construction of dachas, garages. The experience of an amateur gardener and horticulturist. He also has experience repairing cars and motorcycles. Hobbies: playing the guitar and much more, for which there is not enough time :)
At first glance, there is nothing complicated in welding polypropylene pipes - the parts need to be heated to melt the plastic, and then connected. However, in reality, this operation contains a number of nuances on which the quality of the result depends. Therefore, next I will tell you how to properly solder polypropylene pipes, and we will also look at the most common mistakes that novice craftsmen make.
Pipe welding technology
Tools
Many owners of houses and apartments who are faced with the replacement of a pipeline are interested in how and how to solder polypropylene pipes themselves. After all, it is this type of "plastic" that has recently become the most common.
Before starting this work, you need to prepare the following tools:
Procedure
So, the instructions for soldering pipes are as follows:
- First of all, you need to insert nozzles into the soldering iron and then turn it on. The device should warm up to operating temperature, then turn off and turn on again. Light indicators allow you to monitor the operation of the device;
- while the soldering iron is heating up, you can prepare the pipe. To do this, its end must be inserted into a special device and the last turn. If the pipe is single-layer, then this operation is not necessary;
- the next stage is the most important - the fitting and the pipe connected to it must be inserted into the nozzles. The most important thing is to correctly position the pipes so that there are no distortions and withstand a strictly defined time. The latter depends on the pipes and the apparatus itself.
Therefore, each device comes with a table that indicates the heating time for pipes of different diameters. As a rule, for pipes with a diameter of 25 mm, the time is 9-10 seconds. Pipes with a diameter of 32 mm warm up in 10-12 seconds.
If, before soldering pipes made of polypropylene, they are overexposed more than necessary, they will deform or sagging will appear on the inner walls, which will reduce the pipeline's permeability;
- after the time indicated in the table, you need to pull the parts out of the nozzles and connect them to each other. At the same time, it is important not to displace them relative to each other and wait until the plastic hardens.
If the device has a knob for setting the temperature, it should be set to 260 degrees.
This completes the joining process. According to this scheme, all the details of the pipeline are connected. Of course, before you start making it, you should practice on scraps and “fill your hand” a little.
Common Newbie Mistakes
Below we will take a closer look at these errors and how to avoid them.
Connection deformation
A professional installer, before soldering polypropylene pipes, will definitely wipe them. Moreover, it is necessary to pay attention to the cleanliness of the floor, since the parts to be connected are usually placed on the floor.
In most cases, when dismantling a poorly welded fitting, you can even see a strip of dirt. Also fatal for the connection is the presence of moisture. Even a few drops of water evaporate during the heating process, as a result of which it loses strength and deforms.
In the photo - the consequence of improper soldering
To remove moisture from the pipe, you need to pour salt into it. At the end of the work, the pipeline, of course, must be flushed.
The most unpleasant thing about such errors is that the connection can remain strong for some time and even undergo pressure testing. However, after some time, a leak will definitely appear in this place. Sometimes such flaws manifest themselves even after a year.
Therefore, when starting work, first of all, you need to monitor cleanliness. Moreover, even the nozzles should be clean. From their surface it is necessary to remove the remains of polypropylene and other debris.
Wrong positioning
The main difficulty in welding lies in the rapid extraction of parts from the nozzles and connecting them to each other. This operation must be completed in a few seconds, but in general - the faster the better.
If you exceed the time limit, the strength of the connection will decrease. To avoid this mistake, you need, as mentioned above, just "fill your hand."
Also, novice craftsmen, immediately after connecting the parts, often try to remove the streaks. This can only be done after the connection has cooled down. Although, of course, it is better to prevent the formation of slush, i.e. do not overexpose parts in nozzles.
Incorrectly selected materials
First of all, it should be said that the price of pipes should not be a fundamental factor in their choice. If low-quality materials are purchased, then even the most skilled craftsman will not be able to guarantee you the strength and durability of the connections.
Another common mistake is to combine parts from different manufacturers. The fact is that the chemical composition of polypropylene they may vary slightly. Accordingly, when heated, they can behave differently.
Violation of installation rules
Often the cause of poor welding is a banal violation of the rules of installation or carelessness of the mater. Such errors include:
- the pipe is not completely inserted into the fitting - this leads to the fact that a place appears with a wider diameter and a thinner wall than planned;
- too much pressing of the pipe into the fitting, resulting in deformation;
- soldering the fitting end-to-end - as a rule, craftsmen resort to this method if the fitting has deteriorated and there was no other at hand.
Thus, the key to the quality of soldering is accuracy and strict adherence to technology. Only in this case the pipeline will be able to serve for many years.
Here, in fact, are all the nuances of soldering polypropylene pipes, which I wanted to acquaint you with.
Recently, traditional cast iron and steel pipelines are increasingly being replaced by more modern products of the chemical industry - PVC and polypropylene pipes. But new materials require a different technology for connecting pipes, and brazing is the most effective in this case.
Note! The soldering temperature, which affects the quality of the connection, depends on the dimensions of the products - this can be seen in the table below.
| Polypropylene pipes, marking | Characteristics and purpose |
|---|---|
| PN 10 | technical characteristics are acceptable for cold water supply up to 20 degrees Celsius, warm system floors up to 45 degrees, at an operating pressure of 1 MPa |
| PN 16 | characteristics determine the use for both hot (up to 60 degrees Celsius) and cold water supply, nominal working pressure - 1.6 MPa |
| PN 20 | technical characteristics of this type of pipes allow the use in hot water systems with temperatures up to 95 degrees, nominal pressure - 2 MPa |
| PN 25 | reinforced polypropylene pipe: characteristics are suitable for hot water supply, as well as for central heating systems up to 95 degrees Celsius, nominal pressure - 2.5 MPa |
Step 1. The choice of one or another source material directly depends on the future destination. The main criterion for division is the maximum allowable temperature of the working medium. In this regard, pipes are distinguished for hot, cold, as well as mixed water supply.
To determine the exact number of pipes and fittings needed, the room is measured and a rough plan is drawn up. The latter indicates the dimensions of the future highway and all its elements.
After purchasing all the components, you can proceed to the next step.
Stage 2. Necessary equipment
The principle of soldering is to heat the ends of the pipes to be connected to the required temperature and then fix them. To do this, you need a special device - a welding machine.
It can be of three types:
In addition to the device itself, the work will require:
About the choice of nozzles
The heating nozzles must correspond to the cross-section of the connected pipes. To do this, you need to pay attention to certain parameters:
- strength;
- shape retention during temperature changes;
- thermal conductivity.
Most welding machines are compatible with several different nozzles at once, which is extremely convenient when arranging complex highways.
Each nozzle has two ends at once - one is intended for heating the outer surface of the products, the other for the inner one. All nozzles are coated with Teflon, which prevents sticking of the molten coating. The dimensions of the nozzles vary between 2 cm and 6 cm, which completely coincides with the common and pipe sections.
When the plan is drawn up, and all the components are purchased, it remains only to carefully clean the room. Particular attention should be paid to dust, because even the smallest particles, settling on the seams, can easily break the tightness.
First, the nozzle is inserted into the socket, after which the device is turned on. Further actions depend on the chosen soldering technique, so we will consider them (methods) in more detail.
Method number 1. Diffusion soldering
When using this welding technology, the material of the parts to be joined mutually penetrates each other, and after cooling it forms a monolithic element. One of the most common processing methods, which, however, is only suitable for homogeneous materials.
Note! In this case, the soldering temperature reaches 265ᵒС. It is at this temperature that polypropylene melts.
Video - Diffusion brazing of PP pipes
Method number 2. Socket soldering
When welding in a socket way, welding machines with different nozzle cross-sections are used. The procedure itself looks quite simple.
Step 1. First, pipe sections of the required length are cut. It is important that the cutting takes place exclusively at right angles.
Step 2. The ends of the products are cleaned with a shaver (if reinforced pipes are used).
Step 3. The ends are inserted into the nozzle of the appropriate section, heated to the melting temperature and connected.
Note! It is extremely important that the pipes do not change their position when cooling.
Method number 3. Butt soldering
This method is useful when connecting pipes of large diameter. As in the previous versions, the pipes are cut into sections of the required length, and the ends are carefully cleaned.
Method number 3. Sleeve soldering
With the coupling method of welding, an additional part is introduced between the elements to be connected - a coupling. Warming up occurs in the same way, only the sections of the highway are not heated, but only the connection elements.
Method number 4. Polyfusion soldering
A kind of diffuse technology, characterized in that only one of the two connected elements is melted.
Method number 5. "Cold" soldering of PP pipes
This welding method involves applying a special adhesive to the pipes to be joined. It is characteristic that the use of "cold" welding is permissible only in those lines in which the pressure of the working fluid is negligible.
When overheating or connecting pipes of small diameter, there is a risk of formation of sagging on the inner surface. These influxes will prevent the free movement of the working fluid during operation.
To avoid this, it is necessary to check the connection for such defective areas. The junction must be blown through, and if the air passes unhindered, then the welding definitely turned out to be of very high quality.
Note! After that, it is necessary to check the tightness of the connection - for this, a small amount of water is passed through the soldered elements.
Important Rules for Soldering Polypropylene
For a high-quality and tight connection, certain rules must be followed.
Soldering PP pipes in difficult areas
To the question, what is the main problem in the arrangement of a plastic pipeline, any specialist will answer: soldering in hard-to-reach places. To perform this procedure, the structure is divided into several sections.
First of all, an uncomfortable large area is mounted. It is advisable to form it separately, and only then install it in a stationary place.
After fixing the problem area, smaller and, accordingly, easy-to-install elements are installed. This activity should be done by at least two people.
Video - Installation in hard-to-reach places
Typical mistakes when soldering plastic pipes
Video - Technology for soldering PP pipes
Results
Skills in soldering PP pipes will come with time. There is nothing complicated here, although at first several couplings and one or two dozen meters of pipes will be damaged. And this is not scary, because they are not so expensive; at least autonomy from plumbers is more expensive.