How to solder a HDPE pipe with a polypropylene pipe. Connecting HDPE pipes with fittings - features of the work. Execution of detachable connections

Often there are cases when, when manufacturing a pipeline, one has to face the problem of connecting pipes from various materials. In this article, we will look at how to connect an HDPE pipe to polypropylene pipe.

Types of connection of a polypropylene pipe

To connect a polypropylene pipe with other types of pipes, there are special threaded fittings. One side of the fitting is welded to a polypropylene pipe, and the second side, with a thread, is connected to the threads on the other pipe to the same diameter. The thread on the fitting may be internal or external. In addition, there are combined couplings. We will consider them later.

Another type of polypropylene pipe connection is based on a flange connection. This type of connection is used in pipes of enormous size. For mounting flange on poly propylene pipe a sleeve is welded onto which a flange is later put on. Another mounting option is carried out with cap flanges. Their device resembles a compression clutch. The flange connection is attached to the edges of a pipe of the same diameter, and tightened with union nuts.

Types of connection HDPE pipes

The HDPE pipe has approximately the same connection devices. The most popular is the collet connection. To connect pipes, a coupling is used, in which there is a collet on one side and a thread on the other. To fasten the coupling, the clamping nut is unscrewed and put on the HDPE pipe. The collet is inserted into the pipe, the clamping nut is put on and tightened well.

Advice! The clamping nut must not be tightly clamped, otherwise it may burst or the collet will crush the edge of the pipe.

After the connection of the collet is completed, it is possible to wind another threaded pipe to the other end of the threaded coupling in order to have the same diameter.

The flange connection of HDPE pipes is performed similarly to the connection outlined above. A sleeve is welded to the edge of the HDPE pipe, onto which the flange is attached. And the same device with a union flange, where the connection is installed on the edges of the pipes and pressed with union nuts.

Connection of two pipes

Using the pipe fittings discussed above, it is possible to easily connect a HDPE pipe to a polypropylene pipe.

• In the first case, you attach a threaded collet to the HDPE pipe, and a combined threaded coupling to the propylene pipe. Wrap the FUM tape for sealing on the thread and twist them.
• In the second case, you connect two pipes with flanges. Insert between flanges for sealing rubber gasket and tighten them with bolts.

Combined couplings

If it is clear with a collet connection for HDPE pipes, then combined couplings (fittings) for polypropylene pipes are diverse. Let's take a look at them briefly:

1. Coupling with internal thread helps to connect the pipeline with another type of pipe or devices that have an external thread. It consists of a polypropylene blank with an iron sleeve pressed inward, on which a thread is cut.
2. The male threaded coupling performs the same functions as discussed above. It differs only in that a metal sleeve with an external thread is pressed into the polypropylene blank.
3. A socket with a turnkey internal thread is made up of a polypropylene blank, into which an iron bushing is pressed, supporting the edge of the polypropylene with iron edges. The edges are calculated under the open-end wrench. The edge is carved. It is convenient to wind such a sleeve with a key onto another thread. In addition, there are models of couplings with turnkey edges.
4. Wrench Male Coupling - The same as the coupling outlined in step 3, only it has male threads.
5. A split coupling with an internal thread consists of two iron parts for an open-end wrench. Moreover, one iron part is connected to a polypropylene blank. Such couplings are installed in places where it is necessary to disconnect the pipeline or remove devices. Another name for this clutch is American. It spins with two keys.
6. The detachable coupling with external thread is similar to the previous view of the American. The only difference is external thread instead of internal.
7. A coupling with a cap nut is made up of a polypropylene blank, into which a fitting with a turnkey cap nut is pressed. It is installed in the same way as an American: in the places of the desired pipeline connector.

With such combined couplings, soldered to a polypropylene pipe, it is easy to connect to a HDPE pipe, which has a collet with a similar thread.

Soldering PP fittings

Before connecting two pipes with fittings, they must be fixed to the pipe. We discussed the fastening of the collet on the HDPE pipe above. Now consider the connection of a polypropylene pipe with a fitting.

Polypropylene fittings it is connected to the pipe by soldering with a special soldering iron. The soldering iron with nozzles is installed on a stand and heated to 260 ° C. The edge of the pipe is cleaned of dirt, chamfered and degreased along with inside couplings. the fitting and the Pipe are put on the heated nozzles at the same time. At the end of the heating, the pipe is inserted into the fitting exactly without turning and allowed to cool. This completes the soldering process.

After reading this article, you will easily connect a polypropylene pipe to a HDPE pipe. Here are all the possible options for the correct connection. There are enthusiasts who claim on construction forums that it is possible to solder these two pipes with a coupling at different temperatures. But the thing is that polypropylene and HDPE are made up of different materials, they have different melting points, based on this, such a seam can burst either by and large melt. If you decide to save money and experiment, you do so at your own risk.

The difference in the structure of polypropylene and metal plastic pipes and differing installation technologies can create difficulties when joining two pipelines in single system water supply or heating.

However, material manufacturers have long developed ways to join materials of different structures, despite the fact that they have various features installation.

Connections of pipeline systems from different materials may be necessary if:

• connecting a new pipeline to an existing line or riser;
• replacement of the worn area;
• installation and connection of water heated floors to the current system heating from polypropylene;
• installation mixed system in order to reduce the cost of purchasing materials.

In each case, you will need parts with the same type of connection on one side (fittings).

Types of fittings for connecting metal-plastic and polypropylene

Fittings are called elements of pipeline systems designed to connect pipeline sections, branch flows and join plumbing equipment.

The use of fittings for the installation of pipes made of metal-plastic and polypropylene depends on the features that each material has.

Features of mounting products made of polypropylene

The connection of PPR pipes is carried out using diffusion welding (soldering) technology using coupling parts.

When mounting with special tool heating occurs outer surface pipeline and inner surface fitting until the melting point starts at 240-260˚C, after which the coupling joint is docked.

For polypropylene, this is:

• made entirely of plastic corners, tees, crosses, couplings, flanges, compensators and contours;
• angles, tees, couplings and detachable connections having external or internal threads on one side.

Today, one of the leaders in the pipe market is products from polymer materials. Polyethylene pipelines have significant advantages over products of the same purpose. These pipes are more in demand than steel and brass, copper and galvanized, PVC and metal-plastic. HDPE pipes are used to transport liquids of a wide variety of compositions. They are lightweight, flexible and easy to install. In addition, they can be connected to each other in pipelines using many available methods. In this article we will talk about how to connect the HDPE pipe.

Methods for connecting HDPE pipes

The connection of HDPE pipes is practically performed in two ways. The first way can be divided into:

• butt welding;
• electrofusion welding.

The second method provides:

• coupling connection;
• compression fitting.

Note! When equipping gravity pipelines, a detachable connection is widely used, since work on its installation is carried out relatively quickly and simply. If the pipeline is designed to work under pressure, a welded connection is recommended.

Execution of detachable connections

Since sewer pipelines are non-pressure, lower requirements are imposed on their connections compared to water pipes. They are divided into:

• socket connections, in which the smooth end of one pipeline is inserted into the socket of another structural element. The tightness of the connection is ensured by silicone or rubber cuffs with elastic properties;
• fitting connections that ensure the connection of two ends of pipelines with a special shaped piece called a fitting.

Polyethylene couplings using the extrusion method are widely used in the installation of pipelines. Couplings can be used quickly, reliably and without extra equipment connect the ends of the pipelines.

This connection method has the following advantages:

• high resistance to mechanical influences and temperature extremes;
• reliability of connecting fastening and durability of pipelines;
• wide scope of use. This connecting type is used in the equipment of pipelines for virtually the most diverse purposes;
• low cost of polyethylene fittings.

For the installation of pipelines, the following coupling varieties are used:

• Compression couplings, which are available with internal and external threads. Such connecting elements are used in the installation of water and gas supply systems.
• Couplings, which are the simplest, connect the ends of pipelines with the same diameters.
• Reducing couplings, which are transitional when fastening pipeline elements with different diameters.

Connect with compression fittings polyethylene pipes pretty easy. Such fastening is carried out in the following order:

• The fitting is disassembled with the union nut unscrewed.
• The end of the pipe is being prepared for the connection, namely: pollution is removed, a chamfer is removed along the diameter, for which a chamfer or a sharp construction knife is used.
• On the pipe mark the mark of the depth of the pipe entry into the fitting.
• Before driving the pipe into the fitting, to facilitate this work, it is rubbed with silicone grease or ordinary wet soap.
• After the pipe has been forced into the fitting to the desired depth, the union nut is tightened back.

Note! The nut must only be tightened by hand, as when using wrench you can overdo it.

Execution of permanent connections

During installation pressure pipelines the most acceptable are welded joints of one-piece type. They are easy to install and no special skills are required for this operation.

Now let's talk about connecting HDPE pipes using butt welding. To do this, you need to purchase a special soldering iron used in working with polymer pipes. Since it costs little money, significant financial costs are not required - professional craftsmen will cost significantly more. Work is performed in the following order:

• in the clamping legs of the welding machine, the ends of the pipelines to be welded are fixed and alignment is carried out;
• surfaces are heated to initial melting;
• the soldering iron is removed, and the melted surfaces are compressed together;
• then there is a natural cooling of the formed seam.

Electrofusion welding

This method is not much more complicated than the previous one, but requires the use of special couplings with inserted electric spirals, which heat up the element when voltage is applied. As a result, the connection elements are welded to the coupling surface. For the welding process to go smoothly, you need:

• pre-clean the ends of the pipes to be welded,
• ensure the static state of the connection parts during welding.

The advantage of this connection method is the simplicity of the work performed. A noticeable minus is the high cost of electrical couplings. If planned a large number of connections, it is better to use contact welding.

Connection with metal pipes

To connect pipes made of polyethylene and metal, two connection methods are used:

• Threaded connections for pipes with small diameters. In this case, you need to buy fittings special purpose, which, on the one hand, must have a cut thread for joining with a metal pipe, on the other, a coupling of ideal smoothness for fastening with a HDPE pipe.
• Flange connection for pipes with a large diameter. In this case, shoulder bushings are welded to polyethylene pipes, which make it possible to use an additional flange on its surface, which is pulled together with the flange of a metal pipe using studs and nuts.

In order to select the desired connection, you need to compare all the pros and cons of each, watch a video on how HDPE pipes are connected, make a test attempt, and you can proceed to the main work.

Video

From this video you will learn how to install a compression coupling:

Often there are cases when, when manufacturing a pipeline, one has to face the problem of connecting pipes from different materials. In this article, we will look at how to connect a HDPE pipe to a polypropylene pipe.

Types of connection of a polypropylene pipe

To connect a polypropylene pipe with other types of pipes, there are special threaded fittings. One side of the fitting is welded to a polypropylene pipe, and the second side, with a thread, is connected to a thread of the same diameter on another pipe. The thread on the fitting can be internal or external. Also there are combined couplings. We will consider them later.

Another type of polypropylene pipe connection is based on a flange connection. This type of connection is used in pipes big size. To mount the flange on a polypropylene pipe, a sleeve is welded, on which the flange is then put on. Another mounting option is carried out with cap flanges. Their device resembles a compression clutch. The flange connection is attached to the edges of the pipe of the same diameter, and tightened with union nuts.

Types of connection HDPE pipes

The HDPE pipe has approximately the same connection devices. The most common is a push-in connection. To connect pipes, a coupling is used, in which there is a collet on one side and a thread on the other. To fasten the coupling, the clamping nut is unscrewed and put on the HDPE pipe. The collet is inserted into the pipe, the clamping nut is put on and tightly tightened.

Note! The clamping nut must not be clamped very hard, otherwise it may burst or the collet will crush the edge of the pipe.

After connecting the collet to the other end of the threaded coupling, you can wind another pipe with a thread of the same diameter.

Flange connection of HDPE pipes is carried out similarly to the connection described above. A sleeve is welded to the edge of the HDPE pipe, onto which the flange is attached. And the same device with a union flange, where the connection is installed on the edges of the pipes and pressed with union nuts.

Connection of two pipes

Using the pipe fittings discussed above, you can easily connect a HDPE pipe to a polypropylene pipe.

• In the first case, you attach a threaded collet to the HDPE pipe, and a combined threaded coupling to the propylene pipe. Wrap the FUM tape for sealing on the thread and twist them.
• In the second case, you connect two pipes with flanges. Insert a rubber gasket between the flanges for sealing and tighten them with bolts.

Combined couplings

If everything is clear with a collet connection for HDPE pipes, then combined couplings (fittings) for polypropylene pipes are diverse. Let's take a look at them briefly:

1. A coupling with an internal thread is used to connect a pipeline to another type of pipe or devices that have an external thread. It consists of a polypropylene blank with a metal sleeve pressed inside, on which a thread is cut inside.
2. The coupling with an external thread performs the same functions as discussed above. It differs only in that a metal sleeve with an external thread is pressed into the polypropylene blank.
3. A socket with a turnkey internal thread consists of a polypropylene blank, into which a metal sleeve is pressed, protruding beyond the edge of the polypropylene with metal edges. The edges are designed for open-end wrench. A thread is cut inside the face. It is convenient to wind such a sleeve with a key on another thread. There are also models of couplings with turnkey edges.
4. Wrench Male Coupling - The same as the coupling described in point 3, only it has an external thread.
5. The split coupling with an internal thread consists of two metal parts for an open-end wrench. Moreover, one metal part is connected to a polypropylene blank. Such couplings are installed in places where it is necessary to disconnect the pipeline or remove devices. Another name for this clutch is American. It spins with two keys.
6. A split coupling with an external thread is similar to the previous type of American. The only difference is in the external thread instead of the internal one.
7. The coupling with union nut consists of a polypropylene blank into which a fitting with a turnkey union nut is pressed. It is installed in the same way as the American: in the places of the required pipeline connector.

With such combined couplings, soldered to a polypropylene pipe, it is easy to connect to a HDPE pipe, which has a collet with a similar thread.

Soldering PP fittings

Before connecting two pipes with fittings, they must be fixed to the pipe. We discussed the fastening of the collet on the HDPE pipe above. Now consider the connection of a polypropylene pipe with a fitting.

Polypropylene fittings with a pipe are connected by soldering with a special soldering iron. The soldering iron with nozzles is installed on a stand and heated to 260 ° C. The edge of the pipe is cleaned of dirt, chamfered and degreased along with the inside of the coupling. The pipe and fitting are simultaneously put on heated nozzles. After heating, the pipe is inserted into the fitting exactly without turning and allowed to cool. This completes the soldering process.

After reading this article, you can easily connect a polypropylene pipe to a HDPE pipe. Here are all possible options correct connection. There are enthusiasts who claim on construction forums that these two pipes can be soldered with a coupling at different temperatures. But the thing is that polypropylene and HDPE consist of different materials, they have different melting points, so such a seam can burst or even melt. If you decide to save money and experiment, then do it at your own peril and risk.

Video

One example of how to replace a section of an iron pipe with a polypropylene one. By the same principle, you can connect plastic pipes from various materials:

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Installation of a polypropylene pipeline is so simple that you can easily carry it out even in between watching your favorite TV shows or series. The main thing is to stick to some general rules and understand the basic principles of joining plastic pipes. I will tell you all this from my own experience.

Installation work

Starting to work with polypropylene pipes, I first of all remembered their main qualities:

• The low price allowed me, without much abuse of family budget purchase all necessary plastic products, including connecting fittings, with some margin. After all, even with the appropriate experience, no one is immune from making mistakes, and it is better to have replacement parts at hand in case of an unsuccessful operation, and not run after them to the store, leaving an unfinished pipeline and an unfinished series;

• A simple connection instruction including "hot" and "cold" methods. But simplicity does not preclude the need for the presence of a special tool for each of the options. In what follows, I will describe both of them in detail, since different areas I used both soldering and compression fittings. It’s better for you to make a choice in advance in order to take care of the availability of appropriate equipment. You can do it right after reading the article;
• No corrosive processes. plastic surface is not subject to either internal corrosion, which can be provoked by the transported liquid, or external, which usually occurs after laying the pipeline in the ground. Thus, when laying underground water supply, I knew that it would last for decades, but only taking into account the quality and absolute connections.

If you plan to use polypropylene pipes for installing a heating system, then I recommend purchasing reinforced samples that can withstand high temperatures, which will eliminate the risk of an emergency.

Based on the foregoing, I purchased materials with a margin, took out the right tools and prepared to make quality connections that can be left unattended for years to come.

hot method

Where I planned to lower the water supply line underground, I had no doubts about the choice of the connection method: only soldering. The melting point of propylene is only 260 degrees Celsius, and after solidification are formed fully sealed seams. In addition, the process itself is quite fast. The impossibility of dismantling me in this case did not bother me at all.

When laying pipelines indoors, welding is also excellent. The only exceptions may be those areas where disassembly of pipes is required, or a situation in which it is not at all possible to get a pipe soldering iron.

If you have a one-time installation planned, then not cheap welding machine for plastic pipes it is not necessary to purchase, it would be more rational to rent it.

Before connecting polypropylene pipes using the “hot” method, in addition to the “iron”, I also prepared the following tools:

Now I will describe to you in detail how polypropylene pipes are connected, you really will have time to install small sections during the period of scrolling commercials on TV:

If this is your first time trying to solder plastic pipes, then I recommend that you first practice on a couple of products that will not be included in the system being installed.
So you "fill your hand" and can avoid typical mistakes when performing "finishing" work.

1. Training:

• I took out a soldering iron from a suitcase where he was, and placed it on a level and stable oak table. You can put the device on the floor or on asphalt, as long as it has a secure position, because you have to deal with high temperatures;

• Then inserted nozzles corresponding to the diameters of the elements to be soldered. At the same time, a product is installed under the pipe in the form of a kind of “bowl”, which wraps around its edge with outside, and under the tubular element that enters it and performs melting from the inside;

• Turned on the device. If your device has a power regulator, then set it to 260-270 degrees Celsius. If this is not the case, then the unit will automatically heat up to the specified temperature;

1. Markup. Here I have already moved on to work with the pipes themselves. With a tape measure and a pencil marked out the necessary segments for the formation of the pipeline. In addition, measured the depth heating elements and, adding a couple of millimeters, applied it to the soldering points. This can be done after cutting products. This technique will help you control the immersion of the edge of the cut into the nozzle, since excessive melting can lead to the formation of a bulge in the seam that prevents the passage of liquid;

1. Cutting. The main thing here is to observe a right angle. Thanks to some experience, I have no problems with this, that is, evenly brought the scissors to the line and made a clear cut with one smooth strong movement. Try also, without excitement, with the necessary efforts to complete the cutting. Otherwise, if you make oblique cuts, you will have to level them with a hacksaw or knife. It is also worth noting that when using reinforced pipes, you must first remove the upper layer plastic and foil laid under it;

1. Heat. At this stage I I put the prepared coupling on the mandrel, and inserted the pipe section with some delay into the nozzle-sleeve. Why belatedly? Because the walls of the connecting element are thicker, and, accordingly, they will melt longer, that is, the head start will not interfere with them. Keep the products in this position should be guided by the following table:

1. Docking. After the above time has passed, I removed both fragments with melted edges from the welder and connected, again, strictly at a right angle, after which he held the time indicated in the following table:

In no case do not rotate the connected products at the time of solidification, as this may provoke a violation of the tightness of the seam.

1. The control. I let water through the finished pipeline and checked all joints for leaks. If you suddenly find one in yourself, then cut out the problem area and weld a new segment in its place.

cold method

Compression fittings allow you to connect polypropylene pipes without soldering. All you need besides the connectors themselves is crimp key, which, as a rule, is sold with them.

The very process of connecting pipes in a “cold” way, I performed as follows, when I didn’t have an “iron” at hand, and it was necessary to restore the damaged section of the water supply urgently:

1. Measured and cut off the desired pipe fragment;

1. Calibrated hole. It is very important that its cross section ideally matches the diameter of the fitting tail;

1. Put on the edge of the pipe ferrule;

1. Then I inserted the fitting itself inside;

1. Crimped the clutch special key, securely fixing it on the pipe;

1. I checked the coupling for the presence of characteristic recesses, indicating a quality connection.

The described method also solves well the problem of how to connect metal pipe with polypropylene. To do this, simply select the appropriate compression fitting, in which one of the ends is equipped with a metal thread the right step and diameter.

If you have a question: "How to connect a HDPE pipe with polypropylene?" Then again, you can turn to compression fittings, since welding here, most likely, will not cope due to the significant difference in the melting temperatures of these materials. At least I wouldn't risk it.

And a bit of "tar in the ointment": despite some versatility of the "cold" connection method, it takes much more time to implement. So, if you have to install a long pipeline, then during the time of advertising on TV you may not have time to cope with the task.

Conclusion

A little practice and following the above recommendations will allow you to lay water supply lines from polypropylene pipes, practically without looking up from watching your favorite TV shows and TV programs. The main thing is to be careful and accurate, since a mistake made will take much more time to correct it than timely control of the work being done.

The video in this article will allow you to familiarize yourself with some of the additional information, which is close in content to the material presented. If you have any additional questions on the topic, ask them in the comments.

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