Do-it-yourself connection of HDPE pipes with fittings. The subtleties of fitting fittings and methods of connecting HDPE pipes. Key features of pipes

Today, one of the leaders in the pipe market is products made of polymeric 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. With the help of coupling connections, it is possible to quickly, reliably and without unnecessary equipment connect the ends of 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.

With the help of compression fittings, connecting polyethylene pipes is quite 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! Be sure to tighten the nut only by hand, as when using a wrench, you can overdo it.

Execution of permanent connections

When installing pressure pipelines, one-piece welded joints are the most acceptable. 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 will not be required - professional craftsmen will cost much 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 that 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 a large number of joints are planned, then it is better to use resistance 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 special-purpose fittings, which, on the one hand, must have a threaded thread for joining with a metal pipe, and on the other, a coupling of perfect 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:

Polymer pipes are often used both in industry and in the installation of plumbing systems in private construction. Their popularity is due to the ease of installation and low price of products. The reason for such a low cost is the limitation of the operating temperature of HDPE pipes to 65 degrees. Nevertheless, the supply of both cold and hot water to a house or apartment is almost always carried out with their help, so the connection of such pipes is a rather relevant issue.

Peculiarities

In addition to the installation of pipelines, the operational properties of HDPE pipes are reflected in the following areas of application:

• protection of electrical cables and cable communication systems laid in the soil from corrosion;
• formation of a waterproofing layer for various materials - concrete, metal, wood;
• installation of irrigation and sewage systems, as well as gas supply.

Their high popularity is also due to the fact that pipe sections can be connected to each other in several ways, which makes them almost universal.

Kinds

There are several classifications of such connecting elements for HDPE systems. The main one is the classification according to the method of their installation. All connections of HDPE products can be divided into two types: one-piece and detachable.

Permanent connections can be created with or without a fitting. However, a connection without an additional element is less reliable and durable, so it is practically not used.

One-piece

Such joints are used quite rarely and are performed using special welding, performed either as a conventional butt joint, or using an electric coupling. In the first case, with the help of professional welding equipment, the ends of the cut products are heated to a soft plastic state, after which they are pressed against each other and cool in this position until hardening. Such a connection will be strong only if the sections of the two pipes to be connected are not oval, but round in cross section.

To work with an electric clutch, you will also need special equipment that will heat the spiral located in it. Cut pieces of pipes are inserted into both outlets of the coupling, the spiral heats up and melts their connected edges. After the spiral has cooled, the heating apparatus is disconnected from the coupling, and it is left as a connecting element that protects the seam.

Thus, welding of HDPE products can be done end-to-end, socket welding with a fitting, using a press (edge ​​welding) and using electric couplings.

Detachable

Most often, detachable fasteners are used to connect HDPE products. This is done by the method of socket alignment with the help of elastic polymer seals. This method can only be used in non-pressure pipeline systems.

For pipes in which water is supplied under pressure, various fittings are an ideal connection method. Their use increases the life of the entire system, its reliability and resistance to temperature extremes. Fittings are universal and resistant to various aggressive environments. They are used both for connecting hoses with the same internal diameters, and for different-caliber products.

The connection itself can be different.

• Flanged. In this case, the brass flange or cast flange is welded to the pipe. Most often, pipes of different materials or wide highways are connected in this way.
• Bell-shaped when one end of the pipe enters a fitting extension on the other pipe. Systems correctly connected in this way are the most reliable and resistant to pressure.
• Threaded. With such a connection, threads are threaded on pipes and fittings in advance with a special tool. Only systems with low pressure can be connected in this way, as this is not a very reliable method.

Depending on the rigidity of the material, there are flexible and inflexible connections made of metal (brass, steel, cast iron and copper) or polymers (polypropylene, plastic, polyethylene and PVC). According to the diameter of the hose, the method of fastening is divided into connecting pipes of the same size and different ones.

In addition to the connection method, accessories for HDPE pipes are divided into the following types.

• Welded. Such elements for HDPE systems are produced either by casting (molded fittings) or by conventional welding of short pieces of pipe (welded fittings). Such welding is called butt welding. The diameter of the elements ranges from 63 to 315 mm.
• Electrowelded. In essence, such fittings are just thermistor couplings used where it is impossible to organize conventional welded joints or they are not reliable enough. One of the features of such electric welded elements is the possibility of carrying out work without moving the pipe and creating separate tie-ins into the system. With their help, you can connect hoses of different diameters, as fittings are available in many different diameters. They are available not only in the form of conventional couplings, but also in the form of tees, bends and plugs, both with small diameters of 20, 25, 32 mm, and for large systems with diameters of 800, 900 and 1200 mm.

This type of product has a wide application and is used for mounting any branches and plugs that exist. Most often they are installed in gas supply systems or for liquids with a highest temperature of 40 degrees.

• Compression (crimp). Such detachable fasteners are produced for combining pipes without the use of welding. Compression elements consist of a polyethylene rigid or flexible body with sealing rings at the ends, clamping connections, a pressing sleeve and cap nuts. The dimensions of such fittings start from just 16 mm, and end with a standard riser line diameter of 110 mm. Usually, when installing water supply and sewerage, fittings with a diameter of 50 mm are used, since inlet and outlet pipes of this particular diameter are installed in most houses and apartments.

In addition to all of the above classifications, the fittings themselves are divided into several types, depending on what role they play in the water supply or sewerage system.

• Plugs - for permanent or temporary closing of the path to the flow of water and gas.
• Clamps crimp and fix the pipe.
• Tees or crosses - for arranging branches from the main pipeline and connecting additional devices.
• Couplings - elements of connection of two segments.
• Adapters - for assembling pipes from different materials into one system, for example, HDPE with metal.
• Elbows are needed for angular rotation of pipes and changing their direction. Standard elbows are available in 45, 56 and 90 degree angles and can be made to order if a different degree of bend is needed.
• Saddles are used to create branches.
• Overlays cut new pipes into the previously installed system.

Mounting

Of all the types of connection of polyethylene parts for installation on their own, compression fittings are most often chosen. The choice of this type of components is associated with the lack of expensive equipment for their installation. You just need to connect all the details of such a mount with your bare hands.

The installation process itself is as follows.

• Pipe cutting. The polyethylene pipe is cut with special scissors at a right angle. The edge must be free of all burrs and rounded off. A special mark is applied to the surface of the pipe, which shows how deep the pipe must be inserted into the socket of the fitting.
• Mounting disassembly. Before inserting the pipe ends into the polymer connector, loosen and remove their plastic caps. Putting the assembled fitting on the end of the pipe is strictly prohibited, as the parts will not be connected correctly and there is a high risk of leaks.
• Compound. The end of the pipe is lubricated with ordinary soap or wetted with water, a nut removed from the fitting is put on it. A pressing sleeve is placed on the pipe. The white clamping ring is installed so that its thick part is directed to the pipe, and the rubber ring can either be placed in a special recess of the fitting or put on the pipe itself.

The pipe is inserted into the fitting body, the ring and sleeve are moved close to it. The clamping nut is first tightened by hand, and then tightened with a special tool. After installing all connections, it is necessary to check the system by supplying water to it under the maximum permitted pressure.

Installing a water supply system using HDPE pipes is quite simple, even beginners can assemble a simple water supply system on their own.

However, there are some typical mistakes that it is better to know about in advance in order to avoid them.

• Do not buy products from different materials. Water supply hoses can be made from different types of polymers, which will reduce the tightness of their connection. As a result, you can get a crack or leak near the fitting.
• A mistake is both excessively strong tightening of the nut, and its weak fixation. In the first case, you can not only break the thread on the product, but also get a microcrack in the body, which is invisible at first glance. After water is supplied to the system, such a crack will begin to expand, and the fitting body will eventually burst. In the second case, the waterproofing ring will be loosely pressed, and water may seep over the edge of the joint.

In household networks, they usually put the most inexpensive option with manual control. Nevertheless, devices with a gearbox are also widely used, which make it possible to facilitate manual effort when changing the position of the lever. With a line width of 150 mm and above, only mechanical drives are used and they are not manually blocked.

Pipes made of polyethylene are a modern high-tech material that is widely used for the construction of pipelines for transporting various media.

This type of pipe is also popular because the installation of pipelines can be performed by a non-specialist. Consider how HDPE pipes can be connected, and what advantages each installation method has.

Polyethylene pipes are widely used in construction and in everyday life.

For example, these products can be used:

• For the construction of a pipeline for water supply;
• For installation of sewerage systems;
• To protect power cables when laying electrical networks;
• To create waterproofing shells when laying heating mains;
• To protect communication cables;
• For the construction of artesian wells;
• For use as shaping parts in the construction of monolithic buildings.
• To create irrigation systems in greenhouses, etc.

Such a wide application, not least, is due to the ease of installation. Consider the methods of their connection.

Methods used to connect HDPE pipes

All existing ways to connect two polyethylene pipes can be divided into two types.

• One-piece connections, i.e. welding.
• Detachable connections using fittings.

The latter option is used more often, here are its main advantages:

• Saving. There is no need to purchase special equipment for welding or pay for the services of a master.
• Availability. A detachable connection can be made where the use of welding is not possible, for example, under water.
• Speed. This method allows you to connect parts at high speed.

Making a detachable connection of HDPE pipes

Detachable pipe connection can be made in the following ways:

• Socket connection. This method requires elastic seals. Such a connection is most often performed during the construction of a free-flow sewer pipeline.
• Flange and fitting connection using special fasteners.

Use of couplings

In the construction of pipelines, couplings for HDPE pipes are widely used.

This part is an element made of polyethylene. For the manufacture of couplings, the extrusion method is used.

This connection method allows you not to use welding machines, that is, it does not require the purchase of special equipment. Moreover, the couplings for HDPE pipes themselves are quite cheap, so their use saves on construction.

Additional benefits of using couplings:

• Long service life of several decades.
• Fastening reliability.
• High resistance to temperature changes, as well as to mechanical stress.
• Resistance to aggressive environments.
• A wide range of applications, the coupling for HDPE pipes can be used for the construction of a pipeline for almost any purpose.

There are the following types of couplings:

• Compression sleeve. This product is available with both external and internal threads. This product is widely used in the construction of heating and gas supply systems. With the help of this part, steel and polyethylene pipes are joined.
• For quick and reliable connection of parts of the same diameter, a coupling for HDPE pipes is used.
• Reducing clutch necessary to connect pipes with different diameters.

Connecting pipes with compression fittings

The work is carried out according to the following algorithm:

• The compression fitting must be disassembled by unscrewing the union nut.
• The pipe is cleaned of dirt, a chamfer is made at the end.

To chamfer, a beveler should be used, however, in the absence of this tool, you can use a sharp knife.

• A mark is made on the pipe with a marker, which should characterize the depth of entry into the fitting.
• Before introducing the part, the pipe should be moistened with liquid soap.
• The pipe is inserted into the fitting, when performing this action, some effort will have to be applied, since the rubber seal creates resistance.
• The fitting nut is tightened.

When tightening the nut, it is important not to overdo it so as not to overtighten the connection.

Making a permanent connection of HDPE pipes

In some cases, it is more advantageous to use the pipe welding method, that is, the formation of a permanent connection. Consider how to connect HDPE pipes by welding. Currently, two methods are used - butt welding and connection using electric couplings.

Electrofusion welding

This type of welding is carried out using a shaped part (coupling) made of polyethylene, into which electric spirals are inserted. When voltage is applied to the spirals, the pipes heat up, and they are welded to the inner walls of the coupling.

Requirements for the process:

• Preliminary cleaning of pipes;
• The immobility of parts during the period of heating and cooling.

Butt welding

This method of connection is carried out by using a special apparatus in which the edges of the pipes are heated. After heating, the parts to be welded are joined to each other, and when the plastic cools down, a reliable connection will be obtained.

When connecting butt welding, pipes with pronounced ellipticity are not allowed to work.

Requirements for welded joints on polyethylene pipes

• The butt weld cannot be located below the level of the outer surface of the pipe.
• When welding two segments, their displacement relative to each other should not exceed ten percent of the wall thickness of the pipe used.
• The height of the bead on a high-quality weld does not exceed 2.5 mm for pipes with a wall thickness of up to 5 mm, and should be more than 5 mm when using thick-walled pipes (wall thickness 6-20 mm).

findings

The choice of one or another pipe connection method should be carried out taking into account the operating conditions of the pipeline - whether it will be pressurized or not, what medium will be supplied through the pipes, etc. The correct choice of pipe connection method will ensure the reliability of the pipeline system.

Currently, the market leader in pipes are products made using polymeric materials. Significant advantages distinguish HDPE plumbing from products of a similar purpose. These pipes are more in demand compared to brass, copper and galvanized, PVC and metal-plastic. The use of HDPE pipes is possible for a wide variety of liquids. They are lightweight, flexible and easy to install. They can also be connected to a pipeline by any available method.

Flexible polyethylene pipe appeared more than 2 decades ago.

The meaning of the abbreviation HDPE means that the pipes are made of low pressure polyethylene.

Basically, grades such as PE 80 and 100 are used for their manufacture.

The main advantage of such water channels is a flexible material and minimal installation costs. You do not need to have special skills to install such a structure.

HDPE pipes do not corrode, they can be laid without digging special trenches, they are sufficiently resistant to soil displacement, they weigh little, and are resistant to aggressive environmental influences.

The HDPE pipe can be used for laying communication cables both indoors and in the ground. It protects the cable from possible damage during operation. It can also be used to lay a power line. These pipes do an excellent job of protecting communications from mechanical damage, stray current, and also from soil influences.

The service life of such a water supply can exceed fifty years.

For underground laying, the following types of HDPE pipes are used:

• light corrugated HDPE pipe;
• pnd pipe double-walled;
• smooth HDPE pipe;
• smooth-walled rigid pipe;
• heavy corrugated pipe.

Characteristics

The corrugated pipe is reinforced with steel wire, it makes it more durable.

The inner shell of double-walled products can be smooth from LDPE and corrugated from HDPE. Thanks to this design, the pipe has a high ring stiffness and is able to withstand a large load.

The double-wall HDPE pipe has a smooth inner surface, which greatly facilitates the installation work for the cable.

The HDPE pipe can be used during installation work even in severe frosts.

Each product has its own characteristics and has its own diameter.

For example, a pipe HDPE 63 has a greater resistance to bacteria than others.

Another type of pipe - HDPE pipe 110 mm- frost-resistant, does not require additional warming measures.

Pipe HDPE 160 Mounted with polyethylene fittings.

HDPE pipes 32 mainly connected using welding. It should be borne in mind that the HDPE 50 pipe or another in size must be of the same brand.

Separate sections of the hydraulic line can be articulated in 2 ways:

• sectional;
• one-piece.

One-piece connection method more often used if it is planned to supply water to it under pressure.

Fragments of the pipeline are fastened by mechanical or electrohydraulic welding.

When installing a gravity system, detachable pipelines. For example, in the sewer, where water does not enter under pressure. Also, the collapsible method is used when assembling devices with a small cross section.

Detachable pipe connection can be flanged, coupling, collet crimp, meaning using fittings.

A fitting in plumbing is a connecting part of a water pipe, installed at the joints, at the branching points, at the corners, at the junction of fragments of different diameters.

Also, the mounting of connecting parts is carried out at the intended place of repair work, where additional elements are connected or a change in configuration is observed.

Varieties of elements

The fittings used to assemble the elements into a single network are of different types. For their manufacture, polypropylene is used, and they can also be brass.

In connection with the application, they are divided into categories:

More often, the use of these connecting elements is used in collapsible structures, but there are varieties that are used to create an integral network - electric welding or welded fittings.

Types of fittings

According to the design features, fittings are of several types:

Methods for connecting polyethylene pipes

HDPE pipes can be connected in 2 ways. The first is divided into:

• butt welding;
• electrofusion welding.

The second method provides for connection using a coupling and fittings.

Sewer pipelines are less demanding than water pipes. This is explained by they are non-pressure and are divided into:

• socket connection;
• fitting connection.

Union connection

Couplings of polyethylene pipes made by extrusion are widely used in the installation of the pipeline. Coupling connections make it possible to quickly, reliably and without any extra devices connect the ends of the pipeline.

Advantages of this connection method:

• resistant to mechanical stress and temperature extremes;
• fasteners are reliable and durable;
• wide application;
• low price of polyethylene materials;

When installing the pipeline, use such types of couplings:

Compression fitting connection

Compression fittings simply connect polyethylene pipes.

This is done in a certain sequence:

The nut should be tightened exclusively by hand because using a wrench can be overdone.

Pressure pipelines are mounted with welded joints with an integral type. Installation is not difficult and does not require special qualification skills.

Butt welding

To connect HDPE pipes by butt welding, a special soldering iron will be required.

The work is performed in the following sequence:

• The ends of the pipe are fixed with the paws of the welding machine and centered;
• The surface is heated before melting begins;
• The melted ends of the pipes are pressed together;
• The seam is then cooled naturally.

Electrofusion welding

This method is slightly more complicated than the butt welding method and will require special couplings with electric spirals, which heat up the element, provided that voltage is applied. The elements are welded to the coupling.

The advantage of this method is the simplicity of the work performed. The downside is the high cost of the electric clutch. If a lot of connecting elements are planned, then it would be more expedient to use contact welding.

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

Socket connection

Socket connection of HDPE pipes is one of the most economical methods. After all, there is no waste of welding. But this type is only suitable for non-pressure highways. The flares are not able to properly connect the pressurized system.

To ensure tightness when immersing the sockets thereof into another, it would be more expedient to use sealing rings, such as rubber ones.

PND water pipe - dimensions and prices

If you need a HDPE pressure pipe, then it is much larger in thickness than non-pressure products. For example, in the case of gravity sewerage, pipes with SDR values ​​​​from 26 to 41 are used, and for a low-pressure water supply system of a low-rise building, pipes - SDR 21-26 are quite suitable.

If there is a need to provide high pressure for the main water supply or to arrange a pressure sewer, the SDR indicators should be no more than nine.

When choosing HDPE pipes for laying sewers, the size and price will depend on the fact that a product with a larger diameter and greater wall thickness will cost more. This also applies to other PE pipes.

Modern construction is not complete without the use of polyethylene pipes. These products are produced under low pressure and are used in the construction of non-pressure and pressure pipelines. To obtain such pipes, polyethylene is used, which has the grades PE 100 and PE 80. The material has high elasticity, so it is very easy to work with it, and the laying of the pipeline is carried out in a short time and with less labor. Among the advantages of using such pipes are a long service life, no corrosion, resistance to negative factors, the possibility of trenchless laying of the pipeline, as well as a smooth surface, which ensures the unhindered passage of fluid.

Among other things, polyethylene pipes are lightweight and allow you to quickly mount systems of complex configuration. The material is resistant to temperature changes, has high ductility and mechanical strength. This product can be used in regions with high seismicity as the systems undergo ground movement.

Varieties of polyethylene pipe connections

If you are thinking about how to connect HDPE pipes, then you should first familiarize yourself with the methods of work. Depending on the purpose of the piping system, one of two methods can be used: detachable or one-piece. The first technology provides for the possibility of dismantling during operation. Whereas they do not provide for the possibility of subsequent disassembly. If you decide to use a detachable connection method, then you should use flanges that are made of steel. In this case, the connection is called flange.

Before connecting HDPE pipes using the one-piece method, you should acquire a welding machine, while the pipes will be welded end-to-end to each other, and the master will have to use superimposed couplings. Electrical heating elements are connected to the connection. Among other things, you can use which requires the use of compression fittings. This technology is used on pipelines of small diameter.

Why choose a detachable connection

If you are thinking about how to connect HDPE pipes, you should think about the methods of work. Recently, experts have increasingly advised using the split method, which has a number of advantages over the one-piece method. Firstly, a detachable connection allows you to save money, secondly, it is more affordable, and thirdly, the master will be able to increase the speed of the work. If we consider the first option, then you will not need to use special expensive equipment for welding polyethylene products or pay for the services of a specialist. Moreover, a detachable connection can be made even where the use of welding is not possible, such as underwater conditions. And finally, this method allows you to connect products at high speed.

Detachable connection features

Before connecting HDPE pipes with a detachable method, you should choose a method that can be socket or flange. In the first case, elastic seals should be used, which are most often used in the arrangement of free-flow sewer pipeline systems. As for the fitting, or in these two cases, fasteners are used.

If you are faced with the question of how to properly connect HDPE pipes, you should become more familiar with the features of using couplings. These parts are elements of polyethylene, and extrusion technology is used in their manufacture. This method eliminates the use of welding machines and does not involve the purchase of expensive equipment. As practice shows, couplings are cheap, and their use allows saving on construction.

Why else should you use clutches

Couplings are quite common when connecting polyethylene pipes for the reason that they have a long service life, which reaches several decades. As a result, it is possible to obtain the most reliable fastening, which is resistant to aggressive environments. The coupling has a wide area of ​​use and can be used for arranging pipelines for almost any purpose.

Use of fittings

Novice craftsmen often wonder how to properly connect HDPE pipes with fittings. When carrying out such work, certain rules must be followed. They provide for the need to disassemble the compression fitting by unscrewing. The pipe must be cleaned of dirt, and a chamfer must be made at its end. To do this, you need to use a beveler, but in the absence of this tool, you can use a sharp knife. If you are faced with the task of how to connect pipes with HDPE fittings, then you need to make a mark on the product with a marker, which will determine the depth of entry into the fitting. Before introducing the part, the pipe must be moistened with liquid soap. Next, the introduction is carried out, and when performing this action, you will have to make an effort, since the rubber seal creates a certain resistance. At the final stage, the fitting nut is tightened. In this case, it is important not to overdo it so that the connection is not overtightened.

Connecting a plastic pipe to a metal

If it is necessary to lengthen an old metal pipeline, it often becomes necessary to connect it to a polyethylene product. To do this, prepare two sliding keys, tow or Teflon tape. You will need an adapter with one end in the form of a metal product, and the other end should be in the form of a socket for a movable connection of a plastic pipe. If you are faced with the question of how to connect a HDPE pipe to a metal one, then at the first stage it is necessary to unscrew the pipeline coupling in the place where the connection is provided.

One needs to hold the coupling, and the other - the pipe. If it is not possible to unscrew the connection, an oil with increased penetration can be used. The next step is to use a plastic pipe tool and seal the threaded connection. This will prevent leakage later on. On the pipe, clockwise, several turns of the tape should be made, closing the thread. If you are thinking about how to connect a HDPE pipe to a steel pipe, then at the final stage you need to install and tighten the adapter. The connection is tightened until you feel resistance. It is not recommended to screw fittings with PVC female threads onto metal, as these two materials have different thermal expansion.

Connection of a polyethylene pipe with a faucet

The most popular method of joining a polyethylene pipe with a ball valve is butt welding. It should be carried out using a special installation in which both edges of the workpieces to be welded are fastened. The surface is cleaned of dirt and degreased. The heating element will increase the temperature of the edge of the polyethylene pipe to a viscous state, while the mechanism of the apparatus will help strengthen the elements to each other. After it was possible to connect the HDPE pipe to the faucet, it is necessary to leave the elements to cool completely. If the work is carried out correctly, the welded joint will look like an even seam of the same height around the entire circumference.