Connecting fittings for polyethylene pipes. Compression fittings for polyethylene pipes. Advantages of polyethylene fittings

Compression installation technology has a number of advantages:

allows you to create flexible and rigid connections;
eliminates the need to thoroughly align HDPE pipes;
ensures complete tightness of the polyethylene water supply;
does not require application welding machine and the presence of special skills;

Design compression HDPE fittings includes body, cover, press-in nuts, O-rings and ferrules. To produce these elements, polypropylene copolymer, acetal resin, food-resistant rubber and stainless steel are used. The materials comply with sanitary standards and are suitable for drinking water supply.

Connecting HDPE pipes using compression fittings called collapsible, because such a structure can be assembled and disassembled several times. For installation, it is necessary to cut the pipe at a right angle, chamfer it and insert it into the connecting piece until it stops. Then, using a compression wrench, tighten the press-in nut as much as possible. As a result, the crimp ring is tightly fixed to the segment and ensures a tight connection.

HDPE compression fittings from OptiPlastik

Our online store presents products from reliable manufacturers: Kokhanovsky Pipe Plant (Belarus), Georg Fischer (Switzerland) and SAB (Italy). We have established partnerships with suppliers, so we can offer optimal prices and delivery times.

The catalog includes about 200 items of fittings of various diameters:

plugs, couplings, bends, tees Ø 20-110 mm, PN 10;
flange connections Ø 50-110, PN 10;
threaded saddles Ø 20-315, PN 10 and 16;
ball valves Ø 20-63, PN 10 and 16;
keys Ø 20-75 and 63-110.

The fittings are suitable for creating plastic water supply systems from any grade of PE. If required sizes are not in the catalog, we will arrange their delivery as soon as possible. You can pick up the goods yourself from warehouses in Moscow, Klimovsk and Novomoskovsk or order delivery throughout Moscow and the Moscow region.

In this article we will try to systematize all methods of connecting polyethylene pipes.

As part of the article, we will also touch on connections different types welding, and compression fittings for polyethylene pipes.

Features of the material

What do we know about polyethylene pipes?

They are plastic. The elongation at break of polyethylene lies between 500 and 600 percent; For finished products GOST sets a more modest value: 250%.
What does this mean in terms of connecting several pipes into a long water pipe? Only one thing: there is no point in cutting a thread on a relatively thin one. She still won't be able to withstand much pressure.

Tip: However, there are some applications where threaded polyethylene pipes are used.

In particular, for using HDPE pipes as casing when drilling water wells.

There are threaded pipes here - perfect material. They connect without thickening or unevenness, which is very important in this case.

This connection is not suitable for a water supply system, but for a well it is just right

They are fusible. The melting point of polyethylene lies in the range of 105-135 C, depending on the polymerization conditions, but the material begins to soften already at 80 C.
This, in turn, means two things: you cannot install polyethylene pipes for hot water; they can be joined by cheap and simple low-temperature welding.

Hence, there are two main methods of connecting pipes: compression fittings for polyethylene pipes and welded joints of various types.

Connection methods

Butt welding

It’s worth mentioning right away: polyethylene pipes are not always connected using fittings. Pipes large diameter In general, they are cooked strictly end to end. In fact, it’s a big problem to heat fittings with a diameter of about a meter on a soldering iron and put them on a pipe in a few seconds before the plastic hardens.

For the installation of large-diameter pipelines, special heating devices are used, which, after alignment, melt the ends of the pipe and allow them to cool as a single whole.

The strength of such a connection reaches 90% of the strength of a monolithic pipe; with the wall thickness of the main pipes being several centimeters, this is more than enough.

Weld fittings

Fittings for polyethylene pipes for welding are no different either externally or structurally from the same ones.

The installation principle is exactly the same:

Pipe and fitting are prepared. The pipe is cut strictly at right angles to its axis; chamfers are removed from the outside of the pipe and the inside of the fitting.
This is necessary so that the pipe fits into the fitting without irregularities or burrs.
The soldering iron nozzle is selected according to the diameter of the pipe. After it has warmed up, a fitting is put on its narrow side for a few seconds, and a pipe is inserted into the wide side.
The melted surfaces are combined and fixed until the polyethylene hardens. You can move on to the next connection.

Tip: when choosing a temperature, do not forget that polyethylene melts at a temperature fifty degrees less than polypropylene.

Also, never twist the pipe when inserting it into the fitting. It will gather in waves, which will dramatically weaken the connection.

Electrofusion connections

Before us special case fittings for welding. The only difference is that they do not require a soldering iron: a spiral of metal wire with high resistance is part of the fitting itself.

This greatly simplifies installation, making it extremely simple and fast:

We completely assemble the water supply system in the configuration we need;
We fix all its main elements with plastic latches or any other way;
And then we simply walk along the installed water supply with a simple transformer or even car battery with a couple of wires. Each fitting is briefly energized. At the same time, it is fused with the pipe into a single whole.

Polyethylene pipes and fittings connected by welding have one drawback: all connections are permanent. Any change to the plumbing configuration will simply have to be cut and welded again using a new set of pipes and fittings.

The following installation method completely eliminates this problem.

Compression fittings

In this case, polyethylene pipes and fittings are connected in approximately the same way as in the case of metal-plastic. However, the use of a split ring, which compresses the pipe onto the fitting fitting, is not applicable here.

Soft polyethylene simply deforms or breaks in the place where the greatest force is applied.

That is why compression fittings for polyethylene consist of the fitting body itself, a union nut and a rubber seal located between them and the pipe. The nut is screwed onto the thread of the fitting and compresses the rubber, sealing the connection.

The advantages of this method are obvious: the connection can be mounted without any tools, with bare hands. Of course, with a small pipe diameter: after all, compression fittings are produced up to a size of 110 millimeters.

Unfortunately, the quality of the connection very much depends on the reliability and durability of the rubber seal. Low-grade rubber is not applicable here: as soon as it loses its elasticity, the connection will begin to leak.

In addition, resistance to external mechanical influences also leaves much to be desired. Simply tripping over a pipe, it is not a problem to tear it out of the connection. IN apartment building this could lead to a not-so-pleasant date with your neighbors downstairs.

Conclusion

Polyethylene pipes and fittings are undoubtedly an excellent choice for cold water supply systems. From the point of view of reliability and durability, the leader is welded joints, and from the point of view of ease of maintenance, compression fittings are the leader. The choice is yours. Good luck!

Allows you to reliably make connections without the use of special welding equipment for connection plastic pipes. The plastic pipes are connected using a crimp method.
Advantage compression fittings is simplicity and ease of installation. There is no need to pre-prepare the connected pipes for installation. No special skills are needed to assemble compression connections; compression fittings are supplied completely ready for installation, assembled and complete.
Compression fittings have another important advantage - such connections are collapsible, and this allows, if necessary, quick dismantling or alteration pipeline system. Installation of polyethylene fittings can occur in almost any weather conditions, including freezing temperatures.

Description and technical characteristics of compression fittings

Compression fittings are intended for connecting pipes in drinking pressure and technical cold water supply systems, as well as in pipeline systems with working environment, in relation to which the chemical resistance of the products is ensured. Compression connections have different operating pressure in accordance with the labeling.

Compression fittings are made from durable polyethylene and polypropylene. Polyethylene fittings with threaded transitions fit into metal products and products made from other materials with appropriate inch threads.
Compression polyethylene fittings reliably connect pipes made of the following materials:
- HDPE (PE80, PE63, PE100, etc.)
- PPRC (polypropylene type 3 - cold pipelines)
- PEX (cross-linked polyethylene - cold pipelines)

A short list of compression fittings for connecting plastic pipes

Fitting name	Drawing	Existing dimensions (diameter, mm)
Connecting coupling for pipes of the same diameter		20,25,32,40,50,63,90,110
Transition coupling for pipes of different diameters		20-63
coupling with external thread for changing from a plastic pipe to a metal one		20 x 1/2" ... 63 x 2"
Coupling with internal thread for transition from plastic to metal pipe		20 x 1/2" ... 63 x 2"
Bend (elbow) for changing the direction of the pipeline		20,25,32,40,50,63,90,110
Bend (elbow) with internal thread for changing the direction of the pipeline with simultaneous transition to a metal pipe		20 x 1/2" ... 63 x 2"
Bend (elbow) with external thread for changing the direction of the pipeline with simultaneous transition to a metal pipe		20 x 1/2" ... 63 x 2"
Tee for the production of a branch of a plastic pipe		20,25,32,40,50,63,90,110
Tee with external thread for producing a branch with simultaneous transition to a metal pipe		20 x 1/2" ... 63 x 2"
Saddle for connecting a branch plastic pipe to an existing pipeline		63 x 25, 110 x 32, 110 x 40
Saddle with internal thread for connecting a branch metal pipe to an existing pipeline		25 x 1/2" ... 315 x 4"
Connection with built-in ball valve		20 x 20, 25 x 25, 32 x 32, 40 x 40
Connection with internal thread with built-in ball valve, with simultaneous transition to a metal pipe		20 x 1/2", 25 x 3/4", 32 x 1", 40 x 1 1/4", 50 x 1 1/2", 63 x 2"
Flange connection for transition from a plastic pipe to pipeline fittings with a flange connection		50 x 50, 63 x 50, 110 x 100
Plug for permanent or temporary sealing of the end of a pipe		20,25,32,40,50,63,90,110

Complete set of compression fittings

Compression fittings are complete products. This means that all product elements are interchangeable only within the same type of product group.
It must be borne in mind that the split ring, designed for axial fixation, is made of durable but fragile polyamide. If it fails, the compression fitting must be disposed of.
The sealing collar is made of EPDM material (rubber-like plasticized polyethylene). The body of the compression fittings is made of polypropylene. To give additional strength to products with internal threads, certain types of couplings and saddles may have an external reinforcing ring made of steel.

Storing Polyethylene Compression Fittings

Compression fittings must be stored indoors, protected from direct exposure sunlight. Storage at subzero temperatures is possible without restrictions. When storing compression fittings in heated rooms, it is not recommended to place them at a distance closer than 1 meter from heating devices.

Installation and use of compression fittings

Compression fittings can be installed without the use of special tools (small diameters) or using special wrenches included in the product range. Instructions for installing compression fittings are given below.
The threads of transitional compression fittings must be sealed using FUM tape, and the tightening force of threaded connections must be controlled so as not to subject the connections to additional mechanical loads.

Installation instructions for compression fittings

Method of connecting HDPE pipes with diameters from 20 to 50 mm.

Pipe preparation.

Installation.
The pipe is inserted into the compression fitting up to the mark. ATTENTION! The force of pushing the pipe must be significant, otherwise it means that the pipe has not entered the rubber seal. The union nut of the compression fitting is tightened to the end of the thread.

Method of connecting HDPE pipes with diameters from 63 to 110 mm.

Pipe preparation.
The pipe is cleaned of dirt. The pipe is cut with an even cut, perpendicular to the axis of rotation.

Preparing the compression fitting.
The compression fitting is disassembled, and the following are removed: rubber O-ring; persistent cup; split fixing ring.

Assembly.
Stage 1 - preliminary assembly.
Assembly occurs without a split ring. A rubber ring and a stop cup are mounted on the pipe. The pipe is inserted into the body of the compression fitting and a rubber O-ring is inserted into the gap. The ring is recessed as much as possible into the body and the thrust cup is pushed in. The coupling is additionally pushed onto the pipe until it stops. The union nut is screwed on and screwed in with a special wrench until it stops. In this case, the persistent cup settles into the body.
Stage 2 - final assembly.
The union nut is removed. The split ring is placed on the side of the pipe and moved towards the coupling. The union nut is screwed in with a wrench until it stops.

Installation of compression polyethylene fittings with an existing transition to a metal pipe.

Preparing the compression fitting.
The compression fitting is partially disassembled. The union nut is unscrewed 3-4 turns.

Preparing a plastic pipe.
The pipe is cleaned of dirt. Using a chamfer remover or a sharp knife, cut the outer chamfer on the pipe. On initial stage work, you need to mark the pipe: mark the depth of insertion of the pipe into the body of the compression fitting. Before installation, it is advisable to moisten the pipe with water or liquid soap. In some cases, lubricant is applied to the rubber ring of the coupling.

Preparing a metal pipe.
The pipe is cleaned of dirt. A thread is cut onto the pipe and a sealing material (FUM tape, flax, etc.) is wound.

Installation.
The plastic pipe is inserted into the compression fitting up to the mark. ATTENTION! The force of pushing the pipe must be significant, otherwise it means that the pipe has not entered the rubber seal. The union nut of the compression fitting is tightened to the end of the thread.
Metal pipe screwed into the thread of the compression fitting.

Operating conditions and safety precautions

Pipelines with connections using compression fittings are used at ambient temperatures of no more than + 40 degrees Celsius. It is possible to operate the pipeline underground and in the aquatic environment. Compression fittings are collapsible. It is recommended to install pipelines with compression fittings in such a way as to ensure access to them during operation.
The connection of plastic pipes using compression fittings is durable (the service life is comparable to the service life of plastic pipes) if the connection is constantly in a humid environment and is not exposed to unacceptable chemical substances and high temperature.

Our Company offers various types of plastic pipes for sewerage, water supply, heating, as well as connecting fittings for them. With an assortment and technical characteristics You can find it on the website page.

When assembling or repairing a water main made of polyethylene pipes, in areas of branching, bending and connecting pipes with different diameters, mechanical and welded fittings are used. They are focused on the requirements of GOST 27077-86, and include the following types of products:

For laying gas pipes: Thermistor and cast type fittings.
For water supply: compression (collet, clamping), segment welded and flange types.
For drainage system: corrugated type.

Design features

According to their functional characteristics, fittings are divided into the following types:

Tees (for joining 3 pipeline elements): straight for connecting pipes with the same cross-section and reducing (transition) for products with different diameters.
Angles (change the direction of the highway at a given angle).
Couplings (for joining pipes while stationary).
Crosses (for forming a single system of four products or dividing a channel into 4 branches).

Compression fittings

Used for installation of external water supply (drinking and irrigation purposes) with a diameter of 110 mm. The catalog of shaped connections is represented by couplings (equilateral and transition) with internal or external threads, elbows, adapters and plugs.

The main design elements include:

Hull part.
Cover with nut.
Seal.
Round clamp.
Pressure bushing.

Compression fittings provide crimping with a ferrule and sleeve. The ring prevents unscrewing during hydraulic shocks and vibration.

Positive characteristics:

Eliminates the need to use special tools.
Give flexible and rigid properties to the fastening.
Quick and easy to install.
Available in a wide range of parameters and raw materials used.

Cast connections

Cast fittings are integral structures produced under pressure with further mechanical processing. Used when laying water and gas pipelines. Allows for turning and branching, joining pipes with different parameters. It is allowed to connect cast clamps with welded ones.

To connect to the pipe, butt welding technology is used - the ends are aligned and melted, the resulting connections withstand pressure, similar to a PE pipe.

An additional method of joining is the use of welded couplings. Cast shaped elements have an extended shank for mounting thermistor couplings.

Electric welded connections

They are represented by a series of connecting elements, for the fixation of which the technology of melting the upper part of the contours and walls of the fittings using a heating coil inside the connecting element is used. They belong to the low price category and are used in limited space. The maximum pressure range reaches up to 25 atm. Temperature up to 40 degrees. The connection to the pipeline is made by butt welding.

Segment fittings

They are formed under the influence of welding HDPE 80. They are used in branched water pipelines.

Thermistor connections

Operating principle: welding equipment is connected to the outputs of copper windings located inside structures. The current passed heats the winding, the fitting melts, connecting to the pipeline. The disadvantages include the high cost and the need to use special welding machines.

Flange Clamps

Connecting circuits with fittings using flanges contributes to the tightness of the pipeline and prompt assembly/dismantling of the system. It facilitates the technology of connecting various containers, equipment and mobile mechanical elements. Paronite gaskets are used as seals.

Corrugated pipe fittings

When connecting elements of a water main and a gravity drainage system, welded fittings made of corrugated pipes are successfully used. To prevent the pipe from moving during installation, a special rubber seal is used, located in the inside of the socket.

Fittings diameter

The dimensions of the connecting elements directly depend on the parameters of the pipes, their throughput and wall thickness, but you should remember a number of nuances:

Thick-walled products. Marking allows you to find out the outer diameter of structures, without taking into account internal parameters. And thick walls affect the reduction of internal permeability parameters.

Surface roughness. The internal coating of PE pipes is characterized high performance smoothness. This helps speed up the transport of fluid and reduce the level of plaque formed.

Due to the increased wall thickness, the most popular option is a diameter of 20 mm or more. Compared to metal-plastic pipes, then the most popular parameters correspond to the number 16.

Common PP fittings and pipes include products with parameters of 20, 25, 32 and 40 mm. The maximum size threshold includes 110 mm, but it is in little demand.

Advice: for water supply in private construction with an optimal number of water points current solution pipes with a cross section of 20 mm will become.

Pipe joining technology

The connection of PE pipes is carried out using 2 methods: welded and detachable. Welding technology means that the ends of the circuits are preheated to viscosity, connected and subjected to pressure until they completely merge relative to each other. After welding work is carried out in compliance with the temperature and requirements, a durable monolithic seam is obtained. This technology is used for structures with a cross section of 50 mm.

The detachable technique is performed using compression-type clamps made of brass or plastic. The need for constant monitoring of the connection eliminates the possibility of its use in hard-to-reach areas, so it is more often used in residential buildings where it is required a large number of turns and turns. If it is necessary to lay a gravity pipeline or gas lines, this method is the simplest and most economical. The exceptional advantage is that there is no need to use a welding machine, special experience and knowledge. Installation can be done by yourself.

Mechanical (detachable) fittings

Clamp fittings are used for technologically simple and economically affordable creation of specified configurations of pipelines of any complexity. For repairs and installation of water pipelines, structures with a diameter of 20-110 mm are used.

This is due to the lack of connectivity thin-walled structures butt welding and the high cost of socket and thermistor welding methods.

Structurally, the connections are equipped with clamping parts and replaceable body parts (elbows, triple branches, etc.).

The flare nut is connected to the body, compressing the collet.
A toothed collet covers the PE contour and pulls it towards the body part.
The thrust ring transmits the tightening power of the nut to the O-ring.

The products of a number of manufacturers are represented by a single design of a collet and a thrust ring. The seal in the form of a ring ensures reliable sealing of pipes along the outer cross section. The housing is equipped with internal stops that prevent the movement of pipes in the connection. The product parameters are indicated on the body part.

Selection of materials

The body and nut are made of PP, the gear collet is made of hard polymers: POM (polyoxymethylene) or PPO (polyphenylene oxide). The seal is made of reliable and flexible NBR rubber.

When using products, with an increase temperature regime a lower pressure is provided, which is due not to the strength characteristics of the connections, but to the PE pipes. As the heating level increases, the PE becomes softer; pipes may come out of the tee or elbow with insufficient axial force.

The table shows the operating pressure, but in practice a short-term increase is possible.

The standard set of fittings includes:

Solid systems are complemented by tank connections, adapters to metal pipes, adapters and tees. Tank connections are used for quick and reliable connection of a PE circuit to a container (made of plastic or metal) for liquid media.

They are presented in the form of a coupling with an extended thread, a plastic nut and a seal. The seal is provided not along the thread, but along the surface of the tank.

Adapters for metal pipes provide easy connection of a polymer thread or PE circuit. Adapters are produced only for pipes with a cross-section of 15-28 mm.

Brass connections

They are comparable in quality to PP fittings and have a similar design. The key advantage is the ability to connect with “bad” metal threads and reusable use.

The toothed collet is made of metal or plastic. The first option is used for clamping PE and PP structures. For installation, use a regular wrench. In terms of cost, polymer fittings win 1.5-2 rubles.

Saddle bends

They often replace tees when it is necessary to branch a water line. This makes it faster and more economical. But the circuit coming after the saddle tap will have smaller parameters. To divide the flow evenly, you will need a tee.

Saddle bends are presented in the form of polymer clamps with a side outlet (threaded connection inside the pipe). A coupling with an external thread or a shut-off valve is screwed into the outlet. The bends correspond to the parameters of standard pipelines: 25 - 315 mm. If the threaded outlet has a steel ring to prevent it from breaking if installed incorrectly, it is a heavy-duty fitting.

Threaded connection of adapters

The product range includes:

This includes transitions from external to internal threads and vice versa. “Bushies”, “footers” and “cuttlefish” provide a transition between threads of different sections and threads. They convert a threaded clamp coupling into an elbow. However, a large number of adapters can harm the system: the optimal solution would be a line of 1-2 threaded connections.

Cost of fittings

Fitting prices have little impact on the overall price of the pipeline line. For example, a threaded coupling d = 25-32 mm has a cost similar to 1.5-2 m of pipeline. A similar coupling Ø 6.3 cm is comparable in cost to a pipe 2.5-3 m, and Ø 11 cm is comparable to a pipe 4 m. Fittings with such parameters are more expensive than thermistor clamps.

Video

Polyethylene pipelines have increasingly become used in modern repair work. In new homes, as well as major repairs It is almost impossible to find old welded steel pipes anymore. Even when installing heating, they are increasingly resorting to the use of metal-plastic structures. This pipeline is much cheaper to operate, more durable and is not affected by such phenomena as foundation settlement, which is why in old buildings depressurization of the pipeline regularly occurs in places where it is weakly connected.

To install a new generation of pipeline structures, fittings for polyethylene pipes are used. With their help, you can mount any configuration of the pipe network, as well as provide the necessary branches and bends.

Fittings that connect pipes of the same width are called straight, and those products that are designed to connect pipes of different diameters are called transitional.

Connecting pipes using fittings is distributed through wide range samples on the market.

Fittings can:

Provide pipeline bends at various angles.
Provide connections in various directions.
Work to increase or decrease the width of the pipeline in the right places.

Only fittings for polyethylene pipes for welding differ from all other types of products in their functionality. This auxiliary part is installed on the pipe, and then the joint is heated with a special soldering iron. In terms of strength, this type of connection is not inferior to solid casting. The only disadvantage of this design is that once the system is dismantled or reconfigured, they cannot be reused.

Compression fittings

This type of fittings for connecting polyethylene pipes is optimal because installation does not require any special skills or tools. To install them, you will only need the muscular strength of your hands. Compression fittings are a plastic body with rubber gaskets and two clamping nuts. The nuts are screwed onto the ends of threaded pipes, and a well-tightened rubber gasket prevents liquid from leaking into the joint. The outside of the nut is usually covered with hooks so that it does not slip out even from wet hands when tightening.

A pipeline with compression fittings can be easily dismantled, so it is very convenient to use, for example, on summer cottage for surface installation of water supply. For the winter, it can be easily disassembled and stored in a specially designated room.

In addition to compression fittings, other types are used to fasten pipes. Let's look at them and compare them with the first option.

Electrofusion fittings

This type of pipe fastening can be called the most exotic. At the same time, it provides one of the most reliable and durable connections. Electric-welded fittings for polyethylene pipes are a plastic housing, inside of which there are copper heat and energy carriers that have an outlet for a special electric heater. Electricity, supplied to the outlet, ensures gradual heating of the fitting, resulting in a continuous seam.

The electric welded connection is very strong and has many undeniable advantages. For example, a pipeline connected using such fittings can be disassembled and reused. To do this, you need to reheat the fasteners and disconnect the pipes. The connection is very reliable and is not inferior in strength to a solid cast system. It is very easy and quick to install a pipeline using electric welded fittings, so this option is perfect for systems with big amount branches and bends. This design can be installed in places where it is impossible to reach with a soldering iron or hands. Repair of the electric welding system is carried out quickly without making changes to the overall circuit. The welding process can be carried out automatically, and fittings are recognized by the bar code indicated on the body.

Of course, this type of fitting is very convenient to use, but there is also a dark side to the coin. The disadvantage of such systems is their cost. The high price is due to the use of expensive materials in the fitting design. On the other hand, securing the pipeline is not something you should skimp on, so the choice is yours.

Press fittings

Press fittings for polyethylene pipes are very convenient to use because their installation requires a minimal amount of equipment. This fitting is a body with several gaskets, as well as two sleeves, which are pressed onto the ends of the connected parts of the pipeline.

Most often, exclusively straight options are used as press fittings.

Pressing is carried out using special press pliers, which press the sleeves with enormous force, eliminating the possibility of leakage. These fittings have an antistatic ring, which prevents charge from accumulating due to the potential difference between the two types of material.

Press fittings have many distinctive qualities. For example, their installation does not require electricity or great physical effort, since the fasteners are installed using a press jaw lever. In addition, press fittings provide high reliability of the connection, since the joints are made of metal. Using press pliers, you can also disassemble the pipeline, but to reinstall the system, you need to number each fitting so that it is reinstalled in its original place.

Brass fasteners

Brass is one of the softest copper alloys, which has a number of advantages over steel. Typically, brass fittings for polyethylene pipes are installed on threaded connections. Brass can also be used in the production of press fittings. Copper alloy fittings have a large margin of safety, exceeding that of plastic products. Brass fittings are usually produced in various options, which allows them to be used for installation of non-traditional systems.

Brass fittings have their advantages. They can be used to extend pipes. If you use FUM tape, the connections are quite tight. Brass is also a flexible and pliable material, which makes it possible to install a polyethylene pipeline with tension. In some situations this is the only way out. It should be noted that brass is absolutely harmless and does not burn. When used, it instantly becomes covered with a layer of patina, which is inert to both cold and hot water. In addition, a brass pipeline can be cleaned with acid; this will not affect its properties in any way, unlike steel systems. When vibrations occur, brass connections are not destroyed due to the flexibility of the material.

Compression fitting. What is this?

Compression fittings for polyethylene pipes work using the technology of tightening a ring made of flexible material with a slot while tightening the crimp nuts. Typically, compression fittings are made of brass or plastic. They do not require installation professional equipment, during the installation process you need to use the muscular strength of your hands and a pair of wrenches.

There is another type of compression fittings - collet designs. The principle of crimping in this system is similar to that by which the lead is held in collet pencils.

Fittings with a crimp system are distinguished by the fact that they make it possible to hide the error in the diameter of the pipes being connected, thereby eliminating the need to calibrate the structure. These fasteners are perfect for repairing a pipeline break, regardless of what the pipes are made of. The main thing is that at least a small chamfer is removed from the surface.

Preparing and installing fittings

The process of joining polyethylene elements is distinguished by its ease and speed. In addition, such systems are durable, reliable and economical. This is what triggered the rapid growth in sales of products made from this material. For high-quality installation design, you need to use instructions compiled by professionals. Installation work Connecting polyethylene fittings and pipes requires special training:

The amount of material required must be calculated in advance; for this, the total length of the system, the number of corners and differences are measured.
Turn off the water supply before installing fittings and polyethylene fittings.
If the room is installed heating system, then start its work from the boiler.

Welding of polyethylene fittings with pipes occurs according to the following principle:

1. After cutting the pipes to the required size, you need to chamfer the edges.
2. Insert the PE fitting and the prepared edge into the soldering iron nozzle at the same time.
3. Heat the parts for a couple of seconds, then remove them from the attachments and fasten them together.

For a long time, the only materials that were used in sewer systems oh, there was steel and cast iron. The advantages of these materials include long term service and strength, and the disadvantages are complex, labor-intensive installation, high cost and deterioration in the quality of the transported substance.

In the last few years, there has been a lot of work to replace old materials in sewer systems. Manufacturers tried to find a material that would include all the advantages of cast iron and steel and exclude their disadvantages. Not so long ago this substance was found, it is polyethylene, and now both pipes and fittings are made from it. Initially, plastic products did not have such a high level of strength, they quickly deteriorated and crumbled under the influence of water and sun, but now all these problems are a thing of the past, and now polyethylene pipes, fittings and fittings are the most reliable and inexpensive components of the sewerage system, which is widely trusted by both construction professionals and ordinary citizens.