Efficiency of functioning and non-pressure and pressure pipelines, first of all, it depends on the tightness of the joints between the elements. Therefore, a reliable connection of plastic pipes is a guarantee of performance of the pipeline. And to improve the reliability of any pipeline or conduit made of plastic were invented several types of connections of the system components. Moreover, in non-pressure pipelines practice their methods of joining, and pressure systems – their own.

And in this article we will introduce our readers with the most popular ways to connect pipes made of plastic, classifying options for the application and the type of structural material of the pipeline installation.

Method of connecting plastic tubes in pressure system

Pressure pipelines suggest the possibility of transporting the medium in large quantities, in conditions of constant diameter of the pipe increases the pressure in the system.

Therefore, such systems use pressure mounting options, such as:

The connection of plastic pipes to the threaded fitting or pressed clutch
Connection pipes of plastic welding
Connection by bonding of plastic components.
Each of these methods not only ensures a perfect seal of the joint, but also high strength connection compound. Therefore we offer to meet with them closer and deal with how to connect plastic pipes in some way.

Connection to the threaded fitting or press the clutch

Using threaded couplings (fittings), we can get a tight, durable and threaded fittings for plastic trubglavnoe, demountable connection. Screw pair formed an external thread on the end fitting and internal thread the mounting nuts.

Pipes up to 63 millimeters in diameter are placed on the fitting socket and locked in this position, clamping ring and mounting nut.

Using a press coupling, we have a reliable and tight connection, the disposable type. Locking fitting for a pipe fitting, in this case, it is realized by crimping the sleeve in a special compound. In addition to installation of plastic pipes, connections both ways – and a threaded assembly and fixing of the press sleeve – allow to execute even the connection of plastic pipes with an iron part of the pipeline. After mounting screw type fittings and couplings under the compact is made of metal.

In practice, the screw press and the installation is as follows:

The coupling (fitting) understands, and the pipe is cut at a right angle.
Mounting nut is put on the tube. Then there is put a crimp ring. When it comes to the press – coupling the item passed.
The tube fits over the nipple fitting until it stops.

If you are using metal and plastic products, in place of the contact end of the pipe and the fitting body is mounted an insulating gasket.

The next step is to press the clutch while pressing the sleeve comes with a special key. Installation of the nut is done even easier – the mounting nut screwed onto a threaded spigot fitting. And yet – the connection is ready for use.

Connection for welding

Before joining plastic pipe welding, we need to understand the following: all the elements of such a pipeline made of thermoplastic polymers, therefore, they can “melted”, pressed together and harden to form a single connecting seam.

Therefore, any welded reflow technology based on polymer tube outer part and inner part of the polymeric sleeve. And such fusion realized either by ironing – a heater and melted portions of the pipe coupling or via helix mounted in “subcutaneous” coupling layer.

The first method – installation using the ironing – is realized in the course of the following operations.

Initially, tubes are cut, is removed and the inner chamfer degreased pipe outer surface and the inner surface of the sleeve. Then the tube and the sleeve are placed on a heating element of appropriate caliber. Iron is included into the outlet and an inner layer and an outer layer coupling tube slightly melted. Further, the pipe and the sleeve removed from the heater, and one product is pressed into the other.

The second method – mounting sleeve with spiral – as follows.

The end of the pipe is cut at a right angle. This operation is repeated with a second tube.
The first pipe is inserted into the sleeve, the same operation is repeated with the second part of the pipeline.
By coupling contacts are connected terminals welder. The device is connected to the mains. Electricity melts clutch inner surface with a fusible insert. After some time, the device is disconnected from the network automatically. Melted plastic layer solidifies to form a reliable connection.

The latter method is also good because it allows you to arrange the connection of plastic pipes of different diameters. To do this, use the special coupler – coupler.

Compound adhesive

The connection is performed on the adhesive even easier than installation of the threaded fitting or the connection to the welding. To do this, you just need to lubricate the adhesive composition of the interior of the sleeve and the outer part of the pipe. Then parts are joined and after 10-15 seconds to form a monolithic structure. Wherein the connection of the plastic pipe with a metal part of the pipeline, in this case, is realized with a special fitting, consisting of a polymer which is molded into the housing in steel or brass part.

In practice, the process of connecting to the glue as follows: Connection pipes on the glue

Take the pipe and coupling. Cropped end of the pipe and remove the inner bevel. We treat the mating surface of a special composition that increases the adhesion of plastic and glue.
Apply the adhesive to the exterior of the pipe and the inside of the sleeve. Inserting the tube into the coupling. Binding compound for 15-20 seconds.
We treat the opposite side of the sleeve in a similar manner.

CONNECTION plastic pipes in non-pressure systems

The non-pressure systems transported medium is transported through pipes by gravity. Therefore, in these conditions, the internal pressure in the pipe will be equal to atmospheric pressure. As a result, non-pressure piping joints shall be protected only against leaks.

That is, the installation of such systems is to ensure a leak docking station, without paying attention to its strength.

The following options are pipe joints made of plastic therefore are used in non-pressure systems:

Mounting on socket
Mounting on coupling joint with sizing
Installation chasing joints.
All of these methods guarantee absolute tightness of the pipeline, providing further high speed of installation and free-flow system. Therefore, we will study these options docking much detail.

Mount Technology into the socket

Non-pressure plastic pipes – how to connect these products, in some cases, the manufacturer decides to be equipped with its products the socket connection elements. Flare – a thickening at one end of the tube. In this thickening insert the smooth part of the next pipe. The fixation and sealing compound provides the seal that was installed in the inner surface of the socket.

the following steps should be taken to mount the bell:

Trim the product at a right angle.
Insert sealing ring in the socket
Push the product in the flare of the compound
Check the location of the sealing ring.
This type of installation is used in the majority of sewer pipelines.
The technology of cold welding of PVC products

Cold welding of PVC pipes – this is a common bonding described in the section on methods of joining pipes. This method is based on the use of a special adhesive, picks up the pipe manufacturer. The connection to the glue involves cleaning of joints, glue application on the mating surfaces and rigid fixation of the pipe and the coupling.

The disadvantage of this method – the impossibility of gluing pipes at low temperatures (less than 4 degrees centigrade).

minting technology joints of cast iron pipes

Connection stamping is a special case of the socket connections. Only instead of the rubber ring, sealing the abutment, using tarred rope, pressed between the surface of the socket and the pipe. However, this method uses socket fixation only iron pipes.

To implement the technology necessary to insert the pipe into the socket, push round tarred rope – ropey – in the seam between the socket and the pipe. Wrap one turn and repeat the above step. After filling the space between the funnel and the tube ropey to cover the seam sealant (cement or resin).