Connection of polyethylene pipes

Installation of pipes from polyethylene

Connection of polyethylene pipes are:

• Disconnecting. They have the property to be disassembled during operation, and the connection is made using flange connections. There can be collet connections, which are made with the help of compression fittings.
• Non-disconnecting. They do not understand, and most often they are used for butt-welding and coupling.

Operation of heated tools for butt welding

Connection processes occur as follows:

1. The end parts of the parts must be installed in the center of a specific welding machine. All the end parts of the pipe must be wiped from the dirt with special napkins, then with the help of end devices, mechanical processes take place.
2. The chips produced should be approximately 0.5 millimeters, as well as the cutting mechanism is removed and the parallel pipes are tested.
3. Further work is carried out to heat the end parts. After completing this process, the heater must be removed from the welding zone.
4. All surfaces that have been susceptible to welding are closed for some time, and pressure is increased to certain results. Such a seam should stay with a certain pressure for a while, after which cooling takes place.

In order to determine the qualitative welding characteristics of the grate, it is necessary to look at the performance of the seam, its height characteristics, its width, as well as simply the aesthetic appearance that it has after the completion of all work.

Electrofusion connection

These connections are made by means of a coupling that connects polyethylene pipes with electric heating elements. The pressure should reach 16 atmosfer. This connection is more expensive than using butt welding.

Most often, a simple electrical coupling is used, which is used when connecting straight sections. Also, electric tees and all sorts of saddle branch structures can be used. Such connections are good for installation work with piping systems that have a small diameter.

Coupling welding has such technological processes:

1. Pipe preparation should be done in advance, in order to use the same clutches on the same axis, and also to wipe the dirt layer.
2. A connection must be made between the tool that supplies the electric current. Because of it, the electrical coupling is heated and the surrounding material melts.
3. Due to the fact that the polyethylene in the electric clutch melts, the heating passes to the pipe.
4. The welding pressure is obtained by expanding the pipe and polyethylene.
5. This tool can be turned off.

If an employee uses good and quality equipment for installation work, then the whole range of welding processes takes place in a separate form. Also, all data on all works will be recorded in the electronic plan protocol, which is a good proof of the quality of work.

As welding diameters can be large, special heating is required, which takes place in such steps:

1. The welding of the coupling parts takes place gradually from all the connecting sides of the pipe.
2. The first pipe is welded completely to one part of the electrical coupler, with the second part the next pipeline is welded.
3. If the electric coupling has a large diameter, then it must have a separate connector for connecting the spiral to the apparatus.

Types of disconnect connections

The most common and used connection is the flange connection. It is made with the help of a fitting for flange parts when connecting polyethylene pipes. Most often, this connection uses plug-in connections, for the design of pipeline facilities.

Compressor fittings can also be used, which are used for small diameters, not more than 50 millimeters, at such times when flange joints or butt welding is not profitable.

Collet connections are also used, for this type one must adhere to the pressure of 25 Atmosphere. Hermetic ability of this connection is achieved by means of a rubber sealing ring, and for resistance to mechanical shocks by inserting special teeth into the pipe.

Various connecting types

The most versatile way to connect polyethylene pipes is by butt welding using a heated material. This way gives all the possibilities of connecting pipes to parts or to each other. All pipelines, which are made by welding, have excellent strength.