How to connect hdpe pipe fitting

Polymers are firmly established in our lives. From this raw material are made a variety of items and designs. In modern sewer and water supply systems (and in other pipelines) use PND-pipes. Such products have the same strength as metal counterparts, but it is much easier to install and last much longer. It is possible to create pipelines from polymer pipes without special equipment or equipment. How to connect the pipe PND fitting will be described in this article.

Connection methods

To make a sewer or water supply, pipes must be connected, and the junction can be collapsible or non-separable. The second method involves welding. For this it is necessary to use special devices.

The collapsible connection has many positive qualities. Here are just the main ones:

• Ease of installation. All work can be done independently, even without an assistant.
• The possibility of dismantling. If the pipes are blocked or damaged, you can easily carry out repairs.

That is why almost all connections of HDPE pipes (especially in houses and apartments) are made using fittings or couplings.

Types of fittings used

For the installation of pipes made of polymers can be used several types of fittings. Namely:

• Electrowelded. It is a structure with a special element. With the help of electricity heats up the wire, which melts the plastic and creates a strong joint. With this fitting a permanent connection is created.
• Compression. This design is most often used for the installation of various pipelines.
• Reducing. This fitting is designed to connect pipes of various sizes.

Electrofusion fittings are used very rarely. This is due to the inseparability of the resulting connection and the high cost of the device itself. Reduction fittings are used when connecting pipelines to meters and other communications components. But compression designs are used most often.

The fittings themselves may have different geometries. Used as direct connections, and at different angles. Also widely distributed are various splitters, tees, and other designs. In addition, can be used as fixed connections, and with the possibility of displacement of pipes relative to each other.

We connect pipes using fittings

The compression fitting is most commonly used. This is due to its ease of use. How to connect the HDPE pipe using a compression fitting? This will be discussed now. The first thing you need to understand the device of this design. Compression fitting consists of:

• polyethylene shells;
• sealing rings;
• clamping rings are used to protect against mechanical damage;
• bushings;
• cover-nuts.

These fittings are available in various diameters. In the shops you can find construction for pipes from 16 to O 110 mm.

To connect pipes using a compressor fitting, you must follow the following instructions:

1. Understands the design of the fitting. The caps of the nuts are unscrewed and the ends of the pipes are put on them (it is necessary to remove the chamfer from them with a well-ground knife or a face-blower).
2. We mark at the ends of the pipe the distance at which they should enter the pipe. To facilitate the connection, you can moisten the fitting itself and the ends of the pipes with water or a mild soap solution.
3. Insert the pipe into the fitting to the marked length. This will require physical effort. So the pipe tightly enters the sealing ring.
4. Then tighten the cap-nut. It is desirable to do this without using a tool with just your hand This reduces the risk of over-tightening the nut, which means deterioration of tightness. This completes the connection process.

When using an electrofusion fitting, a source of electricity (generator or electrical socket) is required. The pipes and the connecting element itself are cleaned of pollutants and fixed on the same axis. At the same time it is necessary to achieve immobility of the whole structure.

Then a current source is connected to the fitting. As a result, the heating element begins to melt the plastic. In the molten state, the material creates the necessary pressure, and the pipes are firmly connected.

If you are planning to do plumbing or sewage with your own hands, then use a compression fitting. Such devices are quite simple to install and at the same time create a reliable connection capable of withstanding a pressure of 25 atmospheres. The use of electrofusion fittings in everyday life is extremely rare, due to the high cost and difficulty of use.

We also want to suggest that you read the articles about the water supply system:

• How to solder polypropylene pipes.
• How to connect polypropylene pipes.
• Loss of pressure in the pipeline.
• How to drown out the water pipe.
• How to get rid of condensate on the pipes.
• How to connect two pipes.

For a more detailed acquaintance with the process of connecting HDPE pipes, we suggest you view the video selected for this topic, which is located at the end of the article.

 Video

This video shows the installation of the compression coupling:

See how the welding of polyethylene pipes PND in the joint: