In recent years there has been a steady trend: homeowners are replacing old iron pipes with modern ones made of polyethylene. This preference can be explained by an easy assembly process, low weight of structures, low cost, corrosion resistance, smoother inner walls. The last two characteristics make it possible not to lose water quality over time and prolong the service life of the pipeline itself.
Installing plastic pipes with your own hands any nonprofessional . The main thing is to follow the instructions from the manufacturers. When buying any pipe, look at its appearance: it should be clean and evenly colored, without damaging the material. No mechanical deformations or scratches are allowed.
Polyethylene pipes are used:
Polyethylene pipes cannot be used to supply hot water or in the heating system - they do not tolerate temperatures above + 40 ° C. In addition, it is impossible to assemble and operate such pipes in rooms where the temperature is below + 5 ° C. In the cold, polyethylene loses its plasticity and flexibility, so tightness can be broken.
There are several ways to connect polyethylene parts into a single unit.
Method number 1 . The connection of plastic pipes, working under high pressure, is carried out by butt welding. It is the most reliable method, suitable for difficult places and contact with aggressive media. Only products manufactured by one manufacturer can be welded to each other, since each has its own manufacturing technology. Pipes of different grades are likely to form a weak seam, which over time will lead to rupture or deformation.
Connection by fittings
Method number 2 . Fitting with threaded fittings. For better tightness, Teflon or some other seals are used. If you need to attach a plastic case to a metal one, you should take a transition sleeve or a combined fitting.
Method number 3. Assembling polyethylene pipes with glue or cold welding. Contrary to popular belief, such a connection may be stronger than the pipeline itself.
To begin, make sure that the pipes to be mounted fit together. The end is obliged to easily go into two thirds of the connecting cuff, and then move with difficulty. The edges must be treated with sandpaper, so that they become rough and wipe with a solvent of methylene chloride for degreasing.
The glue is applied with a swab with a thin layer both on the end of the inserted pipe and in the cuff. Pipes are reduced to the stop and slightly rotated. The whole connection process should take no more than a minute. Drying time - 1 hour, in case of high humidity - 2 hours.
Connection of pipes made of polyethylene
In addition, some rules should be observed during installation:
Installation of pipes from cross-linked polyethylene
Products from so-called cross-linked polyethylene can be used in hot water pipelines or heating systems. It is a polymer of high density, subjected to electron irradiation. Under their influence, molecular chains create a single three-dimensional structure.
Unlike conventional polyethylene, this material is very resistant to extreme temperatures and pressure. In the absence of mechanical loads, it can operate in the range from -120 to + 120 ° C.
Pipes are mounted in two ways:
In the first case, no special tools are required when assembling with your own hands. Only plastic secateurs and two wrenches are needed.
Press fittings or press fittings are classified as one-piece and need a press tool.
You often install polyethylene pipes and know all the details of their connection. Share your knowledge with our readers, leaving comments on the article.
We offer to watch a video on welding of polyethylene pipes in a joint.