Pipes made of plastic differ from pipes made of other materials at a rather low price, as well as ease of installation.
They are used for equipping the pipeline of cold and hot water supply , as well as heating, ventilation and sewerage systems. The most common products are PVC and polypropylene pipes.
Plastic pipelines are mounted using soldering. The system can be assembled by hand if you follow all the rules.
Plastic pipes are divided according to the type of polymer, from which they are made:
Pipes can be used for cold (the pressure should be ten atmospheres, and the temperature should be twenty degrees or hot (the pressure should be ten atmospheres, and the temperature should be sixty degrees) water supply.
But a few types of pipes made of plastic are used in heating systems at a pressure of six atmospheres and a temperature of eighty degrees with its maximum value of ninety degrees.
Polymer pipes have a long service life, they also do not have deposits and condensation, they also have low noise level They are lightweight, do not corrode, durable, resistant to aggressive media and water hammer, and these pipes do not need to be painted or insulated. The service life of plastic pipes is about fifty years.
Important: Plastic pipes are sometimes reinforced with fiberglass or perforated aluminum to increase strength and reduce thermal and thermal expansion.
To do heating uses polypropylene pipes, which are resistant to pressure and temperature changes, and are also flexible.
Small-diameter pipes are used for water supply, and large-diameter pipes are used for sewerage systems.
To install plastic pipes, a set of parts must be used:
For transition between two pipes of different diameters, an adapter is used.
To connect pipes with the same diameter, use a coupling. The coupling has an internal or external thread. Pipeline turns are performed by taps. Tees are used to solder a unit of three pipes, and crosses are used to braze a unit of four pipes. The tee is also threaded.
If necessary, a detachable connection can be created. The pipeline is usually closed with plugs or bushings. The pipeline is attached to walls or other structures with clamps.Clamps are usually metal and plastic.
To connect pipes, fittings of different configurations are used.
Fittings are monopolymer and combined. With the help of monolithic elements, only plastic tracks are assembled, and combined elements are used to connect plastic and metal products.
The installation of plastic pipes for the cold water supply and for the sewage system begins with the calculation and design with the required number of parts. To conduct hot water, it is necessary to take into account the temperature expansion of the pipes.
Attention! If the maximum temperature difference is eighty degrees, then the elongation of each meter of the plastic pipe is 1.
2 centimeters, and the combined one is 0.2 centimeters.
If the length of the pipeline is more than 2-3 meters, when lengthening and increasing the temperature or compression during cooling of pipes, a large stress may occur at the joints. This situation can be very dangerous when using polypropylene pipes. To combat thermal elongation in the hot water supply pipeline, flexible compression loops or temperature compensators are installed.
These are Z and U shaped bends.
A simple version of the temperature compensator can be a flexible loop made of polypropylene pipes.
When installing plastic pipes, it is necessary to provide for the possibility of temperature movement of the pipes without obstacles. To ensure this, at the bends of the connected pipes, cavities are left, which are filled with soft material or leave air pockets.
.. you need a special soldering iron for manual soldering with a set of nozzles, special scissors, a tool for stripping pipes from the ends. First, pipe sections of the required length are cut. To do this, use sharp scissors that do not spoil the thin-walled pipe.
Before starting the soldering of the combined pipes, a stripping is done, in which the plastic layer on top and the middle layer, consisting of aluminum, are removed.
Welding is carried out only with special gloves. The soldering iron heats up to about 250 degrees. It is necessary to weld pipes very quickly, because if the molten surface cools, the joint will not be strong enough. At the final step, the pipe joint is fixed and held for up to ten seconds and cooled for up to eight minutes.
Most often, the hot welding method is used to install the water supply.
Wiring can be sequential, collector and with through sockets.
It is better to start the installation of plastic pipes with a detailed pipeline diagram, while keeping bends and details as small as possible. An open line assumes the installation of pipes in the corners in a vertical position, and horizontally assumes installation just above the floor. This location makes the water supply network unobtrusive.
With hidden wiring, installation is difficult and therefore requires accurate calculation. Only solid pipes can be installed in the walls and there must be free access to the joints.
Fittings are used to connect plastic pipes. Fittings are one-piece and split, threaded and threaded. Flexible hoses are connected with a one-piece fitting.
Important! Do not bend plastic pipes.
Couplings are used to change the line to another diameter or to connect straight sections. Tees are used to make branches. If the pipeline has turns, then they are performed with angles.
Plastic pipes cannot be bent, and if rotation is required, angle fittings are used.
The installation of plastic pipes includes the following steps:
The depth of the pipe entry into the fitting and the place of their connection are marked with a marker. Then the soldering iron nozzle is heated and the fitting is put on it and on the other end of the pipe, after the fitting and the pipe are heated they are connected to each other.
Pipeline installation is usually started from the farthest point from the entry.
When you cut pipes into lengths, you need to remember that fittings extend the sections by 3-5 centimeters. It is also necessary to ensure that the heating of the elements is simultaneous.
If the pipe diameter is less than fifty millimeters, it is best to chamfer a forty-five degree angle before brazing the pipes. For hot water supply, plastic pipes are attached more often than for cold water supply. Pipes are attached to the walls with clips, they are attached at a distance of less than one meter along the entire length of the pipeline.
Connection of pipes using couplings and fittings for them. The easiest way is to connect to a socket. As a rule, each pipe has a socket and a rubber ring, the end of the other pipe is inserted there up to a special strip.
When cold welding is used to join pipes, they are treated with a special chemical composition.
Installation of PVC pipes involves the preparation of the ends of the pipes that are connected and the procedure for gluing them.
But first, they check the fit of the elements.
Attention! The PVC pipe should freely enter the socket for two-thirds of the seat.
The surfaces to be joined must be rough. And for this, the socket from the inside and the end of the pipe are sanded.
The pipes are glued as follows:
If the adhesive is applied correctly, an even bead will form around the pipe.
Plastic pipes are used for the installation of almost all types of networks. And since the assembly and installation is not difficult, the installation of the pipeline can be done by hand.
Posted By: Work Style |12, Nov 2020
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Posted By: Work Style |12, Nov 2020