How to weld polypropylene pipes?

Today polypropylene tubes firmly occupied one of the first seats as a structural element of utilities. The main reasons for this success: environmental friendliness, low weight, strength, durability, low cost, convenience and ease of installation. The last reason, the subject of this article.

Consider the process of connecting two polypropylene tubes. This process is performed by a dedicated welding apparatus which is used for welding pipe bell and spigot.

First you need to prepare the pipe, which is planned to connect. Desirably the ends of the tubes clean from dirt and degreased, since this depends on the strength of a subsequent connection.

It must be remembered that the joining of plastic pipe butt (as, for example, metal) can not be due to poor quality weld. Therefore, they always connect the bell and spigot. For this, two tubes are connected not directly but via the connecting fittings.

To date, the sale can be found in many different fittings: couplings, elbows at 45 and 90 degrees, tees, crosses. Also for compounds of pipe sections interconnected successfully used steel flange. General connection scheme, first connects one pipe (its end) to the fitting (one end), then connected to the fitting (the other end) with the second pipe (its end).

Thus, a compound of two bell and spigot pipe. Pipes can be connected in the same diameter as the (conventional fittings) or different (for such compounds are commercially available special fittings).

It is also desirable to have on hand a tape measure (for measuring the right size pipes), Cutting of plastic scissors (with the help of them cut the desired size tube) and heat-resistant gloves. Often, all of these things are included in the package to the welding machine.

The very process of welding is as follows. The heater welding machine are inserted from both sides of the desired nozzle diameter and the fixing screws to the heating element. One nozzle is always under the fitting (its heating is carried out from the inside), and the other - a pipe end (heating performed from the outside).

Further. Included welding machine and warmed to the desired temperature. Standard welding temperature - 270 degrees Celsius. When the machine is warmed up to the desired temperature, simultaneously on two opposite sides in the nozzle fitting inserted (under internal heating) and the tube (under external heating), and maintained for a time. The dwell time is always specified in the instruction manual on the welding machine (it is usually from a few seconds up to one minute).

After holding fitting and the pipe are removed from the heating element and inserted tightly one within the other. In this operation, it is important to press strongly and tightly fitting to the tube and keep so for some (time also indicated in the instructions and is usually from 5 to 60 seconds) - the so-called fixation. After that you can release the connection and let it cool. cooling time is generally a few seconds (2 to 30).

Thereafter, the compound acquires the necessary strength and can already be used. In carrying out all these processes, it is important to strictly maintain the technological parameters of the welding (especially heating and fixing), since they weld quality depends mainly.

It is also important when connecting the heated tubular avoid scar formation (overlap) with the formation of the spot weld, because it It reduces the internal diameter of the pipeline and as a consequence, the additional pressure drop when passing through the working medium fitting.

The welding machine is kept switched on during the entire welding process, the pipeline and off only after completion of all works. When working with a welding machine is important to follow simple safety precautions, or otherwise the chances of burns or fire.

Thus, the welding process is not polypropylene pipes is a very complex technology and is normally held "in one go": easy and convenient. However, in the absence of such a welding experience is desirable for some amount of time to practice before a demanding job, so as not to spoil the case of one inadvertent mistake.

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