Socket welding
If the diameter of the pipeline in the network is more than 63 mm, butt welding is usually used. It is produced by a special tool without the use of additional fittings. To connect large diameter pipes to each other, taking into account the fact that the assembly will be dismountable, it is assumed that there is a flange joint.
In order to obtain a connection that does not involve a connector, socket fusion is used. For its implementation, special soldering irons are used, the nozzles of which are sprayed from non-stick material( for example, Teflon).Before connecting polypropylene pipes, it is necessary to wipe the nozzles with a tarpaulin or clean it with a special wooden scraper. It should be remembered that you need to clean before each soldering process and do it only when they are in a hot state.
Sequence of connecting pipes with this apparatus is as follows:
- Installing the device on a flat surface and fixing it
- Selecting and installing nozzles
- Heating the soldering iron for 10-15 minutes to a temperature of 260 degrees
- Cutting the length of the pipe with a scissors or pipe cutter
- Cleaningfitting and piping edges
- Heating both pipes and fittings at the same time
- Docking of parts in one motion
- Cooling of the
connection Very important in this process is the abolitionit selling heating temperature. If they can not withstand a sufficient amount of time on the heating element, the polymer will not reach the plastic boundary and docking will not occur. On the contrary, if you overheat it, the edges of the products will become too viscous and can not be joined. Therefore, before connecting polypropylene pipes by fusion welding, it is necessary to take care of the presence in the workplace of tables in which the time of heating of products with a particular wall thickness, diameter, is indicated.
Joints of pipes reinforced with foil
When forming joints for such pipes, there are certain specific features. For example, a unique shaver device is used, which removes the upper layer of polymer and aluminum from the pipeline. The fitting is of such a size that only the pipes without tops can fit into it. It is recommended to use equipment, parts and fittings, which are manufactured by one manufacturer, to simplify their installation.
When connecting polymeric piping, it is worth remembering that their fittings should not be damaged or deformed in any way, the difference in axial relationship between them is allowed no more than by the thickness of the wall of the pipe itself, and also near the edge of the fittinghomogeneous layer of fused polymer.
If the polypropylene sections of the network need to be attached to the metal, most often use threaded connections using the appropriate fittings. A flange connection is also quite common: welded bushings for flanges are welded to the pipe, or metal hangers are used. In order to seal the joints, apply sealing pastes, as well as Teflon yarn and tape.
