Installation of trunk pipelines is not only very difficult, but also extremely responsible. After all, if the workers, as they say, cheat and poorly perform the connection on a particular site, then an accident on the pipeline cannot be avoided. And accidents on trunk communications inevitably entail the most serious consequences. So both the choice of mounting materials and their installation must be approached very responsibly.

Flanges are the most common mounting elements

Today, so-called flanges are used to seal pipelines. Flange – connections of pipes of various diameters, made of high-quality low-alloy or carbon steel. This mounting element is installed by welding, which, in turn, is carried out by inverter or semi-automatic welding equipment. Since the flange is mounted on the pipeline by welding, it is called welded.

To make welding easier, there are provided on the body of the product itself:

- special contour seams, which are used for welding;

- areas with tin-treated steel. When heated, the tin melts and provides a more reliable sealing of the welds;

- special recesses that allow welding from the inside of the product – again, to improve sealing.

Advantages of flanges

High-quality flanges are distinguished by their unique resistance to deformation effects. The fact is that the pressure of the working medium inside large trunk pipelines is very high and can reach 20 Bar. At this pressure, both the pipe itself and the components used in its laying must have a huge margin of safety. Inexpensive brass and polypropylene flange connections cannot withstand such pressure and fail within a few weeks after installation. Metal welded joints, on the contrary, do not deform under the pressure of the working medium. They retain their strength even in cases when there is an emergency increase in pressure up to 30 Bar and above.

Other significant advantages of welded flanges are:

- corrosion resistance;

- a wide variety of standard sizes available to customers;

- resistance to abrasive damage by sand particles, which are often contained in water and in gas transported through the pipeline.

Prices for flanges depend on the grade of steel from which they are made, on their standard sizes and some other design features of a particular product. bitqt