Modern industry produces pipes of various diameters, which are used in various fields. Small and medium diameter metal products are used in homes in most cities. A large-diameter products are most often used in public utilities and trunk oil and gas pipelines. The choice of a pipe of a specific diameter depends both on the goals of the pipeline and on its length and operating conditions.
Kinds
Currently, steel pipes of large diameter are separated by the method of their production. There are single-seam, which are made of steel sheet by contact welding. They have a diameter of 114 to 530 mm.
The second type of pipe is called spiral seam. They are made of metal by electric arc welding. The name gives an idea of how the seam is located, thanks to which the final product is obtained. The diameter of such products ranges from 159-820 mm.
The third type includes the largest - with a diameter of 530 to 1420 mm. They are manufactured by industry with one longitudinal straight seam, which is done by electric arc welding.
Also, in industrial production, edges can be trimmed - trimming and deburring. In this case, pipes can also be produced without edge treatment.
Application
The use of certain materials is laid at the design stage of various objects. So when constructing trunk pipelines for hydrocarbons, they try to use large diameter pipes. A 1420 mm pipe allows you to create the necessary flow of raw materials in such a pipeline, and, therefore, the mining organization will not let its buyer down. Designers expect similar indicators from pipes of smaller diameter - 900, 920 or 1020 mm.
In settlements, the construction of pipelines through which raw materials are transported is better suited or 1200 mm. This is due to the fact that such pipes are more compact and do not stand out much against the background of the city landscape (with an external pipeline), and with an underground method of laying, a pit of smaller depth is needed (therefore, less labor is required to tear out and fill the pits).
Also in settlements, a steel pipe 920x12 or 1000 mm can be used in housing and communal services (water supply, sewage). For example, about replacing 920x12 cast iron pipes with steel pipes, it is well written here .
There are still more pluses, even minus the costs of digging, backfilling pits, the salaries of workers, design work. Their cost is lower than that of cast iron. But the service life of steel pipes is lower than that of cast iron counterparts. But steel is stronger than cast iron - they are not afraid of impacts, and therefore, are less damaged during transportation and loading and unloading operations. Another advantage of steel products over cast iron in the housing and communal services system is its high resistance to aggressive environments.