Steel welded flat flange of vessels and apparatuses is designed for work in chemical, petrochemical, oil refining and other industries, and is aimed at ensuring the interchangeability and unification of flanges of vessels and apparatuses.
Flanges are manufactured depending on the operating conditions of steel grades st.20, 09G2S, 15X5M or 12X18H10T for nominal diameters from 400 to 2000 mm (DN400 ... DN2000) and are used on heat exchange equipment and pipelines at a nominal pressure of no more than 1.6 MPa ... Working environment temperature from minus 70 ° С to plus 300 ° С. The flange material is selected from the operating conditions in accordance with GOST 28759.1 and must comply with the requirements of the USSR Gosatomenergonadzor Rules and the relevant industry regulatory and technical documentation.
For a flange in accordance with GOST 28759.2, instead of a sleeve, welding of a shell (bottom) with a thickness equal to or greater than the thickness of the sleeve is allowed. It is allowed to weld a sleeve (shell, bottom) with a thickness less than that indicated in the table in cases justified by calculations of the strength and tightness of the flange connection.
Flat welded flanges GOST 28759.2-90 are made of:
- centrifugal electroslag casting (TsEShL),
- production from rolled rings (forgings),
- plasma (laser or gas) cutting from a sheet.
Flat welded flanges of vessels and apparatus are tested for tensile strength, yield strength and impact strength, mechanical properties are determined in accordance with the requirements of the standard.
The products comply with the requirements of the technical regulations of the Customs Union of the EAEU TR CU 032/2013. The products are supplied with quality certificates.
The warranty period for flanges of flat welded vessels and apparatus is 24 months.
