Steel flanges

Flat welded flanges by their design and purpose are the simplest, they are flat rings welded to the edge of the shell or pipe along its perimeter. These flanges are put on the pipe and welded in a circle. Along the edges of the flange there are holes that serve to connect the flange to the valve by means of bolts and studs.

A flat flange, depending on the operating conditions, can be made of steel grades st.20, 09G2S or 12X18H10T for nominal diameters from 15 to 1200 mm (DN15 ... more than 2.5 MPa. The environment is not aggressive, the temperature of the working environment is from -40 ° C to 300 ° C.

Flat welded flanges are made of:

• closed die stamping of flanges,
• forging on a backing ring (stamping),
• centrifugal electroslag casting (TsEShL),
• production from rolled rings (forgings),
• plasma (laser or gas) cutting from a sheet.

Flat welded flanges are tested for tensile strength, yield strength and impact strength, mechanical properties are determined that comply with 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 butt weld steel flanges is 24 months.

Butt-welded collar flanges have increased rigidity and strength, are used for a more reliable method of attachment to a pipeline with high and overpressure, as well as for connection to shut-off and control valves, measuring instruments, welded pipes, vessels and apparatus, reservoirs in heat supply, water supply , oil and gas and chemical sectors. Working environment temperature from -253 ° С to + 600 ° С.

Butt-weld fastening, allows to achieve high strength and tightness of the joint with one joint seam.

The butt-welded flange, depending on the operating conditions, is made of steel grades st.20, 09G2S, 15X5M, 13XFA or 12X18H10T for nominal diameters from 15 to 1400 mm (DN15 ... DN1400) and can be used on equipment and pipelines at a nominal pressure not more than 25.0 MPa.

Butt weld flanges are made of:

• closed die stamping of flanges,
• forging on a backing ring (stamping),
• centrifugal electroslag casting (TsEShL),
• production from rolled rings (forgings),
• plasma (laser or gas) cutting from a sheet.

Butt weld flanges are tested for tensile strength, yield strength and impact strength, and mechanical properties are determined that comply with 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 butt weld steel flanges is 24 months.

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.

Flanges in accordance with GOST 28759.3-90 are steel butt-welded flanges for vessels and apparatus, which are produced by the Plant of Annular Billets with an inner diameter of 400 to 2000 mm (DN 400 DN 2000 mm) and with a nominal pressure of 0.6 to 6.3 MPa ... Flanges are designed for the installation and repair of tanks, vessels and apparatus, tanks, cracking columns, heating and water supply devices at a working environment temperature from minus 70 ° C to plus 540 ° C, in the chemical, petrochemical, oil refining and other industries.

The use of flanges of vessels and apparatus makes it possible to disassemble containers and reservoirs for preventive maintenance, replacement of filter elements, repair and technical inspection.

Steel butt-welded flanges of vessels and apparatuses GOST 28759.3-90 are made of:

• centrifugal electroslag casting (TsEShL),
• production from rolled rings (forgings),
• plasma (laser or gas) cutting from a sheet.

Butt-welded steel 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 butt-welded steel flanges for vessels and apparatus is 24 months.

Flanges in accordance with GOST 28759.4-90 are steel butt-welded flanges for vessels and apparatuses for an octagonal gasket. Flanges in accordance with GOST 28759.4-90 withstand pressure from 6.3 MPa to 16.0 MPa, and their diameter is from 400 mm to 1600 mm. The operating temperature at which flanges are used in accordance with GOST 28759.4-90 varies from minus 70 ° С to plus 540 ° С.

Flanges for an octagonal gasket in accordance with GOST 28759.4-90 can be made of:

• centrifugal electroslag casting, TsEShL;
• production from rolled rings, forgings;
• plasma, laser or gas cutting from sheet.

Steel butt-welded flanges for vessels and apparatus for an octagonal gasket 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 steel butt-welded flanges for vessels and apparatus for an octagonal gasket is 24 months.

ASME / ANSI flanges (ASME - American Society of Mechanical Engineers - American Society of Mechanical Engineers, American National Standards Institute) are manufactured according to ASME / ANSI B16.5 - 1996 - "Pipe Flanges and Flanged Fittings" with conditional diameters from 1/2 to 24 inches.

These standards describe the modes of temperature and pressure, materials, dimensions, tolerances, markings, etc. In accordance with the specified standards, according to the nominal pressure, the flanges are divided into classes (Class, allowable nominal pressure in psi): 150, 300, 400, 600, 900, 1500, and 2500. To convert from units of "class" to kgf / cm², it is necessary to divide the value of "class" by 6. Also, this standard includes recommendations and requirements for flange connections, namely, flange fasteners, and gaskets for flanges.

The ring billet plant produces flat steel flanges according to ASME B16.5 in Slip on (SO) Flanges and Lap Joint Flanges, and ASME steel butt weld (neck) flanges in Welding Neck.

To adapt the use of imported pipe fittings to Russian pipes made according to GOST, in the face of increased demand, the Ring Billet Plant develops and manufactures steel flanges in which the sealing surface is made according to ASME, DIN or EN standards (like ASME flanges, DIN flanges or flanges EN, respectively), and the welded part - for a domestic pipe in accordance with GOST (as with a butt-welded collar flange in accordance with GOST 33259-2015).

Flanges are tested for tensile strength, yield strength and impact strength, and mechanical properties are determined. The products comply with the requirements of the technical regulations of the Customs Union of the EAEU TR CU 032/2013, supplied with quality certificates.

The warranty period for flanges is 24 months.

It is possible to buy or find out the price for inch and metric ASME / ANSI B16.5 flanges at the Ring Billet Plant.

ASME / ANSI flanges (ASME - American Society of Mechanical Engineers, American National Standards Institute) large diameters from 26 to 60 inches are manufactured according to ASME / ANSI B16.47 "Large Diameter Steel Flange ".

These standards describe the modes of temperature and pressure, materials, dimensions, tolerances, markings, etc. In accordance with the specified standards, according to the nominal pressure, the flanges are divided into classes (Class, allowable nominal pressure in psi): 150, 300, 400, 600, 900, 1500, and 2500. To convert from units of "class" to kgf / cm², it is necessary to divide the value of "class" by 6. Also, this standard includes recommendations and requirements for flange connections, namely, flange fasteners, and gaskets for flanges.

The ring billet factory produces steel butt weld flanges according to ASME B16.47 with Welding Neck execution.

To adapt the use of imported pipeline fittings to Russian pipes made according to GOST, in the face of increased demand, the Ring Billet Plant develops and manufactures steel flanges, in which the sealing surface is made according to ASME, DIN or EN standards (like ASME flanges, DIN flanges or flanges EN, respectively), and the welded part - for a domestic pipe (like a butt-welded collar flange in accordance with GOST 33259-2015).

Flanges are tested for tensile strength, yield strength and impact strength, and mechanical properties are determined. The products comply with the requirements of the technical regulations of the Customs Union of the EAEU TR CU 032/2013, supplied with quality certificates.

The warranty period for flanges is 24 months.

It is possible to buy or find out the price for inch and metric ASME / ANSI B16.47 flanges at the Ring Billet Plant.

Steel flanges according to DIN EN 1092-1 are manufactured according to European standards established by the German Institute for Standardization (DIN - Deutsches Institut für Normung) and the European Committee for Standardization (EN - European Committee for Standardization).

The DIN EN 1092-1 standard specifies the requirements for flanges and their connections for pipes, valves, fittings, etc., designed for a pressure of PN 2.5–40.0 MPa and a nominal diameter of DN 10–4000 mm. The standard specifies types, sizes, materials, tolerances, threads, surface treatments, flange markings, weights, bolt sizes and pressure versus temperature.

Structurally, steel flanges according to DIN EN 1092-1 are similar to flanges according to domestic standards and have the same types of sealing surfaces, however, there are some differences in the geometric dimensions of the products. The ranges of permissible pressures for different diameters also differ. The dimensions of the sealing surfaces, as well as the height of the protrusion, the diameter, and the depth of the cavity, are not identical to domestic standards. Therefore, the EN 1092-1 flange does not have an analogue of GOST.

The ring billet plant produces steel flanges DIN EN 1092-1 type 01 flat welded flange and 11 welded flange, nominal diameter from DN 400 to DN 1400 and pressure from PN 2.5 to PN 25.0 MPa from various steel grades. It is also possible to design and manufacture transitional and non-standard flanges according to your drawings and in accordance with technical requirements.

Flanges are tested for tensile strength, yield strength and impact strength, and mechanical properties are determined. The products comply with the requirements of the technical regulations of the Customs Union of the EAEU TR CU 032/2013, supplied with quality certificates.

The warranty period for flanges is 24 months.

It is possible to buy or find out the price for steel flanges according to DIN EN 1092-1 at the Ring Billet Plant.

During operation, the flanges withstand the maximum load, ensuring the stable operation of pipeline assemblies and oil and gas equipment in the chemical, petrochemical and related industries under conditions of static and repeated static loads, high pressure, negative and high temperatures. Therefore, the requirements for the quality of the steel billet of flanges are increased, quality control is carried out at all stages: preparation of materials, manufacturing of semi-finished products, control of the chemical composition, heat treatment, control of metal continuity by ultrasonic flaw detection, as well as testing the hardness and mechanical properties of products in the central factory laboratory (TsZL ) Plant of ring blanks.

The main methods for obtaining a flange blank are:

• stamping of flanges in closed dies;
• forging on a backing ring (stamping);
• centrifugal electroslag casting (TsEShL);
• production from rolled rings, forgings;
• plasma or flame cutting from a sheet.

The use of the above methods makes it possible to obtain high-quality blanks of flanges from carbon, alloy, heat-resistant and stainless steel grades:

• weighing up to 2000 kg;
• inner diameter from 150 mm to 2000 mm;
• outside diameters from 240 mm to 2300 mm.
• with quality control according to group IV GOST 8479-70, GOST 25054-81.