GOST 28759.2-90 Steel Flat Welded Flanges for Vessels and Apparatus
GOST 28759.2-90 Steel Flat Welded Flanges for Vessels and Apparatuse are industrial flange components designed for vessels, pressure equipment and process apparatus operating under medium and high-pressure conditions.
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.
Manufactured according to the Russian GOST 28759.2-90 standard, these flat welded flanges are widely used in:
- pressure vessels
- chemical processing equipment
- storage tanks
- heat exchangers
- petrochemical plants
- oil & gas systems
- industrial process piping
GOST 28759.2-90 flanges provide:
- reliable welded connections
- good sealing performance
- excellent structural strength
- compatibility with Russian and CIS industrial equipment
We are a professional manufacturer and exporter of:
- GOST 28759.2-90 Flat Welded Flanges
- Russian Standard Vessel Flanges
- Steel Flanges for Apparatus
- Pressure Vessel Welded Flanges
- GOST Steel Forged Flanges
in China.
What is GOST 28759.2-90 Flange?
GOST 28759.2-90 is the Russian standard covering:
- steel flat welded flanges
- flanges for vessels and apparatus
- pressure equipment flange connections
These flanges are designed for:
- welded pressure vessel connections
- industrial process systems
- chemical and petrochemical equipment
Flat welded flanges are connected to vessels or piping systems through:
- fillet welding
- butt welding
- structural welding connections
The design provides:
- easy installation
- strong mechanical performance
- stable sealing capability
Applications of GOST 28759.2-90 Flanges
GOST 28759.2-90 steel flat welded flanges are widely used in:
Pressure Vessels
Used for:
- vessel nozzles
- pressure tank connections
- industrial reactors
Petrochemical Plants
Applied in:
- refinery systems
- process equipment
- chemical piping
Heat Exchangers
Suitable for:
- shell connections
- thermal equipment systems
Oil & Gas Industry
Used in:
- pipeline equipment
- separator vessels
- process systems
Industrial Apparatus
Applied in:
- mixing tanks
- filtration equipment
- industrial machinery
GOST 28759.2-90 Flange Specifications
| Specification | Details |
|---|---|
| Standard | GOST 28759.2-90 |
| Product Type | Steel Flat Welded Flange |
| Application | Vessels & Apparatus |
| Connection Type | Welded |
| Manufacturing Method | Forged / Rolled / Machined |
| Pressure Rating | PN 6 – PN 160 |
| Size Range | DN10 – DN2000 |
Russian Material Grades for GOST Flanges
GOST 28759.2-90 flanges can be manufactured from various Russian carbon steel, alloy steel and stainless steel grades.
Carbon Steel Grades
| Russian Grade | Equivalent ASTM / EN |
|---|---|
| 20 | ASTM A105 / C22.8 |
| 09G2S | ASTM A350 LF2 |
| 16GS | Pressure Vessel Carbon Steel |
| 20K | Boiler & Pressure Vessel Steel |
| St20 | Carbon Structural Steel |
| St3sp / St3ps | Mild Carbon Steel |
Low Alloy Steel Grades
| Russian Grade | Approximate Equivalent |
|---|---|
| 12Х1МФ | ASTM A182 F11 |
| 15Х5М | ASTM A182 F5 |
| 10Г2 | Low Alloy Structural Steel |
| 30ХМА | Alloy Structural Steel |
Stainless Steel Grades
| Russian Grade | Equivalent ASTM |
|---|---|
| 12Х18Н10Т | ASTM A182 F321 |
| 08Х18Н10 | ASTM A182 F304 |
| 03Х17Н14М3 | ASTM A182 F316L |
| 10Х17Н13М2Т | ASTM A182 F316Ti |
Advantages of GOST 28759.2-90 Flat Welded Flanges
Reliable Welding Performance
Suitable for:
- vessel fabrication
- industrial process systems
Good Sealing Capability
Provides:
- stable flange connection
- reliable gasket sealing
Strong Mechanical Strength
Designed for:
- pressure equipment
- industrial apparatus
Wide Material Availability
Available in:
- Russian carbon steel grades
- low alloy steel grades
- stainless steel grades
- duplex stainless steel grades
Manufacturing Process of GOST Flanges
Typical manufacturing process includes:
- forging
- plate cutting
- rolling
- heat treatment
- CNC machining
- drilling
- dimensional inspection
Strict quality control ensures:
- flange flatness
- dimensional accuracy
- welding reliability
Heat Treatment
Depending on material grade, flanges may be supplied in:
- normalized condition
- quenched and tempered condition
- solution annealed condition
Heat treatment improves:
- toughness
- mechanical strength
- pressure resistance
Pressure Ratings and Sizes
GOST 28759.2-90 flanges are available in:
- PN6
- PN10
- PN16
- PN25
- PN40
- PN63
- PN100
- PN160
Size range:
- DN10 – DN2000
Custom dimensions can also be manufactured according to:
- vessel drawings
- project specifications
- OEM requirements
Surface Protection Options
Flanges can be supplied with:
- anti-rust oil
- black painting
- galvanized coating
- phosphating
- industrial protective coatings
Surface protection depends on:
- storage conditions
- operating environment
- export requirements
Inspection and Testing
GOST 28759.2-90 flanges may undergo:
- chemical composition analysis
- mechanical testing
- hardness testing
- dimensional inspection
- ultrasonic testing (UT)
- magnetic particle testing (MT)
- PMI testing
Third-party inspection available from:
- SGS
- BV
- TUV
- DNV
- ABS
Certificates available:
- EN 10204 3.1
- EN 10204 3.2 upon request
GOST Flanges vs ASME Flanges
| Property | GOST Flange | ASME Flange |
|---|---|---|
| Standard System | Russian / CIS | American |
| Main Application | Vessels & Apparatus | Piping Systems |
| Design Standard | GOST | ASME B16.5 |
| Industrial Use | CIS / Russia | International |
GOST flanges are commonly required for:
- Russian industrial projects
- CIS equipment systems
- Eastern European process plants
Welding and Installation
Flat welded flanges are typically installed using:
- fillet welding
- vessel nozzle welding
- structural welding procedures
Proper welding procedures help ensure:
- leak-free sealing
- structural integrity
- long service life
Corrosion Resistance Options
For corrosive service environments, available materials include:
- stainless steel
- duplex stainless steel
- nickel alloys
Optional corrosion-resistant coatings are also available.
Typical Industries Using GOST 28759.2-90 Flanges
Chemical Industry
Used in:
- reactors
- storage vessels
- chemical process systems
Petrochemical Industry
Applied in:
- refinery units
- processing equipment
Power Generation
Used for:
- pressure equipment
- utility systems
Oil & Gas Industry
Suitable for:
- pressure vessels
- separator systems
- process piping
Frequently Asked Questions
What is GOST 28759.2-90?
It is the Russian standard for steel flat welded flanges used for vessels and apparatus.
What are common Russian material grades for GOST flanges?
Common grades include:
- 20
- 09G2S
- 16GS
- 12Х18Н10Т
- 08Х18Н10
- 03Х17Н14М3
Are GOST flanges available in stainless steel?
Yes. Stainless steel and duplex stainless steel materials are available.
Can GOST flanges be custom manufactured?
Yes. Custom dimensions and drilling can be produced according to drawings.
Are GOST flanges suitable for pressure vessels?
Yes. These flanges are specifically designed for vessel and apparatus applications.
Related Products
- ASME B16.5 Weld Neck Flanges
- DIN Vessel Flanges
- EN1092-1 Flanges
GOST 28759.2 Flat Welding Flange
Why Choose Our GOST 28759.2-90 Flanges?
We provide:
- forged and plate flanges
- Russian standard manufacturing
- Russian material grades
- custom machining service
- strict dimensional inspection
- EN 10204 3.1 certification
- export seaworthy packing
- worldwide project delivery
Our GOST 28759.2-90 steel flat welded flanges are manufactured for reliable vessel and industrial apparatus applications.
