Gost Standard Flange

Gost Standard Flange Introduction,all you need to know about Gost flanges

The GOST (“Gosudarstvennyy Standart”)  a standard that specifies the products meet Russia’s national standards

Fanges made according to Gost standard are widely used in Russia and other countries especially in regions where GOST compliance is required, such as Eastern Europe, and CIS countries. In this article,you would learn more details about the gost standards for flanges

GOST Flange Types

GOST 12821

Gost 12821 specifies the Steel butt – welded flanges (Weld neck flanges) for Pressure from 0.1 to 20.0 MPa (from 1 to 200 kgf/cm²). Design and dimensions,tolerance etc.

Download GOST 12821 pdf here..

  • Type: Weld neck flanges.(Steel butt – welded flanges )
  • Applications: Used for high-pressure systems, where secure and robust connections are required.
  • Design: Typically features a long tapered hub to provide structural reinforcement and reduce stress concentration.
  • Pressure Range: PN 2.5 to PN 250.
  • Material:
  • Carbon steel :СТ20; СТ.3, 09Т2С
  • Stainless steel:12Х18Н10Т; 10Х17Н13М2Т,ASTM A182 F304L, F316/316L, F316H, F310, F321 F44
  • Alloy steel:ASTM A182 F1, F5a, F9, F11, F12, F22, F91,15Х5М
  • Dimension: download GOST 12821 flange dimensions
GOST 12821 Weld neck Flanges

GOST 12820

GOST 12820 is the standard for Steel plane welded flanges, Pressure from 0.1 to 20.0 MPa (from 1 to 200 kgf/cm²). Design and dimensions,tolerance etc. down load GOST 12820 pdf

  • Type: Flat flanges (slip-on type).
  • Applications: Low-pressure systems and environments with minimal mechanical stress.
  • Design Features: Designed for easy installation and alignment; requires fillet welding.
  • Materials: 
  • Carbon steel :СТ20; СТ.3, 09Т2С
  • Stainless steel:12Х18Н10Т; 10Х17Н13М2Т,ASTM A182 F304L, F316/316L, F316H, F310, F321 F44
  • Alloy steel:ASTM A182 F1, F5a, F9, F11, F12, F22, F91,15Х5М
  • Dimension: download GOST 12820 flange dimensions
GOST 12820 Steel plane welded flanges

GOST 12836-67

GOST 12836-67 Steel raised face plugs for flanges(Blind Flange) for Pressure from 1 to 40 kgf/cm2. Design, dimensions and technical requirements

  • Type: Steel raised face plugs (Blind flanges Raise face )
  • Applications: Used for high-pressure systems, where secure and robust connections are required..
  • Pressure Range: PN 2.5 to PN 250.
  • Material:
  • Carbon steel :СТ20; СТ.3, 09Т2С
  • Stainless steel:12Х18Н10Т; 10Х17Н13М2Т,ASTM A182 F304L, F316/316L, F316H, F310, F321 F44
  • Alloy steel:ASTM A182 F1, F5a, F9, F11, F12, F22, F91,15Х5М
  • Dimension: download GOST 12836 Blind flange dimension and weight
GOST 12836-67 Blind flanges

GOST 33259

GOST 33259-2015. Flanges for valves, fittings and pipelines for pressure to PN 250. Design, dimensions and general technical requirements

  • Type: General-purpose flanges for pipelines.
  • Applications: Low to medium pressure systems such as water supply, gas distribution, and heating systems.
  • Flange Types Covered
  • Type 01: Plate/flat-face flanges
  • Type 11: Weld-neck (butt-weld flanges) (GOST 12821-80)
  • Slip-on & Socket-weld: Smooth bore and reinforced hubs
  • Lap-joint: Companion flanges for stub-end connections
  • Blind: plug for pipeline isolation (GOST 12836-67)
  • Spectacle-blind, Spade & Spacer: Dual-plate and two-piece isolation devices
  • Pressure Range: pressure PN 6–250
  • Materials:
  • Carbon steel :СТ20; СТ.3, 09Т2С
  • Stainless steel:12Х18Н10Т; 10Х17Н13М2Т,ASTM A182 F304L, F316/316L, F316H, F310, F321 F44
  • Alloy steel:ASTM A182 F1, F5a, F9, F11, F12, F22, F91,15Х5М

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