GOST Flange
GOST Flange
GOST flanges are a type of pipe flange manufactured in accordance with the GOST (Gosudarstvennyy Standart) standards, which are the Russian national standards. These flanges are widely used in various industries, especially in regions where GOST compliance is required, such as Russia, Eastern Europe, and CIS countries.
GOST Flange Types
GOST 12821
- Type: Weld neck 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.
- Materials: Carbon steel, alloy steel, stainless steel, and other materials suitable for different pressure and temperature conditions.
GOST 33259
- Type: General-purpose flanges for pipelines.
- Applications: Low to medium pressure systems such as water supply, gas distribution, and heating systems.
- Compatibility: Includes a variety of flanges like flat, slip-on, and weld neck, conforming to various connection types.
- Pressure Range: PN 0.1 to PN 40.
- Materials: Versatile material options based on operating conditions, including steels and non-metallic options.
GOST 12815
- Type: Flanges with sealing surfaces for pressure-tight connections.
- Applications: Commonly used in pipelines requiring specific sealing surfaces, including chemical, petroleum, and gas industries.
- Sealing Face Types: Includes flat face, raised face, and groove face.
- Pressure Range: PN 0.1 to PN 250.
- Materials: Wide range of materials to suit aggressive and non-aggressive media.
GOST 12820
- 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.
- Pressure Range: PN 0.1 to PN 40.
- Materials: Suitable for non-corrosive and slightly corrosive environments; commonly made of carbon steel or stainless steel.
Key Characteristics of GOST Flanges:
- Pressure Ratings: Ranges from low pressure (PN 0.1) to high pressure (PN 250).
- Materials: Diverse materials, including carbon steel, stainless steel, alloy steel, and non-metallic options.
- Seal Types: Flat face, raised face, tongue & groove, and ring-type joint sealing surfaces.
- Applications: From water distribution to high-pressure chemical processing pipelines.
High-Temperature Applications
- Industries: Power plants, petrochemical plants, and refineries.
- Conditions: Suitable for pipelines and systems handling steam, hot gases, or high-temperature fluids.
- Material Choice: Often made of high-grade alloys like stainless steel or alloy steel (e.g., A182 F11, F22) to withstand extreme temperatures.
Low-Temperature Applications
- Industries: LNG processing, cryogenic systems, and cold storage facilities.
- Conditions: Designed to function in sub-zero environments where materials need exceptional toughness and flexibility.
- Material Choice: Low-temperature carbon steels (LTCS) like ASTM A350 LF2 or stainless steel grades with excellent cryogenic properties.
Materials
GOST flanges are available in a wide range of materials to suit different operational needs:
- Carbon Steel: Cost-effective and suitable for moderate pressure and temperature conditions.
- Stainless Steel: Resistant to corrosion and ideal for aggressive environments.
- Alloy Steel: High strength and durability for demanding applications.
- Nickel Alloys: For handling highly corrosive or high-temperature fluids.
- Duplex and Super Duplex Stainless Steel: Excellent strength and corrosion resistance.
Flange Face Types
The flange face type impacts the sealing performance and is selected based on the application and gasket type:
Flat Face (FF)
- Common in low-pressure systems.
- Ensures even contact between flange and gasket.
Raised Face (RF)
- Most commonly used face type.
- Designed to concentrate pressure on the gasket for a better seal.
Ring Type Joint (RTJ)
- For high-pressure and high-temperature applications.
- Uses a metal ring for sealing, ensuring leak-proof connections.
Tongue and Groove (T&G)
- Ideal for systems with repetitive disassembly and assembly.
- Ensures precise alignment and excellent sealing.
Male and Female (M&F)
- Provides an interlocking design for better gasket alignment.
- Suitable for high-pressure systems.
GOST 12820-80 PVC Flanges
GOST33259-11/12821-80 Welding Neck Flange
GOST33259-01/12820-80 Plate Flange
