GOST Flange Standard

What is GOST Flange Standard?

GOST stands for "Gosudarstvennyy Standart," which translates to "State Standard" in English. GOST standards are technical standards developed by the Russian government for various industrial and commercial products.

A GOST standard flange refers to a flange that complies with the specifications outlined in the relevant GOST standard for flanges. Flanges are components used in piping systems to connect pipes, valves, pumps, and other equipment. They provide a means for easy assembly and disassembly of piping components while also facilitating maintenance and inspection.

GOST has several standards related to flanges, such as GOST 12820 and GOST 12821, which cover different types of flanges used in various industries. These standards specify the dimensions, materials, and other technical requirements for flanges to ensure compatibility and interchangeability within the specified applications.

It's important to note that while GOST standards are widely used in Russia and some other countries that were part of the former Soviet Union, other international standards like ANSI, DIN, and ISO are also prevalent in different regions around the world.

GOST 12820 Flange?

This standard covers flat welding flanges with a raised face and a range of pressure ratings. It includes specifications for welding neck, slip-on, and plate flanges. GOST 12820 provides details on flange dimensions, facing types, materials, and tolerances.

GOST 12821 Flange?

GOST 12821 standardizes flat welding flanges with a raised face and a specific range of pressure ratings. Similar to GOST 12820, this standard covers welding neck, slip-on, and plate flanges. GOST 12821 provides detailed information on flange dimensions, facing types, materials, and tolerances.

GOST 33259 Flange?

GOST 33259 is another important standard related to flanges, specifically focusing on steel butt-welded flanges. The full title of this standard is "Flanges for valves, fittings, and pipelines for pressure to PN 250. Design, dimensions and general technical requirements." This standard provides specifications for steel butt-welded flanges that are used in pipelines, valves, and fittings with pressure ratings up to PN 250 (Pressure Nominal 250).

GOST standards cover a variety of flange types, each designed for specific applications within industrial piping systems. The main types of flanges that fall under GOST standards include:

1. Welding Neck Flanges (GOST 12821): These flanges have a long tapered neck that is butt-welded to the pipe. They are commonly used for high-pressure and high-temperature applications.

2. Slip-On Flanges (GOST 12821): Slip-on flanges have a bore slightly larger than the outer diameter of the pipe. They are slipped over the end of the pipe and then welded in place.

3. Plate Flanges (GOST 12820): Plate flanges are flat and typically used for applications with low pressure. They can be easily attached to the end of a pipe.

4. Threaded Flanges (GOST 12821): Threaded flanges have threads on the inner bore and are screwed onto the pipe. They are commonly used for low-pressure applications and in situations where welding is not feasible.

5. Blind Flanges (GOST 12821): Blind flanges are used to close the end of a pipe, providing a solid, flat surface. They are often used to block off a pipeline or to create a pressure vessel.

6. Lapped Joint Flanges (GOST 12821): Lapped joint flanges are similar to slip-on flanges but have a radius at the root of the hub. They are used with a matching stub end for applications requiring quick assembly and disassembly.

7. Orifice Flanges (GOST 12820): Orifice flanges are used in conjunction with orifice meters for measuring the flow rate of liquids and gases.

8. Spectacle Blind Flanges (GOST 12821): Spectacle blind flanges consist of two metal discs attached in the middle with a small viewing hole. They are used to blank off pipelines or vessels temporarily and allow for inspection through the hole.