GOST 12820-80 Flange

Our GOST 12820-80 Flange is produced based on two core GOST standard systems, forming a complete technical system compatible with both traditional Russian and next-generation pipeline specifications:

1. GOST 12820-80: A classic standard specifically for medium and low-pressure steel slip-on flanges, suitable for PN 0.1–2.5MPa, DN10–1600, primarily equipped with RF/FF sealing surfaces, widely used in conventional municipal and general industrial pipelines.

2. GOST 33259-2015: A new universal master standard replacing the old standard, covering all pressure ratings (PN1–250) and all flange types including slip-on, weld neck, loose flange, and blind flange, meeting the needs of high-pressure and diversified projects.

Core Product Parameters

1. Pressure and Diameter Range

- Nominal Pressure (PN): 6 levels (PN0.1, 0.25, 0.6, 1, 1.6, 2.5), covering operating conditions from 0.1 to 2.5 MPa.

- Nominal Diameter (DN): DN10–1600 (½"–64"), matching mainstream industrial piping specifications.

2. Sealing Surface Type

- Standard Type: RF (Raised Face, Type 02) with waterline, roughness Ra≤3.2μm; FF (Flat Face, Type 01) flush with the flange plane.

- Optional Types: MFM (Raised Face), TG (Tongue & Groove), suitable for high-pressure/corrosive environments.

3. Material Selection

Uses mainstream Russian standards and international equivalent materials, conforming to GOST 12816-80 standard:

- Stainless Steel: 08X18H10 (304), 10X17H13M2T (316L), 12X18H10T (321);

- Carbon Steel: St20, St35; Low Alloy Steel: 16Mn.

Production and Quality Assurance

1. Production Control

- Dimensional accuracy, including outer diameter, inner diameter, bolt hole center distance, thickness, and sealing surface height, strictly adheres to standard tables;

- Advanced CNC machining and forging processes ensure stable product performance and high consistency.

2. Quality Inspection

- Full-item inspection: visual inspection, dimensional measurement, and 1.5 times nominal pressure hydrostatic test;

- Complete certification: GOST material certificate, EAC certification, and quality inspection report are provided for each batch.

Flange Type Coverage:

1. 01: Flat-face flange (PL, GOST 12820-80 core type)

2. 02: Socket flange (SO)

3. 03: Loose flange (LJ)

4. 04: Loose butt flange (LJ)

5. 05: Butt flange (WN, conforming to GOST 12821-80)

6. 06: Blind flange (BL)

Customization and Supporting Services:

1. Non-standard customization: Size, material, and sealing surface can be customized according to project drawings;

2. One-stop supply: Provides matching GOST fasteners and seals, simplifying the procurement process and ensuring compatibility;

3. Market adaptability: Products fully comply with Russian and CIS market standards, suitable for long-term projects and foreign trade cooperation.

The DIYE VALVE GOST 12820-80 Flange combines professional manufacturing, standard compliance, and reliable quality, making it the preferred product for low- and medium-pressure pipeline connections in the Russian, CIS, and Central Asian markets. We adhere to the principles of quality first and customer foremost, providing stable supply and technical support to our global partners.

Technical Specifications

FAQs

Q: What are the common core standards for GOST 12820-80 Flanges?

A: GOST 12820-80 is a classic old standard, specialized in medium and low pressure steel slip-on flanges; GOST 33259-2015 is a new version of the general master standard, fully replacing the old system, covering all pressure levels and all types of flanges, and docking with modern Russian enterprises and EAC certification projects.

Q: Can the two standards be replaced and docked with each other?

A: Conventional sizes are compatible, but for high pressure, sealing surface, wall thickness and bolt parameters, GOST 33259-2015 shall prevail; GOST 12820-80 can be used for old equipment maintenance, and the 2015 new standard must be implemented for new construction projects.

Q: How to choose between GOST slip-on flanges and weld neck flanges?

A: GOST 12820-80 slip-on flanges are suitable for normal temperature, medium and low pressure, general water supply and drainage/process pipelines; GOST 33259-2015 weld neck flanges are high temperature and high pressure resistant, anti-vibration, and used for oil and gas, chemical industry, main steam and other high-risk pipelines.

Q: What are the common sealing surface types of GOST 12820-80 Flanges?

A: RF (Raised Face, the most commonly used), FF (Flat Face), MFM (Male-Female Face), TG (Tongue and Groove Face), RJ (Ring Joint Face, high-end configuration of the new standard, dedicated to high temperature and high pressure metal sealing).

Q: What pipelines and bolts are matched with GOST 12820-80 Flanges?

A: It is matched with GOST standard steel pipes and GOST special bolts and nuts. The gaskets are selected from GOST standard rubber gaskets, spiral wound gaskets and metal ring gaskets. The complete set of matching prevents leakage.