GOST TYPE 12 flange is a solid blind flange defined in GOST 33259-2015. It is used to seal pipeline ends, isolate systems or perform pressure testing. With a solid disc structure, it can withstand high pressure and ensure zero leakage. Our GOST TYPE 12 blind flanges are forged and precisely machined for critical piping systems.
Production Details
Each GOST TYPE 12 flange is manufactured under full-process quality control:
Raw material inspection with mill certificates and spectral analysis
Precision closed-die forging
Controlled heat treatment for stable mechanical properties
High-precision CNC machining for sealing face and bolt holes
100% dimensional inspection using CMM and calibrated gauges
Full NDT: MT, UT testing
Hydrostatic pressure test to verify integrity
Anti-corrosion oil coating and permanent marking
Full material traceability
Product Feature and Application
Key Features
- Fully compliant with GOST 33259-2015 standard dimensions
- Solid disc structure for high pressure bearing capacity
- High strength and excellent sealing performance
- Suitable for pipeline isolation and pressure testing
- High precision and full interchangeability
- Available for low to ultra-high pressure systems
Typical Applications
- Pipeline end closure and isolation
- Pressure testing and commissioning systems
- Oil, gas, petrochemical and power plant pipelines
- High-pressure and critical piping systems
- Russian, CIS and Eastern European engineering projects
| Standard | GOST 33259-2015, TYPE 12 |
| Pressure Rating | PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100 |
| Nominal Diameter | DN 10 – DN 600 |
| Type | Blind Flange |
| Face Type | Type A (FF), Type B (RF), Type C (RTJ) |
| Materials | Carbon steel St20, 09G2S; Alloy steel; Stainless steel 12Х18Н10Т, 10Х17Н13М2Т |
| Working Temperature | −20 °C – 550 °C |
| Certification | EN 10204 3.1 MTC |
Production Display
Our ISO 9001 certified factory is equipped with large-tonnage forging presses, high-rigidity CNC machines and professional NDT laboratories. Third-party inspection by SGS, BV, TÜV is available upon request.
Product Transport Package
- Surface Treatment: Anti-corrosion oil, black paint or varnish
- Packaging: Plastic film, woven bag, export wooden case, steel pallet
- Labeling: Size, pressure, material, standard, heat number, batch
- Documents: Commercial invoice, packing list, certificate of origin, material test certificate
- Transportation: Sea, land and express delivery to global markets
After-sales Service
We provide full life-cycle technical support for GOST TYPE 12 FLANGE:
- Professional consultation on selection, welding and installation
- Custom sizes, materials and drilling per customer drawings
- Timely response to after-sales inquiries and quality claims
- Remote technical guidance and on-site support
- Stable long-term supply for large-scale projects
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