GOST TYPE 01 flange is a flat plate welded flange defined in GOST 33259-2015, replacing the old GOST 12820-80 standard. It is a single plate steel flange that slides over the pipe and is fillet welded, widely used for low-to-medium pressure pipelines in water supply, heating, gas, general industry and construction systems. Our GOST TYPE 01 flanges are precisely forged and CNC machined to meet standard dimensions, ensuring stable sealing and reliable service.
Production Details
Each GOST TYPE 01 flange is manufactured under strict quality control:
Raw material inspection with mill certificates and spectral analysis
Precision plate cutting or forging per GOST standard
CNC machining for accurate OD, PCD, bolt holes and facing
100% dimensional inspection using calibrated gauges and CMM
Visual inspection for surface defects and finish
Anti-corrosion oil coating and permanent marking
Full material traceability from raw material to finished product
Product Feature and Application
Key Features
- Fully compliant with GOST 33259-2015 standard dimensions
- Flat plate structure for economical and convenient installation
- High precision and good interchangeability with GOST valves and fittings
- Smooth welding surface for strong and reliable connection
- Suitable for low-medium pressure and non-toxic fluid systems
- Available in FF and RF sealing faces to meet different demands
- Complete size range from DN10 to DN2400
Typical Applications
- Municipal water supply and heating pipelines
- Gas, ventilation and utility piping systems
- Construction and civil engineering pipe connections
- General industrial low-pressure fluid lines
- Petrochemical auxiliary and non-critical piping
- Russian, CIS and Eastern European standard projects
| Standard | GOST 33259-2015, TYPE 01 |
| Pressure rating | PN 1, PN 2.5, PN 6, PN 10, PN 16, PN 25 |
| Nominal diameter | DN 10 – DN 2400 |
| Type | Flat Plate Welded Flange (Slip-on) |
| Face type | Type A (Flat Face FF), Type B (Raised Face RF) |
| Materials | Carbon steel St20, St3sp; Stainless steel 12Х18Н10Т, 10Х17Н13М2Т |
| Working temperature | −20 °C – 300 °C |
| Certification | EN 10204 3.1 Material Test Certificate |
Production Display
Our ISO 9001 certified factory is equipped with full sets of plate processing, CNC machining and testing equipment. The whole production process is traceable. 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 01 flanges:
- 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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