The GOST 33259-2015 standard is the modern Russian Federation benchmark for steel flanges, replacing older GOST 12820/12821. Type 11 (Weld Neck) is designed for butt-welded connections, offering high structural integrity under extreme temperatures and pressures. Featuring a tapered hub for uniform stress distribution, these flanges are vital in energy and chemical sectors. They utilize various sealing "versions" (A–M) to ensure leak-proof performance in demanding environments.
Technical Attributes: GOST 33259 Type 11
Standard,GOST 33259-2015
Flange Type,Type 11 (Butt-welded / Weld Neck)
Nominal Diameter (DN),10 mm to 4000 mm
Nominal Pressure (PN),1 to 250 bar (0.1 to 25.0 MPa)
Common Materials,"St3sp, 20, 09G2S, 12X18H10T"
Sealing Versions,"A, B (RF), C, D, E, F, L, M"
Raised Face (Type B),Most common execution
Connection Method,Butt-welding to pipe
Temperature Range,-253°C to +600°C (Material dependent)
Manufacturing,"Forging, Stamping, or Rolling"
Stress Distribution,Superior due to tapered hub
Quality Testing,"Ultrasonic, Hardness, Impact tests"
Marking Requirement,"DN, PN, Type, Material, Brand"
Replacement for,GOST 12821-80
Standardization,Harmonized with EN 1092-1
Tolerance Class,Geometry per Table 4-10 of standard
Bore Profile,Matches internal pipe diameter
Applications,High-pressure gas/oil pipelines
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