GOST 12821-80 Steel butt welded flange,weld neck flanges
GOST 12821-80 is a Russian standard that defines the dimensions and technical requirements for steel butt-welded flanges used in high-pressure piping systems.
Pressure ratings:
PN 0.6 to PN 20.0 MPa (6 to 200 kgf/cm²)
Nominal diameter (DN):
Typically DN 10 to DN 1600
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