FLANGE GOST 12821-80
The steel butt weld ("collar flange") according to GOST 12821-80 is applicable at temperatures from -253 to 600 ° C and pressures up to 200 kgf/cm2.
This standard applies to steel welded flanges of pipelines and connecting parts, as well as to the connecting flanges of fittings, connecting parts of machines, devices, nozzles, apparatuses and tanks for a nominal pressure of 0.1 to 20.0 MPa (from 1 to 200 kgf/cm2) and ambient temperature from 20 to 873 K (from minus 253 up to plus 600 ° C).
GOST 12821-80 collar flanges are manufactured with sealing surfaces 1 (except for flanges Ru 10.0; 16.0; 20.0 MPa) 2, 3, 4, 5, 6, 7, 8, 9 and the connecting dimensions according to GOST 12815-80.
FEATURES OF MOUNTING COLLAR FLANGES GOST 12821-80
GOST 12821-80 flanges are welded butt-to-butt