- Flange typeFlat
flat steel the present standard extends to flanges steel flat welded pipelines and connecting parts, and also to connecting flanges of fittings, connecting parts of cars, devices, branch pipes, devices and tanks.
Technical characteristics of flanges:
Flanges have to be produced with sealing surfaces of executions 1., 2., 3, and connecting sizes in accordance with GOST 12815-80. Production of flanges with sealing surfaces of executions 4 is allowed., 5., 8. and 9. An identification number at the order of a round steel flat welded flange of Dy of 50 mm for Py of 1.0 MPAS (10 kgfs/cm2) from steel 25, execution 1 (with a connecting ledge):
Maximum deviations of the sizes: Dn-on H 14 (when receiving by stamping - on class state standard specification 7505-98) Yu and also produced by method are flexible b-for stamped flanges from strip hire with the subsequent welding of a joint and is hotter a rikhtovka - on GOST 7505-89 T4 accuracy class. At the same time strengthening of a seam which when determining maximum deviation is not considered Flanges flat steel GOST 12822-80 is allowed
The present standard extends to steel flanges of pipelines and connecting parts of cars, branch pipes of devices and tanks, free on a welded ring, on Py from 0.1 to 2.5 MPas (from 1 to 25 kgfs/cm2) and temperature of Wednesday from 243 to 573 To (from minus 30 to plus 300 C).
Rings have to be produced with sealing surfaces of executions 1., 2., 3 and connecting sizes in accordance with GOST 12815-80. Production of rings with sealing surfaces of executions 4, 5, 8 and 9 is where technically justified allowed.