GOST33259-2015 is Russian flanges stadnard, GOST33259-2015 have instead of old flanges norm of GOST12820-80 and GOST12821-80, flanges pressure PN6 PN10 PN16 PN25 PN40, flanges type plate flange, blind flange, welding neck flange, flanges made by forging, flat flanges and blind flanges, welding neck flanges.
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