Specifies materials, dimensions and marking for forged carbon steel slip-on welding and welding neck flanges, of nominal size 26 in to 48 in for Classes 150,300, 400 and 600.
BS 3293:1960 history
0000 BS 3293:1960(2011)
1960BS 3293:1960 Specification for carbon steel pipe flanges (over 24 inches nominal size) for the petroleum industry