but not less than 0.20 for forged circular and noncircular heads integral with or butt welded to the vessel, where the flange thickness is not less than the shell thickness, the corner radius on the inside is not less than the following
but not less than 0.20 forforged circular and noncircular heads integral with or buttwelded to the vessel, where the flange thickness is not lessthan the shell thickness, the corner radius on the inside isnot less than the following