Stresses in high-pressure taper-hub flanges with recesses for nut facings

Abstract

Frozen-stress photoelastic analyses were carried out to determine the elastic stresses, due to initial bolting only, set up in a British Standard 250 mm taper-hub flange rated at 250 bar and in 15 different shapes of flange in which recesses were used to reduce the diameter and the peak stresses. It was found that stress concentrations occur at the recess fillets as wel as at the flange fillet. Two shapes were determined which are smaller and lighter and have lower peak stresses than the B.S. shape without recesses.