Shell-to-Torispherical Head Junction Discontinuity Stresses

Discontinuity stresses in shell-to-torispherical head junctions are due to sharp changes in the radius of curvature at points “a” and “2” of Figure 100-7. Since these points are close together, the edge loadings at both locations affect each other to a large degree.

Since the total combined stress in the knuckle region is several times greater than in a standard 2:1 elliptical head under the same internal pressure, torispherical heads are only suitable for low pressure (<150 psi) applications.

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