Page 178 - Pressure Vessel Design Manual

156 Pressure Vessel Design Manual

COMBINING STRESSES
WITHOUT REINFORCING PAD
Stress Due To I I I

Longitudinal moment, ML Membrane

Bending

Circumferential moment, M, Membrane

Bending

Internal pressure, P

c
Total
WITH REINFORCING PAD
Stress Due To I I

I I Nx I + I + I + I + I
I Bending I M, 1

Total

NOTES
1. Make sure to remain consistent by lug, that is, that all loadings are from the same lug. This may require several trials to determine the worst case.
2. The calculations for combining stresses with a reinforcing pad should be completed for stresses at the edge of attachment as well as at the edge of the pad. For
thinner shells the stress at the edge of the pad will usually govern.