...Two types of initial geometric imperfections, outer diameter out-of-roundness and outer-to-inner diameter eccentricity with a phase angle between them, can be considered.
CPVparametric.xlsm, does parametric analyses. It plots performance parameters against depth or pressure for up to five different combinations of materials and shell geometries including initial imperfections.
CPVcreep.xlsm does analysis of creep instability in vessels with initial mode-2 out-of-roundness imperfections.
Supporting documentation is included.