The seismic analysis of ASME Section VIII Div 1 [1] industrial pressure vessels has typically been accomplished using rather simplified “equivalent static force” procedures. As detailed by Bardia et al [2], the equivalent static force from an earthquake event is developed from tabular data in building codes. In general, these procedures have proven to be safe and effective. However, this method assumes that deformation may occur but containment will be maintained. A similar assumption of deformation is contained in the modification factor used in building codes. If the vessel is expected to function after a specific earthquake event, such methods are not adequate for design. This paper addresses a more detailed procedure of seismic analysis that involves a finite element analysis of the vessel incorporating the interaction of the piping and the vessel. This methodology provides a better understanding of the localized stresses, such those as at vessel nozzles with pipe attached. This methodology may be used to analyze a vessel for a design that can be subjected to a specific earthquake response spectrum with minimal deformation and probable return to operation status.

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