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Seismic loads on ASME VIII pressure vessels

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Aside from the issues discussed on this subject yesterday, there is the consideration of angle of the resultant load from gravity and seismic forces on the support saddle in regions of very high seismic demand.  Where the saddle support is less than 180 degrees of the vessel circumference, this can create a problem with shell stresses at the horn of the saddle.  This could be a problem in near fault locations where the resultant force can be over 20 degrees off the vertical.  None of the design tables that I have seen account for it.
Richard Hess
Hess Engineering Inc.
Los Alamitos, CA
(562) 799-9787
RLHess(--nospam--at)HessEng.com