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Seismic Design of Nitrogen Storage Tank

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I need to design a foundation for a nitrogen storage tank.  The tank is 8
ft diameter x 37 feet tall.  It is supported on 3 legs, about 2 feet off of
the base.  I wondering which guidelines are used for the seismic force
analysis.  FEMA 450 (2003) section 14.4.7.12 that refrigerated liquids are
beyond the scope of the standard and references commentary section
14.1.2.2.  In the commentary they list a bunch of standards but none seem
to apply to refrigerated pressure vessels.  Can someone point me in the
right direction of which standard to use to perform a seismic analysis for
this type of tank?

Thanks.

Rich



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