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R for building/non building/ sub system

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Title: R for building/non building/ sub system

Please refer to the " seismic guidelines for design of petrochemical faclities".  section for non building
structure & section 4.2.4 for subsystem. 

1.  The question is when do we consider a steel structure supporting a small vessel & exchanger in a two or three storied structure

(30 to 40' height) as a BUILDING STRUCTURE, so that we use R from table 16-N? 

If the equipment wt. is less than 0.25(wt. of the structure),  do we need to always consider lower R of equipment vs. the structure?

(appendix A, case 3 & 4) irrespective of the height or area (or 'building structure')

3.  It looks like most of the structures supporting a vessel/exchanger fall in 'subsystems'.    What should be the R for this?

I appreciate your time on this.

Ravi Vasu, P.E.,

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