tower structure
tower structure
(OP)
One of the most typical shapes for a refinery tower has a larger lower section and a smaller upper section connected to each other through a cone. When it comes to erection of this vessel, the skirt can be easily attached to the lower section.
Can a tower have a smaller lower section as compared to the upper section? In that case, is the skirt attached to the lower section? I would imagine such a structure would be more unstable than the one with a bigger lower section. Please comment, and suggest related reading.
Can a tower have a smaller lower section as compared to the upper section? In that case, is the skirt attached to the lower section? I would imagine such a structure would be more unstable than the one with a bigger lower section. Please comment, and suggest related reading.





RE: tower structure
Suggested reading would start with any text which deals with the design of skirts and VIII.
Don't forget to check the top of the skirt (lower forces and moments) at the design temperature of the vessel and the bottom of the skirt (highest forces and moments) at (typically) ambient temperatures.
The same would apply to flared (conical) skirts. These are unusual, but the same concepts would apply.
jt
jt
RE: tower structure
If the tower is too tall/thin, you need to check p-delta deflection in it.
RE: tower structure
Yes, the POV is higher for the smaller diameter lower section design. However, if your anchor sizes are starting to exceed 2.5" diameter than you can always flare the skirt. Please read a standard vessel design book from such authoritative books by Bedner or Brownell & Young. They'll explain it all.