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Heber RodrÃguez on Maximum or Minimum height / Diameter ratio in AST API tanksBy: Heber RodrÃguez 
Date: Wednesday, February 16, 2011
Time: 10:36:34 AM
Hello dear experts.
I would like if there is some rule or statement in API 650 or 620 or empiric rule that mention the maximun or minimun H / D ratio for AST tanks, regard less the acorage requirement or minimum shell thikness, the main worry is how slender could be a tank regarding the sismic issues.
I am designing a tank with the following dimensions:
diameter: 3.7 m
Height: 9.8 m
I read API 650 app. A table A-1a typical sizes for small tanks, and I found the folowing:
for a 3 m diameter tanks there is an avaible height of 10.8 m.
That means my tank is within the size average, but I woul be more clear about this relation H/D, I wold like read more about this.
Like always it would be hightly apreciate your help, ThANKS in advance.