steel tank and structure design

[tominino]

i am designing a 7000 gallon steel tank on a 12meters stanchions with 6 legs,i need the table value for a 7000 gallon in other to get the horizontal beam and the stachions

 

[JStephen]

I don't really understand the question.

 

[JAE]

There probably isn't a table where you go look up beam sizes (my guess). This sounds like it requires structural analysis and design - if you don't have the qualifications to design these properly, you should hire a structural engineer to help you.