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Daryl, The confusion comes from the tank manufacture's use of the term nominal. According to the Merriam Webster online dictionary the term nominal means "existing as something in name only : not actual or real". If you scroll down the page on the Merriam Webster site for the full definition you will see 3b which says "of, being, or relating to a designated or theoretical size that may vary from the actual : approximate <the pipe's nominal size>". In your original question you had "Nominal diameter  15'6", nominal height  16ft, nominal capacity  500 barrels". If that is what is printed on the manufacturer data plate then there is nothing I can do yo help as you don't know any of the actual dimensions. Harley
 


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