Used 31,000 (31,038) Gallon Vertical American Tank & Vessel API 620 304L Stainless Steel Storage Tank. 13'6" diameter x 30' height. Flat with sump bottom, coned top. 3/16" thick, Specific gravity - 1.08. 2.5 psi design pressure @ 210 C. Serial # 11326. Built 1996. Previous Use: ECYA Storage Tank. Empty weight - 15,624 #.