Get current pricing for National Tank, 45,000 Gal Carbon St 45,000 Gallon Horizontal Cs Pressure Tank Rated 50 Psi @ 650 Deg F. 2:1 Elliptical Heads. 12', Dia X 50', 6 Straight Side (56', 3 Oa . Product Category: Process Equipment, Sub Category: Pressure Vessels: