Used 4000 Gallon Horizontal 304L-SS Jacketed Presuure tank. 6' dia x 18' Straight side (21'OAL) Dished heads. Internal rated 35 PSI @ 280 deg F. 304-L-SS Dimple jacket on bottom and side of tank rated 50PSI/FV @ 320 Deg F. Built 1976 by Industrial Alloy, S/N: 28356-2, NB #167.