Approx. 6,000 gallon NSM Industries Inc. carbon steel horizontal high pressure storage tank. Ammonia Storage tank #M-21026-7, rated 300 psi @ 650 F, Min Design Temp -30 F @ 300 psi. 36" Top Manway, Length 18 1/2 Feet, 81" Dia. Serial #19434, Built 1989, national board stamped. Previous Use: Ammonia Storage