1,400 Square Feet (0.77 MM BTU/HR) Richard M. Armstrong Company Scraped Surface Heat Exchanger. Shell (Material SA-516-70) rated 260 psi @ 24°F/39°F (In/Out). Unit consists of (10) double pipes shell consisting of (2) rows side by side x (5) rows high, 1'2" ID x 42' long, supported on common framework, inner connected with nozzles. Tubes (Material SA-106 Gr. B) rated 400 psi @ 170°F/65°F (In/Out). Overall dimensions 6'W x 46'7" x 13'6"H, Approximate weight 65,000 #. Serial # A-8733149A, National Board # 8902, Built 1988 (Qty. 18 similar units).