773 Square Feet Graphite Union Carbide Vertical Shell & Tube Heat Exchanger. Shell rated 75 psi at 338 F. Tubes rated 25 psi at 338 F. Tube diameter 7/8". Tube length 14'0". Tube holes 241. Tube wall 1.25". Shell diameter 2'4". MFG by Union Carbide in 1991. Revised by FAMCO in 1997.