Used 4522 sq ft Atlas shell and tube heat exchanger. 304L stainless steel tubes. Tube sheets and shell with (1152) .75 " dia x 20' long tubes rated 150 psi@300F. Shell rated 150 psi@300F. Carbon steel bonnets, multi pass design. 10" tubes inlet/outlet. 10" shell inlet/outlet. 36" diameter x 20' long tube bundle. Serial#6901. National Board #5670. Built 1988.