Used 367 sq ft Pfaudler shell and tube heat exchanger. Hastelloy C276 tubes. Tube sheets and bonnets with (208) .75" diameter x 9' long tubes. Rated 150 psi@350F. Carbon steel jacket rated 150 psi@350F. 12" and 8" tubes inlet/outlet. 3" shell inlet/outlet. Serial #E379-1344. National Board #38900. Built 1979.