USED DOYLE & ROTH HORIZONTAL 315 SQUARE FOOT HASTELLOY HEAT EXCHANGER. 18" DIAMETER X 6' LONG TUBE BUNDLE. 304 STAINLESS STEEL SHELL RATED 150 PSI @ 350 deg F. HASTELLOY C276 TUBES, TUBE SHEETS, AND BONNETS. (268) 3/4" DIAMETER X6' LONG TUBES RATED 150 PSI/FULL VACUUM @ 350 deg F. 6", (2) 2" TUBES INLET/OUTLET, AND (2) 3" SHELL INLET/OUTLET.