USED DOYLE & ROTH 495 SQUARE FOOT HASTELLOY HEAT EXCHANGER. 22" DIAMETER X 6' LONG TUBE BUNDLE. 304 STAINLESS STEEL SHELL RATED 150 PSI @ 350 Deg F. HASTELLOY C276 TUBES, TUBE SHEETS, AND BONNETS. (421) 3/4" DIAMETER X 6' LONG TUBES RATED 150 PSI/FULL VACUUM @ 350 deg F. 8", (2) 3" TUBES INLET/OUTLETS, AND (2) 6" SHELL INLET/OUTLETS.