Used approx 570 Sq Ft Carbon Steel Horizontal Shell and Tube Heat Exchanger. Mfg Manning and Lewis. Shell MAWP 100PSI@375F. Tubes MAWP 150PSI/FV@375F. Serial #17278. National Board #8812. Built 1998. Rerated Shell 100 PSIG 50/650F. Tubes 125PSIG 50/650F. 2001.