Unused 1527 sq. ft. CS heat exchanger. Mfg. by Fabsco Shell and Tube in 2023. 9.581 Design duty (MMBTU/Hr). Shell Design Rating: 305/FV psi @ 400 deg. F. Tube Design Rating: 232/FV psi@ 430 deg. F. Shell mawp 315/FV psi @ 400 deg. F. Tube mawp 315/FV psi @ 430 deg. F. 31" X 156". Serial # S21-13258 National Board #11438-13. Built 2023. Depropanizer Reboiler. Under Nitrogen Purge