Approx 20 Ton Fes Chiller Top Section: Res Standardrefrigeration, National Board #309952, Model #fev24113940-tmawp,Refrigeration, National Board #309952, 300 Psi @ 150 Deg F, Mawt -20 Deg F @ 300 Psi, Year 1992.150 Deg F, Mawt -20 Deg F @ 300 Psi, Lower Section: Res Standard Refrigeration, National Board #309953, Model #fev24113940-r. Ndard Refrigeration, National Board #309953, Tube Side: Mawp 150 Psi @ 150 Deg F, Mawt-20 Deg F @ 150 Psi. Shell Side: Mawp 300 Psi @ 150 Deg F, Mawt-20 Deg F @ 300 Psi, Year 1992. Tank: Fes Inc Carbon Steel,11in. Diameter X 30in. Straight Side, National Board #6197, Mawp 300psi @ 200 Deg F, Mawt -50 Deg F @ 120 Psi, Serial #930012, Year 1992.