2000 Twin Heat Exchanger System. Natl board 3327 and 3326, S/N 3129 and 3128, Year 2000, Meters/Controls: (4) Worcester Actuators Series 39 (6) Fischer Model 1-1/4 in. (2) El-O-Matic Actuators Type ESA-65-4/A. (32) Tubes. Tube diameter: ½ in. Shell and tube side MAWP @ 375 °F: 150 psi. Shell and tube side MDMT @ 150 psi: -20 °F. Tube length: 31 in. Shell dia: 6-1/2 in. Material of construction (tubes): 304 stainless steel. Material of construction (shell): cast nickel. 1st Heat Exchanger Inlet Gauge 100 psi max Outlet Gauge 200 psi max, 2nd Heat Exchanger inlet gauge 100 psi max outlet gauge 160 psi max, (2) Bell and Gosset Pumps S/N22952 and 2296249, Model 1 1/4 AC 5hp 208-230/460 V, 3,465 rpm Capacity 60 gpm 138 ft, 77 in. L x 39 in. W x 80 in. H.