Used 100 square foot vertical shell & tube heat exchanger. Hastelloy B tubes (121) 3/4" OD X 16 BWG X 4' 3" long. Carbon Steel Shell 12 3/4" Diameter. Hastelloy B Heads. Tube side rated 125/FV @ 350 degrees F. Shell side rated 125 psi @ 350 degrees F. Coolant in/out 3". Vapor In 6". Vent out 3". Conden. Out 1 1/2". Built by Cousins. 1987. SN 1286-9. NB 5827.