One used 166 sq. ft. Perry Products shell and tube heat exchanger, hastelloy C276 tubes, tube sheets and bonnets with (212) .75" diameter x 48" long tubes rated 75 PSI and full vacuum @ 320 F, carbon steel shell rated 100 PSI and full vacuum @ 320 F tubes, 8", (2)2" tubes inlet/outlet, (2)3" shell inlet/outlet, 16" diameter x 48" long tube bundle, serial# B-4289, national board# 3788, new 1988.