One (1) used 686 sq ft Atlas Industrial Shell And Tube Heat Exchanger, Tema type BEM 21-120. 316L stainless steel tubes, tube sheets and bonnets with (350) .75" diameter x 10' long tubes rated 100 psi and full vacuum at 450 f, Carbon steel shell rated 150 psi at 450 3'', 4'',8'' tubes inlet.outlets, 6'' shell inlet/outlets, 21" diameter x 10' long tube bundle, serial# 8584, national Board# 7239, new 1993.