Used 40 sq ft U-tube horizontal shell and tube heat exchanger. 10" diameter X 4' long. Carbon steel shell rated 150/FV @ -20 to 350 degrees F. Stainless steel tubes rated 150/FV @ -20 to 350 degrees F. (26) U-tubes @ 4' long. Tubes 3/4" X BWG-16. 1 1/2" service inlets and 1 1/2" process inlets.