One of the most common heat exchangers in service within industrial process applications is the Shell & Tube Heat Exchanger. They are available in many shapes, sizes and have been used in industry for over 150 years. In this exchanger group are various sub design types: Fixed, U-tube and Floating tubesheet. Variations of all can be denoted as type E, F, G, H, J, K or X. The main applications are where high pressuretemperatures are key considerations.