Shell and Tube Heat Exchanger is the most universal type of heat exchanger in oil refineries and other large compound processes, and are suited for higher-pressure applications. Shell Tubes Heat Exchanger is classified into fixed and floating type Heat Exchangers. Fixed type Heat Exchangers are used where there are completely no chances for inter mixing of two fluids. Shell and tube heat exchangers consist of a series of tubes. One set of these tubes contains the fluid that must be either heated or cooled. The second fluid runs over the tubes that are being heated or cooled so that it can either provide the heat or absorb the heat required.
In this type, the tube sheets are completely welded to the shell and acted as shell flanges. The Floating type Heat Exchangers has the advantages of removability of tube bundle and access for cleaning both inner and outer side of tubes and shell.