The main function of Shell & Tube Type Evaporator is to act as a heat exchanger in a vessel form. This is mainly done to cool closed circuit for re-circulating fluid flow. This can be done with the help of refrigerants as a cooling medium. They are efficient in working and having compact design. The concept of the equipment is based on large number of tubes that can be formed into bundles. The refrigerants passed through the expansion device that passed into tubes and evaporates to produce a cooling effect.