Double Pipe Heat Exchanger is made of concentric inner and outer pipe. Cold and hot liquid respectively flows in the gap of inner pipe and outer pipe and exchanges heat at the same time. U bends are used for inter connecting Inner Pipe. Structure of double pipe heat exchanger is simple and heat transmission Is large. Generally used for high Flow rate, Temperatre & Pressure conditions, and heat transfer rate is high. Double pipe HE̢۪s are generally fabricated from exotic materials like LTCS, SS & Non Ferrous.