Shell and Tube Heat Exchangers Shell and Tube Heat Exchangers are used mostly in the chemical processing industry for heating, cooling, condensing, and evaporating highly corrosive liquids and gases. Shell and tube heat exchangers are one of the most popular heat exchanger types of heat exchanger because of their flexibility to accommodate a wide range of temperatures and pressures. Unlike conventional shell and tube heat exchangers , Niche products avoid scaling and fouling by using tubing made from essentially chemically inert fluoropolymers. Niche is the original fluoropolymer heat exchangers manufacturer and still the only company that makes FEP and PFA tubing for