The tubes in a shell and tube heat exchanger carry the fluid that needs to be either heated or cooled. A set of tubes is called a tube bundle; these bundles can be made up of several types of tubes: plain, longitudinally finned, and so on.

With capacities ranging from 6" to 60" diameters and pressures from full-vacuum to 20000psi, AFGO tube bundles are made from a wide range of materials, from carbon steel and stainless steel to hallestoy.