1-2 These other types will be discussed briefly,but most of the space following will be devoted to the shell-and-tube types, primarily because of their importance,but also because the are most completely documented in the literature.Thus the can be designed with a degree of confidence to fit into a process.The other types are proprietary and for the most pa must be process designed by their manufacturers. 44 1-2 These other types will be discussed briefly, but most of the space following will be devoted to the shell-and-tube types, primarily because of their importance, but also because they are most completely documented in the literature. Thus they can be designed with a degree of confidence to fit into a process. The other types are proprietary and for the most part must be process designed by their manufacturers