TEMA is the acronym of the Tubular Exchanger Manufacturers' Association, and the adjoining thumbnail views illustrate their standard designations for different varieties of Shell-and-Tube construction.

These range from the popular and cost-efficient BEU to more involved constructions that facilitate cleaning and repair, or can cope with severe operating conditions.

TEMA broadly classifies shell-and- tube units in three generic groups; Class-R is used for especially severe conditions, e.g. in Petroleum Processing, and Class-C for more moderate conditions. Class-B finds wide use in chemical processing service.

Among other types, Bowen is currently involved in the examination of the Kettle Type Reboiler, a less usual construction, for an energy recovery project. "Therminol" heat transfer media would be piped from a waste gas heat recovery unit, and used in the reboiler to generate process steam, or possibly to operate a low-pressure steam turbine for electric power generation.

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