Heat exchanger TEMA types

Figure 8-2. Tubular Exchanger Manufacturers Association (TEMA) classification and terminology for heat exchangers. TEMA heat exchanger head types. 

TEMA Numbering and Type Designation Recommended practice for the designation of TEMA-style shell-and-tube heat exchangers by numbers and letters has been established by the Tubular Exchanger Manufacturers Association (TEMA). This information from the sixth edition of the TEMA Standards is reproduced in the following paragraphs. 

Figure 11-36 shows details of the construction of the TEMA types of shell-and-tube heat exchangers. These and other types are discussed in the following paragraphs. 

The Tubular Exchanger Manufacturers Assn, has established heat exchanger standards and nomenclature. Every shell-and-tube device has a three-letter designation the letters refer to the specific type of stationary head at the front end, the shell type, and the rear-end head type, respectively (a fully illustrated description can be found in the TEMA standards). Common TEMA designations are listed with specific configurations described below. 

The shell-and-tube exchanger is by far the most common type of heat exchanger used in production operations. It can be applied to liquid/liquid, liquid/vapor, or vapor/vapor heat transfer services. The TEMA standards dcTine the design requirements for virtually all ranges of temperature and pressure that would be encountered in an oil or gas production facility. 

Heat exchanger type and number of tubes Choose TEMA R because of large size. 

Typical values of the overall heat-transfer coefficient for various types of heat exchanger are given in Table 12.1. More extensive data can be found in the books by Perry et al. (1997), TEMA (1999), and Ludwig (2001). 

Figure 8.11. Tubular Exchanger Manufacturers Association classification and terminology for heat exchangers, (a) TEMA terminology for shells and heads of heat exchangers, (b) Terminology for parts of a TEMA type AES heat exchanger. The three letters A, E, and S come from part (a).

FIGURE 4 Standard notation system for major types of shell-and-tube heat exchangers. [From Tubular Exchanger Manufacturers Association Standards. (1988). 7th ed. TEMA, New York. 1985 by Tubular Exchange Manufacturers Association.]... 

Figure B.l Type of shell-and-tubes heat exchangers following TEMA standards [1].

Basis Tubing is 1 in. OD X 16 BWG, except as noted. Heat exchangers are TEMA-type BEM with in. OD x 16 BWG X 20 ft welded tubing and mild-carbon steel shells. 

The resultant calculations based on these models may therefore provide values of foulant thermal resistance that are just as much in error as the TEMA type recommendations. The principle advantage of the models however that must not be underrated, is they do show the interaction of the variables and by an iterative process the designer is led towards an improved heat exchanger design in respect of fouling. 

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