TEMA R also requires a greater minimum thickness for some components. Spiral wound gaskets with a ring construction also meets this TEMA R requirement. TEMA R includes the requirement for confined gasket joints where recesses must be machined in the flanges and tubesheets. TEMA B and TEMA R are very similar in scope. ![]() The general description of the three major TEMA classes are: Tema C - General Service TEMA B - Chemical Service TEMA R - Refinery Service Tema R is the most restrictive and TEMA C is the least stringent. Vendors who build to TEMA standards can be competitively compared because tolerances and construction methods should be very similar for a given design. An advantage of TEMA standards is that end customers recognize that the specifications set forth comprise industry standards that directly relate to recognized quality practices for manufacturing. TEMA stands for Tubular Exchanger Manufactures Association. 2 TEMA is a set of standards developed by leading heat exchanger manufacturers that defines the heat exchanger style and the machining and assembly tolerances to be employed in the manufacture of a given exchanger.
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