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Comparisoas made with the t h o r e t i c a h e a t b e g t~t s .S~-U P . Sampling. and ShUt-dOWn p r o c e d~. Both units designed toA major question in fouling research is how to relate experimental data obtained in the laboratory using batch test equipment to "real" fouling in once-through processes in the field. Batch systems, which are common in laboratory experiments, provide useful data; however, it is difficult to develop a credible method for applying the data to once-through operations.Compositional changes due to the consumption and production of the key fouling species, as well as the bulk compositional changes due to maintaining the fluid at elevated temperatures, must be included in the model. Furthermore, due to the complex nature of petroleum fluids, it is difficult to develop a generic method. 'Researchers at Argonne National Laboratories( A m ) developed two field test units, as a first step towards (1) understanding the mechanisms of crude and product stream fouling on industrial heat exchangers, (2) evaluating fouling mitigation techniques, and (3) developing a scale-up methodology. The first unit was designed for installation at the Chevron El Segundo refinery in California. This unit was designed to obtain information on the mitigation of fouling in the twophase flow of hydrogen and product stream such as heavy gas oil and jet fuel.