Crude oil at the rate of 150,000 kg/h is to be heated from 20 to 57°C by heat exchange with the bottom product from a distillation unit. The product at 129,000 kg/h is to be cooled from 146 to 107°C. There is available a tubular exchanger with steel tubes with an inside shell diameter of 23¹/₄ in., having one pass on the shell side and two passes on the tube side. It has 324 tubes. ³/₄-in. OD, BWG 14, 12 ft long arranged on a 1-in.-square pitch and supported by baffles with a 25 percent cut, spaced at 9-in. intervals. Would this exchanger be suitable; that is, what is the allowable fouling factor? The average properties are shown in Table 15.2.

Table 15.2

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TABLE 15.2 Data for Prob. 15.2 CJ/g. "C 14. CP p. kg/m³ k, W/m-°C Product, outside tubes 2.20 5.2 867 0.119 Crude, inside tubes 1.99 2.9 825 0.137