1920,000 kg/h of kerosene (42 API) leaves the base of a kerosene side-stripping column at 200 C and is to be cooled to 90 C by exchange with 70,000 kg/h light crude oil (34 API) coming from storage at 40 C. The kerosene enters the exchanger at a pressure of 5 bar and the crude oil at 6.5 bar. A pressure drop of 0.8 bar is permissible on both streams. Allowance should be made for fouling by including a fouling factor of 0.0003 (W/m C) -- on the crude stream and 0.0002 (W/m C) on the kerosene stream. Calculate the number of tubes required and the shell diameter. Assume following conditions: Tube OD = 19.05 mm (3/4"), ID = 14.85 mm Tube length = 4.88 m (16") (as first trial) Triangular pitch = 23.81 mm (pitch/dia. = 1.25) Two tube passes (as first trial) Split-ring floating-head exchanger (rear end head type S) Segmental baffles with a 25% cut m Inlet Mean Outlet 90 200 145 C 2.72 2.47 2.26 Kerosene Temperature Specific heat Thermal conductivity Density Viscosity 0.130 0.132 730 kJ/kg C W/m C kg/m mN s/m2 0.135 770 0.80 690 0.22 0.43 Outlet Mean Inlet 40 Crude Oil Temperature Specific heat Thermal conductivity Density Viscosity 2.01 0.135 840 C kJ/kg C W/m C kg/m mN s/m2 4.3