Methane was boiling in a vacuum distillation plant with a boil-up rate of 0.33 kg/s. The pipe length is 7 m, e/d = 0.001 and viscosity is 0.02 mN s/m2. The operating pressure is 10 kN/m2 and isothermal at 333 K. The molecular weight of methane is 16 kg/kmol. Calculate the pressure drop along a 100 mm bore vapour pipe used to connect the column to the condenser.
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