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4. Determine the pressure drop in a vertical pipe with an internal diameter of 10 mm and a length of 2 m, where the flow is from the bottom to the top. The flow is adiabatic, the total mass flow rate is 0.02 kg/s and the steam quality is 0.05. The fluid is R-123 at a saturation temperature of 3 DC and a saturation pressure noonhuical proporties are liquid density - 1518 kg/m3. vapor CO weight of 17 kN/m. Assuming that construction traffic will impose a surcharge of 10 kPa outside the excavation, determine the maximum depth of excavation that can be achieved, with side support, if a factor of safety of 1.5 against base heave is required. (4)