Manometer hints

An oil pipeline was constructed to transport an oil with SG = 0.8 a distance of 10 mi. The country was hilly, so that the line made many ups and downs. These may be considered equivalent to 10 rises of 200 ft, followed by descents of 200 ft. When the pipe was completed, it was tested by pumping water through it. The water flowed satisfactorily with a pressure at the inlet end of 150 psi. Then the oil was slowly fed into the pipe. As the oil flowed, the pressure at the inlet end began to rise, and the flow rate began to fall. Finally, the flow stopped altogether, while the pressure at the inlet side remained at 150 psi. Explain what caused this. (Hint This is a manometer problem.)... 

Hint From the gas density calculated by eq. (3.33) the sorptive gas pressure p = p (p, T) inside the adsorption vessel can be calculated via an accurate thermal equation of state. That is, the MSB also can be used as a (fairly sensitive) manometer, especially at very high and very low pressures [3.6, 3.26],... 

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