A U-tube mercury manometer is attached between a water pipeline and an oil pipeline as shown in the figure (next page).

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A U-tube mercury manometer is attached between a water pipelineand an oil pipeline as shown in the figure (next page). Thespecific gravity of oil is 0.87 and the specific gravity of mercuryis 13.6. The column heights are (see fig.): h1 = 9.6 inches(water), h2 = 12.3 inches (Hg), and h3 = 8.4 inches (oil). Thelocal barometric pressure is 29 in Hg (29 inches of mercury).. Ifthe pressure inside the water pipeline is 40 psig (gage pressure),calculate the pressure inside the oil pipeline.