A manometer is used to measure the gas pressure in the vessel shown in the figur

Question

A manometer is used to measure the gas pressure in the vessel shown in the figure. The manometer contains two immiscible fluids, one with a density of 40 lbm/ft3 and a second one with a density of 50 lbm/ft3. Determine the gauge and absolute pressure of the gas for conditions in the figure.

A manometer is used to measure the gas pressure in the vessel shown in the figure. The manometer contains two immiscible fluids, one with a density of 40 lbm/ft3 and a second one with a density of 50 lbm/ft3. Determine the gauge and absolute pressure of the gas for conditions in the figure.

Explanation / Answer

Gauge pressure is equal to 10 in of fluid 1 and 20 in of fluid 2 hence

Pg = 1 h1 + 2 h2 = 50/(12)3 (10) + 40/(12)3 (20) = 0.75 lbf/in2

Pa = Patm + Pg = 0.75 + 14.7 = 15.45 lbf/in2

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