A closed end manometer (as shown in the figure below) is used to measure the pre

Question

A closed end manometer (as shown in the figure below) is used to measure the pressure in a water pipe. The main operating fluid in the manometer is mercury capped with carbon tetrachloride. Unfortunately, however, mixing in the manometer occurred due to a loss of pressurization in the water main, resulting in water in the closed arm and making the existing calibration inaccurate. A schematic of the resulting manometer is shown below. Determine the current operating pressure in the water pipe. Report your answer in both psia and psig.

Explanation / Answer

Let the pressure in the water pipe be P

Since pressure in both end of U tube sgould be equal

Pcarbon tetrachloride + Pwater + P =Pmercury + Pwater

Hence P=Pmercury + Pwater -(Pcarbon tetrachloride + Pwater )

P=13.69*g*130+1*g*12- 1.59*g*10- 1*g*146

P= 1629.8g=1598287.8 barye= 23.1812psi=8.485256psig

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