An engineer is installing an open-end mercury manometer attached to a pipe that

Question

An engineer is installing an open-end mercury manometer attached to a pipe that will eventually carry pressurized gas. While the pipe is open to the atmosphere, she adds enough mercury into the manometer that the mercury level in both arms of the manometer is 770.0 mm above the bottom of the manometer. (See Fig. 1) If the end of the open arm of the manometer is 1020.0 mm above the bottom of the manometer, what is the maximum pressure (gauge) of the pressurized gas that the pipe can carry before the mercury spills out the open end the manometer? (See Fig. 2) 14.696 psi/760 mmHg

Explanation / Answer

pressure of gas = height difference = 1020.0 - 770.0 = 250 mmHg

250 mmHg = 250 mmHg x 14.696 psi / 760 mmHg

= 4.834 pis

so answer : 4.834 psi

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