Solution

10ft carbon tetrachloride (specific gravity = 1.4)

10ft gauge pressure reading water carbon tetrachloride (specific gravity = 1.4)

gauge pressure reading

CLM.5 STORAGE TANK CALCULATION

Since the density of air is effectively zero, the contribution of the air to the 3-ft manometer reading can be neglected. The contribution to the pressure due to the carbon tetrachloride in the manometer is found by using the hydrostatic equation.

Since the right leg of the manometer is open to the atmosphere, the pressure at that point is atmospheric:

Note that this should be carried as a positive term.

The contribution to the pressure due to the height of water above the pressure gauge is similarly calculated using the hydrostatic equation.

The pressure at the gauge is obtained by summing the results of the steps above, but exercising care with respect to the sign(s):

P= 14.7- 1.82+ 1.3 = 14.18 psia = 14.18 - 14.7 = -0.52 psig

The pressure may now be converted to psfa and psfg:

P = (14.18) (144) = 2042 psfa = (-0.52) (144) = -75 psfg

Care should be exercised when providing pressure values in gauge and absolute pressure. The key equation is gauge) = /'(absolute) — /'(ambient) (consistent units)

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