Gage pressure is measured relative to atmospheric pressure. The pressure in cert

Question

Gage pressure is measured relative to atmospheric pressure. The pressure in certain tank could be -55 Pa(abs) The pressure at the bottom of a tank depends only on the fluid regardless of the fluid type. The magnitude of an upward buoyancy force on fully immersed object depends on its shape as well not only its volume. Complete table below. For the tank shown in the figure , determine the reading of the bottom pressure gage in psig if the top of the tank is vented to the atmosphere and the depth of the oil h= 28 ft. If the top of the tank is sealed and the top gage reads 45.0 psig, determine the reading of the bottom gage in Psig. (Assume unit weight of water=62 lb/ft^2)

Explanation / Answer

1. a) T

b) F

c) F

d) F

e) Pressure=83.2 psi

gauge pressure = 31.5 kpa

2. a)

Hydrostatic pressure in a liquid can determined using the following equation:

p = h ? g = h ?   

where

p = pressure (psf)

h = height of fluid column, or depth in the fluid at which the pressure is measured ( in) = 28 ft = 8.5344 m

? = density of liquid (slugs/ft2)

g = the gravitational constant ( 32.17405 ft/s2)

     ? = specific weight of oil = 0.85*32.17405 = 27.348 kN/m3

hence, pressure = 8.5344 x 27.348 = 233.4 kN/ m2 = 33.852 psig...... (Ans of 2.a)

b) Reading on bottom gauge = 45 + 33.852 = 78.852 psig ........ (Ans.2b)

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