pressure, physic

Question

A tank has a diameter of 19.2ft and a liquid height of 12.4ft. The tank contains a fluid with a specific gravity of 1.4, a temperature of 85.4ºF, and a density of 87.36lb/ft3. What is the pressure at the bottom of the tank?pr

Answer 1

If you ignore atmospheric pressure, the pressure at the bottom will be just p = ρgh.  In these English units, 

 

ρg = 87.36 lbs/ft^3

 

p = (ρg)h = (87.36 lbs/ft^3)(12.4 ft) = 1083.26 lbs/ft^2

 

This is actually the gauge pressure at the bottom of the tank.  To find total pressure, add atmospheric pressure:

 

p_a = 2116.2 lbs/ft^2

 

p_total = p + p_a = (1083.26 +2116.2) lbs/ft^2 = 3199.46 lbs/ft^2