Calculate the pressure on an Onion Tank

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The discussion focuses on calculating the total pressure in a 22-ft onion tank filled with a hydrocarbon fluid, incorporating the vapor pressure of 430 psi and an additional 55 psi from nitrogen. The formula used for pressure calculation is height multiplied by 0.433 and the specific gravity of the fluid. The calculated pressure results in approximately 491.86 psi when all components are added together. There is a concern regarding whether to include the vapor pressure in the final calculation. The importance of checking units is also emphasized to ensure accuracy.
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I am concerned about adding the Vapor pressure of 430 psi to the equation. Should it be done??

1. Homework Statement

Calculate the pressure produced by a 22-ft onion tank filled with a hydrocarbon fluid (0.72 sg). Vapor pressure is 430. Add 55 psi N2 to the total. What is the final pressure?

2. Homework Equations

Height x 0.433 x specific gravity (according to the textbook) = pressure.

The Attempt at a Solution



22 ft. x 0.433 x 0.72 = 6.85872 psi + 430 psi + 55 psi = 491.85872 psi
 
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Vapor pressure is 430

Check the units?
 

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