Fluid Mechanics: Head Pressure Calculation

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Questions and Answers

What is the pressure reading from a gauge located 3 ft from the bottom of an open tank with a liquid level of 9 ft and a specific gravity of 1.0?

3.12 psi

1.76 psi

2.26 psi (correct)

4.00 psi

If a gauge is located 5 ft from the bottom of an open tank containing 15 ft of liquid with a specific gravity of 1.1, what does it read?

1.83 psi

2.25 psi

4.72 psi (correct)

3.45 psi

What does a pressure gauge read when it is located 2 ft from the bottom of an open tank containing 8 ft of liquid with a specific gravity of 1.3?

1.08 psi

0.78 psi (correct)

3.46 psi

2.71 psi

Determine the gauge pressure if the gauge is 6 ft from the bottom of an open tank with 20 ft of liquid and a specific gravity of 0.9.

3.33 psi Signup and view all the answers

What is the gauge reading for a gauge located 4 ft from the bottom of an open tank with 16 ft of liquid and a specific gravity of 1.2?

2.25 psi Signup and view all the answers

What is the total pressure from a gauge in a closed vessel where the head pressure is 6.19 psi and atmospheric pressure is 4 psi?

9.19 psi Signup and view all the answers

In calculating the gauge pressure of a gauge located in a tank with a liquid having a specific gravity of 1.0 and a 72 in w.c. height, what is the gauge pressure?

2.59 psi Signup and view all the answers

What would be the head pressure in an open tank with a height of 120 in and specific gravity of 1.3?

62.76 in w.c. Signup and view all the answers

For a closed vessel with 180 in w.c. liquid height and a specific gravity of 0.95, what is the total pressure read?

16.19 psi Signup and view all the answers

Calculating the pressure for a tank with a liquid height of 144 inches and specific gravity of 1.2 gives what head pressure?

62.352 in w.c. Signup and view all the answers

What is the head pressure exerted by 10 ft of liquid with a specific gravity of 1.3 in an open tank, in inches of water column?

35.38 in w.c. Signup and view all the answers

How much head pressure is exerted by 15 ft of liquid with a specific gravity of 0.9 in psi?

0.54 psi Signup and view all the answers

Calculate the head pressure in psi exerted by 7 ft of liquid with a specific gravity of 1.5 in a closed vessel.

1.52 psi Signup and view all the answers

What is the total pressure in psi exerted by 12 ft of liquid with a specific gravity of 0.9 and 7 psi of nitrogen pressure in a closed vessel?

8.50 psi Signup and view all the answers

How much head pressure is exerted by 20 ft of liquid with a specific gravity of 0.7 in psi?

0.64 psi Signup and view all the answers

What is the pressure exerted by 8 ft of liquid with a specific gravity of 1.2 and 6 psi of nitrogen pressure in a closed vessel?

8.40 psi Signup and view all the answers

If the head pressure exerted by 4 ft of liquid with a specific gravity of 1.4 is converted to psi, what is the result?

0.56 psi Signup and view all the answers

What is the head pressure in inches of water column for 10 ft of liquid with a specific gravity of 0.85?

25.60 in w.c. Signup and view all the answers

How much head pressure is exerted by 12 ft of liquid with a specific gravity of 1.2 in psi?

1.68 psi Signup and view all the answers

Calculate the pressure in psi resulting from a 6 ft height of liquid with a specific gravity of 1.1 in a closed vessel.

0.64 psi Signup and view all the answers

Study Notes

Head Pressure

Head pressure is the pressure exerted by a column of liquid due to its weight
It is measured in inches of water column (in w.c.)
Head pressure can be calculated using the formula: Head Pressure = 0.433 x Specific Gravity x Height

Converting Head Pressure to PSI

1 psi = 27.7 in w.c.
To convert head pressure from inches of water column to PSI, divide the head pressure by 27.7

Head Pressure in Open Tank

The head pressure in an open tank depends on the height of the liquid and its specific gravity
Example: A 10 ft column of liquid with a specific gravity of 1.3 exerts a head pressure of 62.76 in w.c.

Head Pressure in Closed Vessel

The total pressure in a closed vessel is the sum of the head pressure and the pressure from any gas, such as nitrogen, that is present.
Example: A 12 ft column of liquid with a specific gravity of 0.9 in a closed vessel with 7 psi of nitrogen pressure exerts a total pressure of 11.68 psi (4.68 psi head pressure + 7 psi nitrogen pressure).

Pressure Gauge in Open Tank

A pressure gauge measures the pressure exerted by the liquid at its location.
The pressure gauge reading depends on the height of the liquid above the gauge and the liquid’s specific gravity.
Example: A pressure gauge located 3 ft from the bottom of an open tank with a liquid level of 9 ft and a specific gravity of 1.0 will read 2.59 psi.

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Description

This quiz explores the concepts of head pressure in fluid mechanics, including how to calculate head pressure using specific gravity and height. You'll also learn how to convert head pressure into PSI and understand its application in open tanks and closed vessels.