An oil pipeline and a 1.3-m3 rigid air tank are connected to each other by a manometer, as shown in Fig. P3-146. If the tank contains 15 kg of air at 80
(a)
The absolute pressure in the pipeline.
Answer to Problem 146P
The absolute pressure in the pipeline is
Explanation of Solution
Given information:
Volume rigid air tank is
Write the expression for absolute pressure of air in the tank.
Here, the mass of air in the tank is
Write the expression for absolute pressure in the pipeline.
Here, specific gravity of oil is
Calculation:
Substitute
Substitute
Conclusion:
The absolute pressure in the pipeline is
(b)
The change in
Answer to Problem 146P
The change in
Explanation of Solution
Given information:
Temperature of air in the tank is
The figure below shows the new schematic diagram of manometer.
Figure-(2)
Write the expression for absolute pressure of air in the tank.
Here, the mass of air in the tank is
Write the expression for equation of balancing the volumes in both arms of the manometer.
Here, the diameter of limb is
Write the expression for vertical height corresponding to
Substitute
Write the expression for equation of pressure head balance in manometer.
Substitute
Calculation:
Substitute
Substitute
Conclusion:
The change in
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