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If the highest pipe in a hot water hydronic heating system is 12 feet above the inlet of the expansion tank, what is the desired pressure in the expansion tank?

A. 10.2 psig
B. 15.4 psig
C. 20.6 psig
D. 5.2 psig

Answer :

Final answer:

The desired pressure in the expansion tank is 5.2 psig.


Explanation:

The pressure in the expansion tank is determined by the height of the highest pipe above the inlet of the tank. In this case, the highest pipe is 12 feet above the tank inlet. The pressure in the tank can be calculated using the formula P = ρgh, where P is the pressure, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the height. Assuming water as the fluid and using a density of 1000 kg/m³ and a gravitational acceleration of 9.8 m/s², the pressure in the tank can be calculated as follows:

P = (1000 kg/m³) * (9.8 m/s²) * (12 ft * 0.3048 m/ft)

P ≈ 362.016 Pa ≈ 0.0523 psi ≈ 5.2 psig

Therefore, the desired pressure in the expansion tank is 5.2 psig.


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