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A steam pipe is to transport 200 lbm/s of steam at 200 psia. Calculate the minimum diameter this pipe can have so that the steam velocity does not exceed 59 ft/s.

a) 6 inches
b) 8 inches
c) 10 inches
d) 12 inches

Answer :

Final answer:

The minimum diameter of the steam pipe is approximately 24.8 inches.

Explanation:

To calculate the minimum diameter of the steam pipe, we can use the equation for the flow rate of a fluid through a pipe:

Flow rate = velocity x cross-sectional area

Given that the flow rate is 200 lbm/s and the velocity should not exceed 59 ft/s, we can rearrange the equation to solve for the cross-sectional area:

Cross-sectional area = flow rate / velocity

Converting the units to consistent ones, we have:

Cross-sectional area = (200 lbm/s) / (59 ft/s) = 3.39 ft²

Finally, we can calculate the diameter of the pipe:

Diameter = 2 x square root of (cross-sectional area / pi)

Plugging in the values, we get:

Diameter = 2 x square root of (3.39 ft² / 3.14) = 2.07 ft

Converting this value to inches, we have approximately 24.8 inches. Therefore, the minimum diameter the pipe can have is approximately 24.8 inches, which is not one of the given options.

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