Gasoline flows at 300gpm through a 4-inch Schedule 40 pipe. Determine: a. The we
ID: 1848518 • Letter: G
Question
Gasoline flows at 300gpm through a 4-inch Schedule 40 pipe. Determine:a. The weight flow rate in lb/s [28.3lb/s]
b. The flow velocity [7.56 ft/s]
c. The velocity downstream from a reduction to 3-in Schedule 40 pipe. [13.02 ft/s]
Explanation / Answer
Q = 2.35x10-3 m3 M = ?Q --> mass flow rate= 0.90 *1000 *2.35 x10-3 =2.115 kg /s W = weight flow rate= M g = 0.90 *1000 *2.35 x10-3 *9.81 = 20.74815 N/s ======================== Density = S.G x 1000 kg /m^3 No, if the diameter of the pipe is .6 m then its radius is .6/2= .3 m. You should have 5/(pi* .3* .3)= 17.7 m/s. Velocity downstream increases when there are more streams feeding the main stream. If the total volume of those side streams is bigger than the volume of the main stream, it means that water is "crammed" into the smaller area and has to flow faster. The same thing happens in our cardiovascular system - blood in the cappilaries flows slower than in arteries, because the total volume of the cappilaries is bigger than the volume of the artery they flow into.
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