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Bernoulli's Equation Question

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A venturi has a large section diameter of 4', where the velocity V1=20ft/sec. The pressure difference between this section and throat, (P1-P2) = 25 psi. If the fluid is sea water (Sg=1.03) what is the diameter of the throat? Use figure #3 attached.

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Pressure difference,
P1 - P2 = 25 psi = 25*32*144 lb.(ft/s^2)/ft^2 = 25*32*144 lb/ft.s^2

D1 = 4 in
D2 = ...

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