Consider a constricting portion of a pipeline carrying water vertically downward as pictured. At the top (1), the diameter is 7 inches, the velocity is 10 feet per second, and the pressure is 46 psi. 40 feet below the diameter is only 3 inches. What is the pressure in psi at the point (2)?

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Pressurized pipe flow

A 15-kilometer-long pipe with a pipe diameter of one meter transports water at a speed of one meter per second. The pipe has a friction coefficient of 0.005. Calculate the frictional head loss?