Task 68 Water is pumped into a closed water tank to a height of H = 5 m through two water pipes under normal conditions with diameters d1 = 50 mm, d2 = 100 mm and lengths L1 = 40 m, L2 = 25 m. Determine what should be the reading of the pressure gauge installed after the pump (Pman in at), if the reading of the manovacuumeter on the surface of the water in a closed tank corresponds to the vacuum pressure Rvak = 0.25 at with a throughput Q = 5 l / s. A Ludlo valve with a degree of closure a/d = 3/4 is installed on the first pipe. Take into account the loss of pressure during sudden expansion and at the outlet of water from the pipe into a large tank. Count the movement of water at constant pressure.

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