# 140211 Hydraulics Option 15

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# Description

To crimp the water underground pipeline (leak testing) is used manual piston pump. Determine the volume of water (modulus K = 2,000 MPa) to be pumped into the pipeline to increase the overpressure therein from 0 to 1.0 MPa. Read the pipeline absolutely rigid. Pipe dimensions: length L = 500 mm, diameter d = 100 mm. What is the force on the handle of the pump at the last moment of pressing, if the diameter of the pump piston DH = 40 mm, and the ratio of linkage arms a / b = 5.
Determine resistance coefficients dimensional nozzle diameter d, mounted in a pipe of diameter D, and the venturi comprised of the same nozzle diameter d and diffuser. The coefficients of resistance defined as the ratio of the total pressure loss in the velocity head in the pipeline. Given the diameter ratio D / d = 2. Take the drag coefficient: Nozzle ξs = 0.05; diffuser ξdif = 0.15 (both factors include the velocity in the narrow cross-section) at the same flow rate in the tube V = 3 m / s. When deciding to take into account the loss of pressure in the sudden expansion at the nozzle exit.