CIV E 444 - APPLIED HYDRAULICS
SPRING 2016
LAB No. 12

  1. A 24-in diameter pipe converges into an 8-in pipe as shown in the figure. A gate slot is located in the smaller pipe. Use the free-vortex incipient cavitation index σi to estimate the flow rate that will cause incipient cavitation near at or near point A in the gate slot.

  2. An axial pump with characteristics shown in the figure below has a diameter of 40 cm and is operated at a speed of 1000 rpm. What is the discharge when the head is 3 m? What power in kilowatts is required for these conditions?

  3. A radial pump has the characteristics shown below. At what speed should the pump be operated at maximum efficiency under a head of 70 m? What would be the discharge for this head? What power would be required?

  4. The performance curve of a certain pump is given by:   H = 70 - 700 Q 2, with H in m and Q in m3/s. Given the system shown below, what is the discharge and corresponding head at the system operating point? Assume sharp entrance and exit losses.