6.

7.

An orifice having a diameter of 1" is used to measure the flowrate of a fluid (S.G. =0.85, viscosity=20 cp) in a

horizontal, 2-in, sch 40 pipe at 70 F. The pressure drop is measured by a mercury monometer (SG=13.6),

which read 3.0 cm. Calculate the volumetric flowrate of the fluid.

An underground pressurized water tank is used to fill an elevated tank at 100 gpm of water. process. The

underground tank is 20 feet below the pump with is used to transfer the liquid to the elevated tank 50 feet

above the pump and open to the atmosphere. The pump is 10 hP, n=0.9, with a NPSHR of 30 feet. The

suction side piping is 35 feet, 3" Schedule-40 carbon steel, the discharge piping is 65 feet, 2" schedule-40

carbon steel. Friction loss through fitting and valves may be disregarded.

What is the minimum pressure in Tank 1 that will allow the pump to work without cavitation?

20

2

50 ft