PITOT TUBE

1. Air at 200 F (93.3 C) is forced through a long, circular flue 36 in. (914 mm) in diameter. A pitot-tube

reading is taken at the center of the flue at a sufficient distance from flow disturbances to ensure normal

velocity distribution. The pitot reading is 0.54 in. (13.7 mm) H2O, and the static pressure at the point of

measurement is 15.25 in. (387 mm) H2O. The coefficient of the pitot tube is 0.98. Calculate the flow of

air, in cubic feet per minute, measured at 60 F (15.6 C) and a barometric pressure of 29.92 in. (760

mm) Hg.

VENTURI METER

2. A venture tube, fabricated with a machined entrance cone according to ASME specifications, is

inserted in a 4-in. ID pipe and has a throat diameter of 3 in. If the flowing fluid is 60F water, the

pressure-sensing lines are filled with water, and the pressure transducer reads 4 psi, what is the water

flow rate?

3. A horizontal venture meter constructed of welded sheet metal is to be installed into a 60-cm-ID

welded steel pipe. The flowing fluid is water at 40 C. The maximum flow rate is 0.563 m3/s and the

maximum allowable pressure drop is 20 kPa. Determine the throat area.

FLOW NOZZLE

4. A flow nozzle is to be inserted in a 2-in.-diameter pipe (ID = 2.067 in.) to measure an airflow of up to 2

lbm/sec. Upstream of the nozzle, the air pressure is 150 psia and the temperature is 300 F. for air is

1.4. Pipe wall taps are to be used and the maximum pressure drop across the nozzle is to be 5 psi.

Determine a suitable minimum area for the nozzle.

ORIFICE METER

5. A sharp-edge orifice with corner taps is to be used to measure water flow rate in a horizontal 2-in.

pipe (2.067 in ID). The maximum flow is expected to be about 7 cubic feet per minute. Determine the

diameter of the orifice if a maximum pressure difference of about 2 psi is acceptable.