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Unformatted text preview: C. Compute the sublayer thickness in inches
and the pumping horsepower required at 75 percent efficiency if L 40 ft.
P6.52 The pipe flow in Fig. P6.52 is driven by pressurized air in
the tank. What gage pressure p1 is needed to provide a
20°C water flow rate Q 60 m3/h?
*P6.53 In Fig. P6.52 suppose P1 700 kPa and the fluid specific
gravity is 0.68. If the flow rate is 27 m3/h, estimate the
viscosity of the fluid. What fluid in Table A.5 is the likely
suspect? | e-Text Main Menu | P6.55
P6.56 Consider a horizontal 4-ft-diameter galvanized-iron pipe
simulating the Alaskan pipeline. The oil flow is 70 million
U.S. gallons per day, at a density of 910 kg/m3 and viscosity of 0.01 kg/(m s) (see Fig. A.1 for SAE 30 oil at
100°C). Each pump along the line raises the oil pressure
to 8 MPa, which then drops, due to head loss, to 400-kPa
at the entrance to the next pump. Estimate (a) the appropriate distance between pumping stations and (b) the power
required if the pumps are 88 percent efficient...
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- Spring '08