question archive Consider a pumping scenario wherein 900 gpm of water at 80°F is transported
Consider a pumping scenario wherein 900 gpm of water at 80°F is transported
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Consider a pumping scenario wherein 900 gpm of water at 80°F is transported. The inlet reservoir and outlet reservoir are open to atmosphere. The water level in the inlet reservoir is 3.4 ft above the pump centreline; the inlet has 6 ft of 4.9 in. nominal diameter of straight cast iron pipe (absolute roughness of 0.00080 ft), a standard elbow and a fully open gate valve. The NPSH required for this pump is 25 ft. As a design engineer, you have been asked to check if the pumping system will cavitate or not. Please provide an explanation.
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Reynolds number = (density * velocity * diameter)/viscosity
Density 1000 kg/m3 at 80°F
Velocity = Q/A
Diameter = 0.1244 m
Viscosity = 1*10^(-5) at 80°F
So Re = 5.7* 10^ 7 turbulent
And e/D = 0.02 and from this two f = 0.05
Please see the attached file for the complete solution
