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23 Pressure drop
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Worked example
Pipeline (d=15 cm) 200 m long connects water tower to a
user (Q=10 liters/s). Pipes are new and made of steel. Whatis
the pressure drop in the system?
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Worked example
Some questions:
1. Short or long pipeline?
2. How many components?
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Step by step
1. Calculate velocity of flow2. Calculate Reynolds number3.
Determine relative roughness
4. Find friction factor5. Apply Darcy formula
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1. Calculation of velocity of flow
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2. Calculation of Reynolds number
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3. Find relative roughness
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Absolute roughness of pipe
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Absolute roughness of pipe
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3. Find relative roughness
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4. Find friction factor
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12/23Moody diagram
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13/23Moody diagram
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5. Apply Darcy formula
- lambda - friction factor
l - length of pipe (m)d - diameter of pipe (m)
u - velocity of flow (m/s)
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5. Apply Darcy formula
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Pressure drop - useful links
http://www.pressure-drop.com/Online-Calculator/
http://www.sizepipe.com
http://www.sizepipe.com/http://www.pressure-drop.com/Online-Calculator/
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Online calculation
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Online calculation
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Convertion to meters:
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According togeneral hydrostatic equation
