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Use Illustration: |
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Design a Pipe suitable to flow 10m3/h of water (density 1000 kg/m3, viscosity 1 cp) over 10 m length with 3 m |
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elevation rise and having 1 90 degree elbow, 2 globe valves. |
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Solution: |
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1. Start by plotting a pressure profile of the system. (i.e. identify the inlet pressures and end pressures required in |
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each section of the pipe) Based on the pressure profile, identify the pressure drop allowable in the pipe section in |
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question. For our case say 40 kPa is allowable . (For more info on pressure profile write in.) |
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2. Select the pipe mettalurgy from drop down list. |
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3. Enter pipe length. |
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4. Click on input piping items and enter 1 90 degree elbow, 2 globe valves, click on calculate total k and click on |
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done. (This is used to calcualate equivalent lengths.) |
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5. Enter a guesses pipe internal diameter . 50 mm in this case. |
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6. Enter flowarte, density, viscosity and elevation difference. |
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7. Click on calculate to analyze the results. |
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In this case the pressure drop is 34 kPa that is within the allowable pressure drop limits and thus this pipe |
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diameter is fine. In case it is not change the pipe diameter to achieve the allowable pressure drop limit. |
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8. Based on the pressure profile and design pressure select the pipe thickness i.e. schedule. |
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This is the final design, the diameter and schedule of pipe has been defined. |
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Some select the pipe diameter based on velocity as well. |
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Note: Calculations are valid only for incompressible fluids. |