prde piping design - process
TRANSCRIPT
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Pressure Drop in Pipelines
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Pressure drop equation(Sinnott R. K. , Coulson & Richardson’s Chemical Engineering, Vol 6)
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Pipe roughness(Sinnott R. K. , Coulson &
Richardson’s Chemical Engineering, Vol 6)
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Friction Factor(Sinnott R. K. , Coulson & Richardson’s Chemical Engineering, Vol 6)
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Pressure losses due to fittings/valves etc
• 1. Calculated as velocity heads• u2 / 2g
2. Calculated as equivalent pipe diameters
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Pressure loss in fittings and valves(Sinnott R. K. , Coulson & Richardson’s Chemical Engineering, Vol 6)
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Example(Sinnott R. K. , Coulson & Richardson’s Chemical Engineering, Vol 6)
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Power requirements for pumping(Sinnott R. K. , Coulson & Richardson’s Chemical Engineering, Vol 6)
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Energy for pumping(Sinnott R. K. , Coulson & Richardson’s Chemical Engineering, Vol 6)
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Example(Sinnott R. K. , Coulson & Richardson’s Chemical Engineering, Vol 6)
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Factors in pipe size selection
• Pressure – pipe thickness• Typical velocities and pressure
drops• Economic pipe diameter
• Capital costs• Operating costs
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Optimum pipe size - turbulent flow(Sinnott R. K. , Coulson & Richardson’s Chemical Engineering, Vol 6)
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Example 5.6(Sinnott R. K. , Coulson & Richardson’s Chemical Engineering, Vol 6)
• Estimate the optimun pipe diameter for a water flow rate of 10 kg/s at 20 C. Carbon Steel pipe will be used. Density of water is 1000 kg/m3.
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Example 5.7(Sinnott R. K. , Coulson & Richardson’s Chemical Engineering, Vol 6)
• Estimate the optimum pipe diameter for a flow of HCl of 7000 kg/h at 5 bar, 15 C, stainless steel pipe. The MW of HCl is 36.5 and the molar volume is 22.4 m3/kmol at 1 bar and 0 C.
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The end
Homework – Do example 5.8Next week: Separator Design