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Diameter Calculations
Optimum Economic Diameter (considering piping, pumping and maintenance costs)
For Turbulent Flow and Di ≥ 0.0254 m,
Diameter Calculations
Optimum Economic Diameter (considering piping, pumping and maintenance costs)
For Turbulent Flow and Di < 0.0254 m,
Diameter Calculations
Optimum Economic Diameter (considering piping, pumping and maintenance costs)
For Viscous Flow and Di ≥ 0.0254 m,
Diameter Calculations
Optimum Economic Diameter (considering piping, pumping and maintenance costs)
For Viscous Flow and Di < 0.0254 m,
Diameter Calculations
Optimum Economic Diameter (Peters and Timmerhaus, 2004)
For Turbulent Flow and Di ≥ 0.0254 m,
025.013.045.0
32.0
025.045.0
, 363.0363.0
fcv
opti qm
D
D = opt pipe diameter (m), qf = vol. flowrate (m3/s), ρ = density (kg/m3), μ = viscsity (Pa-s)
Diameter Calculations
Optimum Economic Diameter (Peters and Timmerhaus, 2004)
For Turbulent Flow and Di < 0.0254 m,
027.014.049.0, 49.0 fopti qD
D = opt pipe diameter (m), qf = vol. flowrate (m3/s), ρ = density (kg/m3), μ = viscsity (Pa-s)
Diameter Calculations
Optimum Economic Diameter (Peters and Timmerhaus, 2004)
For Viscous Flow and Di ≥ 0.0254 m,
18.036.0, 133.0 fopti qD
D = opt pipe diameter (m), qf = vol. flowrate (m3/s), ρ = density (kg/m3), μ = viscsity (Pa-s)
Diameter Calculations
Optimum Economic Diameter (Peters and Timmerhaus, 2004)
For Viscous Flow and Di < 0.0254 m,
20.040.0, 133.0 fopti qD
D = opt pipe diameter (m), qf = vol. flowrate (m3/s), ρ = density (kg/m3), μ = viscsity (Pa-s)
Diameter Calculations
Based on Suggested Velocity
• 3-5 ft/s (liquids) and 50-100 ft/s (gases) Backhurst and Harker, 1973
•5.9-7.9 ft/s (liquids) and 30-131 (gases) economic optimum velocity , Perry
•5-10 ft/s (liquids) Baasel, 1974
Sample Problems
1. Pipe is to be specified for a water volumetric flowrate of 200 L/min and working temperature of 30ºC. Compute for the typical pipe diameter.
2. Pipe is to be specified for a water flowrate of 1500 L/min at 30ºC. Estimate for the minimum diameter required based on maximum fluid velocity
Sample Problems
3. Sulfuric acid with a volume flowrate of 50 L/min and temperature 30ºC is supplied through a pipeline. Calculate the pipe minimum diameter required.
4. Compute for the minimum pipe diameter requirement for the liquid flowing at of 550 L/min based on the reasonable velocity presented by Backhurst and Harker (1973).
Sample Problems
5. Methanol with a flowrate of 75 L/min is pumped from a storage tank. Estimate the minimum pipeline diameter (Sch 40) at the pump suction connecting the storage tank.
6. Carbon dioxide is flowing at a rate of 150 L/min inside a pipe. The temperature of the gas is 32 deg. C and the pipeline pressure is 150 psi. Calculate the minimum diameter of the pipe if the CO2 compressibility factor is 0.82 and the piping cost is 25 $/in/ft.