AGA Fully Turbulent Flow

This is one of the most recommended and used equations for this type of flow, being able to estimate with high precision flow and pressure drop values if pipe roughness is known with correctness. It has been used for comparison among the different flow equations as a reference basis because it is fundamental to the definition of the corresponding application ranges and errors.

Similar to the Colebrook Equation, the AGA Equation uses a slightly modified transmission factor in order to obtain a value for the pressure drop using the General Flow Equation. The transmission value for the AGA equation is the following:

This equation is also known as the Von Karman equation for rough pipe flow.
๐น โˆ’ Transmission Factor
๐‘˜ โˆ’ Pipe Roughness
๐ท โˆ’ Internal Diameter (in)

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๐‘„ โˆ’ Flow Rate (FT3/day)
๐ถ๐‘„ย โˆ’ 38.774
๐‘‡๐‘ย โˆ’Temperature Base (ยฐR)
๐‘ƒ๐‘ย โˆ’ Pressure Base (psi)
๐‘‡๐‘“ย โˆ’ Gas Flowing Temperature (ยฐR)
๐ท โˆ’ Internal Diameter (in)
๐‘˜ โˆ’ Pipe Roughness
๐‘ƒ1ย โˆ’ Upstream Pressure (psi)
๐‘ƒ2ย โˆ’ Downstream Pressure (psi)
๐บ โˆ’ Gas Specific Gravity
๐‘ โˆ’ Compressibility Factor
Leย โˆ’ Pipe Segment Length including Expansion (mi)
๐‘‡๐‘“ย โˆ’ Gas Flowing Temperature (ยฐR)

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๐‘  โˆ’ Elevation adjustment parameter
CS โˆ’ 0.0375
๐‘ โˆ’ Compressibility Factor
๐‘‡๐‘“ โˆ’ Gas Flowing Temperature (ยฐR)
โˆ†๐ป๐บ โˆ’ Change in Elevation (ft)

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๐ฟ๐‘’ โˆ’ Pipe Segment Length including Expansion (mi)
๐‘  โˆ’ Elevation adjustment parameter

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๐‘‰ โˆ’ Velocity (ft/sec)
๐‘„โ„Ž โˆ’ Volumetric flow rate (scf/hr)
๐ท โˆ’ Internal Diameter (in)
๐‘ƒ๐‘Ž๐‘ฃ๐‘” โˆ’ Average Pipeline Pressure (psia)

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๐…๐จ๐ซ ๐ฌ๐ฆ๐š๐ฅ๐ฅ ๐ฉ๐ซ๐ž๐ฌ๐ฌ๐ฎ๐ซ๐ž ๐๐ซ๐จ๐ฉ ๐‘ท๐Ÿ > ๐ŸŽ.๐Ÿ–๐‘ท๐Ÿ:

๐…๐จ๐ซ ๐ฅ๐š๐ซ๐ ๐ž ๐ฉ๐ซ๐ž๐ฌ๐ฌ๐ฎ๐ซ๐ž ๐๐ซ๐จ๐ฉ:

Input Parameters

  1. To create a new case, click the โ€œAdd Caseโ€ button
  2. Select the Unknown and desired Flow Equation
  3. Enter Case Name, Location, Date, and any necessary notes
  4. Fill out all required fields
  5. Make sure the values you are inputting are in the correct units
  6. Click the CALCULATE button
  • Temperature base(ยฐF)
  • Pressure base(psia)
  • Gas Flowing Temperature(ยฐF)
  • Gas Specific Gravity
  • Compressibility Factor
  • Pipeline Efficiency Factor
  • Upstream Pressure(psig)
  • Flow Rate(MCFD)
  • Internal Pipe Diameter(in)
  • Length of Pipeline(mi)
  • Upstream Elevation(ft)
  • Downstream Elevation(ft)

Outputs/Reports

  1. View the results
  2. If an input parameter needs to be edited be sure to hit the CALCULATE button after the change
  3. To SAVE, fill out all required case details then click the SAVE button
  4. To rename an existing file, click the SAVE As button. Provide all case info then click SAVE
  5. To generate a REPORT, click the REPORT button
  6. The user may export the Case/Report by clicking the Export to Excel/PowerPoint icon
  7. To delete a case, click the DELETE icon near the top of the widget.
  • Flow Rate(ft/sec.)
  • Transmission Factor
  • Velocity(ft/sec.)
  • Upstream Pressure(psi)
  • Transmission Factor
  • Velocity(ft/sec.)
  • Downstream Pressure(psi)
  • Transmission Factor
  • Velocity(ft/sec.)
  • Internal Pipe Diameter(in)
  • Transmission Factor
  • Velocity(ft/sec.)
  • Erosional Velocity
  • Sonic Velocity

Flow Rate

Upstream Pressure

Downstream Pressure

Internal Pipe Diameter

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