Centrifugal Compressor – Adiabatic Head

Using the centrifugal compressor application resets when the head is developed by increasing gas velocity to create kinetic energy. As compression ratio drops, adiabatic efficiency drops.
One limitation of the calculation is that it does not consider the heat gained or lost.

PTLB Compressors 2.1_Intro.png
𝐻𝑎 − Adiabatic Head[ft • lbf / lbm]
𝑧𝑠 − Compressibility Factor at Suction Conditions
𝑅𝑐 − Specific Gas Constant[ft • lbf / lbm °𝑅]
𝑀𝑊 − Molecular Mass of Gas[lb/lb • mol]
𝑇𝑠 − Gas Suction Temperature[°𝑅]
𝑘 =  PTLB Compressors K Formula.png − Specific Heat Ratio
𝑃𝑑− Discharge Pressure[psia]
𝑃𝑠 − Suction Pressure[psia]
CNGA/GPSA Compressibility Factor Approximation
PTLB Compressors 2.1_Intro 2.png
𝑍 − Compressibility Factor
𝑃 − Pressure
𝑇𝑓 − Gas Flowing Temperature[°𝑅]

This approximation will produce results sufficiently accurate for preliminary calculations.
 
 

Input Parameters

  1. To create a new case, click the “Add Case” button
  2. Select the Centrifugal Compressor – Adiabatic Head application from the Pipeline Compressor module.
  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.

  • Base Pressure(psi)
  • Base Temperature(°F)
  • Suction Pressure(psi)
  • Suction Temperature(°F)
  • Discharge Pressure(psi)
  • Gas Specific Heat Ratio
  • Adiabatic Efficiency
  • Compressibility Factor

PLTB Compressors 2.1_Input Rev_090120.png

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.

  • Discharge Temperature(°F)
  • Z1 – Compressibility Factor at Suction Conditions
  • Adiabatic Head (ft lbf/lbm)
  • Adiabatic GHP per Unit of the Flowrate

PLTB Compressors 2.1_Output Rev_090120.png

Related Links

Pipeline HUB — User Resources

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