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.

𝐻_𝑎 − Adiabatic Head[ft • lb_f / lb_m]

𝑧_𝑠 − Compressibility Factor at Suction Conditions

𝑅_𝑐 − Specific Gas Constant[ft • lb_f / lb_m °𝑅]

𝑀𝑊 − Molecular Mass of Gas[lb/lb • mol]

𝑇_𝑠 − Gas Suction Temperature[°𝑅]

𝑘 =   − Specific Heat Ratio

𝑃_𝑑− Discharge Pressure[psia]

𝑃_𝑠 − Suction Pressure[psia]

CNGA/GPSA Compressibility Factor Approximation

𝑍 − Compressibility Factor

𝑃 − Pressure

𝑇_𝑓 − 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

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

Related Links