Selection, Sizing and Analysis Tools for Centrifugal Compressors

Online Monitoring Of Efficiency

Reference Thermodynamic Data for Compressor Field Operation and Testing

Use this form in order to calculate compressor efficiency and consumed power based on online pressures and temperatures, i.e., read from the compressor monitoring system (measurement mode); alternatively set an assumed efficiency to calculate the compressor discharge temperature (planning mode). Gas composition is required as input. Mixture compounds available are according to the 21-compound system of the GERG-2008 equation of state. For CCS equation of state six compounds are available. After a calculation is performed, a link to the calculation will be provided which can be useful to share results between users.

Compressor Case   


Equation of State *

Process Section Data (Flange to Flange)
Inlet Pressure
Inlet Temperature
Mass Flow
Outlet Pressure (MPa-a)
Outlet Temperature (K)

Thermo-Mechanical Efficiency
Mech.Loss (kW)
η gearbox (%) **

Gas Analysis Results
Mol. Fraction % Inlet Flange
Methane Humidity (%)
Nitrogen Isentropic Coef. Kt
Carbon Dioxide Compressibility
Ethane Flow (Am3/h)
Propane Exit Flange
n-Butane Temperature
Isobutane Temperature Istr.
n-Pentane Isentropic Coef. Kt
Isopentane Compressibility
n-Hexane Flow (Am3/h)
n-Octane Δ Enthalpy (kJ/kg)
n-Nonane Head Istr. (kJ/kg)
n-Decane η Istr. (%)
Hydrogen Head Poly. (kJ/kg)
Oxygen η Poly. (%)
Carbon Monoxide Power @ Driver (kW)
Water Normal Flow (Nm3/h) ***
Hydrogen Sulfide ~ Size:
Helium Tip Speed (m/s)
Argon Work Input Fact.
Total % No. Stages.
MW  (kg/kmol)
* Only valid for fluids in homogeneous gas phase; ** When gearbox is not present, enter value as '100'; *** Normal conditions: 0 Deg.C, 1.013 bar-a ; standard conditions: 15 Deg.C, 1.013 bar-a
For GERG-2008 and AGA8 application limits, refer to standard ISO20765. For combustion gases (CCS): temperatures range from 220 to 700 K; pressures from 0 to 15 MPa.

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