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   
Measurement Planning
Method
Huntington 3-Point Schultz (ASME-PTC10)
Equation of State *
GERG-2008 (ISO20765-2) AGA8-92DC (ISO20765-1) CCS Mix. & Humid Gases

Process Section Data (Flange to Flange)

	Inlet Pressure MPa-a kPa-a Bar-a
	Inlet Temperature K Deg. C
	Mass Flow kg/h kg/s Nm3/h Sm3/h SCFM MMSCFD
	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-Heptane
	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.