Flow calculations at your fingertips
Spirit IT Flow-Xpert

Spirit IT Flow-Xpert Calculation Software offers the most comprehensive and complete library on the market to date. The calculations have been verified by many of the world’s leading metrology testing agencies, as well as end-user experts in our flow products.



Spirit IT Flow-Xpert is based on the Spirit IT Flow-X flow computer calculation library that is used in numerous installations and is verified by many test laboratories and oil and gas companies. It provides all the typical fluid and hydrocarbon property calculations used for custody measurement (AGA, API, ASTM, GERG, GPA, ISO etc.).

The free iOS and Android apps can be used to verify single calculations. The Excel add-in allows you to build your own tool to verify and audit flow computers, volume correctors, EFM's and RTUS. The DLL interface allows for the integration of proven oil and gas calculations in any automation system.

Spirit IT Flow-Xpert supports both the metric and US Customary versions of the AGA and API implementations.


Calculations supported:

  • AGA3, AGA5, AGA8, AGA10, AGA-NX-19
  • GERG-2004, GERG-2008, SGERG
  • API 11.1 (Tables 5, 6, 23, 24, 53, 54, 59, 60), API 11.2, Historical API 1952 tables, API, API, API Table E NGL/LPG (TP27)
  • ASTM D1550 CTL, D1550 Rel. Density, ASTM D4311M, ASTM D1550, D3588, D411
  • GOST8-586
  • ISO-5167, ISO-6976
  • GPA-2172, GPA-TP15
  • IAPWS-IF97 steam and water tables
  • NIST-CO2, NIST-Ethylene Viscosity, NIST-1045 Ethylene
  • IUPAC Ethylene
  • VCone calculations


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