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Differential pressure flowmeter

  • Design for up to three operating points
  • Clear arrangement of the required inlet and outlet sections
  • Extended measurement uncertainty calculation according to ISO 5168 sensitivity coefficients 
  • Clear summary of all limitations of use
  • Calculation of segmental orifices with carrier rings 
  • Calculation of devices with drain holes
  • Calculations of pitot tubes with selection from an extensible equipment database
  • Calculations for non-standard flowmeters
  • Stress calculation for orifices (ASME 31.3/AD 2000/ISO 5167 etc.)
  • Calculation for humid gases with input of relative, specific, or absolute humidity
    Calculation for wet gas streams (vapor or gas with liquid content)

Supported flow elements:

  • Orifices
  • Nozzles
  • Venturi nozzles (also for critical flow)
  • Venturi tubes (also rectangular)
  • Averaging pitot tubes
  • Wedge flow meter 
  • Cone meter 
  • Integral flow orifice assembly
  • Manufacturer dependent special designs 

Supported calculation bases:

  • DIN 1952 (1980)
  • ISO 5167-1 (2022, 2003, 1998, 1995)
  • ISO 5167-2 (2022, 2003)
  • ISO 5167-3 (2022, 2020, 2003)
  • ISO 51674 (2022, 2003)
  • ISO 5167-5 (2022, 2016)
  • ISO 5167-6 (2022, 2019)
  • ISO 5168 (2005)
  • ISO/TR 9464 (2008)
  • ISO/TR 11583 (2012)
  • ISO/TR 12748 (2015)
  • ISO/TR 15377 (2018, 2007)
  • ISO 9300 (2022, 2005)
  • ASME MFC-3M-2004 (R2017)
  • ASME MFC-7 (2016, 1987-R2014)
  • ASME MFC-14M (2003)
  • ASME PTC 6 (2004)
  • ASME PTC 19.5 (2004)
  • AGA 3 / API MPMS 14.3 (2013, 2003)
  • GB/T 2624 (2006)
  • GOST 8.586 (2005)
  • VDI/VDE 2041 (1991)
  • R. W. Miller, Flow Measurement Engineering Handbook (1996)


Restriction orifice plates

  • Calculation of the internal diameter, differential pressure, volumetric flow and mass flow rate
  • Support for single- and multi-hole orifices 
  • Calculation of multi-stage expansion (automatic and manual) 
  • Improved calculation method considering the length of the cylindrical orifice 
  • Improved stress calculation (ASME 31,3/AD 2000/ISO 5167 etc.)
  • Revised forecast of choked-flow conditions
  • Calculation of the Vena Contracta and outlet conditions 
  • Support of liquids containing dissolved gas 
  • Calculation of the energy balance (power loss) and the sound pressure level
  • Enhanced noise prediction for restriction orifice plates by the adapted calculation according to IEC 60534-8-3 respectively IEC 60534-8-4. 
  • Orifice plates with drain holes can be calculated.
  • The range of validity had been enhanced to β > 0,75.