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CCM Working Group on Fluid Flow (CCM-WGFF)

Terms of reference

The Working Group for Fluid Flow supports the CCM, the CIPM MRA, and NMIs to establish and maintain a validated and robust global measurement system for flow and related quantities:

  1. liquid flow (i.e. water, hydrocarbon liquids, cryogenic liquids),
  2. gas flow (air, nitrogen, natural gas, etc.),
  3. liquid volume (from microliters to thousands of liters), and
  4. the speed of fluids (air speed and water speed).

Within this objective, its tasks are to:

    Facilitate the assembly of approved CMCs in the KCDB, including:
    1. ensuring that the general instructions, formatting, and inter-regional review process are followed,
    2. developing service categories that cover necessary measurands,
    3. ensuring the definitions of CMC uncertainty are clear and consistently applied,
    4. providing CMC review criteria in order to facilitate the CMC revision process,
    5. serving as a forum for discussion and resolution of questions raised during inter-RMO review of CMCs, and
    6. periodically reviewing CMCs for correctness.

    Conduct comparisons to demonstrate the proficiency of NMIs and DIs and to verify that CMCs are correct, including:
    1. identifying where comparisons are needed,
    2. recommending comparisons to the CCM for approval,
    3. selecting pilot labs and participants,
    4. assisting pilot labs in developing protocols that meet the Guidelines for CIPM KCs,
    5. assisting or advising pilot labs with the data analysis and KC report writing,
    6. performing the Draft B KC report review process,
    7. assessing CMC uncertainty claims based on comparison results,
    8. reviewing regional comparison reports, and
    9. submitting comparison reports to the CCM for approval and posting on the KCDB;

    Provide a forum of exchange between NMIs, DIs, and RMOs, provide supplementary guidelines and/or interpretations of CIPM and CCM policies for the flow measurement community, advise the CCM and the CIPM on flow related matters, and encourage and support laboratories developing new flow standards.


  • Dr Bodo Mickan  (PTB)


  • Dr Chunhui Li  (NIM)


  • BEV (Bundesamt für Eich- und Vermessungswesen)
  • CENAM (Centro Nacional de Metrología)
  • CMI (Czech Metrology Institute)
  • GUM (Central Office of Measures)
  • INMETRO (Instituto Nacional de Metrologia, Qualidade e Tecnologia)
  • INRIM (National Institute of Metrological Research/Istituto Nazionale di Ricerca Metrologica)
  • IPQ (Instituto Português da Qualidade)
  • KRISS (Korea Research Institute of Standards and Science)
  • LNE-LADG (Laboratoire Associé de Débitmétrie Gazeuse)
  • METAS (Federal Institute of Metrology METAS)
  • NIM (National Institute of Metrology)
  • NIST (National Institute of Standards and Technology, United States Department of Commerce)
  • NMIA (National Measurement Institute, Australia)
  • NMIJ/AIST (National Metrology Institute of Japan, AIST)
  • NMISA (National Metrology Institute of South Africa)
  • NRC (National Research Council of Canada)
  • PTB (Physikalisch-Technische Bundesanstalt)
  • RISE (RISE Research Institutes of Sweden AB)
  • TUVNEL (TUVNEL, formerly National Engineering Laboratory)
  • VSL (VSL Dutch Metrology Institute)
  • RMO Technical Committee chairs in the field of Mass and Related Quantities or their representatives

  CCM: Upcoming meetings
17–21 May 2021: 18th meeting of the CCM and related meetings

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Workshop on the mise en pratique (Nov. 2012)