Natural Gas Fluids Measurement: Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids – Concentric, Square-Edged Orifice Meters – Part 3: Natural Gas Applications, Fourth Edition
For applications involving international system (SI) of units, a conversion factor can be applied to the results (Qm, Qv , or Qb) determined from the equations in 4.3. Intermediate conversion of units will not necessarily produce consistent results. As an alternative, the more universal approach specified in API MPMS Ch. 14.3.1/AGA Report No. 3, Part 1 can be used. The meter has to be constructed and installed in accordance with API MPMS Ch. 14.3.2/AGA Report No. 3, Part 2.