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API MPMS 14.3.3

Manual of Petroleum Measurement Standards Chapter 14 - Natural Gas Fluids Measurement Section 3 - Concentric, Square-Edged Orifice Meters Part 3 - Natural Gas Applications

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Organization: API
Publication Date: 1 January 1992
Status: inactive
Page Count: 111
scope:

APPLICATION

General

This part of Chapter 14, Section 3, has been developed as an application guide for the calculation of natural gas flow through a flange-tapped, concentric orifice meter, using the inch-pound system of units. For applications involving SI units, a conversion factor may be applied to the results (Qm, Qv, or Qb) determined from the equations in 3.3. Intermediate conversion of units will not necessarily produce consistent results. As an alternative, the more universal approach specified in Chapter 14, Section 3, Part 1, should be used. The meter must be constructed and installed in accordance with Chapter 14, Section 3, Part 2.

Definition of Natural Gas

As used in this part, the term natural gas applies to fluids that for all practical purposes are considered to include both pipeline- and production-quality gas with single-phase flow and mole percentage ranges of components as given in American Gas Association (A.G.A.) Transmission Measurement Committee Report No. 8, "Compressibility and Supercompressibility for Natural Gas and Other Hydrocarbon Gases." For other hydrocarbon mixtures, the more universal approach specified in Part 1 may be more applicable. Diluents or mixtures other than those stipulated in A.G.A. Transmission Measurement Committee Report No.8 may increase the flow measurement uncertainty.

BASIS FOR EQUATIONS

The computation methods used in this part are consistent with those developed in Part 1 and include the Reader-Harris/Gallagher equation for flange-tapped orifice meter discharge coefficient. The equation has been modified to reflect the more common units of the inch-pound system. Since the new coefficient of discharge equation does not address pipe tap meters, the pipe tap methodology of the 1985 edition of ANSI/API 2530 has been retained for reference in Appendix 3-D.

ORGANIZATION OF PART 3

Chapter 14, Section 3, Part 3, is organized as follows: Symbols and units are defined in 3.2, the basic flow equation is presented in 3.3, the key equation components are defined in 3.4, and the gas properties applicable to orifice metering of natural gas are developed in 3.5. All values are assumed to be absolute. Factors to compensate for meter calibration and location are included in Appendix 3-A. The factor approach to orifice measurement is included in Appendix 3-B. Appendix 3-C covers examples to assist the user in interpreting this part. Appendix 3-D covers pipe tap meters. Appendix 3-E covers SI conversions, Appendix 3-F covers heating value calculation, and Appendix 3-G covers derivation of constants. The user is cautioned that the symbols as defined in 3.2 may be different from those used in previous orifice metering standards.

Document History

November 1, 2013
Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids-Concentric, Square-edged Orifice Meters Part 3: Natural Gas Applications
General This part of API MPMS Ch. 14.3/AGA Report No. 3 has been developed as an application guide for the calculation of natural gas flow through a flange-tapped, concentric orifice meter, using...
March 1, 1994
Chapter 14 “Natural Gas Fluids Measurement,” Section 3, “Concentric, Square-Edged Orifice Meters,” Part 3, “Natural Gas Applications” of the Manual of Petroleum Measurement Standards, Third Edition, August 1992
A description is not available for this item.
August 1, 1992
Manual of Petroleum Measurement Standards Chapter 14 - Natural Gas Fluids Measurement Section 3 - Concentric, Square-Edged Orifice Meters Part 3 - Natural Gas Applications
General This part of Chapter 14, Section 3, has been developed as an application guide for the calculation of natural gas flow through a flange-tapped, concentric orifice meter, using the inch-pound...
API MPMS 14.3.3
January 1, 1992
Manual of Petroleum Measurement Standards Chapter 14 - Natural Gas Fluids Measurement Section 3 - Concentric, Square-Edged Orifice Meters Part 3 - Natural Gas Applications
APPLICATION General This part of Chapter 14, Section 3, has been developed as an application guide for the calculation of natural gas flow through a flange-tapped, concentric orifice meter, using the...
January 1, 1992
Manual of Petroleum Measurement Standards Chapter 14 - Natural Gas Fluids Measurement Section 3 - Concentric, Square-Edged Orifice Meters Part 3 - Natural Gas Applications Third Edition; Errata - 1994
A description is not available for this item.
January 1, 1992
Manual of Petroleum Measurement Standards Chapter 14 - Natural Gas Fluids Measurement Section 3 - Concentric, Square-Edged Orifice Meters Part 3 - Natural Gas Applications
3-A.1 Scope This appendix provides equations and procedures for adjusting and correcting field measurement calibrations of secondary instruments.

References

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