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API MPMS 14.3.3 ERRA Document Information:
Title
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
American Petroleum Institute
Publication Date:
Mar 1, 1994
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.
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