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API MPMS Chapter 13.3 Manual of Petroleum Measurement Standards, Measurement Uncertainty, First Edition
Handbook / Manual / Guide by American Petroleum Institute, 05/01/2016
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FIRST EDITION, MAY 2016
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Copyright © 2016 American Petroleum Institute
This standard is in response to the call by industry and regulators for a standardized method to determine the uncertainty associated with various aspects of petroleum measurement. This method is based on the 2008 edition of the International Organization of Standards (ISO) Guide to the Expression of Uncertainty in Measurement (GUM)- JCGM 100:2008-which was developed to be a guide for the writers of technical standards.
Although this document could be used for analysis of an entire system or facility, that use is outside the scope of the document.
The uncertainty estimate is only as good as the underlying data and engineering judgment. All of the numerical values used and assumptions made must be documented. The statement in Section 3.4 of the ISO GUM reproduced below applies to this standard:
“Although this Guide provides a framework for assessing uncertainty, it cannot substitute for critical thinking, intellectual honesty and professional skill. The evaluation of uncertainty is neither a routine task nor a purely mathematical one; it depends on detailed knowledge of the nature of the measurand and of the measurement. The quality and utility of the uncertainty quoted for the result of a measurement therefore ultimately depend on the understanding, critical analysis and integrity of those who contribute to the assignment of its value.”
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Measurement Uncertainty
This standard establishes a methodology to develop uncertainty analyses for use in writing API Manual of Petroleum Measurement Standards (MPMS) documents that are consistent with the ISO GUM and NIST Technical Note 1297.
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
API Manual of Petroleum Measurement Standards (MPMS) Chapter 12, Calculation of Petroleum Quantities, Section 2—Calculation of Liquid Petroleum Quantities Measured by Turbine or Displacement Meters, 1981
API MPMS Chapter 13, Statistical Aspects of Measuring and Sampling, Section 1—Statistical Concepts and Procedures in Measurements, 1985, Reaffirmed 2011
API MPMS Chapter 13, Statistical Aspects of Measuring and Sampling, Section 2—Methods of Evaluating Meter Proving Data, 1994, Reaffirmed 2011
API MPMS Chapter 14.3, (AGA Report No. 3, Part 1), Concentric, Square-Edged Orifice Meters, Part 1—General Equations and Uncertainty Guidelines, 2012
API MPMS Chapter 22.1, Testing Protocols—General Guidelines for Developing Testing Protocols for Devices Used in the Measurement of Hydrocarbon Fluids, 2006, Reaffirmed 2011
Coleman, H.W., and Steele, W.G., Experimentation and Uncertainty Analysis for Engineers, Third Edition, New York: John Wiley & Sons, 2009
Harter, H.L., “Tables of Range and Studentized Range,” Annals of Mathematical Statistics, vol. 31, Beachwood, OH, 1960, pp. 1122–1147
JCGM 100:2008, Evaluation of measurement data—Guide to the expression of uncertainty in measurement, GUM 1995 with minor corrections, 2008
JCGM 101:2008, Evaluation of measurement data—Supplement 1 to the “Guide to the expression of uncertainty in measurement”—Propagation of distributions using a Monte Carlo method, GUM 1995 with minor corrections, 2008
JCGM 200:2012, International vocabulary of metrology—Basic and general concepts and associated terms (VIM), 2012
Olkin, I., “Range Restrictions for Product-Moment Correlation Matrices,” Psychometrika, December 1981, vol. 46, Issue 4, pp. 469–472
Taylor, B.N., and Kuyatt, C.E., Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results, NIST Technical Note 1297, 1994
Wheeler, D.J., EMP III: Evaluating the Measurement Process & Using Imperfect Data, SPC Press, 2006
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