API MPMS 12.2.5:2001 pdf download.Manual of Petroleum Measurement Standards Chapter12- Calculation of Petroleum Quantities
1 Purpose
1.1 When most of the older standards were witten, mechanical desk calculators were widely used for calculating measurement documentation, and tabulated values were used more widely than is the case today. Rules for rounding and the choice of how many figures to enter in each calculation step were often made on the spot. As a result, different opera- tors obtained di ferent results from the same data. 1.2 This multi-part publication consolidates and standard- izes calculations pertaining to metering petroleum liquids using turbine or displacement meters and clarifies terms and expressions by eliminating local variations of such terms. The purpose of standardizing calculations is to produce the same unbiased answer from the given data. For different operators to obtain identical results from the same data, the rules for sequence, rounding and discrimination of fgures (or decimal places) must be defined.
2 Scope
2.1 This part provides standardized calculation methods for the quantification of liquids and the determination of base prover volumes under defined conditions, regardless of the point of origin or destination or units of measure required by governmental customs or statute. The criteria contained in this document allows different entities using various com- puter languages on different computer hardware (or manual calculations) to arrive at identical results using the same stan- dardized input data. 2.2 This document also specifies the equations for comput- ing correction factors, rules for rounding, including the calcu- lational sequence, and discrimination levels to be employed in the calculations. No deviations from these specified equa- tions are permitted, since the intent of this document is to establish a rigorous standard. .
5 Terms and Symbols
Terms and symbols described below are acceptable and in common use for the calibration of flow meters. 5.1 DEFINITION OF TERMS 5.1.1 barrel (Bbl): A unit volume equal to 9,702.0 cubic inches, or 42.0 U.S. gallons. 5.1.2 base prover volume (BPV): The volume of the prover at base conditions, as shown on the calibration certifi- cate, and obtained by arithmetically averaging an acceptable number of consecutive calibrated prover volume (CPV) determinations. 5.1.3 calibrated prover volume (CPV): The volume at base conditions between the detectors in a unidirectional prover, or the volume of a prover tank between specified “empty”and“full” levels as determined by a single calibra- tion run. The calibrated volume (CPV) of a bidirectional prover is the sum of the two volumes swept out between detectors during a calibration round-trip. 5.1.4 cubic meter (m3): A unit of volume equal to 1,000,000.0 milliters (ml), or 1,000.0 liters. One cubic meter equals 6.28981 barrels.
API MPMS 12.2.5:2001 pdf download
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