API MPMS 12.2.1 ERTA Manual of Petroleum Measurement Standards Chapter 12 - Calculation of Petroleum Quantities Section 2 - Calculation of Petroleum Quantities Using Dynamic Measurement Methods and Volumetric Correction Factors Part 1 - Introduction
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API MPMS 12.2.1 ERTA Document Information:
Title
Manual of Petroleum Measurement Standards Chapter 12 - Calculation of Petroleum Quantities Section 2 - Calculation of Petroleum Quantities Using Dynamic Measurement Methods and Volumetric Correction Factors Part 1 - Introduction
American Petroleum Institute
Publication Date:
Jul 1, 2009
Scope:
This document 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 the units of measure required by governmental
customs or statute. The criteria contained in this document allow
different entities using various computer languages on different
computer hardware (or manual calculations) to arrive at identical
results using the same standardized input data.
The publication rigorously specifies the equations for computing
correction factors, rules for rounding, calculational sequence, and
discrimination levels to be employed in the calculations. No
deviations from these specifications are permitted since the intent
of this document is to serve as a rigorous standard.
Purpose
When most of the older standards were written, 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 operators obtained different results
from the same data.
This five-part publication consolidates and standardizes
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. So that different operators can obtain
identical results from the same data, the rules for sequence,
rounding, and discrimination of figures (or decimal places) have
been defined.
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