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API MPMS 11.1 Document Information:
Title
Manual of Petroleum Measurement Standards Chapter 11—Physical Properties Data Section 1—Temperature and Pressure Volume Correction Factors for Generalized Crude Oils, Refined Products, and Lubricating Oils
American Petroleum Institute
Publication Date:
May 1, 2004
Scope:
This Standard provides the algorithm and implementation
procedure for the correction of temperature and pressure effects on
density and volume of liquid hydrocarbons which fall within the
categories of crude oil, refined products, or lubricating oils;
NGLs and LPGs are excluded from consideration in this Standard. The
combination of density and volume correction factors for both
temperature and pressure is collectively referred to in this
Standard as a Correction for Temperature and Pressure of a Liquid
(CTPL). The temperature portion of this correction is termed the
Correction for the effect of Temperature on Liquid (CTL), also
historically known as VCF (Volume Correction Factor). The pressure
portion is termed the Correction for the effect of Pressure on
Liquid (CPL). As this Standard will be applied to a variety of
applications the output parameters specified in this Standard (CTL,
Fp, CPL, and CTPL) may be used as specified in
other API Manual of Petroleum Measurement Standards (MPMS)
Chapters.
Including the pressure correction in this Standard represents an
important change from the "temperature only" 1980 Tables. However,
if the pressure is one atmosphere (the standard pressure) then
there is no pressure correction and this Standard will give
CTL values consistent with the 1980 Tables.
This Standard provides general procedures for the conversion of
input data to generate CTL, Fp, CPL, and CTPL
values at the user specified base temperature and pressure
(Tb, Pb). This section
is then followed by two sets of procedures for computing volume
correction factor, one set for data expressed in customary units
(temperature in °F, pressure in psig), the other for the metric
system of units (temperature in °C, pressure in kPa or bar). In
contrast to the 1980 Tables, the metric procedures require the
procedure for customary units be used first to compute density at
60°F. This value is then further corrected to give the metric
output.
The procedure recognizes three distinct commodity groups: crude
oil, refined products, and lubricating oils. A special application
category is also provided which provides volume correction based on
the input of an experimentally derived coefficient of thermal
expansion.
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