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ASTM D 1250 Document Information:
Title
Standard Guide for Use of the Petroleum Measurement Tables
ASTM International
Publication Date:
Sep 1, 2008
Scope:
The API MPMS Chapter 11.1–2004/Adjunct to IP 200/
04/Adjunct to ASTM D 1250–04 (ADJD1250CD) for temperature and
pressure volume correction factors for generalized crude oils,
refined products, and lubricating oils, provides the algorithm and
implementation procedure for the correction of temperature and
pressure effects on density and volume of liquid hydrocarbons.
Natural gas liquids (NGLs) and liquefied petroleum gases (LPGs) are
excluded from consideration. The combination of density and volume
correction factors for both temperature and pressure is
collectively referred to in the standard/adjunct(s) 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/adjunct(s) (CTL,
Fp, CPL, and CTPL) may be used as specified in
other standards.
Including the pressure correction in API MPMS Chapter
11.1–2004/Adjunct to IP 200/04/Adjunct to ASTM D 1250–04
(ADJD1250CD) represents an important change from the "temperature
only" correction factors given in the 1980 Petroleum Measurement
Tables. However, if the pressure is one atmosphere (the standard
pressure) then there is no pressure correction and the
standard/adjunct(s) will give CTL values consistent with the 1980
Petroleum Measurement Tables.
API MPMS Chapter 11.1–2004/Adjunct to IP 200/04/
Adjunct to ASTM D 1250–04 (ADJD1250CD) covers 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). Two sets of procedures are included 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 Petroleum Measurement 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 metric procedures now
incorporate the base temperature of 20°C in addition to 15°C.
The procedures recognize three distinct commodity groups: crude
oil, refined products, and lubricating oils. A procedure is also
provided for determining volume correction for special applications
where the generalized commodity groups' parameters may not
adequately represent the thermal expansion properties of the liquid
and a precise thermal expansion coefficient has been determined by
experiment.
Keywords:
- crude oil
- density correction
- lubricants
- lubricating oils
- Petroleum Measurement Tables
- petroleum products
- volume correction
- volume correction factor
- density
- gravity
- hydrometer
- temperature
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