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Flow-X─ Function Reference
Introduction - API Petroleum Measurement Tables
Number
Title
5
API Gravity Reduction to 60°F
6
Reduction of Volume to 60°F Against API Gravity at 60°F
23
Reduction of Observed Specific Gravity to Specific Gravity 60/60°F
24
Reduction of Volume to 60o F Against Specific Gravity 60/60°F
53
Reduction of Observed Density to Density at 15°C
54
Reduction of Volume to 15°C Against Density at 15°C
59
Reduction of Observed Density to Density at 20°C
60
Reduction of Volume to 20°C Against Density at 20°C
In 2004 the API MPMS 11.1 1980 tables were superseded by a new set of tables primarily for the
following reasons:
API 11.1:2004 includes the correction for both temperature and pressure in one and the
same algorithm
Taken into account the progress in electronics (and for other reasons) the complex
truncating and rounding rules were abandoned. Instead the calculation procedures use
double-precision floating point math. The input and output values are still rounded in order
to obtain consistent results.
The convergence methods for the correction of observed density to base density have been
improved.
On-line density measurement by densitometers became common practice, requiring the
pressure and temperature correction to be incorporated in one ands the same procedure
The tables are extended in both temperature and density to cover lower temperatures and
higher densities.
The previous standard used a significant digit format which resulted in 4 or 5 decimal places
depending on whether the observed temperature was above or below the reference
temperature. The new standard prescribes 5 decimal places if or both cases.
The IP paper No. 3 tables were added to accommodate conversion to 20°C.
Tables for lubricating oils including the implementation procedures are now part of the standard.
Volume correction for pressure
The API MPMS 11.1:1980 Tables only cover the correction for temperature. The correction for pressure
was published in API MPMS standards 11.2.1 and 11.2.2.
The correction for pressure is to the atmospheric pressure or, for products within the lower density
range, to the equilibrium vapor pressure.
To calculate the equilibrium vapor pressure an Addendum was added to API MPMS 11.2.2. This
addendum is also known as GPA TP-15 (1988). In September 2007 the addendum was replaced by a
new API standard 11.2.5 and at the same time GPA TP-15 (1988) was updated with a new 2007
revision.
NGL and LPG tables
For NGL and LPG products volume correction tables 24E and 23E (at 60 °F) were published in GPA TP-25
(1988), so the letter 'E" was used to distinguish the tables from the related API MPMS A, B, C and D
tables.
GPA TP-25 has been superseded by GPA TP-27 / API MPMS 11.2.4 (2007), which includes tables 53E,
54E, 59E and 60E to convert to 15°C and 20°C as well. All text from TP-25 is included without technical
change, so TP-25 is still viable for conversion to and from 60 °F.
Summary of Contents for flow-x
Page 1: ...Function Reference Certified flow calculations Flow and batch calculations Worksheet functions...
Page 331: ...Flow X Function Reference 5 331 Flow X IO Functions fxPT100Table...
Page 349: ...Flow X Function Reference 6 349 This page is intentionally left blank for user notes...
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