American Petroleum Institute (API) Chapter 11.1 Equations

Flow-Cal, Inc. and the American Petroleum Institute (API) - Chapter 11.1 provides the algorithm and implementation procedure for the correction of temperature and pressure effects on density and volume of liquid hydrocarbons.

API Chapter 11.1 Volume Correction Factors

The American Petroleum Institute has joined forces with Flow-Cal, Inc. to develop, market, and support the API Chapter 11.1 code (Temperature and Pressure Volume Correction Factors for Generalized Crude Oils, Refined Products, Special Applications, and Lubricating Oils). This information is available in equations relating volume to pressure, which contains physical data that has direct application to volumetric measurement of liquid hydrocarbons.

Physical Properties Data

The subroutines for all the volumes of API Chapter 11.1 are now available in electronic form. This document contains the source code in C computer language to generate the various Volume Correction Factor tables. The source code may require modification for some computer systems to conform to the file naming convention of the computer system being used. 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, lubricating oils, and special applications.

Microsoft Excel® Add-in Program

The Excel Add-in function is a PC based spreadsheet for Microsoft Excel used to perform net corrected volume calculations for virtually all petroleum custody transfer and inventory control procedures. Users will be able to print customized VCF tables for API Gravity, density, and temperature.

For additional information or questions, please e-mail apistandards@flowcal.com or call (281) 282-0865.To order, download the API Order Form (pdf).


5A_6B

 

Volume Correction Factor Manuals

For those that prefer a quick look-up guide over an electronic version, printed temperature correction (CTL) tables of the API Chapter 11.1 – 2004 algorithms are also available. The VCF manuals are offered in an abridged version, providing the optimal table range, or the full version with the complete table range. Custom ranges are available upon request.

The complete library of VCF manuals is listed below in both the U.S. Customary
and SI Series.

To purchase these tables or request additional information, please Contact Us or phone
(281) 282-0865 to speak to our sales staff.

U.S. Customary Series

API Gravity
Volumes 1-8
Relative Density
Volumes 9-16
All books are published with gravity in Degree API at a 60 Degree Fahrenheit Base (using 0.5° gravity and 0.1° temperature increments). The abridged version is approximately 400 pages that include the following ranges: 15.0 – 89.9°API and 10.0 – 113.9°F. All books are published with Relative Density at a 60 Degree Fahrenheit Base (using 0.002 relative density and 0.1° temperature increments). The abridged version is approximately 400 pages that include the following ranges: 0.6390 – 0.9370 Relative Density
and 10.0 – 113.9°F.
Volume 1: 11.1.6.2 (Table 5A) Generalized Crude Oils Volume 9: 11.1.6.2 (Table 23A) Generalized Crude Oils
Volume 2: 11.1.6.1 (Table 6A) Generalized Crude Oils Volume 10: 11.1.6.1 (Table 24A) Generalized Crude Oils
Volume 3: 11.1.6.2 (Table 5B) Refined Products Volume 11: 11.1.6.2 (Table 23B) Refined Products
Volume 4: 11.1.6.1 (Table 6B) Refined Products Volume 12: 11.1.6.1 (Table 24B) Refined Products
Volume 5: 11.1.6.2 (Table 5C) Special Applications Volume 13: 11.1.6.2 (Table 23C) Special Applications
Volume 6: 11.1.6.1 (Table 6C) Special Applications Volume 14: 11.1.6.1 (Table 24C) Special Applications
Volume 7: 11.1.6.2 (Table 5D) Lubrication Oils Volume 15: 11.1.6.2 (Table 23D) Lubrication Oils
Volume 8: 11.1.6.1 (Table 6D) Lubrication Oils Volume 16: 11.1.6.1 (Table 24D) Lubrication Oils

SI Series

Kilogram per Cubic Meter at 15°C
Volumes 17-24
Kilogram per Cubic Meter at 20°C
Volumes 25-32
All books are published with density in Kilogram per Cubic Meter at a 15 Degree Celsius Base (using 2.0 kg/m3 and 0.05° temperature increments). The abridged version is approximately 450 pages that include the following ranges: 638.0 – 936.0 kg/m3
and -12.0 – 46.45°C.
All books are published with density in Kilogram per Cubic Meter at a 20 Degree Celsius Base (using 2.0 kg/m3 and 0.05° temperature increments). The abridged version is approximately 450 pages that include the following ranges: 638.0 – 936.0 kg/m3
and -12.0 – 46.45°C.
Volume 17: 11.1.7.2 (Table 53A) Generalized Crude Oils Volume 25: 11.1.7.2 (Table 59A) Generalized Crude Oils
Volume 18: 11.1.7.1 (Table 54A) Generalized Crude Oils Volume 26: 11.1.7.1 (Table 60A) Generalized Crude Oils
Volume 19: 11.1.7.2 (Table 53B) Refined Products Volume 27: 11.1.7.2 (Table 59B) Refined Products
Volume 20: 11.1.7.1 (Table 54B) Refined Products Volume 28: 11.1.7.1 (Table 60B) Refined Products
Volume 21: 11.1.7.2 (Table 53C) Special Applications Volume 29: 11.1.7.2 (Table 59C) Special Applications
Volume 22: 11.1.7.1 (Table 54C) Special Applications Volume 30: 11.1.7.1 (Table 60C) Special Applications
Volume 23: 11.1.7.2 (Table 53D) Lubrication Oils Volume 31: 11.1.7.2 (Table 59D) Lubrication Oils
Volume 24: 11.1.7.1 (Table 54D) Lubrication Oils Volume 32: 11.1.7.1 (Table 60D) Lubrication Oils