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).


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Printed API Volume Correction Factor Manuals

For those that prefer a quick look-up guide over an electronic version, printed tables of the VCF algorithms are also available for purchase. The API 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 printed 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
Volumes 1-8
Relative Density
Volumes 9-16
All books are published with gravity in Degrees API with 0.5°API increments and temperature in 0.1°F increments. The abridged version is approximately 400 pages with the following ranges: 15.0 – 89.9°API and 10.0 – 113.9°F

These eight volumes contain TABLES 5 and 6, the tables for the °API, °F, 60°F base series. Each volume contains specific data as follows:

All books are published with densities in Relative Density with 0.002 increments and Temperature in 0.1°F increments. The abridged version is approximately 400 pages with the following ranges: 0.6390 – 0.9370 Relative Density and 10.0 – 113.9°F

These eight volumes contain TABLES 23 and 24, the tables for the relative density, °F, 60°F base series.  Each volume contains specific data as follows:

Volume 1: Generalized Crude Oils (Table 5A) Volume 9: Generalized Crude Oils (Table 23A)
Volume 2: Generalized Crude Oils (Table 6A) Volume 10: Generalized Crude Oils (Table 24A)
Volume 3: Generalized Products (Table 5B) Volume 11: Generalized Products (Table 23B)
Volume 4: Generalized Products (Table 6B) Volume 12: Generalized Products (Table 24B)
Volume 5: Individual and Special Applications (Table 5C) Volume 13: Individual and Special Applications (Table 23C)
Volume 6: Individual and Special Applications (Table 6C) Volume 14: Individual and Special Applications (Table 24C)
Volume 7: Lubrication Oils (Table 5D) Volume 15: Lubrication Oils (Table 23D)
Volume 8: Lubrication Oils (Table 6D) Volume 16: Lubrication Oils (Table 24D)

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 densities in Kilogram per Cubic Meter with 2.0 increments and Temperature in 0.05°C increments. The abridged version is approximately 450 pages with the following ranges: 638.0 – 936.0 kg/m3 and -12.0 – 46.45°C

These eight volumes contain TABLES 53 and 54, the tables for the kilogram per cubic meter, °C, 15°C base series. Each volume contains specific data as follows:

All books are published with density in Kilogram per Cubic Meter with 2.0 increments and Temperature in 0.05°C increments. The abridged version is approximately 450 pages with the following ranges: 638.0 – 936.0 kg/m3 and -12.0 – 46.45°C

These eight volumes contain TABLES 59 and 60, the tables for kilogram per cubic meter, °C, 20°C base series. Each volume contains specific data as follows:

Volume 17: Generalized Crude Oils (Table 53A) Volume 25: Generalized Crude Oils (Table 59A)
Volume 18: Generalized Crude Oils (Table 54A) Volume 26: Generalized Crude Oils (Table 60A)
Volume 19: Generalized Products (Table 53B) Volume 27: Generalized Products (Table 59B)
Volume 20: Generalized Products (Table 54B) Volume 28: Generalized Products (Table 60B)
Volume 21: Individual and Special Applications (Table 53C) Volume 29: Individual and Special Applications (Table 59C)
Volume 22: Individual and Special Applications (Table 54C) Volume 30: Individual and Special Applications (Table 60C)
Volume 23: Lubrication Oils (Table 53D) Volume 31: Lubrication Oils (Table 59D)
Volume 24: Lubrication Oils (Table 54D) Volume 32: Lubrication Oils (Table 60D)