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).