Specific gravity is one of the basic properties used for characterization and measurement of natural gases. Many instruments and methods are available for measurement of specific gravity of natural gases. These devices vary in their operating principles, efficiency and accuracy. However, there are not readily available references and guidelines for the user to choose between various options for specific applications.

The present paper critically evaluates and compares the frequently used gravity measurement methods in various terms. Specifically, each method is described and its operating principle and the governing equations are analyzed, Then, an assessment of the measurement error is carried out.

The confidence limits for the random error are determined. Error analysis is presented for typical data. Finally, a comparison of various methods is presented in a systematic manner for reference.

You can access this article if you purchase or spend a download.