Patent ID: 7197403
Filing Date: 2007-03-27
Classification: G01N

Abstract:
1. A method for determining the density of a subject natural gas mixture, the gas mixture having known values for temperature, pressure, speed of sound, and diluent concentrations, comprising: accessing a set of reference speed of sound and density values, derived from a set of reference gas mixtures, at the known temperature and pressure; modeling the density of a gas mixture as a function of its speed of sound, a number of coefficients, and any diluent concentration values, thereby obtaining a model equation; using the reference speed of sound and reference density values to determine values for the coefficients; substituting the coefficient values and the known speed of sound and diluent concentration values of the subject gas into the model equation; solving the model equation to determine the density of the subject gas mixture; and storing a value representing the density in a computer-readable medium.