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Title: Peng-Robinson Equation Of State Natural Gas Dew Points
Author: Kenneth E. Starling
Source: American Gas Association 2003
Year Published: 2003
Abstract: A method is presented for accurate calculations of dew points of natural gases in operating gas pipelines. From a typical gas chromatographic analysis coupled with a single chilled mirror or other dew point temperature measurement at pipeline pressure, the gas analysis is extended mathematically so the Peng- Robinson equation of state will match the single measured dew point. The resultant extended analysis then can be used with confidence of acceptable accuracy even when the flowing gas composition changes within specified tolerance limits. The benefit to the industry of this method is the fact that the extreme accuracy required for the use of an extended analysis chromatogram alone is avoided.

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