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Title: Phase Measurement Of Dense Phase Fluids
Author: Ron Labus
Source: 2009 International School of Hydrocarbon Measurement
Year Published: 2009
Abstract: Dense phase measurement refers specifically to fluid measurement, of what is ostensibly a liquid regime, but due to the operating conditions encountered exhibits properties of both liquid and gas states. Most significant of these anomalies are increased compressibility and density values that are akin to a liquid while being neither a liquid or a gas a single phase plasma absent void fraction. From a mass measurement view point, this can result in a loss of correlation to published density tables for NGLs and a reliance on empirically derived tables for Ethylene. Historically this class has emphasized the difficulties encountered in the measurement of polymer grade ethylene. Ethylene is typically measured in dense phase a fluid regime encountered when a liquid enters the arena of critical pressure and temperature and becomes fluid plasma. Under these conditions it is neither gas nor liquid, but a plasma or dense phase material. Ethylene is not alone in terms of difficult liquid measurement made in dense phase regimes. The potential errors that result can produce serious problems for the unwary. While empirically derived tables have served the industry well in the case of ethylene, a better correlation may be possible for critical NGL measurement.

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