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Title: Light Hydrocarbon Liquid Sampling
Author: Garrett Lalli
Source: 2004 International School of Hydrocarbon Measurement
Year Published: 2004
Abstract: Identifying the individual hydrocarbons in a light liquid hydrocarbon stream is essential in the determination of the dollar value of the product being purchased or sold. It is also very crucial to the process of auditing plant performance and system balance. To satisfy these business needs, light liquid hydrocarbon sampling systems and proper sampling techniques are fundamentally required. A typical sampling system application is one that is used on a mass measurement station. The primary instruments of a station include a turbine meter, temperature probe, pressure transducer, and a densitometer to determine the volume and density of the product. By measuring these variables, we determine mass (volume x density mass). While the station is calculating mass per metered volume, a sampling system is taking small samples of the flowing stream and storing them in an accumulator. The liquid phase composite sample retrieved is injected into a chromatograph and each component, along with its molecular weight fraction, is identified. Knowing the molecular weight fraction of each component, as well as the total mass of each volumetric unit measured, makes it possible to determine how much of each hydrocarbon component is contained in each volumetric unit sold.

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