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Title: Dynamics Of Vapor-Liquid Equilibrium In Pressurized Liquefied Calibration Standards
Author: Daniel Bartel
Source: 2014 Natural Gas Sampling Technology Conference
Year Published: 2016
Abstract: Pressurized liquid calibration standards are use in many points of the petrochemical refining process. They are used to evaluate incoming material, monitor process streams, assay final product purity, etc... These liquefied calibration standards are packaged in one of three ways: 1. In a floating piston cylinder pressurized above the bubble point of the mixture. 2. In a normal gas cylinder at saturation pressure. 3. In a normal gas cylinder pressurized using a helium pressurization gas, typically at 200 psig. Floating Piston cylinders have two chambers, separated by a floating piston. The sample gas is contained on one side of the piston the pressurization gas on the other side. Floating Piston cylinders are usually used when non- condensable gases such as methane, nitrogen or carbon monoxide, are to be assayed in a liquefied gas sample. Floating piston cylinders are the ideal cylinders for pressurized liquefied mixtures. There is no interaction between the liquefied sample gas and the pressurization gas and the sample can be pressurized well above the bubble point of the mixture.

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