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Title: Constant Pressure Sample Cylinders
Author: David J. Fish
Source: 1997 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1997
Abstract: The gas industry has used single cavit Standard Cylinders for many decades, for the purpose of obtaining samples for laboratory analysis. In early years, the spot sampling method was used where by the gas was introduced into the cylinder until it reached line pressiure. and then was transported to the laboratory for calorimeter or chromatograph analysis. As the known qualit of the gas (BTU value) became more important, tests were conducted to determine if the gas was being altered by the procedure used to fill cylinders. It was determined that contaminates such as air were being introduced to the collected sample and a new filling method was needed. The fill and purge method was adopted and after sometime it was determined thai retrograde condensation was occurring by this process and thus a newer method was created. This newer method is known as the GPA method using a manifold for filling the Standard Cylinder, This GPA method reduced the negative effects of the filling only procedure. The manifold allows gas to be trapped in the cylinder at full pressure, rather than simply dead ended into the cylinder, i.e. zero pressure up to line pressure.

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