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Title: Research Results Of Cylinder Temperature Changes Which Occur During Spot Sampling
Author: Donald P. Mayeaux, Jay St. Amant
Source: 2007 Natural Gas Sampling Technology Conference
Year Published: 2007
Abstract: Spot and composite sampling with cylinders play an important role in determining the monetary value of Natural Gas. This form of sampling is often utilized when it is not economically feasible to install a permanent on-line analyzer. The API 14.1 and GPA 2166 working groups have focused much attention on the development of methods for spot and composite sampling. The consensus is that natural gas which is well above its Hydrocarbon Dew Point Temperature (HCDPT) is relatively easy to sample with cylinders. It is also the consensus that when the gas being sampled is at or near its HCDPT, obtaining a representative sample is difficult. This is especially true when sampling at low ambient temperatures. A contributing factor is that only recently has a representative sample been defined as the vapor phase of the gas at the pressure and temperature of the source.

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