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Title: Techniques Of Gas Spot Sampling
Author: Jane Williams
Source: 2017 International School of Hydrocarbon Measurement
Year Published: 2017
Abstract: This paper discusses the various approved methods used for spot sampling in the natural gas industry. Proper sampling technique is extremely important because it impacts both the quantity and quality of the gas being measured. Up until 1978 when congress passed the Natural Gas Policy Act, natural gas was sold based on volume. The Natural Gas Policy Act implemented selling of natural gas based on the energy available in the gas being sold. Consequently, the importance of sampling to determine the BTU content of the natural gas sold became much more important. The energy available in a gas stream is the product of the volume and the BTU content of the gas sold. In order to determine the BTU content of the gas, a representative sample must be captured and analyzed by a gas chromatograph or calorimeter. Typically, the industry utilizes gas chromatographs to make this determination. The sampling method is frequently a function of the volume of gas sold over the period. If the volume sold is relatively small the technique used is usually the spot sampling method, which is the method covered in this paper. In spot sampling, the sample is obtained and transported to a laboratory for analysis by a gas chromatograph. If significant volume is transferred over the period, a composite sample might be captured and analyzed.

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