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Title: Beyond The Ordinary: Sample System Best Practices For Cryogenic Moisture And Hydrocarbon Dew Point Applications
Author: Daniel R. Potter, Colin Blakemore, Randy Hauer
Source: 2008 Natural Gas Sampling Technology Conference
Year Published: 2008
Abstract: Sampling techniques for BTU and moisture measurements are well understood but applications beyond the routine requires additional attention to detail. Two such applications are the subject of this paper. The first is the measurement of low level moisture (1 - 1,000 ppbv) for cryogenic processes. Measuring moisture below 1 ppm is an entirely different world from the traditional pipeline application because of the highly polar nature of the water molecule, as it tenaciously adheres to all surfaces in the sample system. Without consideration of these surface effects, sample transport and subsequent analyzer response is compromised. The second is measurement of the hydrocarbon dew point using a continuous device, a physical property rather than a quantitative method. The challenge is to sample the gas at pressure (or alternatively at a fixed inlet pressure), while separating oil, grease and liquid hydrocarbon without affecting the integrity of the sample gas.

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