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Title: Sample Conditioning Natural Gas For On Line Hydrocarbon Dew Point Determination
Author: Andy Benton
Source: 2008 Natural Gas Sampling Technology Conference
Year Published: 2008
Abstract: Sampling and sample conditioning for successful on-line measurement of hydrocarbon dew point requires full attention to the unusual requirements specific to this parameter. Aspects covered in this paper include: Correct sample gas extraction to ensure that composition is representative of majority pipeline flow, Sample line handling at pipeline process conditions to maintain sample integrity, Consideration to filtration to ensure that the analyzer is protected from contamination, by entrained liquids or pipeline slugs, whilst ensuring that the full magnitude of any high excursions in process gas hydrocarbon dew point are registered, Consideration to phase envelope characteristics to ensure that sufficiently high temperature is maintained when reducing sample pressure to intermediate levels (cricondentherm condition) required for analysis of this parameter according to gas quality tariff specifications, Thought is also applied to the extreme scenario of a gas pipeline carrying liquid condensates as well as the optimum system configuration for the most commonplace application to confirm conformance to transmission pipeline gas quality tariff specifications.

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