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Title: Gas Quality Parameters Where Gas Composition Cannot Be Measured Online
Author: Eivind Nag Mosland, Camilla Stre, Askjell-Eivind Frysa
Source: 2019 North Sea Flow Measurement Workshop
Year Published: 2019
Abstract: At metering stations for custody transfer of natural gas, gas quality parameters such as molar mass, density at line and reference conditions and calorific value are found by calculations based on gas composition as measured by an online gas chromatograph. In metering stations upstream the custody transfer point it may not be cost-efficient to install gas chromatographs(GCs). In such situations, alternative means for determination of quality parameters must be considered. Furthermore, for possible future subsea custody transfer metering stations, use of gas chromatographs may not be technically possible. Finally, back-up solutions for a gas chromatograph can be beneficial, in particular for un-manned platforms.

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