Thermo Scientific Gas Chromatograph Analyzers - Natural Gas Analyzer for GPA 2186

Importance of Natural Gas Liquid Analysis

Accurate measurement of heating value and composition of natural gas liquids (NGLs) is crucial for custody transfer, quality control and process optimization in the oil and gas industry. Compliance with GPA Method 2186 ensures consistency and reliability in reporting BTU content and hydrocarbon distribution, impacting commercial transactions and operational safety.

Aim and Overview of the Study

This white paper introduces the Thermo Scientific Natural Gas Analyzer designed to perform GPA 2186–compliant analysis of single NGL samples. The system leverages a dual‐channel approach on the TRACE 1310 gas chromatograph to simultaneously determine gross heating value (C7+ regroup BTU) and detailed hydrocarbon profiles (C1–C16).

Methodology

The analytical method uses two parallel GC channels:

• Channel One (TCD): Measures C7+ regroup BTU using a thermal conductivity detector and packed columns to quantify major components and grouped heavier hydrocarbons.
• Channel Two (FID): Provides detailed quantification of individual C1–C16 hydrocarbons with a flame ionization detector and a capillary column.

The NGL sample is introduced via high‐pressure liquid injection valves into independently heated oven compartments. The procedure enables simultaneous determination of BTU and individual hydrocarbon constituents within a single run.

Used Instrumentation

• Thermo Scientific TRACE 1310 gas chromatograph base unit.
• Channel One: Thermal conductivity detector, two packed columns, high‐pressure injection valve, sulfur‐resistant tubing.
• Channel Two: Flame ionization detector, single capillary column, high‐pressure injection valve.
• Independent valve ovens for each channel, nitrogen (air composite) and detector gases.

Main Results and Discussion

Validation data demonstrate repeatability better than 1.0% for both channels. Method detection limits for hydrocarbons are as low as 0.005% on the TCD channel and 0.001% on the FID channel. Chromatograms show clear separation of light gases (C1–C6) and regrouped C7+ fractions, as well as baseline resolution of individual components up to n‐hexane and beyond on the extended channel.

Benefits and Practical Applications

• Fully automated, dual‐channel analysis reduces operator intervention and turnaround time.
• Simultaneous BTU calculation and compositional breakdown support custody transfer, regulatory reporting and process monitoring.
• Robust design with sulfur‐resistant flow paths enhances uptime when analyzing sour or contaminated samples.

Future Trends and Opportunities

Integration of advanced data analytics and remote monitoring will drive proactive maintenance and real‐time quality assurance. Expansion of detector technologies, such as micro‐GC and selective surface acoustic wave sensors, may further improve sensitivity and reduce analysis time. Customized methods for new refrigerant and renewable gas streams will broaden the application scope.

Conclusion

The Thermo Scientific Natural Gas Analyzer for GPA 2186 provides a reliable, dual‐channel GC solution for comprehensive NGL analysis, delivering precise BTU values and detailed hydrocarbon profiles in a single automated workflow.