Hydrocarbon Gas Analysis Applications.

Frequently Asked Questions

• What hydrocarbon gas applications can be analysed with Ellutia GC systems?

  Ellutia GC systems are configured for natural gas composition analysis and LPG composition testing. Both applications use the 200 Series GC as the instrument platform, configured with appropriate detectors, columns and sampling hardware for each gas type.

• What is the difference between natural gas analysis and LPG analysis by GC?

  Natural gas analysis requires measurement of both permanent gases and hydrocarbons, which need different detectors. A dual-detector configuration combining a TCD and FID is the standard approach. LPG analysis focuses on hydrocarbons in the C3 to C5 range and uses a flame ionisation detector. LPG is also introduced to the GC differently: it is a pressurised liquid that requires either liquid or vapour sampling, whereas natural gas is introduced as a gas phase sample.

• What properties can be calculated from hydrocarbon gas composition data?

  For natural gas, calculated outputs include calorific value (superior and inferior), Wobbe Index, specific gravity, real density and compressibility factor. For LPG, composition data is used to calculate vapour pressure and density. Calculations are performed automatically by the Clarity data station software in compliance with the relevant standards.

• Which standards do Ellutia GC systems comply with for hydrocarbon gas analysis?

  For natural gas: ASTM D1945, ISO 6974, ISO 6976, ASTM D3588 and GPA 2172. For LPG: ASTM D2163, ASTM D2598 and ASTM D2421. Both configurations are designed to produce results in compliance with recognised international standards.

• Where are Ellutia GC systems used for hydrocarbon gas analysis?

  Natural gas analysis is carried out at gas processing facilities, LNG import and regasification terminals, custody transfer points and quality control laboratories. LPG analysis is carried out at import terminals, storage and blending facilities, distribution depots and quality control laboratories.

• How do I know which buyers guide is right for my application?

  If your laboratory tests LPG, propane, butane or related pressurised liquid hydrocarbon products, download the LPG guide. If your laboratory tests pipeline gas, natural gas or gas streams where calorific value and Wobbe Index are the primary outputs, download the natural gas guide. If you test both, both guides are relevant.