Analysis of biomethane, CNG, LNG and LBG quality

Gas fuels including biogas fuel is one of the accepted Alternative Fuel Sources in the world today because of its valuable benefits and advantages over petroleum fossil fuels. Sweden is a world leader in upgrading and use of biomethane for transport. In order to maintain a positive development of this sector, several conditions must be fulfilled at the same time, among them, minimized disturbances for clients. One of the main problems causing disturbances is the quality of the gas. The primary types of contamination are oil carryover from the compressor system, moisture and other impurities as siloxanes, sulfur compounds (for biomethane).

SP Technical Research Institute of Sweden has through research projects developed methods for the sampling and analysis of compounds under discussion for regulations or already regulated by the Swedish standard SS 15 54 38 and European standard. With access to many different instruments of analyses, we can offer gas analyses, all after requirement. Quality assurance of our analyses is obtained by mean of certified gas mixtures in tubes.

Example of analyses we can offer:
Methane, carbon dioxide, oxygen, nitrogen, (hydrogen and carbon monoxide) according to ISO6974 and calculation of physical properties (density, wobbe-index..) according to ISO6976. (in sampling bags)
Hydrogen sulphide (detection limit: 1 ppm-vol) (in sampling bags), methyl mercaptan
Water (detection limit: 5 ppm-vol) (in cylinder)
Ammonia (detection limit: 2 ppm-vol) (required specific sampling) (in cylinder)
Siloxanes (individual and total siloxanes reported in µg Si/m3), on adsorbent tubes
Other VOCs (terpenes, other sulphur compounds excl. H2S and methyl mercaptan, nitrogen containing compounds excl. NH3)
Oil carryover (detection limit: 2 ppmM)


Other analyses
LNG (liquefied natural gas) is a mixture of low-molecular-weight hydrocarbons with
nitrogen as a principal inert impurity and methane as major component. LBG (Liquefied Bio Gas) is basically the same as liquefied natural gas but is produced from biogas. The introduction of liquefied gas is an important measure in terms of achieving Sweden’s objective of a reduced environmental impact from road traffic. To determine the composition of LNG/LBG, it is essential to calculate its properties such as calorific value, density and methane number. It is also important to optimize the operations of LNG/LCNG refuelling stations so as the product delivered fulfills the requirements set to ensure a proper functioning of the LNG-trucks.


Example of analyses we can offer:
LNG/LBG quality determination (with regard to methane, ethane, propane, butane, isobutane, C5, C6, oxygen, nitrogen, hydrogen, carbon dioxide and carbon monoxide)
Calculation of methane index and LNG/LBG density from the composition

RISE Research Institutes of Sweden, Phone 010-516 50 00, E-mail

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