Facts on LNG
LNG typically contains more than 90% methane (CH4). It also contains small amounts of ethane, propane, butane and some heavier alkanes. It is predominantly methane that is converted temporarily to liquid form.
Depending on temperature, pressure and composition, the density of LNG is typically in the range 0.41 to 0.5 kg/l compared to water with a density of approximately 1.0 kg/l.
The detailed specification of LNG varies for the different locations from where the LNG is shipped from. The gas converted to LNG is typically richer on heavy components compared to traditional European pipeline gas, why the heating value of gas from LNG typically is higher compared to traditional European pipeline gas.
In 2008 pipeline gas accounted for 588 bcm or 72% of the world gas trade while LNG accounted for 227 bcm or 28% (Source: BP Statistical Review of World Energy, June 2009).