Text from the EURAMET prosject site:

This EMRP project brought together the expertise of scientists at 12 NMIs and four universities to make a significant reduction in the measurement uncertainty of transferred energy in liquefied natural gas (LNG) for trading purposes. This required improvements in the measurements for LNG quantity and calorific value. The project developed improved national capabilities and improved techniques for field measurements for: flow measurements, as a method to accurately assess LNG quantity; and composition and density in order to determine the LNG calorific value.  The project supported both traditional and innovative measurement methods by developing a metrological framework consisting of test and calibration standards together with the written standards and guidelines.

More info on the EURAMET LNG project site: