Project summary

Summary of the JRP

Background
Liquefied Natural Gas (LNG) is a strategic, and in the case of long distances, a more economical alternative for pipeline gas. It is also used to transport natural gas from and to locations where no pipeline infrastructure exists. After regasification of the liquid form, the natural gas is transported to the main users: power plants, industry and households. Recently the use of LNG as a cleaner transport fuel has been added to the list of important applications.

Need for the project
In comparison with other commodities like natural gas or gasoline the total uncertainty of measured energy is high for LNG and has been estimated to be up to 1 %. The current lack of direct traceability to the SI also leads to the delayed introduction of new measurement methods in the LNG business. Therefore, a sound metrological framework is an indispensable element for the development of LNG as transport fuel, which is one of the pillars of the EU clean fuel strategy.

Scientific and technical objectives
The aims of the JRP are to further develop the metrological framework for LNG, to contribute to a reduction of the measurement uncertainty of LNG custody transfer by a factor two (starting from 1 %) and to enable the development of LNG as a clean transport fuel.

Therefore, the JRP addresses the following objectives;

WP1
will develop and validate novel and traceable calibration standards of LNG mass and volume flow for vehicle fuel dispensing and ship bunkering. A mid-scale LNG mass and volume flow facility up to 200 m3/h (90 tons/h) will be built and validated. This standard will be traceable to the previously developed primary flow standard. It will furthermore be cross-validated using a new Laser Doppler Velocimetry (LDV) based standard. From the results a new ISO standard will be drafted (as part of WP5) to pave the way for industry wide adoption of the LNG flow measurement technology.

WP2
will develop and validate novel and improved methods for measuring LNG composition to address the online monitoring of the LNG quality and issues with sampling LNG. A LNG composition calibration system will be developed and integrated into the LNG flow facility. It will be cross-validated with a newly developed reference LNG liquefaction system. The latter will also be specially designed to validate Raman spectroscopy systems.

WP3
will develop a publicly available method for the determination of the methane number, including a correlation of the methane number to the LNG composition, in support of the use of LNG as transport fuel. From the results a draft ISO standard will be created (as part of WP5) to harmonise the definition and measurement methods used by gas engine manufacturers worldwide.

WP4
will validate and improve models for LNG density prediction and associated uncertainty evaluation. A new set of measurement data will be created with an uncertainty 5 times lower than existing data and an improved correlation between density and composition will be established. A cryogenic Speed of Sound (SoS) measurement system will also be developed to establish an improved correlation between SoS and density.

WP5
is designed to maximise the impact for the JRP, by disseminating the results and by strengthening links to industrial stakeholders.

WP6
describes the management of the JRP. The selected methods will ensure an effective and efficient project management.