EffecTech’s Global Gas and LNG (GGLNG) proficiency testing scheme enjoys global participation from Natural Gas and LNG companies, providing an international scope for inter-laboratory comparisons.
A sample GGLNG report can be downloaded here:
For more information, please contact us.
Frequency and benefits
Up to four different gas mixtures are sent to the participating laboratories for analysis. The scheme is run on a quarterly basis (January, April, July and October) giving regular opportunities for participation.
The even and odd numbered rounds are as follows:
|Component||LNG composition (% mol/mol)||Propane composition (% mol/mol)||Mixed refrigerant (% mol/mol)||Sulphur component mixture (%μmol/mol)|
|ethane||0.1 – 14||0.25 – 3||20 – 35|
|propane||0.05 – 5||Balance||5 – 15|
|iso-butane||0.01 – 1||0.03 – 0.7|
|n-butane||0.01 – 1||0.03 – 0.7|
|iso-pentane||0.005 – 0.35||0.02 – 0.08|
|n-pentane||0.005 – 0.35||0.02 – 0.08|
|n-hexane||0.001 – 0.35|
|nitrogen||0.1 – 8||0.1 – 2||8 – 16|
|carbon dioxide||0.1 – 8|
|hydrogen sulphide||1 to 10|
|carbonyl sulphide||1 to 10|
|methyl mercaptan||1 to 10|
|ethyl mercaptan||1 to 10|
|dimethyl sulphide||1 to 10|
The LNG composition in Q2 and Q4 will not contain carbon dioxide and the nitrogen amount fraction range will be 0.1 – 1 (%mol/mol)
Please see the following table to find out which items are supplied in each round.
|sulphur component composition||N/A||✓||N/A||✓|
Mixtures 1 and 3 are supplied in 1 litre water capacity high pressure cylinders at approximately 30 bar. Mixtures 2 and 4 are supplied in 5 litre water capacity high pressure cylinders at 4 and 50 bar respectively.
Participants are required to report the composition and an estimate of the uncertainty and some physical properties of the gas where appropriate using the reporting template.
Evaluation will be using ISO 17043 approved methods including En ratio and Z scores.
As mandated by ISO 17043, all data including participants and performance will be kept strictly confidential. Only the submitting laboratory will receive feedback on their performance. Performance data will be reported to the whole group anonymously.