Click here to go back to the previous page


2024 Proficiency Test (PT) on Refinery Gas started


The letter of instructions can be downloaded here as a pdf document. To download a document, please click the right mouse button and choose the "save as" option.


Please download the instructions for the PT iis24S01R here: the letter of instructions and the report form here


Summary of this proficiency test:


On 24 January 2024 the proficiency test on Refinery Gas started with 29 participants from 15 different countries. On that date, the samples were dispatched to the laboratories. Enclosed to the sample is the material safety data sheet (MSDS).

Please confirm sample receipt as soon as you have received and checked the contents of the sample package via Please enter the date of receipt and press the "save date" button.


The samples can be analyzed on: Hydrogen, Argon, Oxygen, Nitrogen, Carbon Monoxide, Carbon Dioxide, Hydrogen Sulfide, Methane, Ethane, Ethene, Ethyne/Acetylene, Propane, Propene, Propyne, Propadiene, iso-Butane, n-Butane, Trans-2-Butene, 1-Butene, 2-Methyl-Propene, Cis-2-Butene, 1,3-Butadiene, iso-Pentane, n-Pentane,Other components with 5 or more carbon atoms, excluding iso-and n-Pentane (C5+), Carbon content and Lower Calorific Value. 


The deadline for reporting results is set on 1 March 2024. A laboratory that reports test results after the deadline will definitely not get direct feedback in case any of its results are suspect! So be in good time to get the most out of this proficiency test.

The test results should be reported via our internet based results reporting platform A login and a password can be requested via email to





©1996-2023 Institute for Interlaboratory Studies