Flammable gas analysis for hot work on chemical process pipelines
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Dear marine friends, when working on hydrogen pipelines, what method is used for sampling and analyzing the gas inside the pipelines (the pipelines have been purged with nitrogen)?
For hydrogen in N2, chromatographic analysis is sufficient. It’s very convenient.
Simply use a combustible gas alarm; of course, it has to be explosion-proof.
Reply to 3# Egu Ting: I can hardly believe whether the combustible gas detector is good or not.
Increase the opening of the gas sampling valve and let more gas flow through before taking another measurement to ensure accurate readings; before use, the instrument can also be calibrated using a small amount of hydrogen.
The instrument can be calibrated using standard gases, and precise analysis can be achieved through chromatographic analysis
There are hydrogen explosion test bottles that can be used for testing; I saw them when I was at the electrochemical plant, and their accuracy is pretty good.
What was mentioned upstairs is probably a flamethrower; the tests for carbon monoxide and hydrogen yield reliable results.
Gas chromatography can be used for refinery gas analysis, but explosion detectors cannot; it’s a nitrogen-based medium
The portable testers imported are quite reliable, and the testing is fast. Chromatography is also a good option, and the analysis time for samples is short as well
With the use of explosion detectors, the sensitivity of modern combustible gas detectors is quite high; however, explosion detectors need to be calibrated before use.