I know it is edited and I saw an opportunity to poke fun and..... Mr Fe Wood is from a place called Grass Valley in Northern California so I could not help it.
The test method I mentioned is a good one to double check that no oxygen is in a vessel, AFTER it has been purged a while, NOT to check to see if flammables are in it, in the first place, but as Mr MacBruce stated in post #9 not a recipe for disaster.
smith out
P.S.
Sorry if I offended anyone in the spirit of fun.