hi guys, just sent 4 bottles off for testing and during inspection the tester found green residue inside 2 of them which seems to be hardened a bit to the inside walls of the aluminium? they've never come accross it before and i must admit neither have i (hoping it might just be paint) has anyone else found anything like this whilst sending their bottles for test in the past and shed a bit of light on this please. cheers guys
wont test it because it's in there and they cant shot blast aluminium. theyre gonna try and clean it out but if it wont come off it fails before they even test it! they said everything else is fine but they've never come across this before and neither have i frankly! especialy to find it in 2 bottles
1 pure energy and 1 evil bottle and its a company not far from me called remars. been testing bottles for us for years and far longer for our old boys. i emailed hpac to see wether they've come across this before, just waiting for a reply
Sounds to me like it has had some moisture in there. When they were stored, was there some residue pressure in the tanks?
nope, both completely sealed from facory units. and stored empty for past few months. spoke with my resident guru who thinks it may be down to someone using a compressor without the filters on it, but not 100%. will be hearing back from the guy testing them tomorrow after he's attempted to clean them.
Always always keep some pressure in your bottles unless you need to do something like swap/service your regs. Otherwise moisture can get in and corrode your bottles from the inside out.
seriously??? mould??? not really buying that concept from what the guy testing it has advised me but hey, i could be wrong. from what we've discussed the word "residue" has been reiterated to me several times and in fairness the regs have been off for a week before sending and have been kept in a dry room temperature condition the entire time. oh well, time will tell
Going back to my aircraft engineering days, all nitrogen bottles were supplied with a lock charge of "dry" nitrogen at about 50psi to prevent the ingress of impurities and moisture and we only released that charge immediately before fitting the bottle. I try to keep my bottles charged at all times, but of course I can't be sure that the compressed air supplied by the site is as dry as possible. I've seen corrosion in bottles before, but usually steel ones, Usually corroded aluminium would give a white powder and copper a green residue, so it could be a mould mixed with aluminium corrosion.
right, so just had a message back from the guys testing and one bottle passed. the other failed as apparently the yet to be named substance had apparently started to eat away at the inside wall of the aluminium well lets just say, there are reasons for getting them tested and this is a perfect example!
