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  1. #11
    Established TDF Member Paulo's Avatar
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    Quote Originally Posted by Tewdric View Post
    Any evidence for that statement? A reference would be useful.
    To which part?
    Remember anything you read on the internet was probably written by some guy sitting at home in his underpants! Including this !!

    Illegitimi non carborundum

  2. #12
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    Sorry I fluffed the quote - now corrected. You're quick

  3. #13
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    Quote Originally Posted by Paulo View Post
    Lads in my local BOC and Air Products places have told me the only difference is that they purge the medical / diving stuff every time and that it comes with a papertrail. BOC diving o2 was 99.5% when I checked the data sheets and the industrial was 99.95 so was actually "purer" but I suspect that the difference was that they were only willing to stand over 99.5 for diving / medical.

    BTW diving / medical are the same just diving is a higher pressure, if you didnt know
    So diving grade is continually quality assured as suitable for pumping to super high scuba tank pressure and the rest is probably the same, but without the additional procedural steps there's no way of knowing for sure?

  4. #14
    Established TDF Member nigel hewitt's Avatar
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    Good, consistent welds are important to a business.
    That demands reliable gasses.
    None of this 'breathing' rubbish.
    Helium, because I'm worth it.
    Waterboarding at Guantanamo Bay sounded like a radical holiday opportunity until I looked it up.

  5. #15
    Established TDF Member Paulo's Avatar
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    The grumpier of the 2 in my local BOC is always very quick to point out that they do not condone decanting O2. I always ask him what sort of dive to 6m does he think I am doing with his 90kg cylinder
    Remember anything you read on the internet was probably written by some guy sitting at home in his underpants! Including this !!

    Illegitimi non carborundum

  6. #16
    TDF Member germie's Avatar
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    I have used the industrial helium and oxygen several times. No problems.
    The biggest difference is not the purity, but that the 50L cylinders where you get it in are not cleaned for they fill them again. So that means that someone could have drained it totally or made impurities in it. With dive oxygen the cylinders are cleaned before you get them. This is what is told to me.

  7. #17
    Established TDF Member nigel hewitt's Avatar
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    Quote Originally Posted by germie View Post
    I have used the industrial helium and oxygen several times. No problems.
    The biggest difference is not the purity, but that the 50L cylinders where you get it in are not cleaned for they fill them again. So that means that someone could have drained it totally or made impurities in it. With dive oxygen the cylinders are cleaned before you get them. This is what is told to me.
    So the 99.99% pure certificate is a lie?
    I really doubt that.
    Helium, because I'm worth it.
    Waterboarding at Guantanamo Bay sounded like a radical holiday opportunity until I looked it up.

  8. #18
    TDF Member germie's Avatar
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    This is what is told to me. I have never asked it at Air Products themselves or Messer. But I have used industrial oxygen and 4.5 Helium instead of 5.0.

  9. #19
    Established TDF Member Energy58's Avatar
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    Quote Originally Posted by nigel hewitt View Post
    So the 99.99% pure certificate is a lie?
    I really doubt that.
    Welding gas has to be pretty pure. 99.99% pure is presumably 99.995%+ pure in their tank and the rest is the 1 bar of God knows what left in the cylinder when it is vented to atmosphere. I breathe stuff a lot less pure than that!

  10. #20
    Where'd The Bubbles Go ....? Capt Morgan's Avatar
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    I use welding O2 for all my fills and it's been fine, I always analyse it before use
    and I'm happy with the results so far.
    I use diving grade helium but I have access to "Balloon Gas" when analysed it was
    as pure as diving grade but I have never used it, has anyone? It would be interesting
    to know just what the difference is.
    Last edited by Capt Morgan; 07-11-2016 at 11:10 AM.


 
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