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Difference between tank vis ?

Discussion in 'General Scuba Equipment Discussions' started by JackOfDiamonds, Aug 5, 2019.

  1. JackOfDiamonds

    JackOfDiamonds ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Israel
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    Hello ,

    I've recently had my scuba tank (12L/AL80) visually inspected and encountered something frustrating that I would like to know more about .

    I had my tank inspected under "IANTD" standards which as far as I'm aware are pretty strict.
    The same DC I had the tank inspected had no problem filling my tank with any nitrox mix , along with all the clubs that operate under "IANTD".

    When i went to a different DC to have my tank filled with nitrox they refused to refill my tank with anything but air.
    They claimed it's because they operate under a different standard, "ANDI - Safe Air " .

    I was baffled because they had no problem refilling my tank with air but they refused to fill any mix above 21%.

    I'm genuinely curious , is there a difference or a reason why would they do this ? Or is this just another case of pointless bureaucracy?

    Would appreciate any insights .
     
  2. tbone1004

    tbone1004 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
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    7,067
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    stupid dive shops having their own rules. There is no requirement for VIP so they can basically make whatever rules up they want
     
    Fishyhead likes this.
  3. guruboy

    guruboy Divemaster ScubaBoard Supporter

    4,732
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    A visual inspection does not include O2 cleaning.
     
  4. TrimixToo

    TrimixToo Regular of the Pub

    # of Dives: 200 - 499
    Location: New York State
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    To expand a bit on the above, perhaps Shop A does continuous blending, and Shop B does partial pressure blending. Perhaps Shop A did not punch out the "O2 clean" mark on the inspection sticker (for which there might be more than one reason). If these postulates happen to be true, Shop B is being responsible to themselves, and to you. If one is not true, then a bit more investigation might be in order before being annoyed with Shop B.

    Just my 2 PSI.
     
    Diesel_Diver, Bob DBF and JackD342 like this.
  5. oly5050user

    oly5050user Dive Travel Professional

    # of Dives: 5,000 - ∞
    Location: Westchester NY
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    When I worked at a ANDI facility , to create a nitrox fill they used 50% O2 rather than 100% to create the partial pressure mix. Tanks need to be O2 cleaned , Ed Betts was owner of ANDI at the time and custom made the fill panel used.
     
  6. JackOfDiamonds

    JackOfDiamonds ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Israel
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    Under IANTD it does include O2 cleaning , my tank even has the sticker attached to it indicating its safe for O2 use.
     
  7. TrimixToo

    TrimixToo Regular of the Pub

    # of Dives: 200 - 499
    Location: New York State
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    I think this is a difference in intended semantics.

    Some VIP *classes* include O2 cleaning training.

    No VIP *inspection* I am aware of includes O2 cleaning as a matter of course.
     
    Hoyden likes this.
  8. JackOfDiamonds

    JackOfDiamonds ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Israel
    340
    214
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    I think i lost you there, my English could probably use some honing .

    the VIP Inspection i have done does including O2 cleaning as part of IANTD (International association for Nitrox & Technical Divers ) does require O2 cleaning for tanks as indicated on my tank's sticker. (Would take a picture but im not home atm)

    I didint take any class what so ever, just wanted to have my tank inspected and later filled at a different DC.

    Apologize in advance if i misunderstood you
     
  9. Diesel_Diver

    Diesel_Diver Nassau Grouper

    # of Dives: 100 - 199
    Location: Bay of Fundy region
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    Perhaps it was not a tank issue, did you present a card to the filling station thy said you were qualified to use mixes over 21% ? Just a thought. My local shops never check mine because they KNOW me, when I travel it’s a different situation. Just a thought!
     
  10. W W Meixner

    W W Meixner Rebreather Pilot

    # of Dives: 500 - 999
    Location: Ontario Canada
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    JD...

    I'd like to see the VIP sticker on your cylinder...

    There is O2 cleaned for max 40% service...there is also 100% oxygen service cleaned...for either 100% oxygen service...and partial pressure fill service where 100% oxygen is introduced into the cylinder first...before it is topped up with 21 % (air)...

    A cylinder that is cleaned for 40% oxygen service...cannot be filled by the partial pressure fill method...

    Then there is the ''blend stick'' pre-mix fill method to 40% max...where the cylinder does not have to be oxygen service cleaned at all...

    The best way to be sure is to always have your cylinders/valves cleaned for 100% oxygen service...and ensure the shop you use is always using hyperfiltered air...if not the cylinder will have to be recleaned...

    Personally...I'm not a believer in a cylinder cleaned for max 40%...in my mind the cylinder/valve is either cleaned for 100% oxygen service...or it's not...

    I've seen shops that claim to be performing 100% O2 cleaning on the cylinders...but leave the valves untouched...

    The attached is the VIP sticker I use...with the appropriate punch-outs for 100% oxygen service cleaned...

    This yellow/green VIP sticker also eliminates the need for large NITROX bands...

    Hope this helps...

    Best...

    Warren

    NITROX VIP Sticker.jpg
     
    Dark Wolf and JackOfDiamonds like this.

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