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Burst discs: Yes they burst when they shouldn't

Discussion in 'Tanks, Valves and Bands' started by 2airishuman, Jun 6, 2017.

  1. TrimixToo

    TrimixToo Regular of the Pub

    # of Dives: 200 - 499
    Location: New York State
    929
    950
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    For some reason, the Nuvair link did not work for me. But the end we're talking about looks like the DIN end of this adapter from LeisurePro:

    Aqua DIN to Yoke Tank Filler Adapter (A101)

    Everyone I know who own one has removed the nipple on the end so it can be used with 200 bar valves.
     
  2. Storker

    Storker Divemaster

    # of Dives: 100 - 199
    Location: close to a Hell which occasionally freezes over
    11,585
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    Since this thread was bumped, I re-read it and discovered another erroneous statement, so here goes:

    One like this, right?

    No, a 300 bar valve is too deep for the length of the plug.

    I can, but I don't need to. I already know that a 200/232 bar valve has five threads while a 300 bar valve has seven. As have the regulators.

    If you need a cite for that, look here. That's actually a pretty good article about the differences between yoke/A-clamp, 232 bar DIN and 300 bar DIN.
     
  3. KWS

    KWS ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: SE TEXAS
    4,041
    882
    113
    perhap-s i looked st some unique valves. the 300 has a slelf a portion of hte way bdown that he adapter insert will thread and seat against the shelf. there is a pit that goes further into the valve and if you put the yolk reg on and turned on the air it would vent to the atmosphere. other 300 valves have no shelf in the valve and the 200 bar reg can not thread far into the valve enough to block off the vent port. I dont have 300 bar valves so I dont know how many types there are but if you attempted to looses a 300 bar reg more than a turn the reg eill vent itself in the valve.
     
  4. Scott

    Scott Tech Instructor

    # of Dives: 2,500 - 4,999
    Location: Salt Lake City, Utah
    2,370
    710
    113
    The only time I have witnessed it happening underwater was a local instructor filled cylinders in his unheated shed during the winter to 3000 psi and then took it to a local spot where the water temperature was 90+. Could that of been the sole cause, who knows. Could of been a weak disc or a combination of the two.
    Luckily he was in about 5 feet of water when it let loose. Plenty of bubbles below and noisy when he surfaced.
     
    Fibonacci and Jay like this.
  5. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    524
    426
    63
    I must admit changing over burst discs was not on my service radar till I was overhauling a San-o-Sub tank valve and noticed how badly corroded it was!

    Ticking away just waiting to let go at the worst possible time :eek:

    Check that burst disk...
     
    Jay likes this.
  6. happy-diver

    happy-diver Skindiver ScubaBoard Sponsor

    # of Dives: 2,500 - 4,999
    Location: queensland Melbourne diver
    668
    366
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    Well I used to collect rubbings, remember when you would invite or were invited in, to view etchings.

    from the op shop

    full.jpg

    and I punch out burst discs to all my valves content
    sharing two with each, and everyones happy
    and sealing washers from milk bottles

    and the brass of the valve is the same no matter the bar

    using 90 duro yoke valve O rings means less blowouts.


    and imagine my consternation at having a tank O ring extrude
    through that tiny little slit that can't even be seen, but you know about water and air

    full.jpg


    So I had to get jiggy with it and reduce the size of the tanks sealing taper cone thing

    full.jpg
     
    Fibonacci likes this.
  7. rhwestfall

    rhwestfall Solo Diver

    # of Dives: 200 - 499
    Location: "La Grande Ile"
    11,727
    10,198
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    Modern burst discs (style in use for decades) are a trapped design.
     
    Jay likes this.
  8. rhwestfall

    rhwestfall Solo Diver

    # of Dives: 200 - 499
    Location: "La Grande Ile"
    11,727
    10,198
    113
    upload_2019-4-2_7-35-42.png
     
    Jay likes this.
  9. Shadow5868

    Shadow5868 Garibaldi

    # of Dives: 50 - 99
    Location: Sugarcreek Ohio
    3
    0
    1
    Is it possible for the first skit disk to rupture in a hot car when the tank is somewhat empty 500 pounds of pressure
     
  10. tbone1004

    tbone1004 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    15,379
    6,689
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    @Shadow5868 if it is already weakened, then yes. It would require an astronomical amount of heat to get the internal pressure up to near hydro pressure from 500psi
     

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