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Cave Fills on LP tanks

Discussion in 'Technical Diving' started by ScubaFeenD, Oct 15, 2010.

  1. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, Washington State
    11,154
    5,892
    I had a 3AL2015 (that's an aluminum medical O2 bottle) come back from hydro with 22% permanent expansion once. It had never been overfilled but needless to say it was a fail lol I was a little shocked I couldn't see the bulge.

    3AA2400+ steels filled to 3600psi might fail "sooner" than those only filled to 2640psi. Its still likely to be longer than anyone is actually diving and they are far more likely to fail visual due to interior rust pits than they are to fail hydro. 3AA steels are so insanely overbuilt that I have seen some O2 supply bottles from my gas supplier dating from before WW2. They far predate USDOT (they have ICC numbers). So if a non-overfilled 3AA can last 80+ years in service so what if an overfilled 3AA "only" lasts 40yrs.
     
  2. BRT

    BRT not a soft touch

    16,195
    13,976
    I have seen them from the WW1 era. A friend of mine owned one. It failed hydro for rust, not for expansion.
     
    rjack321 likes this.
  3. jerrwhy01

    jerrwhy01 Registered

    49
    43

    Whew!
     
  4. Scuba_Aaron

    Scuba_Aaron Solo Diver

    # of Dives: 200 - 499
    Location: Des Moines Iowa
    82
    19
    I overfill my LP50's and 85's to 3000 regularly with my own compressor, damn the torpedoes, full steam ahead!!!!!
     
  5. Superlyte27

    Superlyte27 Cave Instructor

    # of Dives: 5,000 - ∞
    Location: Florida
    4,156
    3,314
    That's weak :)
     
  6. Scuba_Aaron

    Scuba_Aaron Solo Diver

    # of Dives: 200 - 499
    Location: Des Moines Iowa
    82
    19
    Weak? care to explain?
     
  7. lv2dive

    lv2dive Formerly known as KatePNAtl

    # of Dives: I'm a Fish!
    Location: Lake City, FL
    2,795
    2,085
    LP tanks are routinely filled to 3600-4000 in cave country. I imagine that was what SL was referencing.

     
    Michael Guerrero and kelemvor like this.
  8. Superlyte27

    Superlyte27 Cave Instructor

    # of Dives: 5,000 - ∞
    Location: Florida
    4,156
    3,314
    Thanks Kate. Exactly.
     
  9. JBFG

    JBFG Contributor

    # of Dives: I just don't log dives
    Location: Ottawa, Canada
    1,254
    675
    4000 psi on a LP?!? The garage is definitely exploding tonight.
     
  10. Storker

    Storker ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 100 - 199
    Location: close to a Hell which occasionally freezes over
    17,157
    13,557
    It's only 150% of service pressure, i.e. the same as hydro test pressure here on the right side of the pond...
     

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