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LDS Won't + 10% Fill Plus Rated Tank?

Discussion in 'Tanks, Valves and Bands' started by Dubious, Jul 10, 2020.

  1. stepfen

    stepfen ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Greece
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    Do they really change pressure depending the tank rating in Italy Angelo??

    Wherever else I have seen (here in Greece, Indonesia, Egypt, Jordan), they fill to 200bar. They have an automatic pressure switch that turns off the compressor at the set pressure and actually since most do hot fills (directly from the compressor) they set it to ~220bar hot which goes down to around 200bar once the tank cools down. Interestingly they do that (220bars hot) even for lower rated tanks like the standard 11.1lt/207bar aluminum tanks (but that's another story).

    Most won't bother to do anything else than that. Very few bother to do 300bar if requested (they have to bypass the automatic switch). I haven't seen anybody bothering to do anything in between (eg 232bar let alone 207bar).

    To me these things should be simple. Drop your tank to the fill station and expect to get it back with 200 usable bars of gas. Do you want more gas (for whatever reason)? Get a bigger tank.

    I've seen so many HOT discussions here in SB about + or no + signs, lost + signs, tank of 80cuft or 81cuft or 79.6456654872cuft, 3000 or 3512 or 3125.365psi, HP LP etc, cave fills or whatever else... OMG...

    I am out of here before the storm hits me too.
     
    tridacna likes this.
  2. halocline

    halocline Solo Diver

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    Comparing a scuba tank at 10% overfill to a stick of dynamite is, no offense, ridiculous. Unless you are talking about sticks of dynamite that have never once in history been known to explode, because that is the record of steel tanks filled to 10% overfill. Please find a single example of one steel tank exploding due to being filled to the plus rating legal limit with air (not 100%O2, which is a different issue) and injuring a dive shop employee.

    I understand that you personally would rather not take that risk, and certainly it's your business. But characterizing as a actual, real-world risk is completely inaccurate.
     
    Bob DBF, Boiler_81, Luis H and 2 others like this.
  3. Kharon

    Kharon Solo Diver

    # of Dives: 200 - 499
    Location: Upstate NY
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    Just plain wrong. Bye
     
  4. Angelo Farina

    Angelo Farina Marine Scientist

    # of Dives: 1,000 - 2,499
    Location: Parma, ITALY
    1,263
    1,884
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    Well, historically this was the standard until a few years ago.
    Nowadays most shops only fill their own tanks, and most divers do not own personal tanks anymore, so if the shop has 232-bars tanks (which now are the most common) they set the compressor limiter accordingly.
    I agree that getting higher pressures (250 or 300 bars) is very difficult also here...
     
  5. Miyaru

    Miyaru Tec Instructor ScubaBoard Sponsor

    # of Dives: 2,500 - 4,999
    Location: EU
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    This topic is great. In the metric world (= Earth minus 3 countries) bar is used for pressure. Two indications on the tank, e.g.:
    PW 300bar - this one is for the diver / tankmonkey, the working pressure
    PT 450bar - this one is for the hydro guys: test pressure

    Since the US indeed helped winning the war in the previous century, we remember that by calling an AL80 still an AL80. Apart from that, every diver uses 11.1 liters when calculating total gas volumes.
    Tanks currently in use are 232bar or 300bar, sometimes 200bar tanks pop up.
    Sizes are 7, 10, 12, 15 and 18 liters.
    Banked tanks are 50 or 80 liters and usually 300bar. All tanks have PT and PW stamped into the neck, never any discussion necessary.

    Hydro validity depends on the laws per country.
     
  6. BRT

    BRT not a soft touch ScubaBoard Supporter

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    I don't have worldwide experience. But I think that Mexico usually uses PSI and names their tanks by capacity.
     

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