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Thread: few dive bottle questions

  1. #1
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    Default few dive bottle questions

    1. A 10L bottle = how many cube foot capacity?

    2. if filled up a 10L bottle to 230bar. how many liters normal air have been compressed in the bottle?

    3. will u considering buy a carbon fiber bottle? how much will u prepare to spend on it and with what capacity/pressure?
    <span class='smallblacktext'>[ Edited ]</span>

  2. #2
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    I may be wrong but my gues would be:

    1.) 10 liter = 0.353 146 666 cubic foot

    2.) PV=nRT

    n=93.09 mole
    Since one mole of dry gas at STP occupies 22.4 liters
    = 93.09 x 22.4
    = 2085.21 liter

    3.) ?
    !amazed

  3. #3
    Marksman
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    10L at 1bar or atmospheric pressure = 10L

    10L X 230 bar = 2300L air ...very simple

  4. #4
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    re carbon fibre bottles...

    are they common in za? do they go through the the same testing procedures as steel/alu bottles? do dive shops fill them up as normal.....and what's the life span like?

  5. #5
    Marksman
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    You cannot test carbon cylinders the same way...

    They are actually thin alu cylnders with a carbon outer sheath...when used for diving water can infiltrate between the 2 layers causing problems.
    Best used by firefighters since these cylinder are really light weight...otherwise forget about them in this country

  6. #6
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    inside of the carbon fibre bottle is aluminum liner to hold the air. with carbon fiber over wrap aluminum liner for abrasion resistance. normally come with size like 3.0L/4.7L/6.8L/9.0L. working pressure 330bar. 6.8L one only weights 3.7kgs. carbon fibre bottle is 50% more strange than steel bottel and can not explode. required test every 5years in europe. every 3 years in USA.

    The U.S. Navy use both fiberglass cylinders and carbon fiber cylinders


  7. #7
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    Hi all.

    While we are on the subject of bottles, my bud got himself a new 300 bar bottle but just to check if the plug that screws into the nozzle of the bottle actually works he opened it a bit to see if any air escaped. Now he has pressure behind the plug. How does he get rid of that pressure behind the plug without making a bullet out of it, because I am not going to screw it off for him?

  8. #8
    Marksman
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    unscrew it very very slowly...it wont shoot off

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