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How much air does an LP85 hold at 2400 PSI?

Discussion in 'Tanks, Valves and Bands' started by CaveSloth, Sep 23, 2019.

  1. CptTightPants21

    CptTightPants21 Solo Diver

    # of Dives: 200 - 499
    Location: NY/NC/FL
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    I think people on this board know I am a firm believer in fundamentals and fundamental knowledge, but tank markings gets covered in OW, but rarely is it fully enforced/emphasized. It takes reinforcement to truly master the concept and that reinforcement usually doesn't come until AOW, Nitrox, Intro to Tech. I think cooler heads have done well in the thread and let's keep it going.


    CaveSloth--basically, an LP tank is only "full" at 2640. There is no danger to filling your tank up to 2640, but if you get a gas filler with a stick up his A55 and he only fills the tank to 2400, you will have less than 85cuft

    Water volume is internal volume, not external.
     
  2. CaveSloth

    CaveSloth Manta Ray

    # of Dives: 50 - 99
    Location: The Deep South
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    The tank length from the rounded bottom on the floor up to the end of the tank, before the chrome valve starts is:

    26.5"

    Measured twice with 2 different tape measures.
     
  3. Storker

    Storker ScubaBoard Supporter ScubaBoard Supporter

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    No. It's the internal volume, how much water you can put into the tank.
     
    CaveSloth likes this.
  4. CaveSloth

    CaveSloth Manta Ray

    # of Dives: 50 - 99
    Location: The Deep South
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    @tursiops any clue as to the 26.5" length of these tanks?
     
  5. flymolo

    flymolo DIR Practitioner

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    This is a great thread
     
    Cowfish Aesthetic likes this.
  6. tursiops

    tursiops Marine Scientist and Master Instructor ScubaBoard Supporter

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    upload_2019-9-23_14-29-17.png

    This is a listing of current Faber tanks, from Blue Steel. Older listings show the same highlighted tank but with a different item number.

    If you want to know for sure, you'd take the valve off, fill the tank with water, and measure how much water is in it. I do NOT recommend you do this....
     
    CaveSloth likes this.
  7. CaveSloth

    CaveSloth Manta Ray

    # of Dives: 50 - 99
    Location: The Deep South
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    Thanks for being decent to me @tursiops

    So, no info on a 26.5 length tank or I am measuring the length incorrectly. Anyway, that is close so I will use it for my calculations.
     
  8. kelemvor

    kelemvor Big Fleshy Monster ScubaBoard Supporter

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    I have to agree. The calculation is as simple as a calculation can be. Tank factors add a useless complication.
     
  9. flymolo

    flymolo DIR Practitioner

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    I'm actually confused by this. Isn't the calculation you cited the exact same one that's used to determine "tank factor"?
     
  10. Bob DBF

    Bob DBF Solo Diver

    # of Dives: I just don't log dives
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    The stamped rating of the tank is known as the tank's service pressure. During hydro the tank can be tested to see if the +rating can be stamped, allowing fills that are 10% higher than the service pressure. Some hydro shops never test for the + rating, so it's a good thing to ask about before having a hydro done.
     
    dead dog likes this.

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