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how long does a scuba tank last for?

Discussion in 'Tanks, Valves and Bands' started by evilbacon, Mar 1, 2006.

  1. evilbacon

    evilbacon Angel Fish

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    Im a under water hull cleaner, and instead of hawling around the big compressor I would just like to carry a tank with me. It is a big scuba tank by the way. The hull cleaning takes about 3-4 hours with about 15 minutes under water for each boat max. So is this a good idea or should I just stick with the compressor? Im not a heavy breather and I don't kick alot when im cleaning, so should that have any effect with how long the tank will last me?? please help..:05:
     
  2. Rick Murchison

    Rick Murchison Trusty Shellback Staff Member ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Gulf of Mexico
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    Next time take both. If the tank runs dry, use the compressor. If it doesn't, leave the compressor at home after that.
    Rick
     
  3. Chad Carney

    Chad Carney Dive Equipment Manufacturer

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    A lot of hull cleaners roll a hand truck around with two 80 aluminum tanks strapped to it, and use a long hose breathing system. Pretty tough to beat for economy and portability.

    I clean my own boat, on scuba in winter and just freediving the rest of the year. Your breathing rate can be excellerated with heavy arm work too.

    Chad
     
  4. Walter

    Walter Instructor, Scuba

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    With proper care, a tank will last for decades. I have a couple over 50 years old.

    You should be able to clean several on one air fill.
     
  5. Packhorse

    Packhorse Solo Diver

    # of Dives: 500 - 999
    Location: 20 meters below Auckland New Zealand
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    Assuming you are only going down to 2 meters or so and using a 15 litre tank (123 cubic foot) and a Surface Consumption Rate of about 20 litres a minute (quite high)
    15 (litre) x 232 bar (tank pressure) / 20 (SCR) / 1.2 (at a depth of 2 meters. use 1.5 for a depth of 5 meters)= 145 minutes. This will of course leave you with no air at all in the tank. So change the 232 to 200 and come up on 32 bar and you get 125 minutes.
     
  6. evilbacon

    evilbacon Angel Fish

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    huh? sorry, im not good with numbers.....
     
  7. H2Andy

    H2Andy Blue Whale

    # of Dives: 200 - 499
    Location: NE Florida
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    depends on your consumption rate and depth

    at less than 20 feet, with a normal breathing rate, you can expect an
    AL 80 tank to last you at least 90 minutes

    a larger tank (say 100 cubic feet) should last you a minimum of 115 minutes.

    an even larger tank (say 120 cubic feet) should last about 140 minutes

    (these are all rough, minimal estimates)
     

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