Last Post 08 Apr 2014 04:40 PM by  RICHARD TRANTHAM
Air without Compressor
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James Peace
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03 Apr 2014 06:36 AM
    I find myself in shallow water quite a bit with my 2" dredge and use my standard old snorkel to float on the top and stay in the water. Is there any way to extend snorkel to go a little deeper? A couple of feet maybe? I thought about a pvc pipe that the snorkel attaches to, use the 3-4" pvc and an innertube to float it straight up and down, and adjust the depth to the snorkel with the pipe in the innertube and a sock on top of the tube to keep bugs, leaves, trash out... any ideas or is this too dangerous?
    PAUL VENKER
    Greenhorn
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    03 Apr 2014 09:32 AM

    Not a good idea if you want to live. After a while you will be breathing exhaled air which is not oxygen. I cannot remember the correct word/names for it. 

     

    Paul 

    James Peace
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    03 Apr 2014 09:34 AM
    Ya I was thinking it wouldn't refresh the oxygen and get too much carbon monoxide in the pipe, however if exhaling underwater then....
    William Hall
    Buzzard
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    Posts:648



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    03 Apr 2014 04:05 PM

    Your lungs are not capable of pulling the air down past about 13" or so.

    Have tried this and it didn't work, as have others.

    It just doesn't work. A compressor is needed to build enough pressure to push it down to ya.

    The deeper you go the more pressure you need.

     

    Good Luck.

     

         OC

    James Peace
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    03 Apr 2014 04:36 PM
    Ya I figured. Thanks! just thought to ask. lol
    Chris Murray
    Greenhorn
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    03 Apr 2014 05:56 PM

    You can extend the draw pipe a couple of feet but if your inhaling and exhaling through the same pipe, youll have the usual 21% oxygen present on the inhale but only 2ish% oxygen on the exhale & the following breath.  You can get over this by exhaling through a vented mask but depending on conditions and the quality of your anti fog, you will most likely be fogging over in short order.  

     

    If its just 2', I say just use the snorkel / breath hold / purge method.  Beyond that move to a surface supply or sling a bottle like a 30cf pony tank.

     

     

    RICHARD TRANTHAM
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    08 Apr 2014 04:40 PM

    You could only do it by incorporating at least 2 one way valves. Kinda like a foot valve.One to let air in the snorkel and one for exhale. It could probably be done and cheaply but would require some engineering.

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