Air without Compressor
Last Post 08 Apr 2014 04:40 PM by RICHARD TRANTHAM. 6 Replies.
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JAMES PEACEUser is Offline
Dredger
Dredger
Posts:98



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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 VENKERUser is Offline
    Greenhorn
    Greenhorn
    Posts:1



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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 PEACEUser is Offline
    Dredger
    Dredger
    Posts:98



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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 HALLUser is Offline
    Lost Dutchman
    Lost Dutchman
    Posts:373



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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

    So much river....So little time....Get out there
    JAMES PEACEUser is Offline
    Dredger
    Dredger
    Posts:98



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    03 Apr 2014 04:36 PM
    Ya I figured. Thanks! just thought to ask. lol
    CHRIS MURRAYUser is Offline
    Greenhorn
    Greenhorn
    Posts:19



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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 TRANTHAMUser is Offline
    Greenhorn
    Greenhorn
    Posts:7



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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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