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Thread: pony bottle as inflation source

  1. #1
    Grouper
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    pony bottle as inflation source

    weird title but I didn't know how else to word it

    recently changed my drysuit inflation hose from my back tank to slung pony bottle that also has a spare reg on it. seems to work ok but what do you think? good idea or bad? how much psi will any average dive us from a 19 cf bottle?
    My gear my life I will check my gear every time

  2. #2
    I know a few guys who use a separate bottle for drysuit inflation. Most are using a 19 cu.ft. bottle. You can also fill the bottle with argon (not breatheable). I believe it has better thermal properties than air. The downside is (a) you have to be careful to not confuse it with air and (b) you cannot use it as a bail-out bottle in an emergency.
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  3. #3
    Grouper
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    I guess I should also say that there is no intention to hand this bottle off to another diver as there is no other diver (solo)
    My gear my life I will check my gear every time

  4. #4
    Barracuda
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    I still use my back gas as primary source for the suit. I do have an inflator hose on my 50% bottle in case I had to shut down my right post on the back tanks. Argon in a seperate 6-19 CF bottle is ideal when you add helium to the breathing mix, helium is a crap insulating gas. If the 19 is your redundant breathing gas, I would stick to keeping it that way. That way when you need it, you know it is all still there waiting for you
    any puddle...anytime...anyplace!

  5. #5
    Megalodon
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    IMHO, if you're using a bottle for dry suit inflation, it should be a single task set up - don't rely on it for escape gas. Argon filled bottle is one reason (though, personally, I haven't bought into the argon is warmer argument.)

    The other is how much gas are you using to inflate your dry suit? I would imagine it would be in the neighborhood of 2-3 cuft depending on the depth of your dive. How many dives have you had on that pony without a fill? how much was left in it when you are planning on using it as a bailout bottle? Most places charge the same for a 400 psi 19 cu ft top off as a full fill on an AL80. Personally, I'm of a mind to have my redundant gas stay redundant only and my inflation gas stay inflation only and don't cross purpose them. Also, as I recall, most argon systems are 6 cu ft tanks.

    I once saved a man in Wichita just to watch him dive...(inventor)

  6. #6
    Guppy
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    I dive an LP95 and a slung AL40. If I lost my back gas and switched to my pony, the dive is over. There is no need to put more gas in the suit... just start ascending.

  7. #7
    Barracuda Founding Member
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    I don't see the need to use a slung tank for drysuit inflation. Seems like a problem looking for a solution. How is the hose routed.

    Unless your diving trimix I would just use my back gas. Simple easy and it works.

    Also if your slinging an tank I would get a Al 40.

    Most divers that use a dedicated bottle for suit inflation are doing so because they are diving mix. Helium is a poor insulator because it's molecule size is very small. Argon is the best because it's inert and has a larger molecule size. Many divers using a dedicated bottle will use just air since it's cheaper and easier to find.

  8. #8
    Grouper
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    I used a 19 slung for drysuit inflation and back up air on 1 dive trip, used a total of 4 cu ft for 5 dives.
    Got home and took the inflator off of the pony, just don't use that much air in the drysuit.

    Jim Breslin

  9. #9
    Grouper
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    Cant see the upside.. Only use enough back gas in my drysuit to take away the squeeze. Would suggest a bigger primary tank if gas usage is the real concern. I'm with the 50% 40cf slung bail out bottle crowd.
    There is a God... Come diving I'll show you!!
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