Running the dil from a bailout bottle.

It might have been my post you saw. I have a couple of units, that I am diving ( or planning to) very shallow,
Maybe 20 metres, and just have a small onboard oxygen with Dil running off a side slung bottle through a decent QD. I haven't really given thought to these deeper, or trying this on my other rebreathers though.

Dave
 
Mike Ferguson said:
Air diving I run ADV / MAV / BOV / wing / suit from onboard 3L of air.

Mix diving I run ADV / MAV / BOV from my deep bailout and wing / suit from onboard 3L of air.

In reality you actually use very little out of the deep bailout as it is only used as dil to fill the counterlung on the descent. All the wing and suit gas comes from the onboard 3L of air.
Click to expand...

This is the same as my setup.

And I have a switch block that allows me to switch to air as dil on the surface on Hypoxic dives, so at the surface if I pull on the ADV it has a breathable mix to it at all times.

I usually switch at the 40' stop. At that time I actually disconnect my deep bailout gas.

Danny
 
Ran my unit like so:

Butt-Mounted Bailout Bottle: Plugged into Whitey Valve for Dil Switching, Connected to 2nd Stage Reg clipped off on my D-Ring (later put on a "necklace" a la DIR dudes), Hooked into BCD Inflator.

This left my onboard Dil sphere for Semi-Closed and Makeup Gas for the loop.

I would run only Air in the Bailout Bottle, and keep the Mix in the onboard sphere. (Logic: Even on deep dives, you can generally figure your 1st Stop will be around 1/2 of your depth, which makes breathing Air ok, so why bother with mixes of different sorts, etc? - If you're in a Bailout situation, you're not hanging around your MOD anyway (unless you're in a Cave or Wreck - different story - I'm an open ocean dude, which is how this philosophy evolved)).

If we were doing really deep or long dives, we'd carry additional gas, which had identical quick-connects on the LP side so we could plug that into either the OC 2nd stage (the hose to it was broken in the middle with a Quick Connect, so you could keep it in your mouth while you plugged into another gas source).

We would also stage bottles on the Anchor Line (Bottom, Middle, and O2 at 20 feet) - and sometimes we'd even stage bottles around the Reef we were working on - making the aforementioned butt-mounted bailout bottle a form of "travel gas" to get to the next stage.

We were taught the "total reliance on the unit" method of diving back then, so the idea of using the onboard dil for anything other than semi-closed on the unit was considered a no-no...

Disclaimer: Just discussing what we did - I know the methods of Bailout have evolved, but I still like the idea of having your Bailout Gas plumbed into your unit somehow so accessing it is easy...

Kevin.
 
SlowDiver said:
On another topic from this forum one of the CCR divers mention that he runs his dil from one of his bailout bottles. This got me too thinking (which gets me in trouble) how many use your bailout gas for the dil, BC, dry suit, etc. My thinking is I want the bailout bottles to be full if I need them.

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First off, happy birthday Fred!

I will usually run everything from onboard diluent with bc hoses on all bailouts in case of a failure. I still use Omni swivel QC on all bailout in case of lose of onboard diluent.

One way to do it. I like my bailout to be full too. I am also one in the camp who would rather have redundant bailout at least two cylinders and two first/second stages.

Garth


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If it's your birthday, Fred, then happy birthday. If it's just Garth posting on a thread after 2+ years, I'd like to know what stirred up the bees in his bonnet.


iPhone. iTypo. iApologize.
 
I would like to give you my opinion:

1) the ppO2 of the onboard dil must be 1.0 at max deep. You would need to cheeck you sensors or you would like to dowm your ppO2.

2) The ppO2 of your bailout must be 1.6 at max deep. You would like to have a hig ppO2 bailout gas for the decompression.

3) you can't feed your wing and you drysuit from the same gas source. If you lost this tank, you will lost all your flotability.

4) If you used your TX bailout for the drysuit, you would get cold and the helium will go thrue your skin.

With this four points in my mine i use:

Onboard tx for ADV, BOV, Wing.
Air/Argon 2L tank for my drysuit.
Bailout connectec but closed to the manifoult feeding as the onboard.
Flowstop for desconect the bailout fron everyting but the BOV.

This is my setup.
Mikel
 
Hi Mikel -

You are entitled to your opinion and your setup might work for you. Personally I think your way is dangerous, and your use of the word "must" is probably a result of language difficulty.

I do not use bailout gas with a pO2 of 1.6. I am less concerned with saving some deco time than I am with avoiding death from a hyperoxic seizure. Susceptibility to oxygen toxicity is significantly enhanced in the presence of hypercapnia. Bailing out to a 1.6 gas after a CO2 hit is something I prefer to avoid, so I choose my bailout gas accordingly.

I also do not choose an onboard dil that is 1.0 at depth. I prefer to use my offboard bailout as deep dil and have an onboard dil that is breathable at the surface. If I disconnect my offboard tanks at the surface, I still have a breathable gas connected to my BOV and ADV.

These are just my opinions and I do not believe that anyone "must" do the same.


iPhone. iTypo. iApologize.
 
kwinter said:
Hi Mikel -

You are entitled to your opinion and your setup might work for you. Personally I think your way is dangerous, and your use of the word "must" is probably a result of language difficulty.

I do not use bailout gas with a pO2 of 1.6. I am less concerned with saving some deco time than I am with avoiding death from a hyperoxic seizure. Susceptibility to oxygen toxicity is significantly enhanced in the presence of hypercapnia. Bailing out to a 1.6 gas after a CO2 hit is something I prefer to avoid, so I choose my bailout gas accordingly.

I also do not choose an onboard dil that is 1.0 at depth. I prefer to use my offboard bailout as deep dil and have an onboard dil that is breathable at the surface. If I disconnect my offboard tanks at the surface, I still have a breathable gas connected to my BOV and ADV.

These are just my opinions and I do not believe that anyone "must" do the same.


iPhone. iTypo. iApologize.
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