Running the dil from a bailout bottle.

SlowDiver

SlowDiver

Member
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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A lot of SM CCR divers use their BO as their DIL. I am not saying this is the best way just saying it happens.


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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.
 
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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Click to expand...

I always carry 2 bailouts of my bottom gas on me at all times. One feeds my wing and has a Omniswivel QD on the 1st stage and a 2 meter hose w/ reg. The other feeds my drysuit and my CCR (which is the ADV and BOV, I had them running from separate tanks for awhile but felt it was too much stuff), with another 2 meter hose w/ reg and an Omniswivel QD on the 1st stage.

Honestly, I use such a small amount of gas from the bailout bottle, it isn't even factored in. I really pad my bailout calculations, so I have a lot more than I (hopefully) will ever need. On a dive with lots of up and down I will use ~300 psi out of the tank that runs my rebreather, the one connected to the wing is barely touched. This is all factored in so that I would rather carry a spare 3L of O2 for emergencies. I feel that is slightly more important than the small amount of gas I use from the bailout bottle.
 
if you are running trimix in your BO, its not a good idea to use it for suit because of how helium diffuses into the skin.

And of course cost as well.

I have a separate bottle of straight air that drives my suit and wing.
 
Mix Dives I use On board dil for ADV, MAV, BOV, wind.
Off board bailout connected but closed tank. Just if i need it, i will open the tank for BOV or in case i've lost my dil.
Air/argón for dry suit.

I always have two rules:
1) Dry suit and Wind from diferent tank.
2) Dil is dil and bailout is bailout. The PPo2 of the dil must be lower than the PPo2 of de bailout.

My two cents.
Best
 
One diluent runs everything except suit inflation. ADV, MAV, BOV and wing all run off a diluent manifold. Dil feeds the manifold from a 3-way ball valve connected to onboard and an offboard tank that serves as both deep dil and deep bailout. As Jordon said, the amount used for dil doesn't really impact the availability to have it for bailout.

For deep dives, onboard is always at least normoxic. Hypoxic dil/bailout is always offboard.
 
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...

Nearly the same here:
Airdiving: ADV/MAV/BO-regulator/Drysuit from onboard 3l Air.
Wing from onboard O2 (Never Used)
Bailout optional, but connected to manifold if I bring it.

Mix-diving:
ADV/MAV/BO-regulator from deep bailout (Tx18/45), through manifold.
Wing from onboard O2 (Never used)
Drysuit from Onboard 3l. Air.

I have my own booster so topping off the Tx-bottle from a bank bottle is no big deal, and is done after 3-4 dives.
BTW: I never bring a tank I can't breathe OC, that goes for the 3l Air and O2 onboard.
 
Red Hat Jef said:
Does it get confusing when you need to plug in different gasses, with two connections like that? Not judging - just asking.
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No, not at all! As long as the content of He is the same on both... :luke:

As you can see in this picture the MAV on the exhale is not in use and is ready to connect to the offboard.
 
Hanssing said:
I have my own booster so topping off the Tx-bottle from a bank bottle is no big deal, and is done after 3-4 dives.
BTW: I never bring a tank I can't breathe OC, that goes for the 3l Air and O2 onboard.
Click to expand...

ditto. I can't understand anyone carrying a suit bottle they can't breathe off or not having OC access to the O2 they are carrying.
 
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...

Same here....

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Mike Ferguson said:
ditto. I can't understand anyone carrying a suit bottle they can't breathe off or not having OC access to the O2 they are carrying.
Click to expand...

Well - that all depend of the water temperature! Lot of people like to use argon instead of electrical under suits when it starts to get colder.
 
I run MAV, ADV, BOV and Wing off a switchblock that can take either backgas or off-board. Suit runs of a seperate air cylinder.

That way I use my bailout for dil during the dive, I know if I need to dil-flush or bail I have enough gas to do this.

Possible downsides are a leak in the LP hose to wing or something like that. I can quickly disconnect the bailout via a swage-lock to the switchblock, so minimise gas loss.
 
Robert Månsson said:
Well - that all depend of the water temperature! Lot of people like to use argon instead of electrical under suits when it starts to get colder.
Click to expand...

Not so sure Argon makes much of a difference to be worth it actually. Used to use it before but now i don´t bother.
 
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