BOV: From design to implementation

Gilles

So much for the original plan:
http://www.rebreatherworld.com/bail-...-critique.html

When I started putting it all together, I read a post Dave Sutton put up advising using offboard as a kind of plug and play, and using onboard for utility (ie. wing/suit inflation). Interesting.. and when I started putting the bits together, I found that hey...,

1) the ADV flow-stop fits nicely into the in-port of the Y-block
2) the Y-block is just a simple manifold. It doesn't matter from which port the supply comes in.
3) BOV supply hose routing not that bad by going around the CL T-peice
4) Swivel does an excellent job at minimizing hose interference for head turning.

So here's how it looks (so far). I know its ugly without the loop covers.

photo 1: showing Y-block -ADV flow stop. Hose to BOV goes back around the CL T-peice. System supply hose goes back over the top of the CL, and down the other side where it is velcroed together with the wing inflator (not shown)

photo2: demonstrating effectiveness of swivel

Room for further refinement and it has yet to go in water. I could also change the side of the BOV so that I can route the supply hose around the back.

The onboard dil has been demoted to wing supply (and its HP gauge and hose removed).

There is no switching to onboard if I have to disconnect and hand-off the offboard. As is, the wing inflator QD is just long enough I can connect it to the CL man-ad in case there is a need for further descent following loss of offboard supply.

This is a work in progress. I'm interested in critique for the purpose to improve the installation. Be my guest

Attached Images

	DSC00615.JPG (137.0 KB, 463 views)
	DSC00621.JPG (143.6 KB, 466 views)

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Gilles
http://www.dirrebreather.com

divetheworld

Another thought would be to consider being able to plug into your onboard O2.

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Dave Sutton

All looks good!

I'm trying now to write up a little article on how I plumb my system to have a single point for plugging in offboard, with a valve that selects either "onboard" or "offboard" gas, and which routes that selected gas to both the loop and the BOV, while *always* running the suit from inboard diluent. Makes it even better, and is not rig-specific. I'm just trying to figure out a nice way to draw the diagrams.

Nice work so far! Glad the idea of using the inboard gas for utility makes sense.

Dave

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Explorer

Nicely done Gilles. Very clean access to the isolator on your ADV. I was routing my Golem BOV all the way back to my onboard gas and wondering how to use my Y manifold with it but now with your pics, I have some rerouting to do today. Too cool. Thank you for your pics.

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Gilles

I'm thinking about that. Seems like a nice to have (rather than a value adding necessity) though. It would only be needed if I lost the inhale side of the loop.

Still forming this opinion. Please counter.

Much credit goes to Dave Sutton for causing a change of plan, resulting in a number of redundant peices of plumbing hardware .

Thank you for this very original idea (and be greened yet again). When completed, your above article will not be in vain. I for one will read it with interest.

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Gilles
http://www.dirrebreather.com

trob09

Nice approach. FWIW, here's how I have mine plumbed. All of my stage regs have corresponding swagelok connectors so I can plug in any of my stages to feed both the BOV and the ADV/wing

http://www.rebreatherworld.com/bail-...tml#post101578

Explorer

Thanks Dave.

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divetheworld

No, I think you have it nailed quite well. how you acheive access to it would be a matter of personal choice.
And I couldnt agree more that having access to inboard O2 should not be part of the bail plan but when the smelly stuff hits the fan, it's nice to have that particular comfort zone.
My old config -> GRP Services

Brent

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Dave Sutton

Why not? Gas is gas..... bailout is done for flooded loops... and that does not affect the gas, no matter where carried. The fact of the matter is that much of the "sport diving" done with Rebreather's can be bailed out of using inboard gas only *IF it's all accessable for OC*.

Using a CEJN quick connect hose to the 02 supply, allowing it to be plugged into an OC reg of some sort when needed really expands the matrix of possibilities. Combine that with some *sensible* diluent and you can do a lot with the internal supplies of most rigs. Not "everything", but a lot.

All of my gas is part of my bail plan. I plan to be able to bail out SCC using *any one* of my gas supplies (internal diluent only when diving single dil, *either* of the two diluents only when carrying mix, or using 02 only) and OC using *"one out of two" or "two out of three"* of my gas supplies (either one or two diluents plus 02). Using diluents with enough 02 is the key here... diving deep my "utility gas" (meaning onboard diluent) goes to 50/50 nitrox, while the offboard trimix stays normoxic as long as possible.

02 = life. Carry it mixed, carry it pure, but carry it and be able to ACCESS IT.



Dave

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Dave Sutton

The Little Diveshop of Horrors will always be glad to accept donations of wayward and unwanted hardware.
Who knows what will rise from the ashes of someone elses discards?


Dave

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