Options for onboard gas access.

Drmike

yuck

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Drmike

Why not get rid off all that hardware and utilize the LP port areas inside the onboard 1st stages as manifolds.

All you need is 2 QCs.

Onboard feed everything incl BOV.

If you are in danger of exhausting the onboard dil when youve bailed you close off the dil valve (if you want) and connect the QC hose to the off board dil. Now your running BOV, adv, and inflation off off board dil.

If you want to plug in off board o2 then theres also a male QC coming off on board o2 1st stage (o2 whip feed will be female dil male). if you want to breath onboard O2 thru the BOV you can by connecting o2 qc to dil qc (as you will be at 6m it doesn't matter that adv is connected now to o2)

see below: lot cleaner.

If your worried about a leak on hoses then just add one QC at the BOV (then you can connect off board dil direct to BOV)

No need to get too paranoid about securing against every poissible scenario of bust hoses etc - it may apear safer but the more complexity you add the less safe it will be. Total loss of onboard dil or O2 is not an emergency situaton provided you have bail out. worst case scenario just blow it in the loop

Attached Images

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Drmike

This is my setup.

With Just 3 sets of QCs I can do everything.

Attached Images

BOV%20Onboard%20Plumbing2_MG.JPG (17.5 KB, 298 views)

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steveharriss

That's really simple and makes sense. Do you need QD's with check valves or isn't this an issue?

Drmike

I dive with the onboard gas just feeding the ADV. Everything else run (via the QC) off the off board.

The only reason Id ever need to plug together the on board gas to the BOV and wing feed line is if Ive run out of bail gas (thats normally feeding it) - in which case no need for check valve.- or you can just disconnect the offboard gas before connectiong the on board :-)

The wing inflation can be connected to the onboard if people wish - I dont seeing as I would empty my 2L tanks quite fast on a deep dive!

But dont listen to me Im mentaly unstable

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decoweenie

When I first started diving Rebreather, I too wanted to add more complexity to the rig hoping to eliminate all possible failures.

Over the years, these added complexities became the failures.

Honestly not trying to teach you to suck eggs here...

I try to keep it "KISS" as much as I can by eliminating as many connections as I could when possible - as it helps to narrow down the chance of making the worng choice in time of crisis.

For example... Do I connect this to here, or here, or here while I am holding my breath at 90m ? And sinking...

IMHO, the more linkages between your options, the bigger chance that a single failure could take down all of the options. Or the bigger chance of selecting the wrong option.

Do keep an eye out for working configurations from those who have dived a lot or longer than you have, chances are they will be a lot more simple and streamlined since they have gone thru the proces of trial-and-error.

Good luck with your configuration.

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Gilles

It is a first draft.

Feedback is appreciated, and being digested. LP ports on Poseidon regs not do-able (due to only 2LP ports and 1 needed for OP valve), but yes on the Apeks ones. That is a good original idea, thanks.

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Drmike

You can just T into the hose, screw a T piece into the LP port or make up/buy a manifold (this is what I did with Boris (it uses Poseidon regs))

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Dave Sutton

Gack......

I'm doing more or less what DrMike is doing, using CEJN's for the QD's so that hoses can go directly to breathing regulators (BOV, etc) in time of need. I'd think that the kluge of stuff into that switch valve is just way too much. As Phi says, the attempt to ensure a path after any failure *becomes* the points of failure. If simple = good, then the opposite is true. That's a pretty complex system..... just a comment.

Adding ports to the first stages is not hard.. use T's and that's that. If you need any custom manifold work, let me know, as I can whip them out in brass with any desired port including 3/8-24 with the *correct* O-Ring counterbore included (have the special reamer to cut the bore). Easy stuff.


Dave

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Dave Sutton

Wanted to point this out too.... you don't need to have your offboard dil connected to anything other than your BOV. If you want to add it to the loop, inhale on the BOV, turn the knob, and exhale into the loop. That's a zero additional-hardware, dead-foolproof method. Just make sure the gas is PP02 viable at the depth.


Dave

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