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Thread: Off board gas

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    Off board gas

    What's the best way of getting off board gas into a Classic?

    Via the BOV? Via the manifold? A 2nd. MAV?

    Interested in how you do it and how you'd do it in an ideal world?

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    On my unit I run the off board deep gas to the BOV.
    I have a second MAV fitted to the dil and into the left
    side of the head, it takes a direct feed fitting so I can
    plug in off board O2 if needed.
    I don't use it during regular diving as the ADV is just so
    easy to use.

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    Off board gas

    I bought a rEvo 3 Gas MAV, with orifice, and you can add an off board gas to the bottom, which works well.
    I also sometimes have an AP GCS quick (ish) disconnect or an omniswivel on a hose into the dil reg, so you can plug your bailout into you unit and have access for BOV or dil, whatever. Only good for normoxic stuff with no switching.


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    Last edited by Dave1w; 17-03-2016 at 06:47 AM.

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    Quote Originally Posted by mrmints View Post
    What's the best way of getting off board gas into a Classic?

    Via the BOV? Via the manifold? A 2nd. MAV?

    Interested in how you do it and how you'd do it in an ideal world?
    Plug it into the Diluent MAV, disconnect the inboard. I do this reasonably frequently on long trips when deep bailout doubles up as diluent gas.

    On a Malta trip I ran 10/50 from onboard into loop via MAV (just one dil/o2 MAV), the inboard 3L had Air for 40m max. dives + suit/wing inflate.

    No difference in use between Classic/Vision, I've owned dived both.

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    Quote Originally Posted by mrmints View Post
    What's the best way of getting off board gas into a Classic?

    Via the BOV? Via the manifold? A 2nd. MAV?

    Interested in how you do it and how you'd do it in an ideal world?
    Assuming you want off-board to the loop, then for me (though mine's a APD Vision but it shouldn't make any difference) it would be to disconnect the MAV feed and connect the stage cylinder's LPI hose to it instead. This applies to the O2 or dil side in my case. Assuming you want off-board to the BOV, I use the APD GCS hoses with the female on the stage and the male straight from the BOV.

    FWIW, I can't see the point in a second MAV - it's another potential thing to leak and why would you need to add two different gases at the same time? With only one connected (and from two clearly different sources), there's no mistaking what you are adding. Can't see the point of connecting to the manifold either, as then you need to mess about with closing valves, flow-stops or fiddling with IPs to stop one cylinder attempting to fill the other, plus for me, a reason to be using off-board gas is that the on-board side has sprung a big leak (perhaps due to a burst hose for example) and by connecting the off-board through the manifold, you'll just drain that too through the same leak.

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    Why dont you just plug it into the mav on the lung when needed?

    I've messed about with offboard connections on various units and always end back at the start. If you dont need to add extra failure points then dont.

    With a back mounted lung, I just use my bov to blow offboard gas into the loop if needed.

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    Quote Originally Posted by notdeadyet View Post
    With a back mounted lung, I just use my bov to blow offboard gas into the loop if needed.
    I assume you descend, when you can't get a lung full of gas, flip BOV to OC, get lung full of gas, flip BOV to CC, exhale lung full of gas into loop......

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    I think you guys have missed that this is in the KISS section

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    Quote Originally Posted by Capt Morgan View Post
    I think you guys have missed that this is in the KISS section
    Don't mention KISS, you'll have Chasey blathering on about his KISS again (again meaning his 2nd KISS)

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    Quote Originally Posted by JPTaylor View Post
    I assume you descend, when you can't get a lung full of gas, flip BOV to OC, get lung full of gas, flip BOV to CC, exhale lung full of gas into loop......
    Yep. I've tried various alternatives but a CEJN connector on the BOV is nice and simple for adding gas.

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