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Old 29th April 2011, 02:17   #1 (permalink)
Dave Tomblin

 
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Wet connecting QCs

I have always wondered about how big a problem wet connecting QCs in the water was. My BOV is attached to a QC6 which I usually attach in the water. I figure a 2nd stage can tolerate a small amount of moisture but I ensure I rinse the BOV after each dive.
A recent thread concerning an O2 injection valve sticking got me wondering how much water actually passes through the QC when it is wet connected. I filled my sink with water, attached my reg to a small tank and connected the QC6 under water. I then discharged the hose into a clean paper towel.

I was surprised at how much water is introduced by one iteration of attaching a QC. This is a small problem when injected into a second stage that gets rinsed after each dive but you can imagine how harmful salt water would be to a small oxygen valve or worse yet an oxygen MAV orifice?
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Last edited by wedivebc; 29th April 2011 at 02:22..
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Old 29th April 2011, 02:30   #2 (permalink)
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Re: Wet connecting QCs

Quote: (Originally Posted by wedivebc) View Original Post
I have always wondered about how big a problem wet connecting QCs in the water was. My BOV is attached to a QC6 which I usually attach in the water. I figure a 2nd stage can tolerate a small amount of moisture but I ensure I rinse the BOV after each dive.
A recent thread concerning an O2 injection valve sticking got me wondering how much water actually passes through the QC when it is wet connected. I filled my sink with water, attached my reg to a small tank and connected the QC6 under water. I then discharged the hose into a clean paper towel.

I was surprised at how much water is introduced by one iteration of attaching a QC. This is a small problem when injected into a second stage that gets rinsed after each dive but you can imagine how harmful salt water would be to a small oxygen valve or worse yet an oxygen MAV orifice?
Thank you for posting the experiment result. It is most useful information.

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Old 29th April 2011, 04:46   #3 (permalink)
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Re: Wet connecting QCs

Hi dave
I had a brief chat with Mr Gurr at Oz tek and that's was one of the reasons he opted for the different QC on boris and sentinel
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Old 29th April 2011, 04:55   #4 (permalink)
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Re: Wet connecting QCs

Quote: (Originally Posted by tecdivertraining) View Original Post
Hi dave
I had a brief chat with Mr Gurr at Oz tek and that's was one of the reasons he opted for the different QC on boris and sentinel
What does he use now Matt?
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Old 29th April 2011, 05:14   #5 (permalink)
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Re: Wet connecting QCs

Quote: (Originally Posted by tecdivertraining) View Original Post
Hi dave
I had a brief chat with Mr Gurr at Oz tek and that's was one of the reasons he opted for the different QC on boris and sentinel
Hi Matt,

Are you kidding ???
The QC on the Boris are Swagelok keyed QC6 !!! And they are mounted the opposite way they should be.
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Old 29th April 2011, 05:26   #6 (permalink)
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Re: Wet connecting QCs

I always thought the QC6 were pretty good at limiting water ingress. I dont know for sure but my guess is the omni style with a check valve instead of a DESO would be worse. There are QC'sout there that will be better than the QC6's in this regard.

I use QC6's for off board DIL/bailout on my rEvo ( Used them for O2 and DIL on my IDA71). I have never connected them underwater and I dont see a reason to do so for my self.
I do disconnect them in water at the end of the dive though.

When you say you rinse your BOV after each dive do you mean you force water into the LP inlet? or do you just put water in to the mouth piece?
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Old 29th April 2011, 05:42   #7 (permalink)
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Re: Wet connecting QCs

Quote: (Originally Posted by Stephane) View Original Post
Hi Matt,

Are you kidding ???
The QC on the Boris are Swagelok keyed QC6 !!! And they are mounted the opposite way they should be.
Really?
I wonder why they are keyed? Is the DIL and O2 keyed differently?

As to having them around the wrong way I wonder what effect this has.
The QC 6's have a pretty high flow rate so I doubt having them around the wrong way will really be a problem in that regard.
But perhaps it has something to do with the spring tension in the male vs female fittings.
If the spring tension was less in the tank side then it would open up before the rebreather side. This would mean gas would escape and displace water before the rebreather sided opened.
So perhaps the right way vs the wrong way is simply a way to either stop water ingress or stop gas loss depending on what is more important on that particular set up ( more thinking about hydraulic fluid loss vs air ingress here).

Last edited by Packhorse; 29th April 2011 at 05:45.. Reason: swapped a m for a w.
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Old 29th April 2011, 05:49   #8 (permalink)
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Re: Wet connecting QCs

You are absolutely right Packhorse.
They are keyed to prevent a bad connection (well, I suppose this is the reason, I don't have a Boris).
And yes, the stem (female) opens first when you connect the body (male) but even with that, there is still some water ingress that is not important in a second stage (just breathe on it to let the water go out) but can clog an orifice.
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Old 29th April 2011, 06:18   #9 (permalink)
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Re: Wet connecting QCs

I may be missing something here

If the QC6 on the rebreather is pressurised (from the dill) and i connect my QC6 from my bailout, which is also pressurised, why would it make a difference which goes into which

Surely, the female going into the male only matters if the other line isn't pressurised

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Old 29th April 2011, 06:31   #10 (permalink)
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Re: Wet connecting QCs

Sure, if both are pressurised ( as mine are in my rig... Offboard DIL/bailout- on board DIL)

But if your using off board O2 and no on board tank then only one side is pressurised and the other is at ambient.
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