Passed Negative-test and still flooded...

bourskov · 21st July 2007, 20:45

Hi...

I vent for a dive yesterday, after doing a service of my OPV in the counterlungs... I did all the predive checks as discribed, and it passed...

Under the dive I heard this gurgeling sound when I exhale. So I thourgth, maybe it's just a tiny amount of water, like if I didn't empty the mouthpiece correct. During the dive (~40 min @ 12-13 meters) I didn't have any problems...

But when I got home and took the unit apart, it became clear that there wasa problem... It was flooded... Half of the scrubber was soaked, so there were some cleaning to do...

After cleaning and reasembling I preformed a negative test, and like before the dive, no problems... But as I tried to do a kind of positive test, it turned
that there was a problem with the OPV. I didn't resist very much pressure, and therefore (I was told by another Boris-diver) the water can enter the lung during a dive...

So the big question is... Does you Boris-divers outthere do a kind of positive test on your units?!

I am well aware, that you can't do a real positive test, without blocking out the OPV....

Cheers
Bo Urskov

iani · 21st July 2007, 21:51

Been there, several times

Sounds like some 'lime in the OPV, it probably worked fine for your negative but during the dive a granule or two of lime got stuck in the OPV and water gets in. The OPV is very unforgiving of anything coming into contact with it, cleanliness is the key here.

Ian

Frankie Pellegrino · 22nd July 2007, 13:33

Hey Bourskov
I posted a old thread about a filter for the OPV with pictures. Read this post!!!
There are some negative points to making this modification ....but the benefits to installing this filter out way any of the negatives. In the past
I also had water in my canister and failed negative tests. I have about 75+ dives with this filter and it is a perfect solution. It really works!!! I might have a extra filter.....If I can find it would you like me to mail it to you? Good luck
Cheers Frankie

bourskov · 22nd July 2007, 14:26

Ian: I found that it wasn't some lime, but some Aquasure, from the sealing...

I must not have cleaned it proberly after sealing it a few days ago....

Frankie: That looks great... I think I'll do this... My Boris-buddy had a flood because of sofnolime in the OPV during his course, so he might like it to

Bo Urskov

Andy C · 24th July 2007, 18:54

I may have had a similar problem.

Unit flooded every dive but passed negative tests including when it was absolutely full of water. It would not hold any sort of positive test.

It went back to the factory and they discovered that the spring in the OPV was fatiguing. I believe they then sent replacement springs to all users.

bourskov · 25th July 2007, 06:55

Quote: (Originally Posted by Andy C)

I may have had a similar problem.

Unit flooded every dive but passed negative tests including when it was absolutely full of water. It would not hold any sort of positive test.

It went back to the factory and they discovered that the spring in the OPV was fatiguing. I believe they then sent replacement springs to all users.

That's interesting...

How long ago did you learn about this?

Bo Urskov

Andy C · 26th July 2007, 18:28

My problems got worse as last sumer progressedand the unit became undivable in late september (a very frustrating week in France!).

The factory had the unit from then for about 8 weeks in total having tried various fixes to eradicate the problem before the spring was isolated.

G4SSG · 26th July 2007, 18:47

HI
would replacing the opv with something more substantial (si tech dump valve )resolve this ...these also carry a filter & possible too pre-set before diving ,for the positive test....any thoughts on this ......martyn

Frankie Pellegrino · 27th July 2007, 00:48

G4SSG
I spoke to Kevin about this a year ago and he would have to do a whole new EXPENSIVE CE test again. I think he should have made a better choice for the OPV….But the few modifications that he released seemed to work for me. I also LOVE the filter I put on my counter lung. If some one did change their OPV please post pics and how they like it.
Cheers Frankie

aknelson · 12th September 2007, 04:22

Quote: (Originally Posted by Frankie Pellegrino)

G4SSG
.....I think he should have made a better choice for the OPV….But the few modifications that he released seemed to work for me. I also LOVE the filter I put on my counter lung. If some one did change their OPV please post pics and how they like it. Cheers Frankie

Attached how the valve looks installed with a 22Mesh SS sieve insert. The mesh material opening is a around 1.0mm I looked at 24 mesh 0.9mm material but the net opening area is getting too small.
I will see how good it will hold. I added a small groove so the mesh will hold a bit better inside the funnel. It was a bit tricky to cut the mesh material a piece of tape helped cutting and forming the mesh insert. http://www.rebreatherworld.com/image...es/biggrin.gif

.

Greetings Andreas
DSC04362sc.jpg

21st July 2007, 20:45	#1 (permalink)
bourskov New Member Current Rebreather/s: Ouroboros Other Rebreather/s: Inspiration Classic Join Date: Nov 2006 Location: Denmark Posts: 92	Passed Negative-test and still flooded... Hi... I vent for a dive yesterday, after doing a service of my OPV in the counterlungs... I did all the predive checks as discribed, and it passed... Under the dive I heard this gurgeling sound when I exhale. So I thourgth, maybe it's just a tiny amount of water, like if I didn't empty the mouthpiece correct. During the dive (~40 min @ 12-13 meters) I didn't have any problems... But when I got home and took the unit apart, it became clear that there wasa problem... It was flooded... Half of the scrubber was soaked, so there were some cleaning to do... After cleaning and reasembling I preformed a negative test, and like before the dive, no problems... But as I tried to do a kind of positive test, it turned that there was a problem with the OPV. I didn't resist very much pressure, and therefore (I was told by another Boris-diver) the water can enter the lung during a dive... So the big question is... Does you Boris-divers outthere do a kind of positive test on your units?! I am well aware, that you can't do a real positive test, without blocking out the OPV.... Cheers Bo Urskov
(Offline)

21st July 2007, 21:51	#2 (permalink)
iani Nefarious Activist Current Rebreather/s: Ouroboros Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: Middlesex, UK Posts: 334	Re: Passed Negative-test and still flooded... Been there, several times Sounds like some 'lime in the OPV, it probably worked fine for your negative but during the dive a granule or two of lime got stuck in the OPV and water gets in. The OPV is very unforgiving of anything coming into contact with it, cleanliness is the key here. Ian
(Offline)

22nd July 2007, 13:33	#3 (permalink)
Frankie Pellegrino Custom Title Allowed! Current Rebreather/s: Classic Kiss Ouroboros Other Rebreather/s: Inspiration Classic Join Date: Jan 2006 Location: NYC New York Posts: 134	Re: Passed Negative-test and still flooded... Hey Bourskov I posted a old thread about a filter for the OPV with pictures. Read this post!!! There are some negative points to making this modification ....but the benefits to installing this filter out way any of the negatives. In the past I also had water in my canister and failed negative tests. I have about 75+ dives with this filter and it is a perfect solution. It really works!!! I might have a extra filter.....If I can find it would you like me to mail it to you? Good luck Cheers Frankie
(Offline)

22nd July 2007, 14:26	#4 (permalink)
bourskov New Member Current Rebreather/s: Ouroboros Other Rebreather/s: Inspiration Classic Join Date: Nov 2006 Location: Denmark Posts: 92	Re: Passed Negative-test and still flooded... Ian: I found that it wasn't some lime, but some Aquasure, from the sealing... I must not have cleaned it proberly after sealing it a few days ago.... Frankie: That looks great... I think I'll do this... My Boris-buddy had a flood because of sofnolime in the OPV during his course, so he might like it to Bo Urskov
(Offline)

24th July 2007, 18:54	#5 (permalink)
Andy C New Member Current Rebreather/s: Ouroboros Other Rebreather/s: Join Date: Mar 2007 Location: London Posts: 3	Re: Passed Negative-test and still flooded... I may have had a similar problem. Unit flooded every dive but passed negative tests including when it was absolutely full of water. It would not hold any sort of positive test. It went back to the factory and they discovered that the spring in the OPV was fatiguing. I believe they then sent replacement springs to all users.
(Offline)

25th July 2007, 06:55	#6 (permalink)
bourskov New Member Current Rebreather/s: Ouroboros Other Rebreather/s: Inspiration Classic Join Date: Nov 2006 Location: Denmark Posts: 92	Re: Passed Negative-test and still flooded... Quote: (Originally Posted by Andy C) I may have had a similar problem. Unit flooded every dive but passed negative tests including when it was absolutely full of water. It would not hold any sort of positive test. It went back to the factory and they discovered that the spring in the OPV was fatiguing. I believe they then sent replacement springs to all users. That's interesting... How long ago did you learn about this? Bo Urskov
(Offline)

26th July 2007, 18:28	#7 (permalink)
Andy C New Member Current Rebreather/s: Ouroboros Other Rebreather/s: Join Date: Mar 2007 Location: London Posts: 3	Re: Passed Negative-test and still flooded... My problems got worse as last sumer progressedand the unit became undivable in late september (a very frustrating week in France!). The factory had the unit from then for about 8 weeks in total having tried various fixes to eradicate the problem before the spring was isolated.
(Offline)

26th July 2007, 18:47	#8 (permalink)
G4SSG New Member Current Rebreather/s: Ouroboros Home Build Other Rebreather/s: Inspiration Classic Megalodon Home Build Join Date: Dec 2005 Location: UK...Midlands Posts: 56	Re: Passed Negative-test and still flooded... HI would replacing the opv with something more substantial (si tech dump valve )resolve this ...these also carry a filter & possible too pre-set before diving ,for the positive test....any thoughts on this ......martyn
(Offline)

27th July 2007, 00:48	#9 (permalink)
Frankie Pellegrino Custom Title Allowed! Current Rebreather/s: Classic Kiss Ouroboros Other Rebreather/s: Inspiration Classic Join Date: Jan 2006 Location: NYC New York Posts: 134	Re: Passed Negative-test and still flooded... G4SSG I spoke to Kevin about this a year ago and he would have to do a whole new EXPENSIVE CE test again. I think he should have made a better choice for the OPV….But the few modifications that he released seemed to work for me. I also LOVE the filter I put on my counter lung. If some one did change their OPV please post pics and how they like it. Cheers Frankie
(Offline)

12th September 2007, 04:22	#10 (permalink)
aknelson New Member Current Rebreather/s: Ouroboros Dolphin Other Rebreather/s: Ouroboros Dolphin Join Date: Dec 2005 Location: Minnesota Posts: 70	Re: Passed Negative-test and still flooded... Quote: (Originally Posted by Frankie Pellegrino) G4SSG .....I think he should have made a better choice for the OPV….But the few modifications that he released seemed to work for me. I also LOVE the filter I put on my counter lung. If some one did change their OPV please post pics and how they like it. Cheers Frankie Attached how the valve looks installed with a 22Mesh SS sieve insert. The mesh material opening is a around 1.0mm I looked at 24 mesh 0.9mm material but the net opening area is getting too small. I will see how good it will hold. I added a small groove so the mesh will hold a bit better inside the funnel. It was a bit tricky to cut the mesh material a piece of tape helped cutting and forming the mesh insert. http://www.rebreatherworld.com/image...es/biggrin.gif . Greetings Andreas DSC04362sc.jpg Last edited by aknelson : 12th September 2007 at 04:25.
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