Bad design of boris'sloop?

Drmike

Fully agree. As I have mentioned if the loop is kept clean the OPV works fine.

Its not muck tolerant - but if theres no muck.......

I have not had a problem at all really before this event. It was the first dive with a brand new CL. I had assumed it would be clean - but some loose aqualseal was in it left over from the CL-OPV assembly I guess and thats what got into the OPV. After its removal and on subsequent dives the OPV was fine (the old design was fine too)

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Marc T

Hum, my mistake you wrote "Ive been blessed with a good OPV" but lol always my poor english, blessé in french mean hurted so n ot really un der stood.

Say that because the tone of some message are sometime could be understood in the wrong way.

I nether forget that men dived on Rebreather before diving OC and whe are not more clever than our "ancestor", nether forget than rather everything have been invented ( or thought ) at least two time.

Our community ( Rebreather World ) could perhaps avoid some of us to re invent the wheel too often ( Im included ).

Cheers all

Marc

paulraymaekers

Funny that so many people talk about flooding their units...

Can we have a poll: how many floods / 100 dives??

As far as I know, for the last +/- 1000 dives on the rEvo II beta serie, we had exactly 1 flood, where the diver had to go to bail-out (and yes, it was dirt in the OPV, probably sand or so..)

regards
paul

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Marc T

Yes paul THAT is the question I think whe are fighting most of the time aginst ghosts and overkill can kill us

heyydude

Hang on here, Marc:

First off - the Mark 15/16 have been in continuous use by the USN, RN, RAN, and many other Navies, since 1979. They don't have caustic cocktail incidents, and I know many of the depot level people that work with these things. So "worrying" about something that doesn't happen, or happens rarely in several thousand units over 27 years is like looking for fly shit in pepper.

Second, the Mark 15/15.5 are some of the EASIEST machines to maintain. They are easy because most of the components are standard Swagelok, are engineered to handle 3000 psi, even though they are subjected to an I.P. of 130 or so, and are more or less bullet proof.

(Note that I excluded the Mark 16 which uses custom Face Seal fittings and a custom Manual Add valve).

The reason Mark 15's intimidate some folks is that it looks like there is a lot going on inside the set - but once they have been trained (like in the Maintenance Course we give to people who buy a rig from us), they realize it's a snap.

You can't compare the Boris to a Mark 15 or 15.5. Kevin Gurr has a HUGE amount of experience on a 15.5, and built his own machine to deal with what he considered some failings of the series (one of which happens to be it's "unobtanium" qualities), NOT to duplicate it.

I've seen the Boris at several shows, and I think he did a hell of a job. It looks like a great machine, and it's done some stupendous dives on the backs of some very qualified divers - but saying that the number of caustic cocktail's reported on this list lately is no biggie because the 15/15.5 are the same is not a valid comparison, because cocktails on the 15/15.5/16 series are just not something that happnens much (if ever).

And in case anyone doubts where I stand, I still think that the Mark 16 is the finest rebreather ever built - bar none. So does the USN, the RN, and the RAN. Go figure.

Kevin Juergensen
Juergensen Marine, Inc.

iain-hsm

Kevin
Would you like to take this to the CCR MK forum and discuss further? This is way out of wack. The Mk 15 and for that matter the MK 16 is one of the worst performing rebreathers out there bar none. We can bang on and discuss performace, MTBF, or WOB breathing effort, you name it I dont mind.

Granted I dont think the dome material of the Ouroborus is suitable and if this were a demand valve or BC inflator we would be looking at a recall and replacement. The cold creep of the material will be an even greater problem in the future and I grant you the Mk15.5/16 had the problem nailed 1st time. But I do doubt these finest ever bar none claims.
There is still too much pepper in your fly shit my friend its blinding you

DrJM

ok guys lets clarify some points:

1) MIKE ???????? I thought the flooding last week of your unit was due to YOU using a modified spring (cut shorter) in the OPV, mainly with the new little larger upgraded OPV-back plate ???? therefore being a larger surface, it needed the original spring to push it in position (understand close). When I gave you the original small OPV-back plate it seems to work !

2) in more than 300h on Boris and a few deep dives on my no 002 unit I never had any flooding, but yes I take care of the unit, and yes I Virkon the counter lungs quite often, it's a breathing-life saving apparatus isn't it ???

3) I had my share of problems with the unit over the last 18 month but the factory solved them all, free of charge, what else can we ask for ?



As Howard Hall said about Rebreather:

“During my 1,000 hours of rebreather diving, the rather high frequency of equipment malfunction has only been exceeded by the much higher frequency of stupid diver mistakes”

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michael hearn

ithink paul is right here we concentrate to much on floods. recovery is possible even on an inspo, there are a lot of things to go wrong on an Rebreather.i think a lot of it is down to maintanence . i dont think a flood is pleasent to experience to go through but i dont think there is any design that will completely eliminate this problem what ever problem you have its usually experience that will solve it.
mike

decoweenie

Of course if the repairs are required due to manufacturing defects, then it is expected that the repairs are done FOC.

However did they pay for the shipping cost as well ?

I imagine if someone lives quite far away from UK, it would cost quite a bit having to ship parts back all the time for FOC repairs.

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SteveL

[quote=iain-hsm;70730]Kevin
Would you like to take this to the CCR MK forum and discuss further? This is way out of wack. The Mk 15 and for

Well its like this - a rolls royce is also considered the FINEST car on the market but you dont see adds for them on TV and they are not readilly discussed on car forums - as they are so damn good

The problem is that we dont have a MK series specific forum - we just get lumped in with "other rebreathers"

Maybe we could call it the big exotic balls forum


S