What is your greatest Rebreather fear?

***caveseeker7*** · 23rd June 2005, 16:47

And here I thought you just added your new greatest fear:
Getting rammed by Radomski on a 60m/min descent!

Quote: (Originally Posted by Mr. Greekbird)

This o ring/ seal is perhaps the most difficult to assess as any issues with all the others can be picked-up readily well before the dive.

A thorough pre-breathe is your best chance to pick it up.

Quote:

I've been using silicone grease for this as the o2 stuff goes all chalky and horrible. I believe this is acceptable as it is only in contact with low pressure o2. If anyone has any concerns to the contrary please advise.

More ambient than low pressure. That's SOP on PRISM, which needs a copious amount of silicone grease around the head/bucket connection.

***Decodiver*** · 23rd June 2005, 17:06

Quote: (Originally Posted by caveseeker7)

A thorough pre-breathe is your best chance to pick it up.

Hi Stefan,

I am not always sure it is. I wonder if it is possible to have scrubber bounce on the Inspiration like we used to have battery bounce?

(For those that are unaware of this issue it was when you hit the water, the battery contacts would bounce momentarily switching off the Inspiration, since corrected by APD).

ie as you jump off the boat, the scrubber cannister jumps within the scrubber case, on impact with the water and buckles a non-greased o-ring?

The only way to be sure of this not happening is to do a 10 minute breathe at say 6 metres before descending, I believe Dave Apperley does this as a matter of routine.

This is what I like about Rebreather World it gets you thinking, I'll be talking to my students about 'Scrubber Bounce' from now on.

Cheers,

Dave Cooper

***caveseeker7*** · 23rd June 2005, 17:18

Quote: (Originally Posted by Decodiver)

I am not always sure it is. I wonder if it is possible to have scrubber bounce on the Inspiration like we used to have battery bounce?

Dave, to be honest I don't know the Inspiration well enough.
Can't remember anyone mentioning dislogging the insert or O-ring that way.
Doing the pre-breathe on the surface or at the 6m bubble/systems check
would seem like a good idea to pick that up, though ...

jhaaja · 23rd June 2005, 20:23

I think it is possible to bounce the scrubber and get the o-ring jammed if it isn`t slippery enough. Best chances for that to happen is to jump from a distance to the water feet first so that the scrubber compresses at the impact against the spring and then bounces back.

JH
Finland

Drmike · 24th June 2005, 03:43

I never liked that o-ring. I think there are easier and safer ways to make that seal.

I know several divers who had CO2 problems due to it becoming dislodged or misplaced.

I much prefer captive o-rings, they are less likely to come dislodged and cant be misplaced.

When I first got it I toyed with the idea of modifying my YBOD to remove this problem.

See attached concept drawings - 1st one is mod to original, 2nd one is new lid mod. I never got around to doing either and dont suggest anyone modifies anything - just for discussion only

How is it done on the EVO?

23rd June 2005, 16:47	#51 (permalink)
*caveseeker7* Who loves ya, baby Current Rebreather/s: Sport Kiss Other Rebreather/s: Prism Topaz Join Date: Jan 2005 Location: Too far from Neverland Posts: 5,435	And here I thought you just added your new greatest fear: Getting rammed by Radomski on a 60m/min descent! Quote: (Originally Posted by Mr. Greekbird) This o ring/ seal is perhaps the most difficult to assess as any issues with all the others can be picked-up readily well before the dive. A thorough pre-breathe is your best chance to pick it up. Quote: I've been using silicone grease for this as the o2 stuff goes all chalky and horrible. I believe this is acceptable as it is only in contact with low pressure o2. If anyone has any concerns to the contrary please advise. More ambient than low pressure. That's SOP on PRISM, which needs a copious amount of silicone grease around the head/bucket connection. __________________ Cheers Stefan "Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.'!"
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23rd June 2005, 17:06	#52 (permalink)
*Decodiver* Administrator Current Rebreather/s: Megalodon Ouroboros rEvo Other CCR Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss rEvo Other CCR Join Date: Jan 2005 Location: Geneva Posts: 2,179	Quote: (Originally Posted by caveseeker7) A thorough pre-breathe is your best chance to pick it up. Hi Stefan, I am not always sure it is. I wonder if it is possible to have scrubber bounce on the Inspiration like we used to have battery bounce? (For those that are unaware of this issue it was when you hit the water, the battery contacts would bounce momentarily switching off the Inspiration, since corrected by APD). ie as you jump off the boat, the scrubber cannister jumps within the scrubber case, on impact with the water and buckles a non-greased o-ring? The only way to be sure of this not happening is to do a 10 minute breathe at say 6 metres before descending, I believe Dave Apperley does this as a matter of routine. This is what I like about Rebreather World it gets you thinking, I'll be talking to my students about 'Scrubber Bounce' from now on. Cheers, Dave Cooper __________________ CCR/OC Trimix Instructor Trainer CCR Training to Mixed Gas in Switzerland, France, UK & Germany on Megalodon/COPIS-Megalodon/KISS/Sport KISS/Ouroboros/rEvo/Inspiration/Evolution/Sentinel www.zerogravitydiving.com Rebreather World Terms & Conditions
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23rd June 2005, 17:18	#53 (permalink)
*caveseeker7* Who loves ya, baby Current Rebreather/s: Sport Kiss Other Rebreather/s: Prism Topaz Join Date: Jan 2005 Location: Too far from Neverland Posts: 5,435	Quote: (Originally Posted by Decodiver) I am not always sure it is. I wonder if it is possible to have scrubber bounce on the Inspiration like we used to have battery bounce? Dave, to be honest I don't know the Inspiration well enough. Can't remember anyone mentioning dislogging the insert or O-ring that way. Doing the pre-breathe on the surface or at the 6m bubble/systems check would seem like a good idea to pick that up, though ... __________________ Cheers Stefan "Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.'!"
(Offline)

23rd June 2005, 20:23	#54 (permalink)
jhaaja Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Mar 2005 Location: Finland Posts: 884	I think it is possible to bounce the scrubber and get the o-ring jammed if it isn`t slippery enough. Best chances for that to happen is to jump from a distance to the water feet first so that the scrubber compresses at the impact against the spring and then bounces back. JH Finland
(Online)

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