Diluent selection and the great alpinist v siege debate

Janos · 31st December 2006, 08:41

Quote: (Originally Posted by Tino Corp.)

You are right, this is the only solution I see but I was taught not to switch off the O2 when there is no problem of the machine. And here this is only a bad diluant choice ...

I sort of agree. I would be very uncomfortable having my O2 switched off. I would probably spend those four minutes ignoring the wreck and doing nothing but staring at my displays until I could turn my O2 back on again!

Janos

**Dave Sutton** · 31st December 2006, 11:25

Quote: (Originally Posted by O.C.Diver)

While this thread has been quite interesting, Dave I feel you have overlooked a couple of points:

The Navy is prepared to accept losses, such is the nature of their business, most of our families are not!

While I am not a proponent of a 10% FO2 Dil, suggesting that a 1.8 PO2 is nothing to worry about on a loop flush for your average overweight, out of shape, 50+ diver who has no idea at what PO2 he really toxes at, is irresponsible. If you choose to do it, that's your decision. To tell others that they categorically won't have a problem regardless of their age, health, and tolerance to high POs, is totally different.

Personally I prefer an FO2 of 16%. Breathable for short periods on the surface, normoxic at 10', and not toxic for 99% of the dives most of us do.

Ted

First, as a pilot flying with Naval Aviation, I can tell you that your first statement is dead wrong... (pun intended).

Second, for the *time durations* am a discussing, there is no posssibility for any tox issue. Re-Read *again* the time durations we are talking about.... a few minutes when *accepted limits* for that same exposure is set forth in *hours*.

I know what I am writing may seem counterintuitive, but it's proven, and is well within any sensible limit. It's been done for years. And not to push the Navy, but within published Mark-15 depth limits, either air (21% obviously) or 80/20 Heliox are the only diluents that the military has *ever* used. The Mark-15's manual basically states that when the diver bottoms out, the high alarm will be illuminated. After a period of some minutes, the 02 will be consumed from the loop and the setpoint will be reached, upon which time the solenoid will begin to function. The manual basically states that you will REACH THE BOTTOM HOT and then will METABOLIZE THE 02 IN A FEW MINUTES and that this is NORMAL AND EXPECTED. Go read the book. They don't say more than that in the manuals because *no further discussion is warranted* because *the duration of exposure is so short as to be irrelevant*. And don't think for a minute that all Navy divers are fit and youthful. When these limits were established and tested, the average Chief Petty Officer/Master Diver was a 50 year old out of shape guy who had his right hand permanently deformed into a hook because it was rarely separated from his coffee cup. I grew up in the Navy, and spent a lot of time at EDU when I was working in the Ocean Simulation Facility. Trust me on this.... the research "subjects" weren't supermen. They were "Fleet Average". The Navy PT program has gotten lots better, but when the limites were established, the debate regarding smoking and a diver was "filtered or unfiltered" with Camel's being the divers choice as a smoke....

I REALLY appreciate your experience, and your excellent reputation, but I VERY respectfully believe that you are in the generation of "non-military trained, non commerical-diver trained" mixed gas divers who are of a group that was incorrectly taught (due to no fault other than that of their instructors) to fear *transient* (not sustained) PP02 spikes as though they were as dangerous as low PP02 conditions. Just ain't so. I think it' time for the industry to revisit this and to teach people the more complex "fuzzy" regarding high PP02 transition states as opposed to the "dumbed down" versions of simply avoiding them at all costs.

16% 02 is not going to help that overweight out of shape diver kick the last 20 feet to the ladder on the surface in a current after letting go of the tag-line and then to huff and puff his way up the ladder with all that crap he carries. It's the air/sea interface where divers struggle and sweat, and I'm gonna make sure my divers have GOOD GAS there. If I have a guy on a BOV kicking hard trying to make it to the back of my boat, breathing his diluent straight outta the bottle, I want that mix to be GOOD, not feeble.

And overweight, out of shape divers? They ought not to be doing technical rebreather diving anyhow... the best way for them to not tox is to take up riding the excercise bike for an hour a day...... no sympathy otherwise....

At least we agree that 10% is not best... ;-)

Dave

**Dave Sutton** · 31st December 2006, 11:35

Quote: (Originally Posted by Tino Corp.)

Hello Dave,

Can you please explain me how you would apply you method of lowering the PpO2 on a KISS system where there is a continuous flow Am I missing something (or is it just that I am still asleep)?

Yes, you're missing that on/off valve on the 02 bottle...... it turns ON. It turns OFF. Th cylinder is upside down so you can USE IT. So do!

I have a 90 degree ball valve right at the KISS valve on my KISS to make it easier. It's off on descent and until the loop is where I want it *if my dil is hot* (which normally it is NOT). Remember, that I am not suggesting that we deliberately MIX a hot diluent, but only that we use a normoxic one until we are FORCED to do otherwise. MOST of the diving you will likely do will be OK on a 21% dil while still allowing normal 02 flow on descent, It's only a small footprint of depths (especially on a KISS where it's depth limited anyway) where securing 02 flow on descent is a technique that should be considered.

With all due respect, and I mean this sincerely: There is a REAL PROBLEM in training if KISS Instructors are not teaching how to lower PP02 in event of some sort of high PP02 state being reached in a KISS, and with manual additions being the norm, and a mis-managed manual add being the normal way to overshoot desired PP02, this is a normal drill for the KISS diver trainee (or ought to be). I'm surprised that any KISS diver would be sent forth "trained" without the knowlage of this. Shame on the instructor, not the student.

I'm going to reiterate this once again: Use of low fraction 02 diluents *when not absolutely required* is a really dumb technique. If you have to because that's all the gas you have in micronesia, then we do what we need to do. But in the first world, where gas is available, there is NO REASON to do so. For a 500 foot dive? Do so! For a dive to 200 feet? It's DUMB. Use the right tool for the right job.

Dave

bletso · 31st December 2006, 11:56

Dave,

In the main, I agree with a lot of your thread. However my KISS style DOCCR was designed to do 100MSW, far deeper than I would want to to do 21% diluent O2, even for short periods.

I say this because I almost toxed once (sypmtoms of diaphramatic and facial twitches) with a PO2 of only about 2 for less than 10 mins.

You are also correct in pointing out that when you do have a problem and swith to SCC , you are on the move. A lot of the divers who monitor this forum don't know their individual tolerance levels on a good day let alone a bad one. Some of them would have a problem recognizing a problem early enough to impliment your approach safely.

I see problems with your approach, which in the hands of less experienced divers could quickly make a bad situation worse. You have to remember your experience level versus the main when promoting a different phylosophy.

I don't often disagree with most of what you say, but this this time I have to stradle the fence a little on the other side.

Dale

***EBT*** · 31st December 2006, 12:08

Quote: (Originally Posted by Dave Sutton)

There is a REAL PROBLEM in training if KISS Instructors are not teaching how to lower PP02 in event of some sort of high PP02 state being reached in a KISS

Its taught Dave. Dil flush, with your sensible choice of Dil (ie not superhot or superweak)

Quote: (Originally Posted by dave)

Use the right tool for the right job.

Agreed. Whatever it may be.

You simply wont see me diving hot dils, we fundamentally disagree that breathing a hot mix through choice is wise. I wont argue that superweak dils when not required arent optimal either.

Having said that, one of the benefits of a CCR is flexibility. I've tried to work on standard dils for depth ranges, but will quite often find myself running a 10/50 since its easy and gives shitloads of flexibility for channel wrecks. When we go away for caving weeks, we'll figure out our deepest cave and then mix a twinset of dil for that, decanting to drive the breathers for the whole week. At the end of the week, for the really shallow caves I'll dump the twinset and get it blown with something else to dive OC (since its less kit hassle/risk).

Optimal tools for the job is the point we're both making. Theres more than one way to skin a cat though and this thread shows that quite nicely. See, all civilised (and not once did I stoop to taking the piss out of "grits"... who eats that stuff!?)

Right. Im offski anyway, new years beckons and I need to calculate my optimal inebriation mix and ensure a bailout supply of american beer for when the real stuff gets too much

menofall · 31st December 2006, 14:04

Quote: (Originally Posted by bletso)

Dave,

In the main, I agree with a lot of your thread. However my KISS style DOCCR was designed to do 100MSW, far deeper than I would want to to do 21% diluent O2, even for short periods.

I say this because I almost toxed once (sypmtoms of diaphramatic and facial twitches) with a PO2 of only about 2 for less than 10 mins.

You are also correct in pointing out that when you do have a problem and swith to SCC , you are on the move. A lot of the divers who monitor this forum don't know their individual tolerance levels on a good day let alone a bad one. Some of them would have a problem recognizing a problem early enough to impliment your approach safely.

I see problems with your approach, which in the hands of less experienced divers could quickly make a bad situation worse. You have to remember your experience level versus the main when promoting a different phylosophy.

I don't often disagree with most of what you say, but this this time I have to stradle the fence a little on the other side.

Dale

hey Dale, am interested in your toxing at 2. for less than ten mins, I also like dave hit the bottom semi-hot sometimes 1.6-1.8 shut off the valve at my hydrogom, metabolize it down (few mins) turn back on the constant flow and continue diving, in your situation, were you stuck at 2. for however long, could you give more details, and what you did to fix the problem, very interested, because you dive a kiss style like myself. thanx.

SteveL · 31st December 2006, 14:20

Quote: (Originally Posted by Dave Sutton)

All I can say is "agreed on ALL points", I use the Cooper hoses too, and Col's stuff is magic. The HUD will be done soon. Fight you for the first one.

Dave

Dave my man just back from NYE pipss up and a bottly of single malt laeter ...... I agree mate on all thie things you are sahying - oh crap Im pissed -- badly - big mistake leaving computer on n

HAPPY NEW YEAR

By the way regards cols HUD - Ill see you out the back of the shed at sundown

-Ive already seen it stick em up duke

crap - I xant see the keys - I better stop and loog post in the morning verey very very late

happy new yerar

S

bletso · 31st December 2006, 16:47

Quote: (Originally Posted by menofall)

hey Dale, am interested in your toxing at 2. for less than ten mins, I also like dave hit the bottom semi-hot sometimes 1.6-1.8 shut off the valve at my hydrogom, metabolize it down (few mins) turn back on the constant flow and continue diving, in your situation, were you stuck at 2. for however long, could you give more details, and what you did to fix the problem, very interested, because you dive a kiss style like myself. thanx.

It was on OC a few years back, diving what I thought was ean36 at 110ffw (33MFW) in pea soup.. However there was a long, hot suface swim to the drop point, then a plunge into 7C water with my normal fast drop. A couple of minutes later.... So, I just came up to a shollower depth and slowed down until everything cooled down and the offgas effect was clear.

Later on the surface, I analyzed my mix. It was closer to 50. (This was before I got into rebreathers) I can guarantee you, I check my mixes all the time since. A lot of things were wrong that day. That kind of mix should never been in that bottle, probably an error mixing. But, all's well that ends well. I learned a very good lesson.

I have never had that kind of problem on MCCR. I did have some issues awhile back when I noticed my PO2 climbing up substantially due to IP creep. At that time I just turned off the O2 until it dropped. I did not abort the dive, just had to monitor things more often. It did take sometime to figure out the exact cause. (I ran with an IP gauge untill the culprit showed itself again. It was intermitent.)

Dale

rdmmdr · 31st December 2006, 20:10

bletso

i assume that you ment 110ft.
rick

bletso · 31st December 2006, 20:47

Yep, I corrected it. I normally use metric and trip myself up from time to time.

Dale

31st December 2006, 08:41	#31 (permalink)
Janos "Two Sheds" Current Rebreather/s: Classic Kiss Other Rebreather/s: Classic Kiss Join Date: Feb 2005 Location: East Surrey Posts: 599	Re: Diluent selection and the great alpinist v siege debate Quote: (Originally Posted by Tino Corp.) You are right, this is the only solution I see but I was taught not to switch off the O2 when there is no problem of the machine. And here this is only a bad diluant choice ... I sort of agree. I would be very uncomfortable having my O2 switched off. I would probably spend those four minutes ignoring the wreck and doing nothing but staring at my displays until I could turn my O2 back on again! Janos __________________ You can lead a horse to water but you can't climb a ladder with a large bell in both hands - Vic Reeves www.hellfins.com/shed
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31st December 2006, 11:25	#32 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,672	Re: Diluent selection and the great alpinist v siege debate Quote: (Originally Posted by O.C.Diver) While this thread has been quite interesting, Dave I feel you have overlooked a couple of points: The Navy is prepared to accept losses, such is the nature of their business, most of our families are not! While I am not a proponent of a 10% FO2 Dil, suggesting that a 1.8 PO2 is nothing to worry about on a loop flush for your average overweight, out of shape, 50+ diver who has no idea at what PO2 he really toxes at, is irresponsible. If you choose to do it, that's your decision. To tell others that they categorically won't have a problem regardless of their age, health, and tolerance to high POs, is totally different. Personally I prefer an FO2 of 16%. Breathable for short periods on the surface, normoxic at 10', and not toxic for 99% of the dives most of us do. Ted First, as a pilot flying with Naval Aviation, I can tell you that your first statement is dead wrong... (pun intended). Second, for the time durations am a discussing, there is no posssibility for any tox issue. Re-Read again the time durations we are talking about.... a few minutes when accepted limits for that same exposure is set forth in hours. I know what I am writing may seem counterintuitive, but it's proven, and is well within any sensible limit. It's been done for years. And not to push the Navy, but within published Mark-15 depth limits, either air (21% obviously) or 80/20 Heliox are the only diluents that the military has ever used. The Mark-15's manual basically states that when the diver bottoms out, the high alarm will be illuminated. After a period of some minutes, the 02 will be consumed from the loop and the setpoint will be reached, upon which time the solenoid will begin to function. The manual basically states that you will REACH THE BOTTOM HOT and then will METABOLIZE THE 02 IN A FEW MINUTES and that this is NORMAL AND EXPECTED. Go read the book. They don't say more than that in the manuals because no further discussion is warranted because the duration of exposure is so short as to be irrelevant. And don't think for a minute that all Navy divers are fit and youthful. When these limits were established and tested, the average Chief Petty Officer/Master Diver was a 50 year old out of shape guy who had his right hand permanently deformed into a hook because it was rarely separated from his coffee cup. I grew up in the Navy, and spent a lot of time at EDU when I was working in the Ocean Simulation Facility. Trust me on this.... the research "subjects" weren't supermen. They were "Fleet Average". The Navy PT program has gotten lots better, but when the limites were established, the debate regarding smoking and a diver was "filtered or unfiltered" with Camel's being the divers choice as a smoke.... I REALLY appreciate your experience, and your excellent reputation, but I VERY respectfully believe that you are in the generation of "non-military trained, non commerical-diver trained" mixed gas divers who are of a group that was incorrectly taught (due to no fault other than that of their instructors) to fear transient (not sustained) PP02 spikes as though they were as dangerous as low PP02 conditions. Just ain't so. I think it' time for the industry to revisit this and to teach people the more complex "fuzzy" regarding high PP02 transition states as opposed to the "dumbed down" versions of simply avoiding them at all costs. 16% 02 is not going to help that overweight out of shape diver kick the last 20 feet to the ladder on the surface in a current after letting go of the tag-line and then to huff and puff his way up the ladder with all that crap he carries. It's the air/sea interface where divers struggle and sweat, and I'm gonna make sure my divers have GOOD GAS there. If I have a guy on a BOV kicking hard trying to make it to the back of my boat, breathing his diluent straight outta the bottle, I want that mix to be GOOD, not feeble. And overweight, out of shape divers? They ought not to be doing technical rebreather diving anyhow... the best way for them to not tox is to take up riding the excercise bike for an hour a day...... no sympathy otherwise.... At least we agree that 10% is not best... ;-) Dave __________________ "Changes in Lattitudes, Changes in Attitudes, Nothing remains quite the same".... www.nobubblediving.com Last edited by Dave Sutton : 31st December 2006 at 12:00.
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31st December 2006, 11:35	#33 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,672	Re: Diluent selection and the great alpinist v siege debate Quote: (Originally Posted by Tino Corp.) Hello Dave, Can you please explain me how you would apply you method of lowering the PpO2 on a KISS system where there is a continuous flow Am I missing something (or is it just that I am still asleep)? Yes, you're missing that on/off valve on the 02 bottle...... it turns ON. It turns OFF. Th cylinder is upside down so you can USE IT. So do! I have a 90 degree ball valve right at the KISS valve on my KISS to make it easier. It's off on descent and until the loop is where I want it if my dil is hot (which normally it is NOT). Remember, that I am not suggesting that we deliberately MIX a hot diluent, but only that we use a normoxic one until we are FORCED to do otherwise. MOST of the diving you will likely do will be OK on a 21% dil while still allowing normal 02 flow on descent, It's only a small footprint of depths (especially on a KISS where it's depth limited anyway) where securing 02 flow on descent is a technique that should be considered. With all due respect, and I mean this sincerely: There is a REAL PROBLEM in training if KISS Instructors are not teaching how to lower PP02 in event of some sort of high PP02 state being reached in a KISS, and with manual additions being the norm, and a mis-managed manual add being the normal way to overshoot desired PP02, this is a normal drill for the KISS diver trainee (or ought to be). I'm surprised that any KISS diver would be sent forth "trained" without the knowlage of this. Shame on the instructor, not the student. I'm going to reiterate this once again: Use of low fraction 02 diluents when not absolutely required is a really dumb technique. If you have to because that's all the gas you have in micronesia, then we do what we need to do. But in the first world, where gas is available, there is NO REASON to do so. For a 500 foot dive? Do so! For a dive to 200 feet? It's DUMB. Use the right tool for the right job. Dave __________________ "Changes in Lattitudes, Changes in Attitudes, Nothing remains quite the same".... www.nobubblediving.com Last edited by Dave Sutton : 31st December 2006 at 11:43.
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31st December 2006, 11:56	#34 (permalink)
bletso An independent diver. Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: May 2006 Location: Louisville, KY, USA Posts: 256	Re: Diluent selection and the great alpinist v siege debate Dave, In the main, I agree with a lot of your thread. However my KISS style DOCCR was designed to do 100MSW, far deeper than I would want to to do 21% diluent O2, even for short periods. I say this because I almost toxed once (sypmtoms of diaphramatic and facial twitches) with a PO2 of only about 2 for less than 10 mins. You are also correct in pointing out that when you do have a problem and swith to SCC , you are on the move. A lot of the divers who monitor this forum don't know their individual tolerance levels on a good day let alone a bad one. Some of them would have a problem recognizing a problem early enough to impliment your approach safely. I see problems with your approach, which in the hands of less experienced divers could quickly make a bad situation worse. You have to remember your experience level versus the main when promoting a different phylosophy. I don't often disagree with most of what you say, but this this time I have to stradle the fence a little on the other side. Dale
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31st December 2006, 12:08	#35 (permalink)
*EBT* Apprentice Luddite Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: UK, Brighton Posts: 1,970	Re: Diluent selection and the great alpinist v siege debate Quote: (Originally Posted by Dave Sutton) There is a REAL PROBLEM in training if KISS Instructors are not teaching how to lower PP02 in event of some sort of high PP02 state being reached in a KISS Its taught Dave. Dil flush, with your sensible choice of Dil (ie not superhot or superweak) Quote: (Originally Posted by dave) Use the right tool for the right job. Agreed. Whatever it may be. You simply wont see me diving hot dils, we fundamentally disagree that breathing a hot mix through choice is wise. I wont argue that superweak dils when not required arent optimal either. Having said that, one of the benefits of a CCR is flexibility. I've tried to work on standard dils for depth ranges, but will quite often find myself running a 10/50 since its easy and gives shitloads of flexibility for channel wrecks. When we go away for caving weeks, we'll figure out our deepest cave and then mix a twinset of dil for that, decanting to drive the breathers for the whole week. At the end of the week, for the really shallow caves I'll dump the twinset and get it blown with something else to dive OC (since its less kit hassle/risk). Optimal tools for the job is the point we're both making. Theres more than one way to skin a cat though and this thread shows that quite nicely. See, all civilised (and not once did I stoop to taking the piss out of "grits"... who eats that stuff!?) Right. Im offski anyway, new years beckons and I need to calculate my optimal inebriation mix and ensure a bailout supply of american beer for when the real stuff gets too much __________________ Eagles May Soar, but weasels don't get sucked into jet engines! Rebreather World Terms of service Real diving t-shirts for real divers
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31st December 2006, 14:04	#36 (permalink)
menofall New Member Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Dec 2006 Location: US Posts: 22	Re: Diluent selection and the great alpinist v siege debate Quote: (Originally Posted by bletso) Dave, In the main, I agree with a lot of your thread. However my KISS style DOCCR was designed to do 100MSW, far deeper than I would want to to do 21% diluent O2, even for short periods. I say this because I almost toxed once (sypmtoms of diaphramatic and facial twitches) with a PO2 of only about 2 for less than 10 mins. You are also correct in pointing out that when you do have a problem and swith to SCC , you are on the move. A lot of the divers who monitor this forum don't know their individual tolerance levels on a good day let alone a bad one. Some of them would have a problem recognizing a problem early enough to impliment your approach safely. I see problems with your approach, which in the hands of less experienced divers could quickly make a bad situation worse. You have to remember your experience level versus the main when promoting a different phylosophy. I don't often disagree with most of what you say, but this this time I have to stradle the fence a little on the other side. Dale hey Dale, am interested in your toxing at 2. for less than ten mins, I also like dave hit the bottom semi-hot sometimes 1.6-1.8 shut off the valve at my hydrogom, metabolize it down (few mins) turn back on the constant flow and continue diving, in your situation, were you stuck at 2. for however long, could you give more details, and what you did to fix the problem, very interested, because you dive a kiss style like myself. thanx.
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31st December 2006, 14:20	#37 (permalink)
SteveL Custom Title Allowed! Current Rebreather/s: MK 15.X Other Rebreather/s: Inspiration Classic Join Date: Nov 2005 Location: Sydney Australia Posts: 222	Re: Diluent selection and the great alpinist v siege debate Quote: (Originally Posted by Dave Sutton) All I can say is "agreed on ALL points", I use the Cooper hoses too, and Col's stuff is magic. The HUD will be done soon. Fight you for the first one. Dave Dave my man just back from NYE pipss up and a bottly of single malt laeter ...... I agree mate on all thie things you are sahying - oh crap Im pissed -- badly - big mistake leaving computer on n HAPPY NEW YEAR By the way regards cols HUD - Ill see you out the back of the shed at sundown -Ive already seen it stick em up duke crap - I xant see the keys - I better stop and loog post in the morning verey very very late happy new yerar S
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31st December 2006, 16:47	#38 (permalink)
bletso An independent diver. Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: May 2006 Location: Louisville, KY, USA Posts: 256	Re: Diluent selection and the great alpinist v siege debate Quote: (Originally Posted by menofall) hey Dale, am interested in your toxing at 2. for less than ten mins, I also like dave hit the bottom semi-hot sometimes 1.6-1.8 shut off the valve at my hydrogom, metabolize it down (few mins) turn back on the constant flow and continue diving, in your situation, were you stuck at 2. for however long, could you give more details, and what you did to fix the problem, very interested, because you dive a kiss style like myself. thanx. It was on OC a few years back, diving what I thought was ean36 at 110ffw (33MFW) in pea soup.. However there was a long, hot suface swim to the drop point, then a plunge into 7C water with my normal fast drop. A couple of minutes later.... So, I just came up to a shollower depth and slowed down until everything cooled down and the offgas effect was clear. Later on the surface, I analyzed my mix. It was closer to 50. (This was before I got into rebreathers) I can guarantee you, I check my mixes all the time since. A lot of things were wrong that day. That kind of mix should never been in that bottle, probably an error mixing. But, all's well that ends well. I learned a very good lesson. I have never had that kind of problem on MCCR. I did have some issues awhile back when I noticed my PO2 climbing up substantially due to IP creep. At that time I just turned off the O2 until it dropped. I did not abort the dive, just had to monitor things more often. It did take sometime to figure out the exact cause. (I ran with an IP gauge untill the culprit showed itself again. It was intermitent.) Dale Last edited by bletso : 31st December 2006 at 20:46.
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31st December 2006, 20:10	#39 (permalink)
rdmmdr designer of death Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Mar 2006 Location: kerman,california Posts: 372	Re: Diluent selection and the great alpinist v siege debate bletso i assume that you ment 110ft. rick
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31st December 2006, 20:47	#40 (permalink)
bletso An independent diver. Current Rebreather/s: Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: May 2006 Location: Louisville, KY, USA Posts: 256	Re: Diluent selection and the great alpinist v siege debate Yep, I corrected it. I normally use metric and trip myself up from time to time. Dale
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