Canister O-Ring lub

James Appel · 5th August 2006, 20:05

I was watching shark week on TV today and noticed a diver setting up his Inspiration classic. He used his saliva to lubricate the O-Ring on his canister (the sliding O-Ring, not the compression one). I always use O2 grease as instructed, but was thinking that IF you were going to dive right away (I.E. not setting it up the night before), then this method might work just fine.

Regardless I will continue to use O2 grease (as I have lots, and a little bit go's forever), but was just wondering what everyone thought about this practice.

Recrebreather · 6th August 2006, 01:26

I have done that same thing in an emergency (forgot to lub3 o-ring before departure) and it worked fine for a day of diving.

RRB

abowie · 6th August 2006, 03:23

You could use anything you liked as at the end of the day the highest PO2 it's going to get exposed to is 1.3bar.

Personally though I avoid the use of anything that's not O2 compatible simply because if I put silicone grease (for argument's sake) on the scrubber and get it on my hands i could them contaminate the O2 reg with it, and i'd prefer not to.

Saliva's probably OK though.

colinicky · 6th August 2006, 17:26

Quote: (Originally Posted by abowie)

You could use anything you liked as at the end of the day the highest PO2 it's going to get exposed to is 1.3bar.

Yes but it could still be 100% O2 which I would have thought was more important than than the 1.3 bar ? also some people run 1.6 at deco .

diverrob · 6th August 2006, 18:07

Quote: (Originally Posted by colinicky)

Yes but it could still be 100% O2 which I would have thought was more important than than the 1.3 bar ? also some people run 1.6 at deco .

It is not so much the % of O2 that matters but the pressure behind the gas. The problem you run into with the O2 compatibility is because of compression ignition. For this to happen you need 3 things present. A high % of O2 usually 40% and higher, heat caused from compression of the gas and hydrocarbons/contamination. If you are dealing with LP gas then you don't have the potential energy to create the heat required to get combustion.

colinicky · 6th August 2006, 18:16

What do you consider LP ? I realise the pressure on ccr is considerable lower than OC but I've seen a normal OC reg catch fire inside when it was used with high % O2 .

jhaaja · 6th August 2006, 19:55

Quote: (Originally Posted by colinicky)

What do you consider LP ? I realise the pressure on ccr is considerable lower than OC but I've seen a normal OC reg catch fire inside when it was used with high % O2 .

Do you mean the 1st or 2nd stage?

I am not worried about LP (below 20bar) O2 but with HP O2 you have to be carefull.

JH

colinicky · 6th August 2006, 19:58

Quote: (Originally Posted by jhaaja)

Do you mean the 1st or 2nd stage?

I am not worried about LP (below 20bar) O2 but with HP O2 you have to be carefull.

JH

I am ! it was a 2nd stage

jhaaja · 6th August 2006, 20:12

Quote: (Originally Posted by colinicky)

I am ! it was a 2nd stage

I did not see it but can`t help to think it started from the 1st stage. It is basically impossible to make the heat needed to start a fire on LP side. I can be wrong also. Please tell more about that incident.

JH

colinicky · 6th August 2006, 20:22

I was shown the 2nd stage (Oceanic but can't remember model) after the dive & it was very clear that there had been a fire in it ( nice mess ) Once back on land we had the 1st stage checked for ip pressure etc & it was fine according to the shop ,we had my 1st stage checked as well & it was fine so the shops gauge was reasonable accurate .I couldn't understand & the shop said it was impossible but they also said the 2nd stage had definetly had a fire .The only explaination is that the 1st stage glitched for a moment but it never has since

5th August 2006, 20:05	#1 (permalink)
James Appel New Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Jan 2006 Location: Springfield, Oregon Posts: 60	Canister O-Ring lub I was watching shark week on TV today and noticed a diver setting up his Inspiration classic. He used his saliva to lubricate the O-Ring on his canister (the sliding O-Ring, not the compression one). I always use O2 grease as instructed, but was thinking that IF you were going to dive right away (I.E. not setting it up the night before), then this method might work just fine. Regardless I will continue to use O2 grease (as I have lots, and a little bit go's forever), but was just wondering what everyone thought about this practice.
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6th August 2006, 01:26	#2 (permalink)
Recrebreather Rebreathers Rock Current Rebreather/s: Inspiration Classic Optima Other CCR Dolphin Ray Azimuth Home Build Other Rebreather/s: Other CCR Dolphin Ray Azimuth Home Build Join Date: Feb 2005 Location: Seattle, WA Posts: 103	Re: Canister O-Ring lub I have done that same thing in an emergency (forgot to lub3 o-ring before departure) and it worked fine for a day of diving. RRB
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6th August 2006, 03:23	#3 (permalink)
abowie Fighting Girl Current Rebreather/s: Sport Kiss Other Rebreather/s: Join Date: May 2005 Location: Land of Oz Posts: 574	Re: Canister O-Ring lub You could use anything you liked as at the end of the day the highest PO2 it's going to get exposed to is 1.3bar. Personally though I avoid the use of anything that's not O2 compatible simply because if I put silicone grease (for argument's sake) on the scrubber and get it on my hands i could them contaminate the O2 reg with it, and i'd prefer not to. Saliva's probably OK though. __________________ Andrew Bowie Rebreather-friendly Buddy
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6th August 2006, 17:26	#4 (permalink)
colinicky RBW Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Mar 2005 Location: uk Posts: 682	Re: Canister O-Ring lub Quote: (Originally Posted by abowie) You could use anything you liked as at the end of the day the highest PO2 it's going to get exposed to is 1.3bar. Yes but it could still be 100% O2 which I would have thought was more important than than the 1.3 bar ? also some people run 1.6 at deco . __________________ Colin I trust my rebreather completely , I just don't trust the user onwards & downwards
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6th August 2006, 18:07	#5 (permalink)
diverrob The Evolution of Diving Current Rebreather/s: Evolution Other SCR Other Rebreather/s: Not Bought Yet Other SCR Join Date: May 2005 Location: Victoria BC Canada Posts: 349	Re: Canister O-Ring lub Quote: (Originally Posted by colinicky) Yes but it could still be 100% O2 which I would have thought was more important than than the 1.3 bar ? also some people run 1.6 at deco . It is not so much the % of O2 that matters but the pressure behind the gas. The problem you run into with the O2 compatibility is because of compression ignition. For this to happen you need 3 things present. A high % of O2 usually 40% and higher, heat caused from compression of the gas and hydrocarbons/contamination. If you are dealing with LP gas then you don't have the potential energy to create the heat required to get combustion.
(Online)

6th August 2006, 18:16	#6 (permalink)
colinicky RBW Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Mar 2005 Location: uk Posts: 682	Lp ? What do you consider LP ? I realise the pressure on ccr is considerable lower than OC but I've seen a normal OC reg catch fire inside when it was used with high % O2 . __________________ Colin I trust my rebreather completely , I just don't trust the user onwards & downwards
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6th August 2006, 19:55	#7 (permalink)
jhaaja Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Mar 2005 Location: Finland Posts: 885	Re: Lp ? Quote: (Originally Posted by colinicky) What do you consider LP ? I realise the pressure on ccr is considerable lower than OC but I've seen a normal OC reg catch fire inside when it was used with high % O2 . Do you mean the 1st or 2nd stage? I am not worried about LP (below 20bar) O2 but with HP O2 you have to be carefull. JH
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6th August 2006, 19:58	#8 (permalink)
colinicky RBW Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Mar 2005 Location: uk Posts: 682	Re: Lp ? Quote: (Originally Posted by jhaaja) Do you mean the 1st or 2nd stage? I am not worried about LP (below 20bar) O2 but with HP O2 you have to be carefull. JH I am ! it was a 2nd stage __________________ Colin I trust my rebreather completely , I just don't trust the user onwards & downwards
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6th August 2006, 20:12	#9 (permalink)
jhaaja Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Mar 2005 Location: Finland Posts: 885	Re: Lp ? Quote: (Originally Posted by colinicky) I am ! it was a 2nd stage I did not see it but can`t help to think it started from the 1st stage. It is basically impossible to make the heat needed to start a fire on LP side. I can be wrong also. Please tell more about that incident. JH
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6th August 2006, 20:22	#10 (permalink)
colinicky RBW Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Mar 2005 Location: uk Posts: 682	Re: Canister O-Ring lub I was shown the 2nd stage (Oceanic but can't remember model) after the dive & it was very clear that there had been a fire in it ( nice mess ) Once back on land we had the 1st stage checked for ip pressure etc & it was fine according to the shop ,we had my 1st stage checked as well & it was fine so the shops gauge was reasonable accurate .I couldn't understand & the shop said it was impossible but they also said the 2nd stage had definetly had a fire .The only explaination is that the 1st stage glitched for a moment but it never has since __________________ Colin I trust my rebreather completely , I just don't trust the user onwards & downwards
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