Pos. check on Optima

seafox · 31st January 2007, 02:35

Hey Mark,
Thanks for the update. I will order the 022 Viton 90 durometer when I run out.

Cornel

***jradomski*** · 31st January 2007, 10:14

Quote: (Originally Posted by Muzz)

Mark
You brought up a few good points. This might be a hijack.
First of all why is O2 lube used on Rebreather fitttings? Silicone works much better as a lube. Is it not safe to inhale or what? There isn't enough pressure for need of the O2 capability of the grease.
And second, your right about the over use of grease. If you can see it , it's too much. I rebuild regs for shops for a little extra cash in my spare time. You should see what happens when too much grease is used, it looks like glue.
Also I only use O2 grease if it needs it. silcone works better in most applications.

When used correctly with the proper o2 lubricant, o2 lube is a better lube (muchhigher lubricity rating than silicon).. Using an oxygen compatible also lubricant prevents potential cross contamination..

There are 2 types of o2 lubes mcg-111 and mcg-129..

MCG 129 should be used for general lubrication and especially with static seals (its thicker and has a greater viscosity), while mcg-111 should be used for dynamic lubrication such as the piston on a regulator.. The properties of the 2 lubricants are quite different..

If you look at reg manuals from manufacturers like scubapro, they recommend oxygen lube for all their products even if they are going to be used for air service since the regs have better performance with o2 lube..

n2diving · 31st January 2007, 13:00

I use oxygen compatible lube for everything because Fill Express does not have any other type of lube in the store as a matter of policy. Becuase so much of the equipment we handle is considered to be oxygen service (not always by me, mind you, but the people who brought it in to us claim it is) we don't want to take the risk of inadvertantly using a non-compatible lube. For the same reason, our stock o-rings are all Viton, we don't keep any nitrile in the store either.

I would be concerned about using silcone lube with the O2ptima... those special orange o-rings are, according to Micropore, not compatible with silicone lubes and their specific recommendation to me in a telephone conversation with Tom McKenna at Micropore was to lube them only with Christo-lube mcg-111. I suspect it doesn't really matter, especially since they are supposed to be replaced annually anyway... but I would have to go out of my way to use anything other than the recommended lube.

***ScubaDadMiami*** · 31st January 2007, 13:56

Quote: (Originally Posted by n2diving)

The 023 diameter was too large and would not stay in the groove and was so soft it would wrinkle too easily. The 90 duro is important, a standard Viton is 75 duro and nearly all nitriles are 70 duro, but I did some testing and discovered the harder slightly smaller o-ring worked much better. The thickness (first digit = 0) did not change.

Thanks for setting this information straight. I just assumed it was a larger or thicker o-ring.

So, are all of the o-rings on the hoses the same size as this?

31st January 2007, 02:35	#11 (permalink)
seafox 02ptima Instructor Current Rebreather/s: Inspiration Classic Optima Other Rebreather/s: Join Date: Mar 2005 Location: TORONTO, CANADA -Have "02ptima" will travel! Posts: 172	Re: Pos. check on Optima Hey Mark, Thanks for the update. I will order the 022 Viton 90 durometer when I run out. Cornel __________________ Protect the SHARKS! Excellence is never an accident; it is always the result of high intention, sincere effort, intelligent direction, skillful execution and the vision to see obstacles as opportunities. Experience is a hard teacher because she gives the test first, the lesson afterwards!
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31st January 2007, 10:14	#12 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 2,992	Re: Pos. check on Optima Quote: (Originally Posted by Muzz) Mark You brought up a few good points. This might be a hijack. First of all why is O2 lube used on Rebreather fitttings? Silicone works much better as a lube. Is it not safe to inhale or what? There isn't enough pressure for need of the O2 capability of the grease. And second, your right about the over use of grease. If you can see it , it's too much. I rebuild regs for shops for a little extra cash in my spare time. You should see what happens when too much grease is used, it looks like glue. Also I only use O2 grease if it needs it. silcone works better in most applications. When used correctly with the proper o2 lubricant, o2 lube is a better lube (muchhigher lubricity rating than silicon).. Using an oxygen compatible also lubricant prevents potential cross contamination.. There are 2 types of o2 lubes mcg-111 and mcg-129.. MCG 129 should be used for general lubrication and especially with static seals (its thicker and has a greater viscosity), while mcg-111 should be used for dynamic lubrication such as the piston on a regulator.. The properties of the 2 lubricants are quite different.. If you look at reg manuals from manufacturers like scubapro, they recommend oxygen lube for all their products even if they are going to be used for air service since the regs have better performance with o2 lube.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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31st January 2007, 13:00	#13 (permalink)
n2diving Custom Title Allowed! Current Rebreather/s: Optima Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Feb 2005 Location: Florida, USA Posts: 271	Re: Pos. check on Optima I use oxygen compatible lube for everything because Fill Express does not have any other type of lube in the store as a matter of policy. Becuase so much of the equipment we handle is considered to be oxygen service (not always by me, mind you, but the people who brought it in to us claim it is) we don't want to take the risk of inadvertantly using a non-compatible lube. For the same reason, our stock o-rings are all Viton, we don't keep any nitrile in the store either. I would be concerned about using silcone lube with the O2ptima... those special orange o-rings are, according to Micropore, not compatible with silicone lubes and their specific recommendation to me in a telephone conversation with Tom McKenna at Micropore was to lube them only with Christo-lube mcg-111. I suspect it doesn't really matter, especially since they are supposed to be replaced annually anyway... but I would have to go out of my way to use anything other than the recommended lube.
(Offline)

31st January 2007, 13:56	#14 (permalink)
*ScubaDadMiami* Moderator Current Rebreather/s: Optima Other Rebreather/s: Join Date: Sep 2005 Location: Florida, USA Posts: 2,136	Re: Pos. check on Optima Quote: (Originally Posted by n2diving) The 023 diameter was too large and would not stay in the groove and was so soft it would wrinkle too easily. The 90 duro is important, a standard Viton is 75 duro and nearly all nitriles are 70 duro, but I did some testing and discovered the harder slightly smaller o-ring worked much better. The thickness (first digit = 0) did not change. Thanks for setting this information straight. I just assumed it was a larger or thicker o-ring. So, are all of the o-rings on the hoses the same size as this? __________________ Howard Packer IANTD CCR Instructor Miami Beach, Florida CCRDiveTraining.com
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