reg recommendation for high O2

[Dr T]

Originally Posted by jonny

Scubapro Mk2+, ideally it should be O2 cleaned before use with >40% as there are some O rings that are not ideal with regards to O2 compatibility.

ooooo. are there ?? apart from a fire what might happen ??

i am using MK2 and r390s on my 36% and 75% and they ahven't been o2 cleaned


ash

[Dick Barwell]

I worked in industry at one time and boxes of O rings all had the same physical size and appearance but the spec and material were the aspect that caused the sh*t to hit the fan when the item was wrongly fitted
Different gases and different effects

So the o ring thing.... high O2 apparently causes a breakdown in the material over use although initially it appears to have little effect.
I did read in one of the service manuals that high O2 can cause some O ring's to give off toxic fumes as they break up.(not nice) I think it was an POSIEDON (one but don't quote me)
There are so many specs on materials out there I would leave it to the experts provide the proper materials to O2 clean the regs etc and not take the risk (With all diving it appears as a calculated one anyway ?)

Just a personal veiw and I am no expert.
db

[chrisch]

Originally Posted by Dick Barwell

...I would leave it to the experts provide the proper materials to O2 clean the regs etc and not take the risk ...

Me too. Keep it well away from your LDS...

Chris

[gibbon]

Originally Posted by Dr T

ooooo. are there ?? apart from a fire what might happen ??

i am using MK2 and r390s on my 36% and 75% and they ahven't been o2 cleaned


ash

You are spot on I cant think of anything that might happen other than a fire or perhaps just a bit of flashing rather than a full blown deflagration!

The reason I made that comment is that SP do not recommend the Mk2+ for O2 use, yet it is pretty much ready to go and quite ideal and used by many people.

It must be so great not to be frightened by O2, to be bigger, stronger, tougher, not afraid of the invisible, tasteless odorless killer - oh wait a minute thats just stupid and could lead to someones death.

What is it with boasting about not beliving in O2 cleaning? If YD were simply a place of education for divers then it would have to be moderated more - and I suspect that one of the rules of moderation would be that posts saying that O2 cleaning was not required would be deleted.

Perhaps you and others would be so kind as to state clearly why you decide not to O2 clean your regs so that the rest of us can understand the basis on which you make your decision?

Perhaps after all we are just wasting time, effort and money and you are correct?

[Dr T]

can't speak for others, but on my behalf it is mostly pure lazyness.

I use the regs nearly every weekend so finding time to drive the hr and half to the dive shop and leave them there for a week is a bit of a pain.

Also in three years of using high o2 %s, never had a problem so why take them apart and tinker when they are working fine

.....but thats just me.

Saying that this thread has sparked me into action and after our boat trip at the weekend, they will be in for a full service and o2 clean

ta for the info and advice chaps

ash

[Proteusdiver]

Well, I know a guy or two who also thought that they could dive the profiles they did since they were used to air at 70meters and did not have been "bent"... Guess what... One is on a wheelchair for the rest of his (now) miserable life, the other was (eventually) found at 65 meters after a weeks search...
An oxygen induced fire is not something that happens everyday, when it does though...
I usually prefer to use OTHER people's bad experiences on what NOT to do...
My view is that one cannot be "conservative" enough using O2 under pressure...
I keep hearing of incidents happening under conditions that I used to think were "safe" concerning O2 equipment and handling.
Stelios

[Peter M]

Asked this a while back but my LDS had the final say when i saked for a 50% fill and they asked to see the reg being used, not correct reg, no fill, this wasn't a marketing ploy either!!

[IanRMartin]

Can a normal Reg which is OK upto 40% out the box (Poseidon Jetstream) be cleaned for use with 100% O2?
If not 100% what is the upper limit?

[chrisch]

Originally Posted by IanRMartin

Can a normal Reg which is OK upto 40% out the box (Poseidon Jetstream) be cleaned for use with 100% O2?
If not 100% what is the upper limit?

Its up to the manufacturer (sorry not sure about the jetstreams - someone that uses them will tell you soon)

Most regs are OK for O2 but the manufacturers have got increasingly wary about saying so of late. Some even say only 21% out the box...

Half of it is marketing bulshit half of it insurance related.

The problem is that If you ignore their BS and anything goes wrong you are stuffed.

What you are looking for is O2 compatability which then allows cleaning to get O2 service. O2 compatability is about being made with the right materials - hence its the manufacturers' call....

How far you are prepared to stretch things will depend on your personal risk tollerance, your belief in the manufacturers and the scuba industry and whether or not you are diving for fun or for money. If you are a professional instructor its not worth the risk IMHO.

My deco regs are an Oceanic Alpha and a Scubapro Mk2 with Oceanic 2nd FWIW.

Chris

[Freeflow]

Originally Posted by IanRMartin

Can a normal Reg which is OK upto 40% out the box (Poseidon Jetstream) be cleaned for use with 100% O2?
If not 100% what is the upper limit?

Some Atomics can only be used with up to 80%, but unless you are RB diving then 80% is a bit more flexible than 100% for a deco gas anyway [you can get on it at 9m and at 6m you have a lower pO2 for a negligee effect on your deco time-for most diving].

I think the rest can be cleaned for 104% O2 with no problem .