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- Path: sparky!uunet!noc.near.net!transfer.stratus.com!gehenna.sw.stratus.com!gd
- From: gd@gehenna.sw.stratus.com (Greg Dawe)
- Newsgroups: rec.scuba
- Subject: Re: Nitrox Diving
- Date: 22 Dec 1992 14:43:53 GMT
- Organization: Stratus Computer, Software Engineering
- Lines: 37
- Message-ID: <1h79j9INNcb6@transfer.stratus.com>
- References: <1992Dec11.173748.15773@u.washington.edu> <1h4jmuINNeus@transfer.stratus.com> <1992Dec21.203228.4061@atux01.att.com>
- NNTP-Posting-Host: gehenna.sw.stratus.com
-
- In article <1992Dec21.203228.4061@atux01.att.com> graff@atux01.att.com (Christopher Graff) writes:
- > Ok I received a bit more information from the shop.
- > The Viton rings are silicon o-rings except that there lubricated
- > with a chemical called Critox (Unsure of spelling) instead of silicone
- > grease. This prevents
- > corrosion and combustability with pure O2. They are replaced once
- > a year. They are installed in 1st stage and tanks. Most mixes of
- > Nitrox are usually under the 40% figure so you dont have to worry
- > about the clean equipment fear that much. There is more to the cleaning
- > of equipment in hoses and tanks but I didnt have time to get into a
- > lengthy discussion about Nitrox. When I have more news Ill let you
- > know. The service is about $50.
- >
- Well, silicone O-rings are O2 compatible, but they're more expensive than
- viton. Critox (sp?) is an O2 compatible lubricant.
-
- I'm not sure, but it sounds like the $50 includes the O-rings, cleaning of
- the reg plus O-ring installation, cleaning of the tank, cleaning of the
- valve plus O-ring installation. If so, that sounds like an excellent price.
- If I were charging for those services it would probably be over $100.
-
- Depending on what you're doing with your regulator you might want to have it
- checked every 6 months, especially if it's being used with pure O2.
-
- When I attended a class for cleaning O2 equipment the instructor told us
- about a training film he had seen (it was a proprietary film, so he couldn't
- get it to show us). The film showed a segment of HP piping used to carry
- O2. The piping had a right angle bend in it, and atop the bend was a valve.
- The experimentors injected a single aluminum flake into the gas stream. When
- the flake hit the right angle bend, it caused a spark, which caused an
- explosion, which vaporized the valve atop the bend. Just the telling of that
- story, without even having seen the film, gave me a healthy dose of respect
- for HP O2 and the care that must go into cleaning/servicing O2 systems.
- --
- Greg Dawe | Disclaimer: I don't speak for my employer,
- Voice : (508)-490-6666 | nor they for me...
- e-mail: Greg_Dawe@vos.stratus.com|
-