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A little Simple Green, hot water, and common sense. Scott ----- Original Message ----- From: Duane Liptak Jr <d.liptak.jr@wo*.at*.ne*> To: <techdiver@aquanaut.com> Sent: Monday, October 23, 2000 6:33 PM Subject: oxygen cleaning > Can someone out there give me the straight scoop on O2 cleaning? Every gear > manufacturer and agency seems to have different regulations and standards > ranging from cautious to downright paranoid, and I'm getting frustrated as > hell trying to sort it all out. > > My specific areas of concern are: > > 1. What exactly needs to be done to a regulator to make it safe for > mixtures of 40% to 100%? (Beyond the tear it down and clean everything with > simple green, trichloroethane, or other solvent part.) > > a. Does every O-ring need to be viton, just high pressure side, or are > nitrile/butyl o-rings acceptable? I know that many aviation applications > use nitrile, but viton seems to be mandated for scuba uses. What's the > deal? > > b. What needs to be done with hoses, especially HP? ( clean them, use > new hoses rated for O2 service, etc.) > > c. SPG's: Should they be cleaned, and how? Do the spool O-rings need > to be changed? > > d. Second stages: Do the O-ring, diaphragm, and seat materials matter > at the lower pressures that this system is exposed to? How about lube? > > e. Are Sherwood regs (with the rubber dry air bleed valve) acceptable > for use with high FO2's? (academic question--I use Zeagles) > > 2. Tank valves: Do quick opening valves, like some Genesis K's with coarse > threads on the seat, pose a danger with high FO2's? > > Any help from those with more experience in this are would be greatly > appreciated. I have used and been around HP O2 in welding and cutting > industrial applications for years, and despite some abhorrent conditions of > uncleanliness and regulator (welding type) abuse that I have been > unfortunate enough to witness, I have not seen or heard of any documented > accidents besides the " My brother's wife's friend's brother knew a guy who > heard of somebody...." type. It makes me wonder how much of this is > actually necessary and how much is scare tactics to get divers to buy viton > everything. > Don't get me wrong, I've been pretty cautious up to now with the mixes > under 40% that I have used, but I'm just curious as to how much of this is > necessary, and how the folks out there who have the experience are doing > things. > > Thanks in advance, > > Duane > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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