[TheForge] Ice rink

[Bruce .]

GOD NO!  Never put ANYTHING which could POSSIBLY be a hydrocarbon or
other "fuel" source (such as grease, an O-ring, etc.) into an oxygen
system!  (Can you say, "bomb"?)

You MIGHT get away with Teflon because it's perfluorinated, but I
wouldn't bet my life on it -- which you just might be doing.

I think if I were desperate, I'd try polishing the fitting -- detached
from the regulator -- in hopes of eliminating whatever flaw was
preventing achieving a good seal.

Back some years, I used Western as a source of CGA fittings.  They
seem to still be in operation:
http://www.westernenterprises.com/enterprises/cga_fittings.php

On Sat, Nov 17, 2012 at 3:41 PM, Peter Fels & Phoebe Palmer
<artgawk at thegrid.net> wrote:
> Hi Paul:
> I favor those old Airco 2 stage regs too.
> Can you recommend a source for Regulator rebuild kits?
> I've been unable to get them locally for years  because of liability paranoia.
> While i generally agree about applying sealant to high pressure nipples, (especially oxygen fittings!!!)..
> I have , very carefully, had to use heavy teflon tape  on high pressure nipples to get a seal when the valve is beat up badly. Bad practice for sure. My gas supplier is an hour and 1/2 away and their maintenance department seems to be out to lunch.
> One has to be very careful that no teflon tape fragments get in the regulator intake and the battered seat and nipple is free of teflon when the bottle is empty. Never use any paste or liquid sealant that might flash under HP oxy!
> I see that newer propane nipples have inset "O"rings for seals. Would the same thing work for oxy with it's higher pressure demands?
>
> On Nov 17, 2012, at 9:19 AM, Paul Sperbeck wrote:
>
> If this happens with more than one tank, you need to repair the
> regulator. A damaged surface on the nipple can cause this, Inlet nipples
> are available. If that is not leaking you may have an internal problem.
> DO NOT APPLY TEFLON TAPE OR ANY SEALANT TO THE NIPPLE SURFACE OR THE
> NUT. If you are at all uncomfortable with the pressures involved I
> cannot recommend that you rebuild the regulator yourself.
>
> Repair parts typically will be around $50 wholesale to rebuild the
> regulator, expect to pay between $75 to $100 retail for the parts and
> possibly another $75 to do the rebuild.
>
> It may be cheaper just to replace the regulator. You might be able to
> purchase the regulator and re-use your flow meter depending on
> configuration.
>
> My favorite regulators are older Airco 2 stage units. They have been
> easy to obtain parts for, and have proved to be very reliable after the
> rebuild. I typically pay about $10 to $25 used at swap meets for
> regulators in need of a rebuild.
>
> paul
> WB9HCO
> --
> Try to notice the thing that happened just before the thing
> you didn't want to have happen happened!
>
> Resistance Is Not Futile!
> It's voltage divided by current.
>
> No trees were killed in the generation of this message,
>  but a tremendous number of electrons were terribly inconvenienced
>
>
>
> On 11/17/2012 08:45 AM, Suddenlink wrote:
>> FWIW. I thought All that was interesting.  & it applies to some of our shops. The ice rink disaster was caused by a refrigerant leak which displaced O2. I have a recurring problem w my inert gas regulators leaking small amts of gas where reg connects to tank. Not a danger for me as leaks r small & shop is large @ drafty. But in a close/tight space would/could be dangerous. We all think abt fuel gas & O2 leaks as dangerous (& they r) but other gasses displace O2.  Just as hazardous 2 u r health.
>> James
>>
>> Sent from my iPhone
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-- 
Bruce
NJ