[TheForge] Ice rink

[Peter Fels & Phoebe Palmer]

Goodness!
OK!! Never again, and Thank you too Jim!
I'd seen it used and assumed it was OK....Wrong.
Thank you both for setting me straight!...Well, straighter anyway.

On Nov 17, 2012, at 5:14 PM, James Binnion wrote:

Pete,
Dont do it. Teflon will burn under HP oxy in the right situation not as easy as other hydrocarbons but it will burn. I have read the accident report on a HP O2 pigtail with a teflon liner burning when a ball valve was put into a HP O2 manifold by some fool and operating the valve applied 3500 psi O2 in to the pigtail in an instant. I know your problem with the 1 and a half hour drive to the gas supplier but...  

On Nov 17, 2012, at 12:41 PM, Peter Fels & Phoebe Palmer 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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James Binnion
jbin at well.com



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