[PSUBS-MAILIST] High Pressure Air System Thread Sealants

[Alan via Personal_Submersibles]

Noticed when visiting Nuytco that they used thread tape on their O2
supply to their bellows add system. Wondered about it at the time as I thought it would be inflammable. There is a high pressure gauge showing here so looks like they are using tape on the high pressure O2 line.
Alan



Sent from my iPad

> On 30/12/2017, at 2:34 PM, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Like Brian and Hank,
> Thread tape 2-1/2 turns and anti-seize. Don’t put on too much tape. Don’t leave tape hanging over the thread end as it will end up in the system.  Start about ½ a thread back.
> I tried Loctite many years ago with bad results but that was with natural gas.  We do high pressure gas for a living. White tape for air and yellow for gas.  Yellow is generally thicker.  Some cheap white tapes are really thin so compensate.
> https://northerncal.swagelok.com/blog/bid/88017/skill-applying-ptfe-tape-to-tapered-pipe-threads
>  
> Hugh
>  
> From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Brian Cox via Personal_Submersibles
> Sent: Saturday, 30 December 2017 1:57 PM
> To: Personal Submersibles General Discussion
> Subject: Re: [PSUBS-MAILIST] High Pressure Air System Thread Sealants
>  
> Steve,   I used just Teflon tape and I had some tiny leaks.  I would recommend using the Teflon tape and also a viscous product such as Never-seize.  I had to back everything out and re-do all my fittings just for piece of mind.  In addition the Never-seize is good for stainless to stainless fittings.  I didn't have any leaks after that.
>  
> Brian
>  
>  
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Steve McQueen via Personal_Submersibles <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] High Pressure Air System Thread Sealants
> Date: Sat, 30 Dec 2017 00:02:14 +0000 (UTC)
> 
> Steve,
> Tread tape has worked reliably for me for many years and projects.  I tried a liquid product one time and it was garbage.
> Hank
>  
> On Friday, December 29, 2017, 4:14:23 PM MST, Steve McQueen via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>  
>  
> All, I am starting to plumb together my K250 HP Air distribution system (3,500 psi). Looking for feedback.
> 
> For the NPT connections I am choosing a LOCTITE product:
> 
> 
> I’ve read Teflon tape technically isn’t the best for HP applications but I’ve seen it used.  Anyone have a proven best practice?
> 
> Thanks,
> 
> Steve
> 
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