[PSUBS-MAILIST] High Pressure Air System Thread Sealants

[Stephen Fordyce via Personal_Submersibles]

Hi guys, common industry practice here in Australia is to use Teflon tape
for HP tapered thread connections, including for  HP oxygen (but using
oxygen clean tape). Using sealant alone I can tell you from personal
experience it's very hard to get a bubble-tight seal and stainless on
stainless threads will gall up more often than not. I use thin oxygen clean
tape from Western Enterprises (USA) and do 6-10 tight wraps.

Cheers,
Steve Fordyce

On 30 Dec 2017 3:05 pm, "Alan via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

> 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
>
> [image: image1.JPG]
>
> 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 <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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