[PSUBS-MAILIST] manifold

Thu Nov 12 02:56:00 EST 2015

Hi Brian,
I prefer to use brass for oxygen since it doesn't burn, whereas stainless
steel does.  But it's a bit overly paranoid since SS tube is widely used
with HP oxygen anyway, and so you have to use SS compression fittings with
it.  Plus you have to try really hard to get SS going.

If you use plenty of Teflon tape, say at least 4-5 turns (and make sure
it's suitable for oxygen, and none of it ends up in the flow path) the
galling risk of SS on SS new threads is very minimal.  Because NPT threads
seal on the sharp bit of the threads, they do get slightly more damaged
each time they are assembled, so avoid doing it more than necessary, and
don't tighten ridiculously hard.  That said, with plenty of Teflon tape you
can get away with at least 5 cycles.

It should go in and turn smoothly as you apply torque, if you feel it
getting jerky then that's time to think about stopping.  When they gall,
it's usually the male thread that's wrecked, so re-tapping the female
thread is an option in many cases.

Cheers,
Steve

On Thu, Nov 12, 2015 at 2:12 PM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Stephen,
>                  In your opinion would it be better for me to use a brass
> manifold if I were to be screwing ss fittings into it , because of the
> galling issue using stainless to stainless.  Or does it not matter that
> much it I use some type of anti galling compound?
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Stephen Fordyce via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] manifold
> Date: Wed, 11 Nov 2015 11:59:47 +1100
>
> Hi Brian and all,
>
> Western Enterprises (USA) does a nice and really cheap (~US$70?) 7-port
> (1/4" NPT) brass block rated to 3000PSI and idea for oxygen - see photo
> below - would be good if it's inside your sub.  They also do a SS version
> for several times the price.
>
> Global SCUBA Manufacturing makes most of the ones that Alec pointed out at
> Deep Six and they're pretty good too.  Being chrome plated brass they tend
> to be cheaper than SS, a bit nicer for oxygen service, and are still good
> for saltwater use.
>
> Both of those places only sell through distributors but you should be able
> to download catalogues (I can send if needed) so you can at least see
> what exists.
>
> I may have already mentioned (shameless plug), but I run a small
> business on the side which largely deals with custom assemblies and high
> pressure oxygen fittings, hoses, cylinder adaptors, etc. for SCUBA gas
> mixing and the like (and I'm a distributor for GSM and Western).  My
> catalogue is here:
> www.tfmengineering.com.au/TFM Engineering Catalogue 2015-10.pdf
> <http://www.tfmengineering.com.au/TFM%20Engineering%20Catalogue%202015-10.pdf>
>
> Much of my stock comes from the USA (to Australia) so it may not be very
> effective to ship it here and then back again, but if anyone is interested
> and has a few hundred USD worth of order I can probably arrange to get
> stuff sent direct from the factory instead.
>
> Cheers,
> Steve
>
> PS: What I wouldn't for access to McMaster Carr!  They don't ship to
> Australia :(
>
> [image: Inline image 1]
>
>
> On Wed, Nov 11, 2015 at 9:42 AM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Great !   Thanks everybody !
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] manifold
> Date: Tue, 10 Nov 2015 16:34:20 -0500
>
> Hi Brian,
>
> Call George at Deep Six Scuba. Here is the relevant page below, just
> scroll down and you'll see manifolds. BTW he's a super helpful guy, he's
> always fishing around and coming up with weird adapters and stuff for my
> unusual requests. Say hi!
>
> http://www.deep-six.com/page30.htm
>
>
> Best,
>
> Alec
>
> On Tue, Nov 10, 2015 at 1:31 PM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi All,
>                Does anyone know where I can get a stainless high pressure
> manifold that would be an off the shelf type item?  I will be needing to
> distribute HP air to various places ( not breathing air) , also will need
> ports for gages, probably at least 6 ports. I can always plug any port not
> it use.
>
> Brian
>
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