[PSUBS-MAILIST] penetration schedule

Fri Aug 14 16:29:22 EDT 2015

Have to check, I thought Teflon tape was OK. But you have to use only
needle valves not ball valves, only special grease, O2 compatible O rings
lubricants, etc. I would normally only use Swagelok type compression
fittings anyway, whether its O2 or anything else.

On Fri, Aug 14, 2015 at 4:20 PM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alec,
>             So the other issue is that you don't want to use any pipe dope
> or Teflon tape in your system which could be a source of fuel.  So getting
> from point A to point B if your O2 tank is outside has to be done with just
> compression fittings?
>
> 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] penetration schedule
> Date: Fri, 14 Aug 2015 16:03:49 -0400
>
> I believe the point is that brass/bronze/copper is less likely to ignite
> than SS, so they avoid using SS for piping in the O2. Plus, you need to
> clean everything so the fact its removable facilitates cleaning. Having
> said that, on Snoopy it all goes through SS -- but there's a regulator
> directly on the tank so I'm only dealing with low pressure O2. It is the
> high pressure lines that are most critical.
>
> Alec
>
> On Fri, Aug 14, 2015 at 3:32 PM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Have the book.    Yes Oxygen is interesting stuff, not to be messed with
> !   Can make anything combustible.  Still not clear on the bronze issue
> however.
>
> 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] penetration schedule
> Date: Fri, 14 Aug 2015 10:10:01 -0400
>
>
> Hi Brian,
>
> I highly recommend a very small yet invaluable book Dan Lance once pointed
> me to. It is called The Oxygen Hacker's Companion, and the author is Vance
> Harlow. Oxygen is one area with specialized requirements that, if ignored,
> can result in a really bad day. Please be sure to read that book before you
> build anything that will handle O2.
>
> Best,
>
> Alec
>
> On Thu, Aug 13, 2015 at 11:58 PM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hank,
>              Can I put a bronze bushing in a ss coupling, if that is
> necessary for the O2?   Does the O2 need to not go through stainless?
>
>   I had a bad experience connecting stainless nipples into a
> stainless 90,  it galled so bad that I ruined the nipple getting it out of
> there. Maybe I just need to use more Teflon tape.
>
> brian
>
>
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org
> >
> To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] penetration schedule
> Date: Thu, 13 Aug 2015 20:46:45 -0700
>
> Hank,
>              It seems to me that it's easier to weld in couplings rather
> than nipples, I suppose it's just preference.   I sort of have a trim tank
> already with my forward hard ballast tank, I'm just not sure at this point
> whether or not that will be enough control.  A way to deal with varying
> loads is probably something I need to address, but I don't want to give up
> valuable cabin space for it.
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] penetration schedule
> Date: Thu, 13 Aug 2015 18:23:16 +0000 (UTC)
>
> Brian,
> I would add a few nipples and cap them off, you will want them down the
> road.
> A trim tank may be a good idea for such a heavy sub, unless you have real
> powerful vertical thrusters.  I find when I take a passenger, even my
> daughter Roman who is light as a feather, I am always quite over weight.
> That is no problem at all in a Gamma size sub because the vertical
> thrusters have enough jam to stop the sub hitting bottom.  A trim tank
> would be good to keep you closer to ideal weight, or have lots of small
> weights to take out.  I foolishly made two rather heavy lead weights.
> Are you running your O2 through a ss nipple, is that okay, I am planning
> to do that for external O2.  I remember talk about the K subs needing a
> Bronze fitting or something like that.
> Hank
>
>
>
> On Thursday, August 13, 2015 11:52 AM, Brian Cox via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
>
> Hank,
>             Here are all my penetrations:
>
> Front hard ballast tank
>  1.   flood valve -  1/2" ss rod thru hull
>  2.   vent valve
>  3.  air inject    -  ss coupling
>
> Main ballast tank (soft)
>  1. flood valve  - ss 1/2" rod thru hull
>  2. air inject
>
> mechanical penetrations:
>   1.  front flaps       - ss 1/2" rod thru hull  (all)
>   2. back flaps
>   3. motor turning   ( steering )
>
> Breathing Oxygen  -  3/4" coupling  or smaller  ( will bush)
>
> Flood Valve  - 1 1/2"  - ss coupling  ( near bottom)
>
> main ballast HP air in   -
>   #1 - 3/4"  ss coupling
>   #2 - 3/4"     ( will have bushings to 1/2" or smaller)
>
>
> Gauges
>   1.  Temperature  - 1/2"   ss coupling
>    2.  Pressure -    1/2"
>
> Release buoy
>   1.  1/2" SS rod thru hull
>
> Equalizing valve
>   1.  3/4" coupling
>
> Drop weight
>    1.  7/8" ss rod thu hull
>
> Hatch dog thu hull
>  1.  7/8" ss rod
>
>  Is there anything that I obviously forgot ??      All my electrical will
> be going through a separate viewport fitting.
>
> So far I have the front trim, hatch , but no air yet.
>
> Not sure if I want to have a small trim tank in the main cabin or not.
>
>
> Brian
>
>
>
>
>
>
>
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