[PSUBS-MAILIST] Fw: Gamma

Fri Mar 17 18:18:24 EDT 2017

I agree with Hank on having the O2 inside when talking about a small tank (or multiple small tanks). The likelihood that an O2 tank will leak or blow up is pretty slim.
Even so, when talking about larger tanks (large enough to create a dangerous concentration if it DID leak) then the tank should really go outboard and have a shut off valve in the hull.
Also, in the event that the external tank needed to be shut off, a small internal tank for back up might come in handy.
Greg

      From: Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, March 17, 2017 5:36 PM
 Subject: Re: [PSUBS-MAILIST] Fw: Gamma

Can anyone recommend a good 02 flow meter without a regulator as I am coming into the sub as LP o2.
Rick
On Sun, Mar 12, 2017 at 9:45 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Seems to me a medical O2 tank inside the sub with a regulator venting into the compartment is the safest.  I also carry a 35cuft O2 bottle to refill the medical tank.Hank 

    On Sunday, March 12, 2017 1:28 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

 The NASA thing was because of the 100% oxygen environment, which makes an inferno out of anything burning. This was exascerbated by the fact that they had a tendency to use tons of velcro everywhere, which became a fuel source in the elevated oxygen environment. If your cabin environment is only air, as it should be, then the fire risk from oxygen piping exists only from the metals themselves or any entrained hydrocarbons.  Machining operations which create sharp or thin edges within fittings can make the parts internally susceptible to burning in the presence of a source of ignition, which adiabatic heat from high rates of compression (i.e. a fast acting oxygen valve) in combination with residual hydrocarbons in the fittings / piping can represent.  Also, all materials used in the personnel space, which includes but is not limited to the materials used in hoses, must be self-extinguishing / fire resistant. A hose burning will ! likelycause it to rupture.Sean

On March 12, 2017 12:40:45 PM MDT, Rick Patton via Personal_Submersibles <personal_submersibles at psubs. org> wrote:
Thanks for the input guys. My 02 bottles will be medical bottles that come already cleaned and be outside with 02 cleaned first stage regulators on them to go to LP right away and then I'll buy 02 cleaned LP hose to go to the SS threw hull fitting that's welded to the hull. The sked 80 SS threw hull, 90 degree street ell and 1/4" turn stop valve weren't cleaned though so those should be easy to clean based on your input. I'll also go with factory 02 cleaned rubber hose to the flow meter so it would be just those three thing. Just out of curiosity though, if a fire occurred from carbon/contamination  or whatever, would the fire just burn very briefly in the hose and then go out or would there be an explosion that would rupture the hose? As I recall, the unfortunate fire that occurred at NASA in the capsule with the three astronauts, wasn't that a quick fire with no explosion? 
Rick

On Sun, Mar 12, 2017 at 7:49 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

Not all detergents are the same in this regard. You need something with a high affinity for hydrocarbons which is residue free. Simple green and formula 409 are mentioned in the Oxygen Hacker's Companion, but I always use orange TKO. I use vinegar on regulator and valve parts to remove corrosion, and will scrub these after the vinegar soak, and then wash them with an orange TKO solution as the next step before rinsing with distilled or filtered water. Cylinders just get a hot orange TKO solution wash, followed by a clean water rinse.I wouldn't use solvents for cleaning lines for oxygen service, although you can if you subsequently flush the lines to remove all traces of the solvent afterwards. A quick detergent solution flush, followed by a clean water rinse, followed by blowing out with clean dry air or nitrogen should suffice. I like to pull vacuum on everything I put together to ensure that any remaining water or volatiles are evaporated, but that may not be practical for everyone.Note also that I only ever bother with this for 100 % oxygen service at high pressures. Most of the time, I assemble tubing and fittings as delivered, blow it out once with nitrogen to remove any loose particles, and call it a day.Sean

On March 11, 2017 11:50:54 AM MST, Brian Cox via Personal_Submersibles <personal_submersibles at psubs. org> wrote:
Rick,           I haven't, but my understanding is that just soap and water is sufficient.  Using a dish washing liquid.  Brian

--- personal_submersibles at psubs. org wrote:

From: Rick Patton via Personal_Submersibles <personal_submersibles at psubs. org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs. org>
Subject: Re: [PSUBS-MAILIST] Fw: Gamma
Date: Sat, 11 Mar 2017 08:09:48 -1000

has anyone 02 cleaned the insides of tubes or fittings before using the solvent method?
Rick
OnSat, Mar 11, 2017 at 5:37 AM, Gregory Snyder via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

Indeed!!! Awesome boat!
On Mar 11, 2017, at 7:19 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

Thanks' guys, I am pretty pleased with how Gamma has turned out.  I can not think of a single thin! g I wantto do her now.  I have always had a diesel engine in mind but  that might have been a want, not a need.Hank 

    On Friday, March 10, 2017 7:25 PM, Douglas Suhr via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

 Beautiful Hank! What a fine sub you've got there. ~ Doug S.

On 3/10/17, Rick Patton via Personal_Submersibles
<personal_submersibles at psubs. org> wrote:
> Lookin good Hank!
>
> Rick
>
> On Fri, Mar 10, 2017 at 1:58 PM, Alan via Personal_Submersibles <
> personal_submersibles at psubs. org> wrote:
>
>> Thanks Hank,
>> I enjoy watching! thevideos. All the best for the ensuing dive & look
>> forward
>> to hearing the report.
>> Alan
>>
>> Sent from my iPad
>>
>> On 11/03/2017, at 11:28 AM, hank pronk via Personal_Submersibles <
>> personal_submersibles at psubs. org> wrote:
>>
>> New video of arm assembly on Gamma.
>> Hank
>>
>>
>> On Friday, March 10, 2017 3:27 PM, xxx xxxxx <mp13 at live.ca> wrote:
>>
>>
>> https://www.youtube.com/watch? v=S9HGAFanbNE
>> <Image 2017-03-10 at 3.27 PM.jpg>
>>
>>
>> <Image 2017-03-10 at 3.27 PM.jpg>
>! >
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