[PSUBS-MAILIST] O2 tanks

[Alan via Personal_Submersibles]

Cliff, ( or anyone)
I was thinking of ways of making my one person sub idiot proof with 
regard to the turning on of the O2 supply. If I let anybody dive it I won't
be in there to oversee.
My ideas are to have a switch under the seat ( as they have on ride on lawn
mowers) & a hatch closure switch ( which is required by G.L. ) linked to
the O2 system so that when both switches are closed ( pilot seated &
hatch closed) the O2 feed system is activated. This will be the solenoid top
up part of the O2 system. A sign & maybe audible voice will say " Turn on Oxygen
valve". So the system will be like the DW O2 add system where there is a 
minimal amount of O2 constantly flowing but the balance flows in from a solenoid
valve activated by O2 level readings.
The CO2 scrubber could also be linked.
Any thoughts on this?
Thanks Alan

 


Sent from my iPad

> On 2/07/2017, at 1:13 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Cliff,
> That is exactly what I did, I put the tank specs in the unstiffened cylinder program.  The only problem is, I can not findways of  the exact material the steel tanks are made from.  I am assuming same steel and gives a good estimate.
> Thanks Cliff
> Hank
> 
> 
> On Saturday, July 1, 2017 6:05 PM, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Most of the FEA packages associated with 3-d modeling software use a linear model.  You would need an FEA tool that can model buckling to study this.  An alternative is to use the ABS stress analysis spreadsheet with no stiffeners.  This would give a conserative crush depth.
> 
> Cliff
> 
> 
> Cliff Redus
> 
>> On Jul 1, 2017, at 2:27 PM, Scott Waters via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
> 
> 
> I am unsure of the depth rating of an empty scuba tank. It could be easily found out on a solidworks simulation.
> Thanks,
> Scott
> 
> 
> 
> Sent from my U.S. Cellular® Smartphone
> 
> -------- Original message --------
> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
> Date: 7/1/17 12:34 PM (GMT-05:00)
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] O2 tanks
> 
> Thanks' Scott,Do you know what the max depth rating for an empty Scuba O2 tank is.  I suppose you could increase the rating by using only part of the volume and leave pressure inside them.  A sub could carry several in that case since they are close to neutral buoyant.  Hank 
> 
>     On Saturday, July 1, 2017 8:25 AM, Scott Waters via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hank,Alvin has all the O2 supply internally. Pisces has the mission O2 internally and emergency supply externally in special steel cylinders that are pressure tested to 1.25 max depth while empty.Thanks,Scott Waters
> 
> 
> Sent from my U.S. Cellular® Smartphone
> -------- Original message --------From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> Date: 7/1/17 9:59 AM (GMT-05:00) To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> Su
>> 
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