[PSUBS-MAILIST] onboard O2

[Alan via Personal_Submersibles]

Hi Greg,
I worked it out like this; if a 70 cubic ft tank emptied into your 71 cubic ft hull
it would increase pressure by nearly 1 atmosphere. However I am not sure
what pressure of O2 you would put in your tank. where I get fills it's 3000psi 
for air & 2000psi for O2.
As to the percentage of O2 criteria, I converted your 71 cubic ft to litres which
gave me 2010.5 cubic litres. With O2 being 21% this means there are 422.1 litres
of O2 in your hull. At G.L.s limit of 25% there would need to be 502.625 litres
of O2. So 502.625 - 422.1 = only 80.525 litres needed to take you to the limit.
(2.84 cuft)
Cheers Alan


Sent from my iPad

> On 8/05/2017, at 11:55 AM, james cottrell via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi Alan,
> 
> My hull volume is 71 cubic ft. What size O2 bottles could I carry inside according to G.L. rules?
> 
> Thanks,
> 
> Greg
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Sunday, May 7, 2017 6:14 PM
> Subject: Re: [PSUBS-MAILIST] onboard O2
> 
> Hi Hank,
> here are the G.L. rules regarding O2 storage inside the hull.
>    " For storage of the oxygen bottles within the pressure hull the volume of 
> the bottle is to be restricted in such a way that the pressure does not exceed
> by one atmosphere & the O2 content does not  exceed 25% by volume if the
> complete contents escape."
>    I have seen a burst disk on a tank go & the tank wasn't at any elevated
> heat.
> Alan
> 
> 
> Sent from my iPad
> 
>> On 8/05/2017, at 9:15 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Rick,
>> Valid points for sure, but in my case I have small bottles instead of one large bottle.  Also the regulator fits directly to the tank, so the risk is so minimal.  It comes down to our own personal experiences and comfort level.  If I have a leak, the alarm will scream before the pressure is an issue.  If you are real concerned about over pressures, pick up a small 12 v compressor and plumb it into a small tank to get rid of the pressure.  That is one of the benefits of Gamma's internal HP compressor.
>> Hank
>> 
>> 
>> On Sunday, May 7, 2017 11:33 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Hi All,
>> I have purchased a few new medical O2 bottles for Elementary 3000.  I got a bit worried after the O2 piping and penetrating discussion.  I will have internal O2 supply and I admit I had some reservations because the big guys don't do that.  Then! this morning I was watching a show on TV about a Saudi Prince flying around in his beautiful two seater glider.   Low and behold, there it was, behind  the pilot, a O2 bottle.  If airplanes can carry O2 tanks inside the plane, why not a submarine?  
>> Hank
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>> 
>> 
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> 
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> 
> 
> 
> 	Virus-free. www.avast.com
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20170508/8e534533/attachment-0001.html>