[PSUBS-MAILIST] onboard O2

[Sean T. Stevenson via Personal_Submersibles]

ABS is slightly more restrictive.  Any single bottle, if emptied into the passenger compartment, must not raise the internal pressure more than 1 atm, nor the oxygen concentration above 23% (i.e. the normal upper alarm limit). If it does, the bottle has to be stored externally.

Sean


On May 7, 2017 4:12:48 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>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
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