[PSUBS-MAILIST] onboard O2

Sun May 7 19:00:27 EDT 2017

I have to agree with Hank on this one. We have to remember that the rules were meant to cover lots of different vehicles- some of them big commercial subs with multiple passengers that went deep, stayed down a long time and had BIG tanks of O2 that had to go outside. For home builders, the absolute safest way may be beyond our capabilities. For instance- 
External frames have many advantages over internal frames, BUT, if your not an expert welder, the internal style is the way to go for dependability.
Same is true for acrylic. Every one knows that conical viewports are stronger that flat disc, right? But did you know that flat discs fail in the center and distort badly before they break while conical viewports usually fail on the high pressure surface with no warning? Sometimes low tech is safer.
Same with batteries. Everyone knows that batteries should go outside in a external pod, right? But what happens if that external space floods? Even pro subs like Pisces can get trapped with a floodable space.
It would be great if there were a book that has all the tricks for building the safest subs possible at various levels of cost, depth capability and expertise. What one guy may be able to do with the tools available may not be the best for some one else.
Greg

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Sunday, May 7, 2017 5:21 PM
 Subject: Re: [PSUBS-MAILIST] onboard O2

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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