[PSUBS-MAILIST] Commercial Grade O2 vs. Medical

Wed Jan 3 20:35:08 EST 2018

Brian,
it's 1 atmosphere above the atmosphere in the sub. But as I posted a
little while back the more restrictive rule with O2 release in to the cabin
is that it is not allowed to increase the O2 % to more than 25%. This is
probably due to the heightened fire risk with higher concentrations of O2. 
If you know the internal volume of your sub then we can calculate the
maximum size tank you are allowed.
Alan

Sent from my iPad

> On 4/01/2018, at 2:15 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,        It's a long list !    What I need to do is make a check list of things I have wrong ;-)    and  then "things I have wrong but can maybe slide on"  !    One question, right of the bat,  with that O2 not being able to fill the cabin space more than one atmosphere,  I'm not understanding the terminology , how can it be possible to release a volume of air from a bottle WITHOUT raising the pressure above one atm if your are already at one atm ?
>  
> I should go around my sub with a video camera inside and out and you could really get an idea of what I need !    For instance I know I need an additional ballast tank HP cylinder. 
>  
> Brian 
>  
> 
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Commercial Grade O2 vs. Medical
> Date: Thu, 4 Jan 2018 13:52:57 +1300
> 
> Brian,
> fire away; there are a few people on psubs that are familiar with GL & or
> ABS. 
> Alan
> 
> Sent from my iPad
> 
> On 4/01/2018, at 1:37 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Great info Alan !           BTW  I need to pick your brain on some of the Lloyd's or ABS regs or equivalent.
>  
> Brian
>  
>   
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Commercial Grade O2 vs. Medical
> Date: Thu, 4 Jan 2018 13:22:59 +1300
> 
> Brian, 
> here is a link with some info.
> https://www.padi.com/padi-courses/emergency-oxygen-provider
> The best way about it is to enquire at your local dive shop as they will 
> probably run a course if they have a few interested people.
> Alan
> 
> 
> Sent from my iPad
> 
> On 4/01/2018, at 1:04 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Brian,
> I did an Emergency O2 providers course at a dive shop that sold O2.
> Now have a card with my face on it.
> I don't know if there are any regulations, but I get on well with the manager
> & this is what he was happy with me doing before he would fill O2.
> This was the easiest option, cheap & Only a couple of nights. 
> I think if I went to any dive shop in the World & pulled out my Padi O2 card
> they would be happy to fill. Also we are carrying O2 so are able to provide it
> in a diving emergency, so thats an advantage to divers.
> Medical O2 providers may also be convinced to fill for you if you have the card.
> The other option for me was to do a mixed gas diving course which is much
> more expensive & intense.
> Cheers Alan
>  
> 
> Sent from my iPad
> 
> On 4/01/2018, at 12:16 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,           What's involved with getting a O2 cert for administering O2 ?
>  
> Brian
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Commercial Grade O2 vs. Medical
> Date: Thu, 4 Jan 2018 11:21:46 +1300
> 
> Steve,
> not the most experienced but this is what I'm doing.
> I have 2 steel O2 cleaned tanks. ( 2 tanks as per GL for redundancy)
> I have O2 cleaned scuba regulators & get my tanks filled at a dive shop.
> Had to have an emergency O2 provider cert first.
> I believe Nuytco were using composite tanks at one stage.
> O2 tank options & fitting options here. (EMT medical)
> http://www.emtmedicalco.com/OXYGEN-CYLINDERS-ALUMINUM-STEEL-COMPOSITE_c64.htm
> You will need a tank fitting suitable for where you intend filling i.e. dive shop
> or medical O2 supplier. Then you will need a compatible regulator . If you were 
> heading across country for a few dives maybe have interchangeable fittings or 
> spare tanks with different fittings if you need to switch between medical & dive
> suppliers. ( I haven't heard this discussed before) 
> I have heard people say that medical & commercial O2 tank swap people don't
> like the idea of their tanks going under the water. They also may require some
> sort of certificate from you before they fill.
> Have read of deaths from people using commercial rather than medical O2, but
> this would be 100% O2 inhaled straight in to the lungs.
> Phil offered to sell his O2 add system to Psubbers.
> I am using a paediatric flow meter set at a minimal flow & are topping up via
> 3 x O2 sensors wired to my PLC & operating a solenoid valve on the low pressure 
> O2 line. The PLC will be comparing the 3 readings & going with the average of
> the 2 readings closest to each other. The PLC will notify me when the range of
> one O2 sensor is out relative to the other 2 or the reading of the nearest 2 differ 
> by a certain amount & may need replacing. I think the life of a sensor is only
> a year or so depending on the heat it is stored at. Being a small one person sub
> I need to be a lot more careful as the O2 % can change a lot more quickly.
> Cheers Alan
> 
> 
> 
> 
> Sent from my iPad
> 
> On 4/01/2018, at 7:10 AM, Steve McQueen via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> I tried to search the archives but it wasn't very friendly.  Sorry to again ask about something I know has probably been discussed.
> 
> I wanted to double ck. my O2 strategy.  After some investigation it seems I will buy a new steel high pressure oxygen tank for external mounting. My plan is to have it refilled with "commercial grade" O2 vs. medical grade 02.  As long as I keep my "personal" tank and not allow the filler to swap tanks I should create a "chain of custody" that will help me feel good about not having contamination.
> 
> I am wondering how others are managing.
> 
> Thanks,
> Steve
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