[PSUBS-MAILIST] Commercial Grade O2 vs. Medical

Wed Jan 3 20:58:46 EST 2018

Per ABS, the inadvertent release of the contents of any single pressure vessel, if stored internally, must not raise the internal cabin pressure more than 1 atm (101.325 kPa) above the normal atmospheric pressure, nor raise the cabin air oxygen concentration above 23.5%. If an oxygen cylinder does not meet these requirements, it must be stored externally.

So, you can get away with storing any amount internally, provided you use a greater number of smaller vessels.

Sean

-------- Original Message --------
On Jan 3, 2018, 18:15, Brian Cox via Personal_Submersibles 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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>>>>> Personal_Submersibles at psubs.org
>>>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>>
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