[PSUBS-MAILIST] First Stage Regulator for O2 service Questions

Mon Dec 25 17:55:11 EST 2017

Thank  you Alan,  thats why an scuba regulator is not necessary if we have
a regulator and a flow meter, and they are using scuba tanks o scuba tank
valves ( yoke or din ) to transport the  O2 and use scuba hoses and
plumbing, not because they will carry air.now i understand,  on the deco
bottles we use O2 , the pressure is around 145 psi, But we never down more
than 100 ft thank`s

2017-12-25 23:11 GMT+01:00 Alan via Personal_Submersibles <
personal_submersibles at psubs.org>:

> Roberto,
> within the 1atm hull of a submarine you have O2 coming in at the same rate
> that your
> body consumes it. The O2 consumed is breathed out as CO2 & this is scrubbed
> away. So there is no pressure build up in the sub. If you have a 40% mix
> of O2 & nitrogen
> or any other gas then you will build up pressure inside the hull.
> Alan
>
> Sent from my iPad
>
> On 26/12/2017, at 10:42 AM, roberto alvarez via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Why are using puere oxigen, i  practice scuba diving and we use compresed
> air, can use mix with 40% , but why puer oxigen on the sub?
>
> 2017-12-25 22:08 GMT+01:00 Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org>:
>
>> Hi Alan,
>>
>> Just to clarify, I was referring to HP Oxygen. For air I do bring HP into
>> the hull and there is a 1st stage inside for the BIBS.
>>
>> Thanks,
>> Alec
>>
>> On Mon, Dec 25, 2017 at 3:28 PM, Alan via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> Steve,
>>> another factor that may influence your decision is how you want to
>>> set up a BIBS. If you have a divers regulator for emergency breathing
>>> they
>>> normally operate off 130 psi. Hmmm got me thinking now; if the emergency
>>> regulator is operating off a line directly from the  1st stage regulator
>>> external
>>> to the hull then it will see 130 psi above ambient. So at your max depth
>>> it will
>>> see 255 psi.
>>> Conversely if you had a high pressure line to your sub & a regulator
>>>  dropping
>>> the pressure to 130psi, then if you needed to flood your sub to get out
>>> the
>>> regulator would only see 5 psi above ambient by the time the sub filled,
>>> if you
>>> were escaping from 250ft.
>>> Alan
>>>
>>> Sent from my iPad
>>>
>>> On 26/12/2017, at 8:56 AM, Alec Smyth via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>> Hi Steve,
>>>
>>> I use a 1st stage outside the hull. As you say the flow regulator can
>>> handle the tank pressure, so it is not strictly necessary, but I do so as
>>> an extra safety precaution to avoid bringing high pressure O2 inside. If
>>> doing it again I would the reg directly on the tank, so that way all of the
>>> tubing would see only low pressure.
>>>
>>> I'm using a 1st stage that is incredibly inexpensive ($60), but I'm
>>> delighted with the quality and what is a big plus for me, it's a
>>> particularly simple design. I've collected three of them by now, and not
>>> any problem at all.
>>>
>>> https://www.piranhadivemfg.com/item/Balance-Piston-Din-First
>>> -Stage--For-Pony--Stage-Bottles--Nitrox-Ready-11738
>>>
>>> I do my own oxygen cleaning on tubing and penetrators, but prefer to buy
>>> O2-clean regs and valves. You may notice this reg is advertised for Nitrox,
>>> not pure oxygen. I spoke to the owner of the business selling it, and he
>>> told me the cleaning and materials are identical for partial or full O2,
>>> but that they advertise it only for partial O2 use as a legal CYA.
>>>
>>>
>>> Best,
>>> Alec
>>>
>>> On Mon, Dec 25, 2017 at 12:50 PM, Steve McQueen via
>>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>
>>>> All, I am purchasing the system components for my K-250’s O2 system.  I
>>>> am not a SCUBA diver so I lack some experience with regulators. I am
>>>> considering sealed/balanced options for the first stage regulator (it will
>>>> create an intermediate pressure downstream of the O2 tank (located external
>>>> of the hull). These get pricey and I don’t really want to overspend for
>>>> options I do not need (sealed vs. not, balanced vs. unbalanced, O2 ready
>>>> vs. needing cleaned).
>>>>
>>>>
>>>>
>>>> A couple of questions:
>>>>
>>>>    1. They sell regulators that are already suitable for 100% O2 use.
>>>>    How difficult to clean one that is not O2 ready?
>>>>    2. The pediatric flow regulator (located in the hull) can directly
>>>>    handle the O2 tank pressure so I am wondering why we use the first stage
>>>>    regulators at all.
>>>>       1. I assume to remove as many HP leak sources from within the
>>>>       hull especially since it is 100% O2 (safety).
>>>>
>>>>
>>>>
>>>> Thoughts/recommendations?
>>>>
>>>>
>>>>
>>>> Steve
>>>>
>>>>
>>>>
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>>>>
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>>
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