[PSUBS-MAILIST] Scuba Tank DIN connector to JIC

Fri Oct 14 04:55:15 EDT 2016

Hello

I have a pressure reducing regulator connected to a manifold that allows me
to connect 2x tanks and set whatever pressure I want.

http://www.guernseysubmarine.com/Extended_files/Page15335.htm

Its nice and works well, but it was expensive and if I was doing this
again, I wouldn't bother with the regulator and just pipe the manifold to
the main pipes.  In fact, I probably wouldn't even bother with the manifold
as when I dive, I have one tank connected to emergency scuba anyway.  If I
need the second tank, I swap it out underwater.  Only had to do it once.

Keep it simple.

On 14 October 2016 at 00:59, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Correction, you won't be able to put air in your ballast tank
> below 200ft with a 100psi regulator inside the hull.
> Alan
>
> Sent from my iPad
>
> On 14/10/2016, at 12:53 pm, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Mark,
> sorry if I am insulting your intelligence here, but if you have a
> standard regulator inside the hull reducing the pressure to 100
> psi then you won't be able to blow your ballast tanks below 50ft.
> As Steve suggests, a scuba first stage regulator will give you
> 130 psi above the ambient water pressure, enabling you to put
> air in your ballast tanks at any depth.
> Just mentioning this because this mistake has been made before.
> Cheers Alan
>
>
> Sent from my iPad
>
> On 14/10/2016, at 11:55 am, Stephen Fordyce via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi Mark,
> Most SCUBA regulator first stages (the bit that goes onto a tank) will
> drop the pressure to about 150PSI, and you could happily adjust most of
> them to 100PSI instead.
>
> Bear in mind a regulator adds lots of different failure modes and if your
> shutoff is after the regulator you may well lose all the gas in the
> cylinder if there is a failure.  Probably doesn't matter in your
> case!  This is also a reason regulators have an overpressure valve (OPV) -
> in case they fail open and deliver full cylinder pressure into the low
> pressure downstream line.  Quite important if you don't have a SCUBA second
> stage (that bit that goes in your mouth) installed.
>
> Also after the regulator there is no way of knowing what's left in the
> cylinder.  A contents gauge is only useful on the high pressure side.
>
> A useful resource for dealing with SCUBA regulators:
> http://www.airspeedpress.com/newregbook.html
>
> The cheapest SCUBA regulators are for argon and/or drysuit inflation.  Ie:
> https://www.divegearexpress.com/inflation-regulator-w-opv
> They are not adjustable (but generally set to lower pressure, more like
> 100-125PSI) and often have slightly less flow.  I don't think the
> difference would be particularly significant for you.  They also tend to be
> 200bar DIN - so if you have a 300bar DIN valves they won't fit.
>
> SCUBA regulators for breathing are more expensive, but have higher flows
> and are meant to be more reliable, and adjustable.  You'd be looking for a
> DIN "first stage" (they are pretty much all dual 200/300bar compatible) and
> then you'll have to get a separate OPV. Ie:
> https://www.divegearexpress.com/regulators-spgs
>
> You'll also need one of these adaptors to turn the regulator outlet into
> NPT: https://www.divegearexpress.com/adapter-1-4-inch-npt-
> female-3-8-inch-m
>
> Cheers,
> Steve
>
> On Fri, Oct 14, 2016 at 12:55 AM, Mark via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Steve,
>>
>> Thanks for the clarification on the DIN connector.  In terms of the
>> pressure regulator, what device do most people use to regulate the air
>> pressure?  Is this something I could purchase from a SCUBA parts supply
>> company?
>>
>> Regards,
>>
>> Mark Widman
>> 910-638-5229
>>
>> Sent from iPhone.
>>
>> On Oct 13, 2016, at 9:17 AM, Sean T. Stevenson via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> 300 is short for 300 bar, or the recommended maximum pressure of the
>> fitting, indicating that it is a deeper thread than 200/232 bar fittings.
>> The latter can be used with yoke style regulators (CGA-850) by using an
>> insert in the female DIN on the tank valve. The 300 bar connection, being
>> deeper, precludes this but is stronger. Similarly, if you have a 300 bar
>> DIN fitting on your regulator, and screw it into a 200 bar DIN tank valve,
>> it is compatible, but will show a couple of exposed threads which can be
>> entrapment points.
>>
>> DIN 477 is the actual thread specification.  Rarely seen in SCUBA
>> equipment catalogs, but necessary if you're going to have a DIN thread
>> machined.
>>
>> Sean
>>
>>
>> On October 13, 2016 6:26:49 AM MDT, Mark via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>>
>>> Thanks Steve,
>>>
>>> This is exactly what I'm looking for.
>>> (1/4" m NPT x DIN 300 m)
>>>
>>> Sean recommended a DIN 477 connector, is there a difference (DIN 300 vs.
>>> DIN 477)?
>>>
>>> Lastly, I would like to regulate the air pressure to something more
>>> reasonable like 100 or so PSI.  Can you recommend an air pressure regulator?
>>>
>>> Regards,
>>>
>>> Mark Widman
>>> 910-638-5229
>>>
>>> Sent from iPhone.
>>>
>>> On Oct 12, 2016, at 10:27 PM, Stephen Fordyce via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>> Hi Mark,
>>> I have that sort of thing in my catalogue (TFM Engineering Australia),
>>> but being down under, not a lot of point sending them to you in the USA
>>> when you get can from the likes of:
>>> http://www.northshorecompressor.com/products/17B477D22-M-
>>> NPT-x-DIN-300-M.htmlhttp://www.northeastscubasupply.com/s
>>> earch.php?search_query=DIN+NPT&Search=
>>>
>>> You might be able to do a bit better if you look around - but avoid the
>>> ones with bleeders for your application in ca! se it gets knocked.
>>>
>>> Cheers
>>> Steve
>>>
>>>
>>> On Thu, Oct 13, 2016 at 6:44 AM, Mark via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>>> Hi Sean,
>>>>
>>>> I have four SCUBA tanks mounted on the outside of the sub.  The SCUBA
>>>> tanks are used to provide/control air for the external ballast tanks.  The
>>>> air line runs from the SCUBA tank to a thru hull fitting in the sub (to a
>>>> control valve) and then back out to the ballast tanks.  I need to acquire a
>>>> connector from the SCUBA DIN to either NPT or JIC.
>>>>
>>>> If I can order a DIN 477 to NPT that would suffice.
>>>>
>>>> Regards,
>>>>
>>>> Mark Widman
>>>> 910-638-5229
>>>>
>>>> Sent from iPhone.
>>>>
>>>> On Oct 12, 2016, at 3:15 PM, Sean T. Stevenson via
>>>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>>
>>>> That's an oddball to find as a single piece, but you can certainly find
>>>> male DIN 477 to e.g. NPT, and adapt that to a NPT/JIC.
>>>>
>>>> What are you building?
>>>>
>>>> Sean
>>>>
>>>>
>>>> On October 12, 2016 12:49:50 PM MDT, Mark via Personal_Submersibles <
>>>> personal_submersibles at psubs.org> wrote:
>>>>>
>>>>> Good afternoon, Psubs team:
>>>>>
>>>>> Do you know if and where I could purchase a SCUBA tank DIN to JIC connector?
>>>>>
>>>>> Regards,
>>>>>
>>>>> Mark...
>>>>> 910-638-5229
>>>>>
>>>>> Sent from iPhone.
>>>>>
>>>>> ------------------------------
>>>>>
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>>>>>
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