[PSUBS-MAILIST] O2 tanks (via Personal_Submersibles)

Sun Jul 2 12:45:01 EDT 2017

Jerry, Inventor FEA base module is linear model only.  It will only solve
one of the three possible failure modes and not either of the buckling
modes,

Cliff

On Sun, Jul 2, 2017 at 9:19 AM, Jerry Koontz via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Autocad Inventor has the FEA tool built in and works really well.
>
> ----- Original Message -----
> From: "via Personal_Submersibles" <personal_submersibles at psubs.org>
> To: "personal submersibles" <personal_submersibles at psubs.org>
> Sent: Sunday, July 2, 2017 12:47:36 AM
> Subject: Personal_Submersibles Digest, Vol 49, Issue 3
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> Today's Topics:
>
>    1. Re: O2 tanks (via Personal_Submersibles)
>    2. Re: O2 tanks (hank pronk via Personal_Submersibles)
>    3. Re: O2 tanks (Alan via Personal_Submersibles)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 1 Jul 2017 18:59:23 -0500
> From: via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
>         <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] O2 tanks
> Message-ID: <57782A8F-9754-4039-ADC3-58C64B181810 at gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Most of the FEA packages associated with 3-d modeling software use a
> linear model.  You would need an FEA tool that can model buckling to study
> this.  An alternative is to use the ABS stress analysis spreadsheet with no
> stiffeners.  This would give a conserative crush depth.
>
> Cliff
>
>
> Cliff Redus
>
> > On Jul 1, 2017, at 2:27 PM, Scott Waters via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
> >
> > I am unsure of the depth rating of an empty scuba tank. It could be
> easily found out on a solidworks simulation.
> > Thanks,
> > Scott
> >
> >
> >
> > Sent from my U.S. Cellular? Smartphone
> >
> > -------- Original message --------
> > From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.
> org>
> > Date: 7/1/17 12:34 PM (GMT-05:00)
> > To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> > Subject: Re: [PSUBS-MAILIST] O2 tanks
> >
> > Thanks' Scott,Do you know what the max depth rating for an empty Scuba
> O2 tank is.  I suppose you could increase the rating by using only part of
> the volume and leave pressure inside them.  A sub could carry several in
> that case since they are close to neutral buoyant.  Hank
> >
> >     On Saturday, July 1, 2017 8:25 AM, Scott Waters via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> >
> >
> > Hank,Alvin has all the O2 supply internally. Pisces has the mission O2
> internally and emergency supply externally in special steel cylinders that
> are pressure tested to 1.25 max depth while empty.Thanks,Scott Waters
> >
> >
> > Sent from my U.S. Cellular? Smartphone
> > -------- Original message --------From: hank pronk via
> Personal_Submersibles <personal_submersibles at psubs.org> Date: 7/1/17 9:59
> AM (GMT-05:00) To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org> Su
> > _______________________________________________
> > Personal_Submersibles mailing list
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> ------------------------------
>
> Message: 2
> Date: Sun, 2 Jul 2017 01:13:38 +0000 (UTC)
> From: hank pronk via Personal_Submersibles
>         <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
>         <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] O2 tanks
> Message-ID: <1987652214.3245144.1498958018223 at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
> Cliff,That is exactly what I did, I put the tank specs in the unstiffened
> cylinder program. ?The only problem is, I can not find the exact material
> the steel tanks are made from. ?I am assuming same steel and gives a good
> estimate.Thanks CliffHank
>
>     On Saturday, July 1, 2017 6:05 PM, via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
>  Most of the FEA packages associated with 3-d modeling software use a
> linear model. ?You would need an FEA tool that can model buckling to study
> this. ?An alternative is to use the ABS stress analysis spreadsheet with no
> stiffeners. ?This would give a conserative crush depth.
> Cliff
>
> Cliff Redus
> On Jul 1, 2017, at 2:27 PM, Scott Waters via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
>
> I am unsure of the depth rating of an empty scuba tank. It could be easily
> found out on a solidworks simulation.Thanks,Scott
>
>
> Sent from my U.S. Cellular? Smartphone
> -------- Original message --------From: hank pronk via
> Personal_Submersibles <personal_submersibles at psubs.org> Date: 7/1/17
> 12:34 PM (GMT-05:00) To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org> Subject: Re: [PSUBS-MAILIST] O2 tanks
> Thanks' Scott,Do you know what the max depth rating for an empty Scuba O2
> tank is. ?I suppose you could increase the rating by using only part of the
> volume and leave pressure inside them. ?A sub could carry several in that
> case since they are close to neutral buoyant. ?Hank
>
> ??? On Saturday, July 1, 2017 8:25 AM, Scott Waters via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
>  Hank,Alvin has all the O2 supply internally. Pisces has the mission O2
> internally and emergency supply externally in special steel cylinders that
> are pressure tested to 1.25 max depth while empty.Thanks,Scott Waters
>
>
> Sent from my U.S. Cellular? Smartphone
> -------- Original message --------From: hank pronk via
> Personal_Submersibles <personal_submersibles at psubs.org> Date: 7/1/17 9:59
> AM (GMT-05:00) To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org> Su
> _______________________________________________
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> ------------------------------
>
> Message: 3
> Date: Sun, 2 Jul 2017 17:47:43 +1200
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
>         <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] O2 tanks
> Message-ID: <99C62E5C-67D0-4A55-8CBD-F816E8A1586C at yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
> Cliff, ( or anyone)
> I was thinking of ways of making my one person sub idiot proof with
> regard to the turning on of the O2 supply. If I let anybody dive it I won't
> be in there to oversee.
> My ideas are to have a switch under the seat ( as they have on ride on lawn
> mowers) & a hatch closure switch ( which is required by G.L. ) linked to
> the O2 system so that when both switches are closed ( pilot seated &
> hatch closed) the O2 feed system is activated. This will be the solenoid
> top
> up part of the O2 system. A sign & maybe audible voice will say " Turn on
> Oxygen
> valve". So the system will be like the DW O2 add system where there is a
> minimal amount of O2 constantly flowing but the balance flows in from a
> solenoid
> valve activated by O2 level readings.
> The CO2 scrubber could also be linked.
> Any thoughts on this?
> Thanks Alan
>
>
>
>
> Sent from my iPad
>
> > On 2/07/2017, at 1:13 PM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
> >
> > Cliff,
> > That is exactly what I did, I put the tank specs in the unstiffened
> cylinder program.  The only problem is, I can not findways of  the exact
> material the steel tanks are made from.  I am assuming same steel and gives
> a good estimate.
> > Thanks Cliff
> > Hank
> >
> >
> > On Saturday, July 1, 2017 6:05 PM, via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
> >
> >
> > Most of the FEA packages associated with 3-d modeling software use a
> linear model.  You would need an FEA tool that can model buckling to study
> this.  An alternative is to use the ABS stress analysis spreadsheet with no
> stiffeners.  This would give a conserative crush depth.
> >
> > Cliff
> >
> >
> > Cliff Redus
> >
> >> On Jul 1, 2017, at 2:27 PM, Scott Waters via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
> >>
> >
> >
> > I am unsure of the depth rating of an empty scuba tank. It could be
> easily found out on a solidworks simulation.
> > Thanks,
> > Scott
> >
> >
> >
> > Sent from my U.S. Cellular? Smartphone
> >
> > -------- Original message --------
> > From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.
> org>
> > Date: 7/1/17 12:34 PM (GMT-05:00)
> > To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> > Subject: Re: [PSUBS-MAILIST] O2 tanks
> >
> > Thanks' Scott,Do you know what the max depth rating for an empty Scuba
> O2 tank is.  I suppose you could increase the rating by using only part of
> the volume and leave pressure inside them.  A sub could carry several in
> that case since they are close to neutral buoyant.  Hank
> >
> >     On Saturday, July 1, 2017 8:25 AM, Scott Waters via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> >
> >
> > Hank,Alvin has all the O2 supply internally. Pisces has the mission O2
> internally and emergency supply externally in special steel cylinders that
> are pressure tested to 1.25 max depth while empty.Thanks,Scott Waters
> >
> >
> > Sent from my U.S. Cellular? Smartphone
> > -------- Original message --------From: hank pronk via
> Personal_Submersibles <personal_submersibles at psubs.org> Date: 7/1/17 9:59
> AM (GMT-05:00) To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org> Su
> >>
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> >> Personal_Submersibles mailing list
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> >> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> >
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> > Personal_Submersibles mailing list
> > Personal_Submersibles at psubs.org
> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> >
> >
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> > Personal_Submersibles mailing list
> > Personal_Submersibles at psubs.org
> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
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