[PSUBS-MAILIST] bolt in penetration
Sean T. Stevenson via Personal_Submersibles
personal_submersibles at psubs.org
Sat Jan 10 15:15:17 EST 2015
If the university doesn't have the info, it should at least be traceable. All vessels built to ASME Section VIII Division 1 require a nameplate that will list the manufacturer, serial number, etc. Failing that, metallurgical tests are possible, but a bit more involved.
Sean
On January 10, 2015 12:54:26 PM MST, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Sean,
>Is there a on site test that can be done to determine the alloy?
>Hank
>--------------------------------------------
>On Sat, 1/10/15, Sean T. Stevenson via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
> Subject: Re: [PSUBS-MAILIST] bolt in penetration
>To: "Personal Submersibles General Discussion"
><personal_submersibles at psubs.org>
> Received: Saturday, January 10, 2015, 2:46 PM
>
> Parallel projects... Sister subs... Could be
> fun.
> Sean
>
>
>
>
> On January 10, 2015
> 12:19:38 PM MST, hank pronk via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
> Yes but
> there two of them.
> Hank
> On Sat, 1/10/15, Sean T. Stevenson via
> Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
> Subject: Re: [PSUBS-MAILIST]
> bolt in penetration
> To: "Personal
> Submersibles General Discussion"
> <personal_submersibles at psubs.org>
>
> Received: Saturday, January 10, 2015, 2:16 PM
>
> If it is suitable, I presume
> you're calling
> dibs?
>
> Sean
>
>
>
>
>
> On January 10, 2015
> 12:10:14 PM MST, hank pronk via
> Personal_Submersibles
>
> <personal_submersibles at psubs.org> wrote:
>
> Sean,
> I may
> be able to on Monday. The sphere was
> owned
> by a university and we can contact them to find the
> manufacturer. Given that is was used as a
> pressure vessel
> paid for by a university
> working on a government project, I
> have to
> assume it is good stuff. Not very scientific but a
> fair assumption at!
> this
> stage. Luckily it is right in
> Brian's
> back yard in California so he was able to look
> at it and might be able to do some detective
> work.
>
> Hank
> On Sat, 1/10/15, Sean T. Stevenson via
> Personal_Submersibles
>
> <personal_submersibles at psubs.org> wrote:
>
> Subject: Re:
> [PSUBS-MAILIST]
> bolt in penetration
> To: "Personal
>
> Submersibles General Discussion"
>
> <personal_submersibles at psubs.org>
>
> Received: Saturday, January 10, 2015, 2:02
> PM
>
> Hank, any chance you
> can
> find out what the alloy
> is? This will have
> a
> profound effect on its efficacy.
> Sean
>
>
>
>
> On!
>
> January
> 10, 2015
> 11:51:22
> AM MST, hank pronk via
>
> Personal_Submersibles
>
>
> <personal_submersibles at psubs.org> wrote:
>
> Sean,
>
>
> Thank you, that is helpful. My idea was
> to
>
> make the insert as t!
> ight as
> possible (sweat it in) I am
> not
> sure if the difference in material
> would cause a problem
>
> though. The idea of
> seating the port into
> the shell a good
>
> option
> also. I am just chewing the fat here, I have
> enough
> on my plate but it is
> fun to think
> about. I was wrong about
> the size, the
> sphere is 6
> feet and I wrote 60 in. I imagine
> that
> kills the rating quite a bit?
> Hank
> On Sat, 1/10/15,
> Sean T.
> Stevenson via Personal_Submersibles
>
> <personal_submersibles at psubs.org>
>
> wrote:
>
> Subject: Re:
> [PSUBS-MAILIST]
> bolt in
> penetration
> To: "Personal
>
> Submersibles General
> Discussion"
>
>
> <personal_submersibles at psubs.org>
>
>
> Received: Saturday, January 10, 2015!
> , 1:40
> PM
>
>
> You could certainly
> do
> that,
> although a three inch
> thick shell is pretty
> !
>
>
> substantial - I might consider
>
> machining
> eg. conical window
> seats in the
> hull sh!
>
> ell
> directly,
> and then
> derating the hull
> to a depth
> whereby the
> actual hull
>
> thickness is the effective
> derated thickness
> plus the effective
> reinforcement, which
> just
>
> happens to be a
>
>
> contiguous shell. The
> bolt-in
> arrangement
> would not act as
> hull
>
>
> reinforcement though - unless it was a force fit in the
> hole. The idea of reinforcements around
> openings is to
> provide
> material around the
> hole to
> carry the shell
> hoop
>
> stresses that
> would
>
> otherwise have passed through the
>
> material in the opening, such that you
> don't increase
> the
> nominal shell
> stress. This requires a
> (relatively)
> smooth load
> path to redirect
>
> stress
> around the hol!
> e.
> Br!
> ian
> recently
> asked me
> about the
> effectiveness of reinforcements
>
> like perpendicular flanges lining the hole,
>
> and this is a
> bit complicated, because
>
> some
> stress i!
> s
> indeed
>
>
> redirected into
> such a flange, but the load
> is not evenly
>
>
> distributed as you move inboar!
> d or
> outboard away from the
>
> hull
> shell (with
>
> diminishing returns at
> increasing
>
> distances),
> and you also introduce a stress
> concentration
> at
> the
> perpendicular
> transition. Ideally,
> reinforcements
> should
> be an effective
>
> thickening of the hull in the region
>
> immediately adjacent to
> the opening, tapered
> smoothly
> back
> (something
> like 4:1) into the hull
>
> shell to provide
> a
>
> continuous load path
>
> with
> no stress
> concentrations at abrupt
>
>
> changes in geometry.
> Sean
>
>
>
>
>
>
> On
> January 10, 2015 8:25:39
> !
>
>
> AM MST, hank pronk via
> Personal_Submersibles
>
> <personal_submersibles at psubs.org>
>
> wrote:
> Is it feasible to
>
> have a
> bolt in penetration in a 3 inch
> thick sphere
> hull. I am
>
> picturing machining a hole
> in
> the hull,
> then
> inserting a
> window housing
> with a shoulder(flange) that fits tight in
>
> the hole and is bolted
> in
> place. Can that arrangement
> act
> as reinforcement for
> the hul!
> l.
>
> Hank
>
>
>
>
> Personal_Submersibles
> mailing list
>
>
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
> -----Inline Attachment
>
> Follows-----
>
>
> Personal_Submersibles
>
> mailing list
>
>
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
> -----Inline Attachment
> Follows-----
>
>
> Personal_Submersibles
> mailing list
>
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
> -----Inline Attachment
> Follows-----
>
>
>
> Personal_Submersibles mailing list
>
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
> -----Inline Attachment Follows-----
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
>_______________________________________________
>Personal_Submersibles mailing list
>Personal_Submersibles at psubs.org
>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20150110/556dc8fa/attachment-0001.html>
More information about the Personal_Submersibles
mailing list