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Re: [PSUBS-MAILIST] OSS (Pressure hull)
Andy,
For steelqualities you can have a look at
http://www.matweb.com/index.asp?ckck=1.
Thijs
----- Original Message -----
From: "Andy Jensen" <drewacard@charter.net>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, February 11, 2003 11:16 PM
Subject: Re: [PSUBS-MAILIST] OSS (Pressure hull)
>
> I have been looking at making a spherical sub from
> Hemispherical heads I like the use of space for the
> elliptical heads
> I found a PDF from www.edmontonexchanger.com called "EdEx
> Head Specs.pdf" it gave me a starting point for dreaming.
> i have been using SA 516 Grade 70 as the material i use
> for the math,I am not sure if this would be a good steel
> it is as close SA 517 as i could find.
>
> Ideas?
>
> Andy
>
> On Tue, 11 Feb 2003 22:43:05 +0100
> "Thijs Struijs" <thijs-struijs@planet.nl> wrote:
> >Pierre,
> >
> >Good idea for the OSS pressure hull.
> >
> >These endcaps can be bought. There are probably some
> >standard dimensions
> >because they need special tools to make them. At this
> >moment i did not
> >contact any manufacturers at all because when i do, i
> >want to know what i am
> >talking about. You don't get a second chance meeting
> >someone for the firts
> >time. I do know there are standard relations between
> >diameter and radii. For
> >more information you can have a look at these websites:
> >
> >http://www.bakertankhead.com/products.htm (USA)
> >
> >http://www.afflerbach.de/html/default.htm (Germany)
> >
> >http://www.antonius.nl/antonius/home/products.asp?lang=English
> >(Netherlands)
> >
> >Greetings,
> >
> >Thijs Struijs
> >
> >
> >
> >----- Original Message -----
> >From: "Pierre Poulin" <pipo305@hotmail.com>
> >To: <personal_submersibles@psubs.org>
> >Sent: Tuesday, February 11, 2003 1:47 PM
> >Subject: RE: [PSUBS-MAILIST] OSS (Pressure hull)
> >
> >
> >> Hey, OSS group!
> >>
> >> How about using that hull for the project? It look
> >>simple and could have
> >two
> >> persons side by side. Like the Cousteau thing.
> >>
> >> Also, are those end-caps available or do you have to
> >>build them from
> >> scratch?
> >>
> >> Bye, Bye!
> >>
> >> Pierre Poulin
> >> "I'm skating instead of diving!"
> >>
> >>
> >>
> >>
> >> >From: "Alec Smyth" <Asmyth@changepoint.com>
> >> >Reply-To: personal_submersibles@psubs.org
> >> >To: <personal_submersibles@psubs.org>
> >> >Subject: RE: [PSUBS-MAILIST] Pressure hull
> >> >Date: Mon, 10 Feb 2003 16:42:50 -0500
> >> >
> >> >Thijs,
> >> >
> >> >I love the simplicity of a hull made from simply two
> >>endcaps. I thought
> >> >mine would be simple enough as it is basically a
> >>reinforced pipe, yet
> >> >welding two elliptical heads like this would have saved
> >>me at least 6
> >> >months work, or more. The reason is you would not have
> >>to contend with a
> >> >cylinder which is never quite round when you receive
> >>it, and getting
> >round
> >> >rings into an oval cylinder was the hardest thing on
> >>the whole project so
> >> >far. The part I would worry about is that you have
> >>inserts that cross the
> >> >join between the two halves. Not that it can't be done,
> >>but it introduces
> >> >what to me at any rate are unknowns in the stress
> >>calculations. I try to
> >> >use only things that I can calculate.
> >> >
> >> >Besides Cousteau's saucer, there is another sub out
> >>there based on this
> >> >principle of joining two elliptical heads.
> >>Unfortunately I can't recall
> >its
> >> >name, but I remember seeing a picture of it online
> >>somewhere, hanging
> >from
> >> >a crane and painted white and orange. If anyone can
> >>recall the sub I'm
> >> >referring to, you might find it a neat idea. What they
> >>did was incline
> >the
> >> >"saucer". It was oriented in a horizontal plane like
> >>Cousteau's, except
> >it
> >> >was also inclined "up hill" about 30-45 degrees. While
> >>this might seem
> >odd,
> >> >they also had an exostructure that faired it. The lower
> >>head had two
> >bubble
> >> >windows facing forward, but as the saucer was inclined,
> >>these two windows
> >> >did not have to cross the weld between the two heads.
> >>The occupants
> >> >traveled lying down and the hatch was of course on the
> >>upper shell.
> >> >
> >> >rgds,
> >> >
> >> >Alec
> >> >
> >> >
> >> > -----Original Message-----
> >> >From: Thijs Struijs [mailto:thijs-struijs@planet.nl]
> >> >Sent: Sunday, February 09, 2003 12:02 PM
> >> >To: PSUBS
> >> >Subject: [PSUBS-MAILIST] Pressure hull
> >> >
> >> >
> >> >
> >> >To all,
> >> >
> >> >I would like some reactions on a drawing i made a while
> >>ago. You can find
> >> >it at:
> >http://www.prismnet.com/~moki/20030126.073208/doubleXendXcapX.jpg
> >> >.
> >> >The idea is to construct a very simple pressure hull
> >>out of two
> >> >torispherical endcaps. The conning "tower" is made out
> >>of a standard line
> >> >pipe with a little overdimensioned wallthickness and
> >>the smallest
> >possible
> >> >diameter. The endcaps are made with a small cilindrical
> >>section on it but
> >i
> >> >am afraid that the tower will intersect with the
> >>torispherical part.
> >> >In order to keep it simple i chose a very common steel
> >>for the endcaps.
> >It
> >> >is P265GH (yield strenght 265 n/mm^2, 38500 psi,
> >>tensile strenght 410
> >> >n/mm^2, 59500 psi). This is an "off the shelf" material
> >>at Afflerbach,
> >the
> >> >german manufacturer. I think you could call it soft
> >>boiler steel.
> >> >To calculate the strenght of it (apart from the
> >>conningtower and
> >viewports)
> >> >one can use the formulas for a sphere, using the
> >>dishing radius of the
> >> >endcap (in this case 1040 mm). Maybe it is my age, to
> >>much alcohol or
> >lack
> >> >of intelligence but watever method i use (ABS, Lloyd's
> >>or an old pressure
> >> >vessel codebook) i get different outcommings. Can
> >>anyone of you say
> >> >something sensible on this? I am considdering a
> >>wallthickness of 12 mm,
> >> >divingdepth 100 mtr?
> >> >If it is ever going to be build it will be tested
> >>unmanned to a depth 50%
> >> >more than its safe working depth. Should it collapse i
> >>will hold no one
> >> >responsible for that. So please be free to give your
> >>advise.
> >> >
> >> >Thank you very much,
> >> >
> >> >Thijs Struijs
> >> >
> >>
> >>
> >> _________________________________________________________________
> >> MSN Search, le moteur de recherche qui pense comme vous
> >>!
> >> http://fr.ca.search.msn.com/
> >>
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