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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
>> >
>>
>>
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