[PSUBS-MAILIST] New submarine

[Sean T. Stevenson]

If shipping cost is no object:

http://www.edmontonexchanger.com/pressure-vessel-components/overview-of-services/

Sean


On April 10, 2014 5:35:19 AM MDT, swaters <swaters at waters-ks.com> wrote:
>Awesome Alan! Thanks!
>-Scott Waters
>
>
>
>
>Sent from my U.S. Cellular© SmartphoneAlan James
><alanlindsayjames at yahoo.com> wrote:Scott,
>just did a quick Google & these people make 1.5" segmented hemispheres
>6ft in diameter.
>http://www.cmforming.com/tankheads-and-accessories.htm
>http://www.cmforming.com/pdfs/hemispherical-asme-code-type.pdf
>You may have to compromise depth to line up with what's available if
>there is a stock item
>somewhere.
>Alan
>
>
>
>From: swaters <swaters at waters-ks.com>
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>Sent: Thursday, April 10, 2014 3:37 PM
>Subject: Re: [PSUBS-MAILIST] New submarine
>
>Jon, 
>I haven't thought as far as that yet. Mostly still seeing if this
>project is even feasable still.
>Thanks,
>Scott Waters
>
>
>
>
>Sent from my U.S. Cellular© Smartphone
>
>Jon Wallace <jonw at psubs.org> wrote:
>
>As far as I'm aware, ABS doesn't deal with crush depth only maximum
>working pressure which incorporates usage factors (n), in this case of
>n=.67.  If n=1 could be considered "crush depth", then the calculator
>shows crush occurring at 2287 psi with 1.5 inch thick hemisphere and
>max working depth of 1532 psi with a usage factor of n=.67 which is
>right in the parameters that he is looking for.  The problem with using
>n=1 as an indicator of crush       depth, I believe, is that there's no
>way to guarantee it's an accurate representation of when the hull will
>fail because actual fabrication variables resulting in less than ideal
>geometric structures can lower the calculated result.  When using
>ABS/ASME       we should always be solving for max working pressure,
>not crush depth.
>
>So your observation is correct, and solving for a working depth of
>~3000 feet results in a much thinner hemisphere.  I didn't know what
>Scott was using for a safety factor so just plugged the numbers to get
>2578 psi from the ABS calculator, but that obviously is over-built for
>what Scott's intended use is.  Using a thickness of 1.25 inches, ABS is
>showing max working pressure of 1268 psi or 2849 feet, just slightly
>less than his 3000 foot requirement.
>
>Jon
>
>
>On 4/9/2014 10:08 PM, Alan James wrote:
>I'm a bit confused Jon,
>Scott was asking for             the thickness for a crush depth
>of  5709 feet (2543 psi).
>You are saying 2.5 for a maximum working pressure of 2578 psi. The
>working pressure
>I thought was the design depth or maximum operating depth.
>Alan
>
>
>
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-- 
Sent from Kaiten Mail. Please excuse my brevity.
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