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<div class="moz-cite-prefix">Wow, big difference here...ABS
calculator shows 2.5 inch thickness for 72inch sphere with maximum
working pressure of 2578 psi utilizing the ABS/ASME recommended
usage factor of .67 which takes into account material fatigue.<br>
<br>
I don't think the UnderPressure program considers usage factor.
If you discount the usage factor then the ABS calculator comes up
with 1.75 inch thickness with max working pressure of 2679 psi. A
thickness of 1.5 inches provides 2303 psi, below your 2543 psi
requirement.<br>
<br>
Jon<br>
<br>
<br>
On 4/9/2014 6:53 PM, Alan James wrote:<br>
</div>
<blockquote
cite="mid:1397083982.32806.YahooMailNeo@web120902.mail.ne1.yahoo.com"
type="cite">
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<div><span>Scott,</span></div>
<div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px;
font-family: HelveticaNeue, 'Helvetica Neue', Helvetica,
Arial, 'Lucida Grande', sans-serif; background-color:
transparent; font-style: normal;"><span>I make 1.23" thick for
a 72" ID sphere 516-70 to that depth, sea water. </span></div>
<div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px;
font-family: HelveticaNeue, 'Helvetica Neue', Helvetica,
Arial, 'Lucida Grande', sans-serif; background-color:
transparent; font-style: normal;"><span>That was on the "free"
Under Pressure program. It should be somewhere in the ball
park.</span></div>
<div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px;
font-family: HelveticaNeue, 'Helvetica Neue', Helvetica,
Arial, 'Lucida Grande', sans-serif; background-color:
transparent; font-style: normal;"><span>Alan</span></div>
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<hr size="1"> <font face="Arial" size="2"> <b><span
style="font-weight:bold;">From:</span></b>
<a class="moz-txt-link-rfc2396E" href="mailto:swaters@waters-ks.com">"swaters@waters-ks.com"</a> <a class="moz-txt-link-rfc2396E" href="mailto:swaters@waters-ks.com"><swaters@waters-ks.com></a><br>
<b><span style="font-weight: bold;">To:</span></b>
Personal Submersibles General Discussion
<a class="moz-txt-link-rfc2396E" href="mailto:personal_submersibles@psubs.org"><personal_submersibles@psubs.org></a> <br>
<b><span style="font-weight: bold;">Sent:</span></b>
Thursday, April 10, 2014 10:29 AM<br>
<b><span style="font-weight: bold;">Subject:</span></b>
Re: [PSUBS-MAILIST] New submarine<br>
</font> </div>
<div class="y_msg_container"><br>
<div id="yiv4031161811">
<div><span style="font-family: Verdana; color: rgb(0, 0,
0); font-size: 10pt;"></span>
<div>Would anyone on psubs who knows how to use CAD
run a pressure test on a simple 6' sphere with ASME
516 grade 70 steel, then again with HY-80? What are
required wall thicknesses to meet crush depth of
5709 feet (2543 psi). If you have time maybe even a
48" cylinder with ribs. </div>
<div>On a lighter note, Alec and I have been talking
about hard to find things that I can make for psub
members with my plasma robot. I am going to attempt
making a manipulator arm kit that will be
inexpensive and very functionable for our subs. I'll
post progress as it comes.</div>
<div> </div>
<div>Thanks,</div>
<div>Scott Waters</div>
<div> </div>
<br>
</div>
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