<font color='black' size='3' face='Arial, Helvetica, sans-serif'><font class="Apple-style-span" size="3">Alvin's new hull could not be built to ABS specs due to the ridiculous standards required for such a pressure vessel. The hull is Navy certified and the rest of the boat is ABS and Navy combined.</font>
<div><font class="Apple-style-span" size="3">Vance<br>
</font><br>
<br>
<div style="font-family: helvetica, arial; font-size: 10pt; color: black; ">-----Original Message-----<br>
From: Jon Wallace <jonw@psubs.org><br>
To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>
Sent: Wed, Apr 9, 2014 9:17 pm<br>
Subject: Re: [PSUBS-MAILIST] New submarine<br>
<br>
<div id="AOLMsgPart_2_628d2e10-9806-4556-ba9f-6c215c1a52fe">
<div class="aolReplacedBody" bgcolor="#FFFFFF" text="#000000">
<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 type="cite">
<div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:14pt">
<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>
<div><br>
</div>
<div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 14pt;">
<div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;">
<div dir="ltr">
<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>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<br>
</div>
</div>
<div id="AOLMsgPart_3_628d2e10-9806-4556-ba9f-6c215c1a52fe" style="margin: 0px;font-family: Tahoma, Verdana, Arial, Sans-Serif;font-size: 12px;color: #000;background-color: #fff;">
<pre style="font-size: 9pt;"><tt>_______________________________________________
Personal_Submersibles mailing list
<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a>
<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a>
</tt></pre>
</div>
<!-- end of AOLMsgPart_3_628d2e10-9806-4556-ba9f-6c215c1a52fe -->
</div>
</div>
</font>