<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div><span>Cliff,</span></div><div id="yui_3_16_0_ym19_1_1498957842693_3160" dir="ltr"><span id="yui_3_16_0_ym19_1_1498957842693_3187">That is exactly what I did, I put the tank specs in the unstiffened cylinder program. The only problem is, I can not find the exact material the steel tanks are made from. I am assuming same steel and gives a good estimate.</span></div><div id="yui_3_16_0_ym19_1_1498957842693_3160" dir="ltr"><span>Thanks Cliff</span></div><div id="yui_3_16_0_ym19_1_1498957842693_3160" dir="ltr"><span>Hank</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Saturday, July 1, 2017 6:05 PM, via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv2484074644"><div><div>Most of the FEA packages associated with 3-d modeling software use a linear model. You would need an FEA tool that can model buckling to study this. An alternative is to use the ABS stress analysis spreadsheet with no stiffeners. This would give a conserative crush depth.</div><div id="yiv2484074644AppleMailSignature"><br clear="none"></div><div id="yiv2484074644AppleMailSignature">Cliff</div><div id="yiv2484074644AppleMailSignature"><br clear="none"><br clear="none"><div>Cliff Redus</div></div><div><div class="yiv2484074644yqt7986811274" id="yiv2484074644yqtfd49964"><br clear="none">On Jul 1, 2017, at 2:27 PM, Scott Waters via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div></div><div class="yiv2484074644yqt7986811274" id="yiv2484074644yqtfd18492"><blockquote type="cite"><div></div></blockquote></div></div><div class="yiv2484074644yqt7986811274" id="yiv2484074644yqtfd57664"><div><div>I am unsure of the depth rating of an empty scuba tank. It could be easily found out on a solidworks simulation.</div><div>Thanks,</div><div>Scott</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div id="yiv2484074644composer_signature"><div style="font-size:85%;color:#575757;">Sent from my U.S. Cellular® Smartphone</div></div><div><br clear="none"></div><div style="font-size:100%;color:#000000;"><div>-------- Original message --------</div><div>From: hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div>Date: 7/1/17 12:34 PM (GMT-05:00) </div><div>To: Personal Submersibles General Discussion <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div>Subject: Re: [PSUBS-MAILIST] O2 tanks </div><div><br clear="none"></div></div>Thanks' Scott,Do you know what the max depth rating for an empty Scuba O2 tank is. I suppose you could increase the rating by using only part of the volume and leave pressure inside them. A sub could carry several in that case since they are close to neutral buoyant. Hank <br clear="none"><br clear="none"> On Saturday, July 1, 2017 8:25 AM, Scott Waters via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"> <br clear="none"><br clear="none"> Hank,Alvin has all the O2 supply internally. Pisces has the mission O2 internally and emergency supply externally in special steel cylinders that are pressure tested to 1.25 max depth while empty.Thanks,Scott Waters<br clear="none"><br clear="none"><br clear="none">Sent from my U.S. Cellular® Smartphone<br clear="none">-------- Original message --------From: hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> Date: 7/1/17 9:59 AM (GMT-05:00) To: Personal Submersibles General Discussion <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> Su<blockquote type="cite"><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br clear="none"></div></blockquote></div></div></div><div class="yqt7986811274" id="yqtfd52174">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>