<br>The failure pressure is governed by the wall thickness to diameter ratio, plus the end conditions (bulkheads) for buckling modes. Longer tubes will be less stable, so you want it just long enough to accommodate your camera.<br><br>I don't know what sort of condition your acrylic tubing comes in, but if you're cutting / machining it, I'd be inclined to anneal it if you can do so easily. Even if there is no issue with the hydrostatic pressure performance, annealing will give you a better chance of surviving an accidental impact when the tube is already stressed.<br><br>Sean<br><br>-------- Original Message --------<br>On Nov. 1, 2020, 04:25, hank pronk via Personal_Submersibles < personal_submersibles@psubs.org> wrote:<blockquote class="protonmail_quote"><br><html><head></head><body><div class="ydp1a7405e7yahoo-style-wrap" style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 13px;"><div></div>
<div dir="ltr" data-setdir="false">David, I am just amazed how strong that acrylic is. Of coarse the small diameter is critical. The tube is 1\8 wall.</div><div dir="ltr" data-setdir="false">Hank</div><div><br></div>
</div><div id="yahoo_quoted_4391867734" class="yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
<div>
On Saturday, October 31, 2020, 11:51:32 PM MDT, David Colombo via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id="yiv2722136856"><div><div>Hank, that's impressive. How thick was the wall of the acrylic tube?<div>David</div></div><br clear="none"><div class="yiv2722136856gmail_quote"><div class="yiv2722136856yqt2275317314" id="yiv2722136856yqt54126"><div class="yiv2722136856gmail_attr" dir="ltr">On Sat, Oct 31, 2020, 4:25 PM 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>> wrote:<br clear="none"></div><blockquote class="yiv2722136856gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr"><span><a rel="nofollow" shape="rect" target="_blank" href="https://www.youtube.com/watch?v=OL-0z9Rl8jo"></a></span><div><br clear="none"></div><div id="yiv2722136856m_-4490568393370295584ydpbd3bc260enhancr_card_5082852714" style="max-width:400px;font-family:YahooSans, Helvetica, Arial, sans-serif;"><a rel="nofollow" shape="rect" target="_blank" href="https://www.youtube.com/watch?v=OL-0z9Rl8jo" style="text-decoration:none!important;color:#000!important;"><table border="0" cellpadding="0" cellspacing="0" style="max-width:400px;"><tbody><tr><td colspan="1" rowspan="1" width="400"><table border="0" cellpadding="0" cellspacing="0" width="100%" style="max-width:400px;border-width:1px;border-style:solid;border-color:rgb(224,228,233);border-radius:2px;"><tbody><tr><td colspan="1" rowspan="1" valign="top" background="https://s.yimg.com/lo/api/res/1.2/MebH82gwILKOW2GF_yPaFA--~A/Zmk9ZmlsbDt3PTQwMDtoPTIwMDthcHBpZD1pZXh0cmFjdA--/https://i.ytimg.com/vi/OL-0z9Rl8jo/hqdefault.jpg.cf.jpg" bgcolor="#000000" height="175" style="background-color:rgb(0,0,0);background-size:cover;border-top-left-radius:2px;border-top-right-radius:2px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;min-height:175px;"><table border="0" cellpadding="0" cellspacing="0" style="width:100%;"><tbody><tr><td colspan="1" rowspan="1" valign="top" background="https://s.yimg.com/cv/ae/nq/storm/assets/enhancrV21/1/enhancr_gradient-400x175.png" bgcolor="transparent" style="background-color:transparent;border-top-left-radius:2px;border-top-right-radius:2px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;min-height:175px;"><table border="0" height="175" style="width:100%;min-height:175px;"><tbody><tr><td colspan="1" rowspan="1" style="text-align:left;padding:15px 0 0 15px;vertical-align:top;"></td><td colspan="1" rowspan="1" style="text-align:right;padding:15px 15px 0 0;vertical-align:top;"><div></div></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td colspan="1" rowspan="1"><table align="center" border="0" cellpadding="0" cellspacing="0" style="background:#fff;width:100%;max-width:400px;border-radius:0 0 2px 2px;border-top:1px solid rgb(224,228,233);"><tbody><tr><td colspan="1" rowspan="1" style="background-color:#ffffff;padding:16px 0 16px 12px;vertical-align:top;border-radius:0 0 0 2px;"><img src="https://s.yimg.com/nq/storm/assets/enhancrV2/23/logos/youtube.png" height="36" style="min-width:36px;margin-top:3px;"></td><td colspan="1" rowspan="1" style="vertical-align:middle;padding:12px 24px 16px 12px;width:99%;font-family:YahooSans, Helvetica, Arial, sans-serif;border-radius:0 0 2px 0;"><h2 style="font-size:14px;line-height:19px;margin:0px 0px 6px;font-family:YahooSans, Helvetica, Arial, sans-serif;color:rgb(38,40,42);max-width:314px;">Pressure Testing Camera Housing For New ROV Project</h2><p style="font-size:12px;line-height:16px;margin:0px;color:rgb(151,155,167);"></p></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table></a></div><div dir="ltr">My new fly out ROV project.</div><div><br clear="none"></div><br clear="none"></div></div></div>_______________________________________________<br clear="none">
Personal_Submersibles mailing list<br clear="none">
<a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">
<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><br clear="none">
</blockquote></div></div></div></div><div class="yqt2275317314" id="yqt06526">_______________________________________________<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></div>
</div>
</div></body></html></div>