<html><head></head><body><p dir="ltr">If the university doesn't have the info, it should at least be traceable. All vessels built to ASME Section VIII Division 1 require a nameplate that will list the manufacturer, serial number, etc. Failing that, metallurgical tests are possible, but a bit more involved.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On January 10, 2015 12:54:26 PM MST, hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail">Sean,<br />Is there a on site test that can be done to determine the alloy? <br />Hank<br /><hr /><br />On Sat, 1/10/15, Sean T. Stevenson via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br /><br /> Subject: Re: [PSUBS-MAILIST] bolt in penetration<br /> To: "Personal Submersibles General Discussion" <personal_submersibles@psubs.org><br /> Received: Saturday, January 10, 2015, 2:46 PM<br /> <br /> Parallel projects... Sister subs... Could be<br /> fun.<br /> Sean<br /> <br /> <br /> <br /> <br /> On January 10, 2015<br /> 12:19:38 PM MST, hank pronk via Personal_Submersibles<br /> <personal_submersibles@psubs.org> wrote:<br /> <br /> Yes but<br /> there two of them.<br /> Hank<br /> On Sat, 1/10/15, Sean T. Stevenson via<br /> Personal_Submersibles<br /> <personal_submersibles@psubs.org> wrote:<br /> <br /> Subject: Re: [PSUBS-MAILIST]<br /> bolt in penetration<br /> To: "Personal<br /> Submersibles General
Discussion"<br /> <personal_submersibles@psubs.org><br /> <br /> Received: Saturday, January 10, 2015, 2:16 PM<br /> <br /> If it is suitable, I presume<br /> you're calling<br /> dibs?<br /> <br /> Sean<br /> <br /> <br /> <br /> <br /> <br /> On January 10, 2015<br /> 12:10:14 PM MST, hank pronk via<br /> Personal_Submersibles<br /> <br /> <personal_submersibles@psubs.org> wrote:<br /> <br /> Sean,<br /> I may<br /> be able to on Monday. The sphere was<br /> owned<br /> by a university and we can contact them to find the<br /> manufacturer. Given that is was used as a<br /> pressure vessel<br /> paid for by a university<br /> working on a government project, I<br /> have to<br /> assume it is good stuff. Not very scientific but a<br /> fair assumption at!<br /> this<br /> stage. Luckily it is right in<br /> Brian's<br /> back yard in California so he was able to look<br /> at it and might be able to do some detective<br /> work.<br /> <br />
Hank<br /> On Sat, 1/10/15, Sean T. Stevenson via<br /> Personal_Submersibles<br /> <br /> <personal_submersibles@psubs.org> wrote:<br /> <br /> Subject: Re:<br /> [PSUBS-MAILIST]<br /> bolt in penetration<br /> To: "Personal<br /> <br /> Submersibles General Discussion"<br /> <br /> <personal_submersibles@psubs.org><br /> <br /> Received: Saturday, January 10, 2015, 2:02<br /> PM<br /> <br /> Hank, any chance you<br /> can<br /> find out what the alloy<br /> is? This will have<br /> a<br /> profound effect on its efficacy.<br /> Sean<br /> <br /> <br /> <br /> <br /> On!<br /> <br /> January<br /> 10, 2015<br /> 11:51:22<br /> AM MST, hank pronk via<br /> <br /> Personal_Submersibles<br /> <br /> <br /> <personal_submersibles@psubs.org> wrote:<br /> <br /> Sean, <br /> <br /> <br /> Thank you, that is helpful. My idea was<br /> to<br /> <br /> make the insert as t!<br /> ight as<br /> possible (sweat it in) I am<br />
not<br /> sure if the difference in material<br /> would cause a problem<br /> <br /> though. The idea of<br /> seating the port into<br /> the shell a good<br /> <br /> option<br /> also. I am just chewing the fat here, I have<br /> enough<br /> on my plate but it is<br /> fun to think<br /> about. I was wrong about<br /> the size, the<br /> sphere is 6<br /> feet and I wrote 60 in. I imagine<br /> that<br /> kills the rating quite a bit?<br /> Hank<br /> On Sat, 1/10/15,<br /> Sean T.<br /> Stevenson via Personal_Submersibles<br /> <br /> <personal_submersibles@psubs.org><br /> <br /> wrote:<br /> <br /> Subject: Re:<br /> [PSUBS-MAILIST]<br /> bolt in<br /> penetration<br /> To: "Personal<br /> <br /> Submersibles General<br /> Discussion"<br /> <br /> <br /> <personal_submersibles@psubs.org><br /> <br /> <br /> Received: Saturday, January 10, 2015!<br /> , 1:40<br /> PM<br /> <br /> <br /> You could certainly<br />
do<br /> that,<br /> although a three inch<br /> thick shell is pretty<br /> !<br /> <br /> <br /> substantial - I might consider<br /> <br /> machining<br /> eg. conical window<br /> seats in the<br /> hull sh!<br /> <br /> ell<br /> directly,<br /> and then<br /> derating the hull<br /> to a depth<br /> whereby the<br /> actual hull<br /> <br /> thickness is the effective<br /> derated thickness<br /> plus the effective<br /> reinforcement, which<br /> just<br /> <br /> happens to be a<br /> <br /> <br /> contiguous shell. The<br /> bolt-in<br /> arrangement<br /> would not act as<br /> hull<br /> <br /> <br /> reinforcement though - unless it was a force fit in the<br /> hole. The idea of reinforcements around<br /> openings is to<br /> provide<br /> material around the<br /> hole to<br /> carry the shell<br /> hoop<br /> <br /> stresses that<br /> would<br /> <br /> otherwise have passed through the<br /> <br />
material in the opening, such that you<br /> don't increase<br /> the<br /> nominal shell<br /> stress. This requires a<br /> (relatively)<br /> smooth load<br /> path to redirect<br /> <br /> stress<br /> around the hol!<br /> e.<br /> Br!<br /> ian<br /> recently<br /> asked me<br /> about the<br /> effectiveness of reinforcements<br /> <br /> like perpendicular flanges lining the hole,<br /> <br /> and this is a<br /> bit complicated, because<br /> <br /> some<br /> stress i!<br /> s<br /> indeed<br /> <br /> <br /> redirected into<br /> such a flange, but the load<br /> is not evenly<br /> <br /> <br /> distributed as you move inboar!<br /> d or<br /> outboard away from the<br /> <br /> hull<br /> shell (with<br /> <br /> diminishing returns at<br /> increasing<br /> <br /> distances),<br /> and you also introduce a stress<br /> concentration<br /> at<br /> the<br /> perpendicular<br /> transition. Ideally,<br />
reinforcements<br /> should<br /> be an effective<br /> <br /> thickening of the hull in the region<br /> <br /> immediately adjacent to<br /> the opening, tapered<br /> smoothly<br /> back<br /> (something<br /> like 4:1) into the hull<br /> <br /> shell to provide<br /> a<br /> <br /> continuous load path<br /> <br /> with<br /> no stress<br /> concentrations at abrupt<br /> <br /> <br /> changes in geometry.<br /> Sean<br /> <br /> <br /> <br /> <br /> <br /> <br /> On<br /> January 10, 2015 8:25:39<br /> !<br /> <br /> <br /> AM MST, hank pronk via<br /> Personal_Submersibles<br /> <br /> <personal_submersibles@psubs.org><br /> <br /> wrote:<br /> Is it feasible to<br /> <br /> have a<br /> bolt in penetration in a 3 inch<br /> thick sphere<br /> hull. I am<br /> <br /> picturing machining a hole<br /> in<br /> the hull,<br /> then<br /> inserting a<br /> window housing<br /> with a shoulder(flange)
that fits tight in<br /> <br /> the hole and is bolted<br /> in<br /> place. Can that arrangement<br /> act<br /> as reinforcement for<br /> the hul!<br /> l.<br /> <br /> Hank<br /> <br /> <br /> <br /> <br /> Personal_Submersibles<br /> mailing list<br /> <br /> <br /> Personal_Submersibles@psubs.org<br /> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br /> <br /> <br /> -----Inline Attachment<br /> <br /> Follows-----<br /> <br /> <br /> Personal_Submersibles<br /> <br /> mailing list<br /> <br /> <br /> Personal_Submersibles@psubs.org<br /> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br /> <br /> <br /> <br /> Personal_Submersibles mailing list<br /> Personal_Submersibles@psubs.org<br /> <a
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