<table cellspacing="0" cellpadding="0" border="0"><tr><td valign="top">Marc,<br/><br/>That's an amazing file repository, I just bookmarked it, thanks!<br/><br/>Joe<a href="http://overview.mail.yahoo.com?.src=iOS"><br/><br/>Sent from Yahoo Mail for iPad</a></td></tr></table> <div id="_origMsg_">
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<span style="font-weight:bold">From:</span>
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Marc de Piolenc <piolenc@archivale.com>; <br>
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<personal_submersibles@psubs.org>; <br>
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<span style="font-weight:bold">Subject:</span>
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Re: [PSUBS-MAILIST] Hull Transitions <br>
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Mon, Jan 6, 2014 12:51:36 AM <br>
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<td valign="top">Many ASME publications, including the Boiler and Pressure Vessel Code, <br clear="none">are available on the BitTorrent network. Get a BitTorrent client like <br clear="none">uTorrent and install it, then start searching. A good place to find <br clear="none">technical material is btdigg.org.<br clear="none"><br clear="none">Marc de Piolenc<br clear="none"><br clear="none">On 1/5/2014 2:28 PM, Joe Perkel wrote:<br clear="none">> Alec,<br clear="none">><br clear="none">> It appears that the ASME texts are not so readily available for perusal<br clear="none">> and come at significant cost. I think then that's its fair to say that<br clear="none">> it is simply not important enough for me to consider further and just<br clear="none">> stick with the template I have on hand, which is the K-350's end capped<br clear="none">> cylinder, simple enough I should think.<br
clear="none">><br clear="none">> Thanks for the well described analysis, that alone is quite helpful.<br clear="none">><br clear="none">> Joe<br clear="none">><br clear="none">> Sent from Yahoo Mail for iPad <<a shape="rect" href="http://overview.mail.yahoo.com?.src=iOS" target="_blank">http://overview.mail.yahoo.com?.src=iOS</a>><br clear="none">><br clear="none">><br clear="none">> ------------------------------------------------------------------------<br clear="none">> *From: * Alec Smyth <<a shape="rect" ymailto="mailto:alecsmyth@gmail.com" href="javascript:return">alecsmyth@gmail.com</a>>;<br clear="none">> *To: * Personal Submersibles General Discussion<br clear="none">> <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="javascript:return">personal_submersibles@psubs.org</a>>;<br clear="none">> *Subject: * Re: [PSUBS-MAILIST] Hull Transitions<br clear="none">> *Sent:
* Sun, Jan 5, 2014 3:05:48 AM<br clear="none">><br clear="none">> A transition from cylinder to cone is a major stress point, particularly<br clear="none">> if we're speaking of the transition at the larger end of the cone. If<br clear="none">> you visualize which way the plate on each side of the discontinuity will<br clear="none">> flex under pressure, you will see they are rotating in opposite<br clear="none">> directions around the point they are joined, and this means they will<br clear="none">> try to "split open" the weld by increasing the angle at which they<br clear="none">> intersect. I'm aware of three approaches to address the problem:<br clear="none">><br clear="none">> 1 - Weld it as if it were a normal cylinder to endcap transition. This<br clear="none">> of course will work, but the difficulty is determining up to what<br clear="none">> pressure it will work. The standard math (e.g.
ABS spreadsheet) will not<br clear="none">> take the discontinuity into account. Stiffening the cone as if it were a<br clear="none">> cylinder can limit the flexing of the cone, and I've seen diagrams of<br clear="none">> stiffeners placed directly on the discontinuity. See for instance Figure<br clear="none">> 1 on the ABS spreadsheet.<br clear="none">><br clear="none">> 2 - Use a curved transition piece, similar to the knuckle of a regular<br clear="none">> endcap.<br clear="none">><br clear="none">> 3 - Use a forged ring for the transition piece. This puts a whole lot<br clear="none">> more material at the discontinuity, since we're now talking a roughly<br clear="none">> triangular section rather than plate.<br clear="none">><br clear="none">> Obviously #2 and #3 are MUCH more expensive than #1 but will also get<br clear="none">> you much deeper. I don't have any easy math to tell you how much,
you<br clear="none">> would want to do FEA on it for sure, whichever of the three approaches<br clear="none">> you took.<br clear="none">><br clear="none">><br clear="none">> Best,<br clear="none">><br clear="none">> Alec<br clear="none">><br clear="none">><br clear="none">> On Sat, Jan 4, 2014 at 8:34 PM, Joe Perkel <<a shape="rect" ymailto="mailto:josephperkel@yahoo.com" href="javascript:return">josephperkel@yahoo.com</a><br clear="none">> <javascript:return>> wrote:<br clear="none">><br clear="none">> Busby is unclear as to how a transition from cylinder to cone is<br clear="none">> accomplished (fabricated). Ala PC 14 for example. Is the weld joint<br clear="none">> reinforced or is it simply an abrupt change in angle?<br clear="none">><br clear="none">> The issue is relevant in an attempt to reduce volume within the<br clear="none">> pressure hull where
only machinery/equipment is intended to reside.<br clear="none">><br clear="none">> Is there a text or diagram somewhere that covers such transitions?<br clear="none">><br clear="none">> Thanks<br clear="none">><br clear="none">> Joe<br clear="none">><br clear="none">> Sent from Yahoo Mail for iPad <<a shape="rect" href="http://overview.mail.yahoo.com?.src=iOS" target="_blank">http://overview.mail.yahoo.com?.src=iOS</a>><br clear="none">><br clear="none">><br clear="none">> _______________________________________________<br clear="none">> Personal_Submersibles mailing list<br clear="none">> <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="javascript:return">Personal_Submersibles@psubs.org</a> <javascript:return><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">><br clear="none">><br clear="none">><br clear="none">><br clear="none">> _______________________________________________<br clear="none">> Personal_Submersibles mailing list<br clear="none">> <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="javascript:return">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">><br clear="none"><br clear="none">-- <br clear="none">Archivale catalog: <a shape="rect" href="http://www.archivale.com/catalog" target="_blank">http://www.archivale.com/catalog</a><br clear="none">Polymath weblog: <a shape="rect" href="http://www.archivale.com/weblog"
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