<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>Hi Paul,</DIV><DIV> On your web site it says "The 3300/3 program has been dogged by acrylic manufacturing problems" , do you mind if I ask what problems you encountered" ?</DIV><DIV> </DIV><DIV>Brian<BR><BR>--- paul@steel-fish.com wrote:<BR><BR>From: "Paul Moorhouse" <paul@steel-fish.com><BR>To: "'PSUBS Member Discussion Group'" <member-forum@psubs.org><BR>Subject: Re: [Member-Forum] Moment of Inertia<BR>Date: Tue, 25 Mar 2014 09:10:06 -0000<BR><BR></DIV><DIV><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Joe</SPAN></P></DIV><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">As it happens, this is my day job. I have been designing submarine pressure vessels for the last 28 years. I am sure there are others on the forum who do this but I am happy to help if you would like, and others at PSUBS should the need arise. </SPAN></P></DIV><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Frame size and spacing is inter-related and there is no one answer. I have developed some models based on the European pressure vessel code PD5500 so running a new configuration is easy and surprisingly quick. PD5500 produces much lighter vessels than ASME VIII which is really aimed at chemical plant. In this way it is more similar to military codes but it does rely on quality assurance levels that do not generally come with home construction. So to cater for this, you put a factor in. I apologise in advance for all of the calculations being in metric but give me info in either. </SPAN></P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">I would need to know</SPAN></P><P style="text-indent: -18pt; margin-left: 38.4pt; mso-list: l0 level1 lfo1;"><SPAN style="color: rgb(31, 73, 125); font-family: Symbol; font-size: 11pt;"><SPAN style="mso-list: Ignore;">·<SPAN style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;"> </SPAN></SPAN></SPAN><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Outside diameter</SPAN></P><P style="text-indent: -18pt; margin-left: 38.4pt; mso-list: l0 level1 lfo1;"><SPAN style="color: rgb(31, 73, 125); font-family: Symbol; font-size: 11pt;"><SPAN style="mso-list: Ignore;">·<SPAN style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;"> </SPAN></SPAN></SPAN><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Shell thickness</SPAN></P><P style="text-indent: -18pt; margin-left: 38.4pt; mso-list: l0 level1 lfo1;"><SPAN style="color: rgb(31, 73, 125); font-family: Symbol; font-size: 11pt;"><SPAN style="mso-list: Ignore;">·<SPAN style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;"> </SPAN></SPAN></SPAN><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Shell material </SPAN></P><P style="text-indent: -18pt; margin-left: 38.4pt; mso-list: l0 level1 lfo1;"><SPAN style="color: rgb(31, 73, 125); font-family: Symbol; font-size: 11pt;"><SPAN style="mso-list: Ignore;">·<SPAN style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;"> </SPAN></SPAN></SPAN><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Frame material</SPAN></P><P style="text-indent: -18pt; margin-left: 38.4pt; mso-list: l0 level1 lfo1;"><SPAN style="color: rgb(31, 73, 125); font-family: Symbol; font-size: 11pt;"><SPAN style="mso-list: Ignore;">·<SPAN style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;"> </SPAN></SPAN></SPAN><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Diving depth</SPAN></P><P style="text-indent: -18pt; margin-left: 38.4pt; mso-list: l0 level1 lfo1;"><SPAN style="color: rgb(31, 73, 125); font-family: Symbol; font-size: 11pt;"><SPAN style="mso-list: Ignore;">·<SPAN style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;"> </SPAN></SPAN></SPAN><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Length of parallel body</SPAN></P><P style="text-indent: -18pt; margin-left: 38.4pt; mso-list: l0 level1 lfo1;"><SPAN style="color: rgb(31, 73, 125); font-family: Symbol; font-size: 11pt;"><SPAN style="mso-list: Ignore;">·<SPAN style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;"> </SPAN></SPAN></SPAN><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Ends, hemi or 2:1 dished.</SPAN></P><P style="text-indent: -18pt; margin-left: 38.4pt; mso-list: l0 level1 lfo1;"><SPAN style="color: rgb(31, 73, 125); font-family: Symbol; font-size: 11pt;"><SPAN style="mso-list: Ignore;">·<SPAN style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;"> </SPAN></SPAN></SPAN><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Preferred frame spacing </SPAN></P><P style="text-indent: -18pt; margin-left: 38.4pt; mso-list: l0 level1 lfo1;"><SPAN style="color: rgb(31, 73, 125); font-family: Symbol; font-size: 11pt;"><SPAN style="mso-list: Ignore;">·<SPAN style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;"> </SPAN></SPAN></SPAN><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Inside or outside frames</SPAN></P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">I can send you the PDF of the work sheet as the PD5500 sums do look very pretty. </SPAN></P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">The next step is to design the hatch penetration and I can help you here also. </SPAN></P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;"></SPAN> </P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">This guy can thermo form your acrylic</SPAN></P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;"><A href="http://www.airesearch.nl/">http://www.airesearch.nl/</A></SPAN></P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;"></SPAN> </P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;"></SPAN> </P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Regards</SPAN></P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Paul</SPAN></P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;"></SPAN> </P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;">Paul Moorhouse</SPAN></P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;"><A href="http://www.steel-fish.com">www.steel-fish.com</A></SPAN></P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;"></SPAN> </P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;"></SPAN> </P><P><SPAN style="color: rgb(31, 73, 125); font-family: "Calibri","sans-serif"; font-size: 11pt;"></SPAN> </P><P><B><SPAN lang="EN-US" style="font-family: "Tahoma","sans-serif"; font-size: 10pt;">From:</SPAN></B><SPAN lang="EN-US" style="font-family: "Tahoma","sans-serif"; font-size: 10pt;"> Member-Forum [mailto:member-forum-bounces@psubs.org] <B>On Behalf Of </B>Joe Perkel<BR><B>Sent:</B> 25 March 2014 03:55<BR><B>To:</B> PSUBS Member Discussion Group<BR><B>Subject:</B> [Member-Forum] Moment of Inertia</SPAN></P><P> <DIV></DIV><TABLE border="0" cellspacing="0" cellpadding="0"><TBODY><TR><TD valign="top" style="padding: 0cm;"><P>Where did I see the rule of thumb for T-section rib sizing relative to shell thickness? I can't seem to find it now.<BR><BR>Joe<A href="http://overview.mail.yahoo.com?.src=iOS"><BR><BR>Sent from Yahoo Mail for iPad</A><DIV></DIV></P></TD></TR></TBODY></TABLE></P><P><SPAN style="font-family: "Calibri","sans-serif"; font-size: 10pt;"></SPAN> _______________________________________________
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