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--></style></head><body bgcolor="white" lang="EN-US" link="blue" vlink="purple"><p dir="ltr">The calculation shown is using the section of the ABS rules that deals specifically with spherical shell hull components. The usage factor eta is specified by ABS as 0.67 for this calculation, which means the maximum allowable working pressure (maximum possible test depth) would be 0.67 of the critical pressure (predicted failure or crush depth). Safety factors over and above this (operating depth or actual test depth vs. maximum allowable) are left to the designer's discretion.</p>
<p dir="ltr">In which section is that temperature dependence discussed?</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On November 15, 2014 1:50:09 PM MST, Hugh Fulton 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;">
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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">For windows ABS still has very different safety factors for the different temperatures though. i.e. at 24 deg S.F. 6 at 38 deg S.F. 8 hence the query as to what you used for the 1.0 thick viewport for 500 ft test. <p></p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The other thing I have always wanted to know is what temperature are the domes rated for that DW2000 uses and that the Perrys were designed for. Hugh.<p></p></span></p><div><p class="MsoNormal"><span lang="EN-NZ" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><p> </p></span></p></div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><p> </p></span></p><div><div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>Sean T. Stevrnson via Personal_Submersibles<br /><b>Sent:</b> Saturday, 15 November 2014 2:12 p.m.<br /><b>To:</b> Personal Submersibles General Discussion<br /><b>Subject:</b> Re: [PSUBS-MAILIST] bow window<p></p></span></p></div></div><p class="MsoNormal"></p><p> </p><p>Temperature doesn't really factor in to the calculations. Technically, seawater density is a function of both temperature and salinity (and very slight compressibility), but the user just enters an average value for density. Similarly, the shell material properties can be tweaked from the average values that are programmed in as defaults, to accommodate specific known material test
values or just for increased conservatism. The calculations are assumed to be valid for any material within transition temperature limits, but no specific attempt is made to model creep in acrylic or toughness transitions in shell materials at extremely low or high temperatures. This software is just an implementation of the formulas presented in the ABS Rules. Simply put, if seawater is still liquid at your operating temperature, you're probably okay. The lack of perfect determinism at failure is why we h! ave safety factors.</p><p></p><p>Sean</p><p></p><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:windowtext"><p> </p></span></p><div><p class="MsoNormal"><span style="color:windowtext">On November 14, 2014 2:50:52 PM MST, Hugh Fulton via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<p></p></span></p><p class="MsoNormal">Sean,</p><p></p><p class="MsoNormal">That is a very sexy
programme you have there. What temp do you have as standard for that calc?</p><p></p><p class="MsoNormal">Regards, Hugh</p><p></p><div><p><span lang="EN-NZ"> <p></p></span></p></div><p> </p><p></p><div><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><b>From:</b> Personal_Submersibles [<a href="mailto:personal_submersibles-bounces@psubs.org">mailto:personal_submersibles-bounces@psubs.org</a>] <b>On Behalf Of </b>Sean T. Stevenson via Personal_Submersibles<br /><b>Sent:</b> Friday, 14 November 2014 6:45 p.m.<br /><b>To:</b> Personal Submersibles General Discussion<br /><b>Subject:</b> Re: [PSUBS-MAILIST] bow window</p><p></p></div></div><p> </p><p></p><div><p class="MsoNormal">On 2014-11-02 12:06, Vance Bradley via Personal_Submersibles wrote:</p><p></p></div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><p class="MsoNormal">Cliff, I'm thinking full hull diameter, 36" or
thereabouts.</p><p></p></div><div><p class="MsoNormal">Vance</p><p></p></div></blockquote><p class="MsoNormal"><br />Vance - I was running some hull calcs for Brian Cox, so I ran a calc for your 36" d! ome port just to see... Looks like you could get away with one inch thick material for a 500' test depth. <br />Also - the calculator is designed for a full shell, so cut all the weight and buoyancy figures in half for a hemisphere.<br /><br />Sean<br /><br /><br /><img border="0" width="1064" height="744" id="_x0000_i1025" src="content://com.kaitenmail.attachmentprovider/a22c8ebf-aa51-421e-a5e2-d820b05e73ac/24/RAW" /><br /><br /><br />__________ Information from ESET NOD32 Antivirus, version of virus signature database 10722 (20141114) __________<br /><br />The message was checked by ESET NOD32 Antivirus.<br /><br /><a href="http://www.eset.com">http://www.eset.com</a></p><p></p><p class="MsoNormal"><span style="color:windowtext"><br /><br />__________ Information from
ESET NOD32 Antivirus, version of virus signature database 10722 (20141114) __________<br /><br />The message was checked by ESET NOD32 Antivirus.<br /><br /><a href="http://www.eset.com">http://www.eset.com</a><p></p></span></p><pre style="text-align:center"><hr size="2" width="100%" align="center" /></pre><pre><br />Personal_Submersibles mailing list<br /><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br /><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><p></p></pre></div><p class="MsoNormal"><span style="color:windowtext"><br /><br />__________ Information from ESET NOD32 Antivirus, version of virus signature database 10727 (20141114) __________<br /><br />The message was checked by ESET NOD32 Antivirus.<br /><br /><a href="http://www.eset.com">http://www.eset.com</a><p></p></span></p></div> <br /><br />__________ Information from ESET NOD32 Antivirus,
version of virus signature database 10730 (20141115) __________<br /><br />The message was checked by ESET NOD32 Antivirus.<br /><br /><a href="http://www.eset.com">http://www.eset.com</a><br /> <p style="margin-top: 2.5em; margin-bottom: 1em; border-bottom: 1px solid #000"></p><pre class="k9mail"><hr /><br />Personal_Submersibles mailing list<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 /></pre></blockquote></div></body></html>