<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1438717164661_10198"><span id="yui_3_16_0_1_1438717164661_10400">Scott,</span></div><div id="yui_3_16_0_1_1438717164661_10198" dir="ltr"><span id="yui_3_16_0_1_1438717164661_10401">this probably differs depending on the cerifying agency.</span></div><div id="yui_3_16_0_1_1438717164661_10198" dir="ltr"><span id="yui_3_16_0_1_1438717164661_10402">But I have seen the design depth to mean the crush depth. ie depth the sub is designed</span></div><div id="yui_3_16_0_1_1438717164661_10198" dir="ltr"><span id="yui_3_16_0_1_1438717164661_10429">to crush at. G.L. calls it CDP (collapse diving pressure) TDP (test diving pressure) & NDP</span></div><div id="yui_3_16_0_1_1438717164661_10198" dir="ltr"><span>(nominal diving pressure).</span></div><div id="yui_3_16_0_1_1438717164661_10198" dir="ltr"><span id="yui_3_16_0_1_1438717164661_10545">The test depth in relation to the operating depth differs depending on how deep you are</span></div><div id="yui_3_16_0_1_1438717164661_10198" dir="ltr"><span id="yui_3_16_0_1_1438717164661_10546">building for. If it is a shallow sub TDP is 1.7 x NDP. If deep, TDP is 1.2 x NDP.</span></div><div id="yui_3_16_0_1_1438717164661_10198" dir="ltr"><span>Also the relationship between CDP & NDP varies depending on your CDP.</span></div><div id="yui_3_16_0_1_1438717164661_10198" dir="ltr"><span>You do not operate at your test depth, just your nominal dive depth.</span></div><div id="yui_3_16_0_1_1438717164661_10198" dir="ltr"><span>G.L. Chapter 2 Section 4 C Design Loads.</span></div><div id="yui_3_16_0_1_1438717164661_10198" dir="ltr"><span>Cheers Alan</span></div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1438717164661_10549"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1438717164661_10548"> <div dir="ltr" id="yui_3_16_0_1_1438717164661_10547"> <hr size="1"> <font size="2" face="Arial" id="yui_3_16_0_1_1438717164661_10980"> <b><span style="font-weight:bold;">From:</span></b> via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Wednesday, August 5, 2015 4:13 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Specs question<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1438717164661_10981"><br><div id="yiv4362336949"><div id="yui_3_16_0_1_1438717164661_10984"><span style="font-family:Verdana;color:#000000;font-size:10pt;" id="yui_3_16_0_1_1438717164661_10983"><div id="yui_3_16_0_1_1438717164661_10982">Very good information! Thanks Sean! Does anyone know what the requirements are to keep a ABS certification current and what it costs?</div>
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<div id="yui_3_16_0_1_1438717164661_10985">Thanks,<br>Scott Waters </div>
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<blockquote id="yiv4362336949replyBlockquote" style="FONT-SIZE:10pt;FONT-FAMILY:verdana;COLOR:black;PADDING-LEFT:8px;MARGIN-LEFT:8px;BORDER-LEFT:blue 2px solid;">
<div id="yiv4362336949wmQuoteWrapper">-------- Original Message --------<br>Subject: Re: [PSUBS-MAILIST] Specs question<br>From: "Sean T. Stevenson via Personal_Submersibles"<br><<a rel="nofollow" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org" id="yui_3_16_0_1_1438717164661_10986">personal_submersibles@psubs.org</a>><br>Date: Tue, August 04, 2015 8:38 am<br>To: Personal Submersibles General Discussion<br><<a rel="nofollow" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org" id="yui_3_16_0_1_1438717164661_10987">personal_submersibles@psubs.org</a>><br><br>
<div dir="ltr">Design depth is the maximum permissible operating depth per design of the vessel, which will be some factor of safety smaller than the critical, or earliest anticipated failure depth. This is specified by the designer and drives the vessel design.</div>
<div dir="ltr">Operating depth can be equal to the design depth, or shallower, as it is typically the greatest depth within the design depth to which the vessel has been certified (tested in the presence of the surveyor). Operating depth may also be a de-rating of a previously certified depth for various reasons. PSubs obviously don't typically go through all of the certification procedure, but may be tested unmanned, in which case the successful test depth would constitute the operating depth.</div>
<div dir="ltr">Sean<br></div><br><br>
<div class="yiv4362336949gmail_quote">On August 4, 2015 10:00:02 AM CDT, via Personal_Submersibles <<a rel="nofollow" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
<blockquote class="yiv4362336949gmail_quote" style="PADDING-LEFT:1ex;MARGIN:0pt 0pt 0pt 0.8ex;BORDER-LEFT:rgb(204,204,204) 1px solid;"><span style="FONT-SIZE:10pt;FONT-FAMILY:Verdana;COLOR:#000000;">
<div>What is the difference between design depth and operational depth? How do you come up with those numbers?</div>
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<div>Thanks,</div>
<div>Scott Waters</div></span>
<div style="MARGIN-BOTTOM:1em;BORDER-BOTTOM:#000 1px solid;MARGIN-TOP:2.5em;"></div><pre class="yiv4362336949k9mail"><hr><br>Personal_Submersibles mailing list<br><a rel="nofollow" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a rel="nofollow" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></pre></blockquote></div>
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