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<div><font face="Arial, Helvetica, sans-serif" size="3" style="background-color: transparent;">Hi Alan,</font></div>
<div><font size="3"></font> </div>
<div><font size="3">If I understand the requirements correctly, then for designed maximum operating depths of 320 feet and the 340 feet respectively the test depths would be as follows:</font></div>
<div><font size="3">320' x 1.4 = 448' test depth</font></div>
<div><font size="3">340' x 1.25 = 425' test depth</font></div>
<div><font size="3"></font> </div>
<div><font face="Arial, Helvetica, sans-serif" size="3">And the designed collapse depths would be:</font></div>
<div><font size="3">320' x 2.4 = 768' collapse</font></div>
<div><font size="3">340' x 2.0 = 680' collapse</font></div>
<div><font size="3"></font> </div>
<div><font size="3">Therefore if my designed operating depth is near the lower limit <font face="Arial, Helvetica, sans-serif">of a bracket, increasing the stated operating depth enough to push it into a deeper bracket would actually <em>lessen</em> </font>the requirements for test depth and collapse. Do I understand correctly?</font></div>
<div><font size="3"></font> </div>
<div><font size="3">Thanks,</font></div>
<div><font size="3">Jim</font></div>
<div></div>
<div></div>
<div style="color: black; font-family: arial,helvetica; font-size: 10pt;">-----Original Message-----<br>
From: Alan James <alanlindsayjames@yahoo.com><br>
To: psubs.org <personal_submersibles@psubs.org><br>
Sent: Thu, Dec 5, 2013 9:27 pm<br>
Subject: [PSUBS-MAILIST] G.L. summary Design Loads<br>
<br>
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<div>This section is a summary of loads to be considered when</div>
<div>designing your submersible.</div>
<div>A load plan is to be submitted for the pressure hull, external loads</div>
<div>& internal loads. <span style="font-size: 14pt; background-color: transparent;">Section 4 F, table 4.2 has a summary of 35 relevant loads </span></div>
<div style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt; background-color: transparent;">& the tests </span><span style="font-size: 14pt; background-color: transparent;">required. The tightness tests (leak test by pulling a vacuum) are </span></div>
<div style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt; background-color: transparent;">at .2 bar </span><span style="font-size: 14pt; background-color: transparent;">below atmospheric pressure.</span></div>
<div>The relationship of the nominal diving pressure ( maximum operating depth )</div>
<div>the test pressure & collapse diving pressure, are dependent on the depth </div>
<div>you build for. For instance, down to a depth of 165 ft the test depth is 1.7</div>
<div>times operating depth, & the designed collapse depth should be 3.2 x the</div>
<div>maximum operating depth. <span style="font-size: 14pt;">Down to 330 ft it is 1.4 & 2.4 Down to 660 ft it is </span></div>
<div style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt;">1.25 & 2.</span></div>
<div style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt;">Section 4 F, table 4.2 has a summary of 35 relevant loads & the tests</span></div>
<div style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt;">required. The tightness tests (leak test by pulling a vacuum) are at .2 bar</span></div>
<div style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt;">below atmospheric pressure.</span></div>
<div style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt;">Alan</span></div>
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